Determining Average Atomic Mass

Size: px
Start display at page:

Download "Determining Average Atomic Mass"

Transcription

1 Chemistry Date: Name: Lab Table: 03.03c Determining Average Atomic Mass Lab Partner(s): Background Determining the average mass of an element uses the same method as determining the weighted average of your grade. For example: Category Percentage of Total Score Contribution to Total Grade (%/100) Contribution Tests Labs Quizzes Homework TOTAL SCORE: 82.5 Notice that although the percentage of each category is an integer, the total score has a decimal. Definition: The mass of an individual atom is measured in atomic mass units. By definition, 1 u is one-twelfth the mass of an unbound neutral atom of a carbon-12 atom. On the periodic table, the atomic mass for each element is the average atomic mass for all of the isotopes of that element. Task Although the mass of any individual atom is an integer, the atomic masses on a periodic table have decimals. For example, the atomic mass of a chlorine atom is u. Your task is to simulate how one calculates the average atomic mass, and to determine the average atomic mass of elements, and the relative abundance or mass of an individual isotope. Model Determining Average Atomic Mass for Copper. (A) Atomic Mass (B) (C) (B*C=D) Copper Copper Average Atomic Mass (sum of relative contributions): Check: The average atomic mass on the class periodic table is F:\ \330_ModChem\330_sections\330_03_Atoms_Hx\ c_Average_Atomic_Mass.docx (9/26/2014)

2 Chemistry Determining Average Atomic Mass p. 2 Procedure 1. Determination of Average Atomic Mass A. Count of the number of each atom of each isotope. (E.g., for a 0.5 of A, count out 50 A and measure the average mass for all 50 atoms. Atomic Mass (for one atom ) (A) (B) (C = A * B) A B C Average Atomic Mass: Calculate the average atomic masses for the following elements. Check your answer with a periodic table. B. Magnesium (symbol _Mg ) Atomic Mass Mg Mg-25 Mg Average Atomic Mass: (Check: Periodic Table: amu)

3 Chemistry Determining Average Atomic Mass p. 3 C. Molybdenum (symbol _Mo ) Atomic Mass Mo Mo Mo Mo Mo Mo Mo Average Atomic Mass: (Check: Periodic Table amu) D. Tin (symbol _Sn_) Mass Number Atomic Mass Average Atomic Mass: (Check: Periodic Table amu)

4 Chemistry 2. Determining s and Atomic Mass Units of Individual s. A. Calculate the atomic mass for gallium-71. Atomic Mass Gallium Gallium-71 (c) / = (a) = (b) = Total Average Atomic Mass: Show all work. (a) Calculate relative abundance by subtracting the known relative abundance from 1 (total relative abundance) (b) Ga-71 contribution = total (69.723) Ga-69 ( ) (c) Calculate Ga-71 atomic mass. B. The two of the three isotopes of silicon have atomic masses and percent abundances of amu ( %) and amu (4.6832%) What is the percentage abundance and atomic mass for silicon-30? (Show all work.) Atomic Mass (%) Silicon Silicon Silicon From Periodic Table, Average atomic mass: (a) is given, so in order to find Atomic Mass, need to know the Average Atomic Mass. Look it up on a periodic table (28.09 g/mol). (b) The sum of the s = 28.09; so solve for Si-30 Contribution. (c) Determine Atomic Mass for Si-30: (Atomic Mass) * ( ) =. Rearrange : Atomic Mass = ( contribution) / ( ) F:\ \330_ModChem\330_sections\330_03_Atoms_Hx\ c_Average_Atomic_Mass.docx (9/26/2014)

5 Chemistry Determining Average Atomic Mass p Extension Antimony has two naturally occurring isotopes. The mass of antimony-121 is amu and the mass of antimony-123 is amu. Using the average atomic mass from the periodic table, find the abundance of each isotope. Show all work.

The Atom Atomic Number Mass Number Isotopes

The Atom Atomic Number Mass Number Isotopes The Atom Atomic Number Mass Number Isotopes 1 Atomic Theory Atoms are building blocks of elements Similar atoms in each element Different from atoms of other elements Two or more different atoms bond in

More information

Chemistry CP Unit 2 Atomic Structure and Electron Configuration. Learning Targets (Your exam at the end of Unit 2 will assess the following:)

Chemistry CP Unit 2 Atomic Structure and Electron Configuration. Learning Targets (Your exam at the end of Unit 2 will assess the following:) Chemistry CP Unit 2 Atomic Structure and Electron Learning Targets (Your exam at the end of Unit 2 will assess the following:) 2. Atomic Structure and Electron 2-1. Give the one main contribution to the

More information

ATOMIC THEORY. Name Symbol Mass (approx.; kg) Charge

ATOMIC THEORY. Name Symbol Mass (approx.; kg) Charge ATOMIC THEORY The smallest component of an element that uniquely defines the identity of that element is called an atom. Individual atoms are extremely small. It would take about fifty million atoms in

More information

Name: Period: Date: Unit 3 Practice Review (the questions on the test are NOT the same as the review questions)

Name: Period: Date: Unit 3 Practice Review (the questions on the test are NOT the same as the review questions) Name: Period: Date: Unit 3 Review: things you will need to know 1. Atomic Theories: Know all the scientists in order. What did they discover? What experiment did they use? 2. Development of the periodic

More information

Name: Date: Pd: If we change the number of electrons it is called: loss of electron, gain of electron

Name: Date: Pd: If we change the number of electrons it is called: loss of electron, gain of electron Do Now: In this classroom there are 5 14 year olds, 12 15 year olds and 8- sixteen year olds. What is the average age of students in this classroom? How did you determine this? Isotopes Rewind: What is

More information

Isotopes. Are all atoms of an element alike? Isotopes of Hydrogen. Electron cloud Nucleus. Hydrogen-2 (deuterium) Isotopes of Carbon

Isotopes. Are all atoms of an element alike? Isotopes of Hydrogen. Electron cloud Nucleus. Hydrogen-2 (deuterium) Isotopes of Carbon Why? Isotopes Are all atoms of an element alike? The following activity will help you learn the important structural characteristics of an atom. How do we classify atoms? How does the combination of subatomic

More information

Matter. Atomic weight, Molecular weight and Mole

Matter. Atomic weight, Molecular weight and Mole Matter Atomic weight, Molecular weight and Mole Atomic Mass Unit Chemists of the nineteenth century realized that, in order to measure the mass of an atomic particle, it was useless to use the standard

More information

ATOMS A T O M S, I S O T O P E S, A N D I O N S. The Academic Support Center @ Daytona State College (Science 120, Page 1 of 39)

ATOMS A T O M S, I S O T O P E S, A N D I O N S. The Academic Support Center @ Daytona State College (Science 120, Page 1 of 39) ATOMS A T O M S, I S O T O P E S, A N D I O N S The Academic Support Center @ Daytona State College (Science 120, Page 1 of 39) THE ATOM All elements listed on the periodic table are made up of atoms.

More information

47374_04_p25-32.qxd 2/9/07 7:50 AM Page 25. 4 Atoms and Elements

47374_04_p25-32.qxd 2/9/07 7:50 AM Page 25. 4 Atoms and Elements 47374_04_p25-32.qxd 2/9/07 7:50 AM Page 25 4 Atoms and Elements 4.1 a. Cu b. Si c. K d. N e. Fe f. Ba g. Pb h. Sr 4.2 a. O b. Li c. S d. Al e. H f. Ne g. Sn h. Au 4.3 a. carbon b. chlorine c. iodine d.

More information

2 The Structure of Atoms

2 The Structure of Atoms CHAPTER 4 2 The Structure of Atoms SECTION Atoms KEY IDEAS As you read this section, keep these questions in mind: What do atoms of the same element have in common? What are isotopes? How is an element

More information

Name: Date: Period: Page: Average Atomic Mass Practice Answer Key. The Mass Spectrum of Zirconium

Name: Date: Period: Page: Average Atomic Mass Practice Answer Key. The Mass Spectrum of Zirconium Name: Date: Period: Page: Part I. Average Atomic Mass of Zirconium Average Atomic Mass Practice Answer Key A device known as a mass spectrometer can be used to determine the relative abundance of the isotopes

More information

ANSWER KEY : BUILD AN ATOM PART I: ATOM SCREEN Build an Atom simulation ( http://phet.colorado.edu/en/simulation/build an atom )

ANSWER KEY : BUILD AN ATOM PART I: ATOM SCREEN Build an Atom simulation ( http://phet.colorado.edu/en/simulation/build an atom ) ANSWER KEY : PART I: ATOM SCREEN Build an Atom simulation ( http://phet.colorado.edu/en/simulation/build an atom ) 1. Explore the Build an Atom simulation with your group. As you explore, talk about what

More information

UNIT (2) ATOMS AND ELEMENTS

UNIT (2) ATOMS AND ELEMENTS UNIT (2) ATOMS AND ELEMENTS 2.1 Elements An element is a fundamental substance that cannot be broken down by chemical means into simpler substances. Each element is represented by an abbreviation called

More information

Atomic Theory: The Nuclear Model of the Atom

Atomic Theory: The Nuclear Model of the Atom Chapter 5 Atomic Theory: The Nuclear Model of the Atom Section 5.1 Dalton s Atomic Theory Goal 1 Precursors to John Dalton s atomic theory Law of Definite Composition The percentage by mass of the elements

More information

Answers and Solutions to Text Problems

Answers and Solutions to Text Problems Atoms and Elements 2 Answers and Solutions to Text Problems 2.1 a. Cu b. Si c. K d. N e. Fe f. Ba g. Pb h. Sr 2.2 a. O b. Li c. S d. Al e. H f. Ne g. Sn h. Au 2.3 a. carbon b. chlorine c. iodine d. mercury

More information

Theories of Matter Composition

Theories of Matter Composition Chapter 2 Theories of Matter Composition Democritus (5 th 4 th century BC) ATOMISM Aristotle (4 th 5 th century BC) CONTINUOUS MATTER FOUR ELEMENTS Earth, Air, Fire, Water Boyle (17 th century) Reintroduced

More information

Chemical Composition Review Mole Calculations Percent Composition. Copyright Cengage Learning. All rights reserved. 8 1

Chemical Composition Review Mole Calculations Percent Composition. Copyright Cengage Learning. All rights reserved. 8 1 Chemical Composition Review Mole Calculations Percent Composition Copyright Cengage Learning. All rights reserved. 8 1 QUESTION Suppose you work in a hardware store and a customer wants to purchase 500

More information

Electron Configurations

Electron Configurations SECTION 4.3 Electron Configurations Bohr s model of the atom described the possible energy states of the electron in a hydrogen atom. The energy states were deduced from observations of hydrogen s emissionline

More information

02/27/14 Solution to the Assigned Problems of Workshop 2 Chem. 103, Spring 2014

02/27/14 Solution to the Assigned Problems of Workshop 2 Chem. 103, Spring 2014 Chapter 2: Atoms and the Periodic Table 02/27/14 Solution to the Assigned Problems of Workshop 2 Chem. 103, Spring 2014 Home-assigned problems (total of 15): 2.15, 2.17, 2.19, 2.21, 2.27, 2.29, 2.31, 2.37,

More information

1. Structure and Properties of the Atom

1. Structure and Properties of the Atom 1. Structure and Properties of the Atom 1.1 Atoms: A simple definition of the atom is that it is the smallest particle that contains the properties of that element. The idea of atoms was first suggested

More information

2.5 The Modern View of Atomic Structure: An Introduction

2.5 The Modern View of Atomic Structure: An Introduction 2.5 The Modern View of Atomic Structure: An Introduction Figure 2.13 a & b (a) Expected Results of the Metal Foil Experiment if Thomson's Model Were Correct (b) Actual Results Copyright Houghton Mifflin

More information

Periodic Table & Atomic Structure

Periodic Table & Atomic Structure St Peter the Apostle High School Chemistry Department Periodic Table & Atomic Structure N4 & N5 Homework Questions Answer questions as directed by your teacher. National 4 level questions are first followed

More information

Atomic Mass/Molar Mass, Percent Composition, & Empirical and Molecular Formula

Atomic Mass/Molar Mass, Percent Composition, & Empirical and Molecular Formula Name AP Chemistry Atomic Mass/Molar Mass, Percent Composition, & Empirical and Molecular Formula Atomic Mass/Molar Mass The mass for an element reported on the Periodic Table is the average mass of all

More information

Atomic Theory Part 1

Atomic Theory Part 1 Atomic Theory Part 1 Reading: Ch 2 sections 1 6, 8 Homework: Chapter 2: 39, 47, 43, 49, 51*, 53, 55, 57, 71, 73, 77, 99, 103 (optional) * = important homework question The Atomic Theory (John Dalton, 1803)

More information

Print your name. NAID number

Print your name. NAID number October 18, 2001 Chemistry 117 Exam 1 Print your name. NAID number Important Instructions: This exam consists of multiple parts. For the multiple choice component follow the instructions below. 1) Use

More information

The Periodic Table: Chapter Problems Periodic Table Class Work Homework Special Groups Class Work Homework Periodic Families Class Work

The Periodic Table: Chapter Problems Periodic Table Class Work Homework Special Groups Class Work Homework Periodic Families Class Work The Periodic Table: Chapter Problems Periodic Table 1. As you move from left to right across the periodic table, how does atomic number change? 2. What element is located in period 3, group 13? 3. What

More information

1. Structure and Properties of the Atom

1. Structure and Properties of the Atom SACE Stage 1 Chemistry - The Essentials 1. Structure and Properties of the Atom 1.1 Atoms: A simple definition of the atom is that it is the smallest particle that contains the properties of that element.

More information

Chapter 2 Atoms, Ions, and the Periodic Table

Chapter 2 Atoms, Ions, and the Periodic Table Chapter 2 Atoms, Ions, and the Periodic Table 2.1 (a) neutron; (b) law of conservation of mass; (c) proton; (d) main-group element; (e) relative atomic mass; (f) mass number; (g) isotope; (h) cation; (i)

More information

Chapter 2 Atoms and the Periodic Table

Chapter 2 Atoms and the Periodic Table Chapter 2 1 Chapter 2 Atoms and the Periodic Table Solutions to In-Chapter Problems 2.1 Each element is identified by a one- or two-letter symbol. Use the periodic table to find the symbol for each element.

More information

Periodic Table Packet #1

Periodic Table Packet #1 Directions: Answer the questions with the proper information using your notes, book, and the periodic table. 1. Define a family. 2. What is a period? 3. What is the symbol for the following elements. a.

More information

Chapter 7. Bellringer. Table of Contents. Chapter 7. Chapter 7. Objectives. Avogadro s Number and the Mole. Chapter 7. Chapter 7

Chapter 7. Bellringer. Table of Contents. Chapter 7. Chapter 7. Objectives. Avogadro s Number and the Mole. Chapter 7. Chapter 7 The Mole and Chemical Table of Contents Chemical Formulas Bellringer List as many common counting units as you can. Determine how many groups of each unit in your list are present in each of the following

More information

Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.

Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. Introduction to Chemistry Exam 2 Practice Problems 1 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1.Atoms consist principally of what three

More information

SYMBOLS, FORMULAS AND MOLAR MASSES

SYMBOLS, FORMULAS AND MOLAR MASSES SYMBOLS, FORMULAS AND MOLAR MASSES OBJECTIVES 1. To correctly write and interpret chemical formulas 2. To calculate molecular weights from chemical formulas 3. To calculate moles from grams using chemical

More information

Name: Class: Date: ID: A

Name: Class: Date: ID: A Name: Class: Date: ID: A Chapter 5 Assessment Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Mendeleev arranged the elements in his periodic table in

More information

Unit 2: Atomic Theory Practice Packet

Unit 2: Atomic Theory Practice Packet Unit 2: Atomic Theory Practice Packet 1 Name History of Atomic Theory Period Fill in the missing information in the chart below: Name of Researcher Equipment Sketch of Model Major Idea/Discovery N/A All

More information

MOLECULAR MASS AND FORMULA MASS

MOLECULAR MASS AND FORMULA MASS 1 MOLECULAR MASS AND FORMULA MASS Molecular mass = sum of the atomic weights of all atoms in the molecule. Formula mass = sum of the atomic weights of all atoms in the formula unit. 2 MOLECULAR MASS AND

More information

Review - Atomic Structure

Review - Atomic Structure Name: Tuesday, June 03, 2008 Review - Atomic Structure 1. The number of neutrons in the nucleus of an atom can be determined by 1. adding the atomic number to the mass number 3. adding the mass number

More information

3. What would you predict for the intensity and binding energy for the 3p orbital for that of sulfur?

3. What would you predict for the intensity and binding energy for the 3p orbital for that of sulfur? PSI AP Chemistry Periodic Trends MC Review Name Periodic Law and the Quantum Model Use the PES spectrum of Phosphorus below to answer questions 1-3. 1. Which peak corresponds to the 1s orbital? (A) 1.06

More information

IPS Unit 8 Periodic Table Review Worksheet

IPS Unit 8 Periodic Table Review Worksheet Name: Period: IPS Unit 8 Periodic Table Review Worksheet Directions: Use the terms below to correctly complete the statements. Write the terms in the blanks to the left. Then find and circle each term

More information

What Is in an Atom? Visual Concept: Parts of the Atom. Atomic Number and Mass Number. What Is in an Atom?, continued

What Is in an Atom? Visual Concept: Parts of the Atom. Atomic Number and Mass Number. What Is in an Atom?, continued What Is in an Atom? Visual Concept: Parts of the Atom What is the difference between protons, neutrons, and electrons? The three main subatomic particles are distinguished by mass, charge, and location

More information

Exam 2 SOLUTION You may tear off the last page to use as scratch paper. Useful conversion factors are available on the last page.

Exam 2 SOLUTION You may tear off the last page to use as scratch paper. Useful conversion factors are available on the last page. Name Exam 2 SOLUTION You may tear off the last page to use as scratch paper. Useful conversion factors are available on the last page. Problem Solving Answer the following questions in the spaces provided.

More information

Sample Questions in multiple choice format.

Sample Questions in multiple choice format. Sample Questions in multiple choice format. 1. Which among the following statements is false? A) A solid has a definite shape and a definite volume. B) A liquid has a definite volume; but it has no definite

More information

Percent Composition - Formulas

Percent Composition - Formulas Percent Composition - Formulas This program demonstrates how to find percentage composition as well as empirical and molecular formulas from that data. Please read each section carefully. You might wish

More information

Formulas, Equations, and Moles. + "reacts with" "to produce" Equations must be balanced. Equal amounts of each element on each side of the equation.

Formulas, Equations, and Moles. + reacts with to produce Equations must be balanced. Equal amounts of each element on each side of the equation. Chapter 3 Formulas, Equations, and Moles Chemical Equations 2 2 + 2 2 2 reactants products + "reacts with" "to produce" coefficients - indicate amount of substance Equations must be balanced. Equal amounts

More information

Average or Apparent Mass of an Element

Average or Apparent Mass of an Element elearning 2009 Introduction Publication No. 91770 Average or Apparent Mass of an Element Isotopes and Atomic Mass At the beginning of the 19th century, John Dalton proposed his new atomic theory all atoms

More information

Untitled Document. 1. Which of the following best describes an atom? 4. Which statement best describes the density of an atom s nucleus?

Untitled Document. 1. Which of the following best describes an atom? 4. Which statement best describes the density of an atom s nucleus? Name: Date: 1. Which of the following best describes an atom? A. protons and electrons grouped together in a random pattern B. protons and electrons grouped together in an alternating pattern C. a core

More information

4. Magnesium has three natural isotopes with the following masses and natural abundances:

4. Magnesium has three natural isotopes with the following masses and natural abundances: Exercise #1 Atomic Masses 1. The average mass of pennies minted after 1982 is 2.50 g and the average mass of pennies minted before 1982 is 3.00 g. In a sample that contains 90.0% new and 10.0% old pennies,

More information

Name PRE-TEST. Directions: Circle the letter indicating whether the following statements are either true ("T") or false ("F").

Name PRE-TEST. Directions: Circle the letter indicating whether the following statements are either true (T) or false (F). 1 PRETEST Directions: Circle the letter indicating whether the following statements are either true ("T") or false ("F"). T F 1. Chemical elements with similar chemical properties are referred to as a

More information

PERIODIC TABLE OF GROUPS OF ELEMENTS Elements can be classified using two different schemes.

PERIODIC TABLE OF GROUPS OF ELEMENTS Elements can be classified using two different schemes. 1 PERIODIC TABLE OF GROUPS OF ELEMENTS Elements can be classified using two different schemes. Metal Nonmetal Scheme (based on physical properties) Metals - most elements are metals - elements on left

More information

4. How does the stability of an isotope relate to its abundance in nature? Why might this be the case?

4. How does the stability of an isotope relate to its abundance in nature? Why might this be the case? Isotopes and Atomic Mass: Modeling Relative Atomic Mass Name Go to the University of Colorado Boulder PhET website at http://phet.colorado.edu Click Play with Sims Seek and click on Chemistry on the left-hand

More information

CHEM 1180 Fall 2015 Element Quiz A 28 AUG 15. Guard your quiz and conduct yourself properly. Spelling counts!

CHEM 1180 Fall 2015 Element Quiz A 28 AUG 15. Guard your quiz and conduct yourself properly. Spelling counts! CHEM 1180 Fall 2015 Element Quiz A 28 AUG 15 a) Chromium Cr b) Lithium Li c) Thallium Tl d) Tellurium Te e) Cadmium Cd f) Vanadium V g) Titanium Ti h) Sulfur S i) Silicon Si j) Beryllium Be a) Mn Manganese

More information

CHEM 101/105 Numbers and mass / Counting and weighing Lect-03

CHEM 101/105 Numbers and mass / Counting and weighing Lect-03 CHEM 101/105 Numbers and mass / Counting and weighing Lect-03 Interpretation of Elemental Chemical Symbols, Chemical Formulas, and Chemical Equations Interpretation of an element's chemical symbol depends

More information

The Nature of Chemistry

The Nature of Chemistry CHAPTER 1 The Nature of Chemistry Objectives You will be able to do the following. 1. Describe how science in general is done. 2. Given a description of a property of a substance, identify the property

More information

Use the PES spectrum of Phosphorus below to answer questions 1-3.

Use the PES spectrum of Phosphorus below to answer questions 1-3. Use the PES spectrum of Phosphorus below to answer questions 1-3. 1. Which peak corresponds to the 1s orbital? (A) 1.06 (B) 1.95 (C) 13.5 (D) 18.7 (E) 208 2. Which peak corresponds to the valence 3p orbital?

More information

Chapter 3 Atoms and Elements

Chapter 3 Atoms and Elements Chapter 3 Atoms and Elements 1 Elements Elements are pure substances that cannot be separated into simpler substances by ordinary laboratory processes the building blocks of matter listed on the inside

More information

The Components of Matter. 1. Development of atomic structure. 2. Atomic number and atomic mass. 5. Atoms and moles. 6. The periodic table

The Components of Matter. 1. Development of atomic structure. 2. Atomic number and atomic mass. 5. Atoms and moles. 6. The periodic table Chapter 2 The Components of Matter 1. Development of atomic structure 2. Atomic number and atomic mass 3. Isotopes 4. Atomic weight 5. Atoms and moles 6. The periodic table 2.7 & 2.8 is not required. General

More information

What is a MOLE? January 13, 2010

What is a MOLE? January 13, 2010 What is a MOLE? January 13, 2010 Unit 5 MOLES MOLE = A unit used in chemistry to identify a quantity of a substance. (Can be done by individual count or by mass.) Mole Preparation lab: new words were introduced

More information

ATOMS AND THE PERIODIC TABLE CHAPTER 3 PHYSICAL SCIENCE

ATOMS AND THE PERIODIC TABLE CHAPTER 3 PHYSICAL SCIENCE ATOMS AND THE PERIODIC TABLE CHAPTER 3 PHYSICAL SCIENCE Chapter 3 Vocabulary Words (27 words) Nucleus Atomic number Proton Mass number Neutron Isotopes Electron Atomic mass unit (amu) Energy level Average

More information

Atomic mass and the mole

Atomic mass and the mole Atomic mass and the mole An equation for a chemical reaction can provide us with a lot of useful information. It tells us what the reactants and the products are in the reaction, and it also tells us the

More information

Chapter 2. Atoms and Elements

Chapter 2. Atoms and Elements Chapter 2. Atoms and Elements John Dalton Robert Millikan J.J. Thomson Ernest Rutherford The Components of Matter Elements, Compounds, Mixtures Dalton s Atomic Theory Modern Atomic Theory Atomic and Mass

More information

Chapter 2 Atoms, Molecules, and Ions

Chapter 2 Atoms, Molecules, and Ions Chapter 2 Atoms, Molecules, and Ions 1 Self study: The history of the development of atomic theory. 9 th Ed: pp. 36-41 or 10 th Ed: pp. 38-42. 2 The Atomic Theory of Matter John Dalton (1766-1844), began

More information

Lecture 5 Outline. Derived from the Greek stoicheion ( element ) and metron ( measure )

Lecture 5 Outline. Derived from the Greek stoicheion ( element ) and metron ( measure ) Lecture 5 Outline 5.1 Stoichiometry,, the mole etc. 5.2 Chemical Equations 5.3 Molarity 5.4 Limiting reagents and yields 5.5 Reaction enthalpies and Gibbs free energy 5.6 Catalyst Lecture 5 Stoichiometry

More information

Chapter 3 Atoms & the. Chapter 3 Section 2 The Simplest Matter Pages 80-85

Chapter 3 Atoms & the. Chapter 3 Section 2 The Simplest Matter Pages 80-85 Chapter 3 Atoms & the Periodic Table Chapter 3 Section 2 The Simplest Matter Pages 80-85 The Elements There are many different types of atoms. An element is matter made up of only one kind of atom. An

More information

Lithium Atomic number: 3 Atomic weight: 7 State of matter: solid Protons: 3 Neutrons (usually): 4 Electrons: 3 Number of electron shells:

Lithium Atomic number: 3 Atomic weight: 7 State of matter: solid Protons: 3 Neutrons (usually): 4 Electrons: 3 Number of electron shells: Hydrogen Atomic number: 1 Atomic weight: 1 Protons: 1 Neutrons (usually): 0 Electrons: 1 H Helium Atomic number: 2 Atomic weight: 4 Protons: 2 Neutrons (usually): 2 Electrons: 2 He Lithium Atomic number:

More information

Chapter 1: Moles and equations. Learning outcomes. you should be able to:

Chapter 1: Moles and equations. Learning outcomes. you should be able to: Chapter 1: Moles and equations 1 Learning outcomes you should be able to: define and use the terms: relative atomic mass, isotopic mass and formula mass based on the 12 C scale perform calculations, including

More information

The Mole IT IS JUST A STANDARD NUMBER OF ATOMS/MOLECULES

The Mole IT IS JUST A STANDARD NUMBER OF ATOMS/MOLECULES The Mole S 6.02 X 10 23 IT IS JUST A STANDARD NUMBER OF ATOMS/MOLECULES Relative Masses To understand relative scales, let s s ignore electrons and compare atoms by total number of nuclear particles. Hydrogen,

More information

Introduction to Chemistry

Introduction to Chemistry 1 Copyright ç 1996 Richard Hochstim. All rights reserved. Terms of use. Introduction to Chemistry In Chemistry the word weight is commonly used in place of the more proper term mass. 1.1 Atoms, Ions, and

More information

Useful only for measuring the mass of very small objects atoms and molecules!

Useful only for measuring the mass of very small objects atoms and molecules! Chapter 9 Chemical Composition (Moles) Which weighs more, 1 atom of He or 1 atom of O? Units of mass: Pound Kilogram Atomic mass unit (AMU) There are others! 1 amu = 1.66 x 10-24 grams = mass of a proton

More information

MOLES AND MOLE CALCULATIONS

MOLES AND MOLE CALCULATIONS 35 MOLES ND MOLE CLCULTIONS INTRODUCTION The purpose of this section is to present some methods for calculating both how much of each reactant is used in a chemical reaction, and how much of each product

More information

Practice questions for Ch. 3

Practice questions for Ch. 3 Name: Class: Date: ID: A Practice questions for Ch. 3 1. A hypothetical element consists of two isotopes of masses 69.95 amu and 71.95 amu with abundances of 25.7% and 74.3%, respectively. What is the

More information

2014 Spring CHEM101 Ch1-2 Review Worksheet Modified by Dr. Cheng-Yu Lai,

2014 Spring CHEM101 Ch1-2 Review Worksheet Modified by Dr. Cheng-Yu Lai, Ch1 1) Which of the following underlined items is not an intensive property? A) A chemical reaction requires 3.00 g of oxygen. B) The density of helium at 25 C is 1.64 10-4 g/cm3. C) The melting point

More information

Period 3 elements

Period 3 elements 3.1.4.2 Period 3 elements 173 minutes 169 marks Page 1 of 17 Q1. (a) Explain why certain elements in the Periodic Table are classified as p-block elements. Illustrate your answer with an example of a p-block

More information

Chapter 3: Stoichiometry

Chapter 3: Stoichiometry Chapter 3: Stoichiometry Goal is to understand and become proficient at working with: 1. Avogadro's Number, molar mass and converting between mass and moles (REVIEW). 2. empirical formulas from analysis.

More information

Lecture 3: (Lec3A) Atomic Theory

Lecture 3: (Lec3A) Atomic Theory Lecture 3: (Lec3A) Atomic Theory Mass of Atoms Sections (Zumdahl 6 th Edition) 3.1-3.4 The Concept of the Mole Outline: The mass of a mole of atoms and the mass of a mole of molecules The composition of

More information

Name: Class: Date: Chapter 4 & 5 Review

Name: Class: Date: Chapter 4 & 5 Review Name: Class: Date: Chapter 4 & 5 Review 1. Unlike Democritus, Aristotle did not believe that matter was composed of tiny, indivisible. 2. The results of Rutherford s gold foil experiment demonstrated that

More information

Lecture 4 - Observations that Led to the Nuclear Model of the Atom. Chem 103, Section F0F Unit I - An Overview of Chemistry Lecture 4

Lecture 4 - Observations that Led to the Nuclear Model of the Atom. Chem 103, Section F0F Unit I - An Overview of Chemistry Lecture 4 Chem 103, Section F0F Unit I - An Overview of Chemistry Lecture 4 Some observations that led to the nuclear model for the structure of the atom The modern view of the atomic structure and the elements

More information

Chapter 9. Slide 1. Slide 2. Slide 3. Chemical Quantities. Table of Contents

Chapter 9. Slide 1. Slide 2. Slide 3. Chemical Quantities. Table of Contents 1 Chapter 9 Chemical Quantities 2 Chapter 9 Table of Contents 9.1 Information Given by Chemical Equations 9.2 9.3 Copyright Cengage Learning. All rights reserved 2 3 Section 9.1 Information Given by Chemical

More information

Atomic Structure Practice Test

Atomic Structure Practice Test Atomic Structure Practice Test Multiple Choice Identify the choice that best completes the statement or answers the question. 1. If 6.0 g of element K combine with 17 g of element L, how many grams of

More information

APPENDIX B: EXERCISES

APPENDIX B: EXERCISES BUILDING CHEMISTRY LABORATORY SESSIONS APPENDIX B: EXERCISES Molecular mass, the mole, and mass percent Relative atomic and molecular mass Relative atomic mass (A r ) is a constant that expresses the ratio

More information

B) atomic number C) both the solid and the liquid phase D) Au C) Sn, Si, C A) metal C) O, S, Se C) In D) tin D) methane D) bismuth B) Group 2 metal

B) atomic number C) both the solid and the liquid phase D) Au C) Sn, Si, C A) metal C) O, S, Se C) In D) tin D) methane D) bismuth B) Group 2 metal 1. The elements on the Periodic Table are arranged in order of increasing A) atomic mass B) atomic number C) molar mass D) oxidation number 2. Which list of elements consists of a metal, a metalloid, and

More information

ATOMIC STRUCTURE AND THE PERIODIC TABLE

ATOMIC STRUCTURE AND THE PERIODIC TABLE 5 ATOMIC STRUCTURE AND THE PERIODIC TABLE Conceptual Curriculum Concrete concepts More abstract concepts or math/problem-solving Standard Curriculum Core content Extension topics Honors Curriculum Core

More information

The Mole Concept and Atoms

The Mole Concept and Atoms Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 4 24 September 2013 Calculations and the Chemical Equation The Mole Concept and Atoms Atoms are exceedingly

More information

Chemistry Stoichiometry. 45 points. Do not turn page until told to do so.

Chemistry Stoichiometry. 45 points. Do not turn page until told to do so. Chemistry 2010 Stoichiometry 45 points Do not turn page until told to do so. Stoichiometry Multiple Choice (Each worth 2 points) Identify the letter of the choice that best completes the statement or

More information

Study Guide For Chapter 7

Study Guide For Chapter 7 Name: Class: Date: ID: A Study Guide For Chapter 7 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. The number of atoms in a mole of any pure substance

More information

Chapter Two Study Guide Answers

Chapter Two Study Guide Answers Chapter Two Study Guide Answers Concepts 1. Know the law of conservation of mass 2. Know about the structure of the atom and who did what including Thomson, Rutheford, Millikan, Bohr 3. Know the three

More information

Review Topic 3: Elements, Radioactivity, and the Periodic Table

Review Topic 3: Elements, Radioactivity, and the Periodic Table Name: Score: 19 / 19 points (100%) Review Topic 3: Elements, Radioactivity, and the Periodic Table Multiple Choice Identify the choice that best completes the statement or answers the question. 1. The

More information

Unit 2 Atomic Structure

Unit 2 Atomic Structure Unit 2 Atomic Structure Big Idea: Atomic structure explains patterns in the behavior of elements and allows us to predict the chemical and physical behavior of a given element. The organization of elements

More information

PSI AP Chemistry Unit 1 MC Homework. Laws of Multiple and Definite Proportions and Conservation of Mass

PSI AP Chemistry Unit 1 MC Homework. Laws of Multiple and Definite Proportions and Conservation of Mass PSI AP Chemistry Unit 1 MC Homework Name Laws of Multiple and Definite Proportions and Conservation of Mass 1. Dalton's atomic theory explained the observation that the percentage by mass of the elements

More information

ICI. The periodic table Notes for teachers

ICI. The periodic table Notes for teachers Ages 11-14 and 14-16 Notes for teachers Contents The interactive periodic table is an extensive database of element properties. The data is displayed instantaneously as you roll over each element. Besides

More information

Atoms, Molecules, Formulas, and Subatomic Particles

Atoms, Molecules, Formulas, and Subatomic Particles Introduction to Chemistry Chapter 5 1 Atoms, Molecules, Formulas, and Subatomic Particles The Atom: The smallest particle of an element that can exist and still have the properties of the element building

More information

Type: Single Date: Kinetic Theory of Gases. Homework: Read (14.1), Do CONCEPT Q. # (1), Do PROBLEMS # (2, 3, 5) Ch. 14

Type: Single Date: Kinetic Theory of Gases. Homework: Read (14.1), Do CONCEPT Q. # (1), Do PROBLEMS # (2, 3, 5) Ch. 14 Type: Single Date: Objective: Kinetic Theory of Gases Homework: Read (14.1), Do CONCEPT Q. # (1), Do PROBLEMS # (2, 3, 5) Ch. 14 AP Physics Mr. Mirro Kinetic Theory of Gases Date Unlike the condensed phases

More information

ATOMS AND THE PERIODIC TABLE

ATOMS AND THE PERIODIC TABLE ATOMS AND THE PERIODIC TABLE Physical Science 2nd Semester NAME: CLASS PERIOD: TEACHER: ASSIGNMENT/PAGE NUMBERS DUE DATE POINTS EARNED Periodic Table of Elements pg. 1 Atomic Structure Learning Targets

More information

Instructors Guide: Atoms and Their Isotopes

Instructors Guide: Atoms and Their Isotopes Instructors Guide: Atoms and Their Isotopes Standards Connections Connections to NSTA Standards for Science Teacher Preparation C.3.a.1 Fundamental structures of atoms and molecules. C.3.b.27 Applications

More information

2 Atomic structure and the periodic table

2 Atomic structure and the periodic table Page 35 Questions 1 a) Isotopes have the same number of protons but a different number of neutrons. Therefore, B and D are isotopes of element number 17 (chlorine). B is a 35 Cl atom and D is a 37 Cl +

More information

Chemistry 100 Exam 1

Chemistry 100 Exam 1 Instructor: Nicole Stevens 1 of 8 Winter 2008 1. Which of the following is a chemical property? a. density d. boiling point b. color e. odor c. reactivity with water f. all of these are chemical properties

More information

Chapter Five: Atomic Theory and Structure

Chapter Five: Atomic Theory and Structure Chapter Five: Atomic Theory and Structure Evolution of Atomic Theory The ancient Greek scientist Democritus is often credited with developing the idea of the atom Democritus proposed that matter was, on

More information

AP Chemistry Prep - Summer Assignment 2013

AP Chemistry Prep - Summer Assignment 2013 AP Chemistry Prep - Summer Assignment 2013 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which value has only 4 significant digits? a. 6.930 c. 8450

More information

Chapter 4: Atoms and Elements

Chapter 4: Atoms and Elements C h e m i s t r y 1 2 C h 4 : A t o m s a n d E l e m e n t s P a g e 1 Chapter 4: Atoms and Elements Bonus Problems: 27, 29, 33, 35, 45, 51, 53, 67, 69, 73, 83, 87, 93, 95, 107, 109 Early Ideas on Matter:

More information

2/4/14. What does the percent composition of a compound tell you?

2/4/14. What does the percent composition of a compound tell you? 103 Percent Composition 103 Percent Composition CHEMISTRY & YOU Chapter 10 Chemical Quantities 101 The Mole: A Measurement of Matter 10 Mole-Mass and Mole-Volume Relationships 103 Percent Composition and

More information

0.1553(54.W»V Q.S^l(3b.9ldp) ' $>- A b a i NAME. Average Atomic Mass Worksheet: show all work.

0.1553(54.W»V Q.S^l(3b.9ldp) ' $>- A b a i NAME. Average Atomic Mass Worksheet: show all work. NAME Average Atomic Mass Worksheet: show all work. 1) Rubidium is a soft, silvery-white metal that has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is

More information