END OF COURSE CHEMISTRY

Transcription

1 VIRINI STNRS O LERNIN Spring 2009 Released Test EN O OURSE EMISTRY orm S0119, ORE 1 Property of the Virginia epartment of Education 2009 by the ommonwealth of Virginia, epartment of Education, P.O. ox 2120, Richmond, Virginia ll rights reserved. Except as permitted by law, this material may not be reproduced or used in any form or by any means, electronic or mechanical, including photocopying or recording, or by any information storage or retrieval system, without written permission from the copyright owner. ommonwealth of Virginia public school educators may reproduce any portion of these released tests for non-commercial educational purposes without requesting permission. ll others should direct their written requests to the Virginia epartment of Education, ivision of Student ssessment and School Improvement, at the above address or by to Student_ssessment@doe.virginia.gov.

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3 hemistry irections Read each question and choose the best answer. SMPLE Which of the following is a balanced equation? + r 2r r r r 2r r 2 r 3

4 1 Which of these would be best to measure 12.6 ml of liquid ethanol? 25 ml beaker 25 ml volumetric flask 25 ml Erlenmeyer flask 25 ml graduated cylinder 2 Potassium (K) has a smaller atomic mass than argon (r) even though the atomic number of potassium is larger than the atomic number of argon. Which of the following best accounts for this observation? t STP, potassium is in the solid phase, but argon is a gas. It is easier for a potassium atom to lose an electron than it is for an argon atom. The most common isotopes of argon have more protons than the most common isotopes of potassium. The most common isotopes of potassium have fewer neutrons than the most common isotopes of argon. 4

5 3 Which of the following is the correct Lewis electron-dot diagram for the sodium atom? Na Na Na Na 4 compound has a mass of g/mol. The number of significant figures in this mass is

6 5? e O? O? e? O 2 What are the coefficients of the correctly balanced equation? 1, 3, 2, 3 0, 2, 2, 3 1, 2, 2, 2 2, 6, 4, 3 6 The correct formula for dinitrogen pentoxide is NO 2 5 NO 5 NO 5 NO 2 7 When ionic compounds are named, the name of a monatomic anion will end in which of the following suffixes? -ic -ite -ate -ide 6

7 8 When 1 g of sodium chloride (Nal) is placed in 100 g of water, a solution results. Once the solution is prepared, water is now considered what part of the solution? Solid Liquid Solute Solvent 9 What is the name of the compound with the formula Pl 5? Phosphorus(I) chloride Phosphorus(V) chlorine Phosphorus pentachlorate Phosphorus pentachloride 10 ow many electrons does the iron ion have when it forms the ionic compound el 3?

8 11 ovalent bonds mainly occur between two nonmetallic elements two metallic elements one metallic element and one nonmetallic element one metalloid and one metallic element 12 ml What is the volume of the water in this graduated cylinder? 4.39 ml 4.41 ml 4.55 ml 5.61 ml 8

9 13 If substance X is a liquid, substance Y is a gas, and substance Z is a solid, and all are at the same temperature and pressure, then the order of increasing strength of their intermolecular forces would be X < Y < Z Y < X < Z Z < Y < X Y < Z < X 14 If a sample has a mass of g and a volume of 51 ml, what is its density? g/ml g/ml 2.5 g/ml 250 g/ml 15 What is the empirical formula of the compound with the molecular formula 6 12?

10 16 = Water molecule The diagram shows water molecules in an open beaker and water molecules that have evaporated into the air above the beaker. Which change in this system will increase the rate of evaporation? dding salt to the water Increasing the temperature of the water Increasing the pressure of the air above the water Increasing the humidity of the air above the water 17 chemist is examining an unidentified element sample with oxidation states of + 2, + 3,and + 6. The element has a shielding effect similar to that of potassium (K). Which statement about the unidentified element is most likely true? It has the same number of neutrons as potassium. It is a transition metal from the same period as potassium. It is one of the heaviest elements in potassium s group. It is a mix of three unstable isotopes of potassium. 10

11 18 2N 3(g) N 2(g) + 3 2(g) The reaction for the decomposition of ammonia (N 3) can be written as shown. If a student starts with 21.7 g of N 3, how many grams of hydrogen ( 2) gas will be produced by the reaction? 1.28 g 2.55 g 3.85 g 32.5 g 19 The product in a balanced reaction is 4l 2 O 3. Which of the following shows the number of aluminum and oxygen atoms in l O? atoms of aluminum and 3 atoms of oxygen 6 atoms of aluminum and 3 atoms of oxygen 8 atoms of aluminum and 12 atoms of oxygen 6 atoms of aluminum and 7 atoms of oxygen 11

12 attery acid Lemon juice pple juice lack coffee Pure water ntacid aking soda and soap rain cleaner ousehold ammonia ccording to the p scale, which substance is slightly acidic? attery acid lack coffee aking soda rain cleaner 21 Which of these is most likely to form between elements transferring electrons to form oppositely charged particles? metallic bond hydrogen bond covalent bond n ionic bond 12

13 22 Which of the following is a chemical change? Salt is dissolved in water. Water is boiled on a stove. asoline combusts in an engine. opper metal is stretched into a long wire. 23 The table shows the specific heat capacity of four substances. Substance eat apacity g luminum lass arbon dioxide Water or an equal mass of each substance, which one will require the least amount of heat to raise its temperature from 20 to 30? luminum lass arbon dioxide Water 13

14 24 What is the volume occupied by 51.0 g of ammonia (N ) gas at STP? L 22.8 L 67.2 L 91.9 L 3 25 Molar eat of usion and Melting Point for Selected Substances Substance rgon enzene Mercury Water Melting Point ( ) Δ fus (k/mol) Which substance will release the greatest amount of heat when 1.00 mol is frozen? rgon enzene Mercury Water 14

15 26 student hypothesizes that bromine (r) has different chemical properties from krypton (Kr). The periodic table supports this hypothesis by indicating that bromine is a metal while krypton is a nonmetal one mole of bromine is heavier than one mole of krypton bromine and krypton are members of the same family bromine and krypton have different numbers of valence electrons 27 mixture of gases with a pressure of 800 mm g contains 10% oxygen and 90% nitrogen by volume. What is the partial pressure of the oxygen gas in the mixture? 10 mm g 80 mm g 700 mm g 800 mm g 15

16 28 Which graph best shows the relationship between the volume of a gas and its temperature as the gas pressure remains constant? Volume (ml) Volume (ml) Temperature (K) Temperature (K) Volume (ml) Volume (ml) Temperature (K) Temperature (K) 29 One example of an ionic compound is 2 O 2 r Mgl 2 16

17 30 Material Safety ata Sheet Product Identification hemical Q azard Identification aker S-T T TM Ratings ealth: 2 Moderate lammability: 3 Severe Reactivity: 1 Slight ontact: 1 Slight azard ratings are 0 to 4 (0 = no hazard, 4 = extreme hazard). Lab Protective Equipment: oggles and shield, lab coat and apron, vent hood, proper gloves, class extinguisher ccidental Spill Instructions: Ventilate area containing the spill. bsorb the chemical with inert material (vermiculite, sand) and place in proper chemical waste container. o not place or pour down the drains. bottle of chemical Q spills on the floor. ccording to the MSS, what is the proper response to this accident? Letting the chemical evaporate by blowing fans on the spill iluting the chemical with water, absorbing the liquid with inert material, and disposing of it in the trash Wiping up the chemical using paper towels and disposing of them in the trash bsorbing the chemical with inert material and disposing of it in a chemical waste container 17

18 31 Le hatelier s principle describes what happens to a system in equilibrium when a stress occurs. ll of the following could shift an equilibrium EXEPT changing the pressure on the system changing the temperature of the system changing the identity of the catalyst changing the concentration of one of the components 32 Zn(s) + 2l(aq) Znl (aq) + (g) 2 2 What type of reaction is shown? Precipitation Neutralization Single replacement ouble replacement 18

19 33 ydrogen chloride is a covalent compound. Which is a correct Lewis dot structure for l? l l l l 34 Which is the best use for a fume hood? Storing glassware Removing toxic vapors overing volatile compounds Mixing chemicals that release O 2 35 Which of the following equations is balanced? Na+ 2l 2Nal 2 2Na + l 2 Nal 2 Na+ l 2 2Nal 2Na+ l 2Nal 2 19

20 36 The specific heat of aluminum is ow much heat is required to g i. raise the temperature of a 30.0 g block of aluminum from to 75. 0? O O When an electric current is passed through water, the reaction shown takes place. If the arrow were pointing in the opposite direction, what type of reaction would the new reaction represent? Single-replacement ouble-replacement Synthesis ecomposition 20

21 38 Small Periodic Table Section X 4 The picture shows a small section of elements from the periodic table. Which element has one more proton than element X? O O + 2 O If 1.0 mole of methane reacts with oxygen to produce carbon dioxide and water, what mass of water is produced? 16 grams 18 grams 36 grams 44 grams 21

22 40 n example of a chemical property is mass of a substance per unit volume ability to dissolve in solution point where solid becomes liquid tendency to undergo oxidation 41 Students want to separate and compare the components of black ink and green ink. Which technique is the best for the students to use? hromatography ecanting iltration Evaporation 42 When 80 g of sodium hydroxide, NaO, are dissolved in enough water to make 500 ml of solution, the molarity of the solution is 1 M 2 M 4 M 8 M 22

23 43 What is the name for the compound aso? 4 alcium sulfate alcium sulfide alcium sulfur oxide alcium sulfur oxygen 44 If the p of a solution is 4, what is the po?

24 45 student attempts to measure the specific heat capacity of an unknown liquid through repeated trials. She measures its specific heat capacity, in as 2.14, 2.11, 2.13, 2.12, and The specific heat capacity of the g i, liquid should be recorded as 2 g i g i g i g i 24

25 46 Phase iagram for ompound X Pressure (kpa) M N Temperature (º) If the temperature changes from point M to point N, at constant pressure, compound X undergoes one phase change two phase changes three phase changes no change in phase 47 Which of these best describes the basis on which new scientific ideas are accepted or rejected? Popular support istorical support ompelling evidence Moral and ethical beliefs 25

26 48 ased on its position in the periodic table, the element sulfur would be expected to have how many valence electrons? The number of molecules in 48.0 grams of oxygen gas ( ) is O 2 50 student determined that the density of a sample of tin is 8.00 g/ml, when the actual density of tin is 7.28 g/ml. What was the percent error in the student s calculation? 0.72% 9.0% 9.9% 91% 26

27 nswer Key-EO015-S0119 Test Sequence Number orrect nswer Reporting ategory Reporting ategory escription Scientific Investigation tomic Structure and Periodic Relationships Nomenclature, hemical ormulas, and Reactions Scientific Investigation Nomenclature, hemical ormulas, and Reactions Nomenclature, hemical ormulas, and Reactions Nomenclature, hemical ormulas, and Reactions Molar Relationships Nomenclature, hemical ormulas, and Reactions tomic Structure and Periodic Relationships Nomenclature, hemical ormulas, and Reactions Scientific Investigation Phases of Matter and Kinetic Molecular Theory Scientific Investigation Nomenclature, hemical ormulas, and Reactions Phases of Matter and Kinetic Molecular Theory tomic Structure and Periodic Relationships Molar Relationships Nomenclature, hemical ormulas, and Reactions Molar Relationships Nomenclature, hemical ormulas, and Reactions tomic Structure and Periodic Relationships Phases of Matter and Kinetic Molecular Theory Molar Relationships Phases of Matter and Kinetic Molecular Theory tomic Structure and Periodic Relationships Phases of Matter and Kinetic Molecular Theory Phases of Matter and Kinetic Molecular Theory Nomenclature, hemical ormulas, and Reactions Scientific Investigation Nomenclature, hemical ormulas, and Reactions Nomenclature, hemical ormulas, and Reactions Nomenclature, hemical ormulas, and Reactions Scientific Investigation Nomenclature, hemical ormulas, and Reactions Phases of Matter and Kinetic Molecular Theory Nomenclature, hemical ormulas, and Reactions tomic Structure and Periodic Relationships Molar Relationships tomic Structure and Periodic Relationships Scientific Investigation Molar Relationships Nomenclature, hemical ormulas, and Reactions Molar Relationships Scientific Investigation Phases of Matter and Kinetic Molecular Theory Scientific Investigation tomic Structure and Periodic Relationships Molar Relationships Scientific Investigation

28 hemistry, ore 1 If you get this many items correct: Then your converted scale score is:

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