Introduction to the Text Web Notes

Homework from Text Complete section 7.1

Reading Strategy Preview the Key Concepts, Topic Headings, Vocabulary and figures in this first section. List two things you expect to learn. State what you have learned after reading the section. Read the section.

What I Expect to Learn Balance Equations Convert moles to mass What I Learned. How to balance an equation. Use of conversion factors

Describing Chemical Reactions Is the following sentence true or false. The new substances formed as a result of a chemical reaction are called products.

Chemical Equations Circle the letter of each correct sentence. A. Carbon and oxygen react to form carbon monoxide. B. Carbon and oxygen react to form carbon dioxide. C. Carbon dioxide yields carbon and oxygen. D. The reaction of carbon and oxygen yields carbon dioxide.

Chemical Equations Is the following true or false. The Law of Conservation of Mass states that mass is neither created or destroyed in a chemical reaction.

Chemical Equations Circle the letter of each correct sentence According to the equation C + 0 2 CO 2 How many carbon atoms react with 14 molecules of oxygen to form 14 molecules of carbon dioxide?

Chemical Equations Circle the letter of each correct sentence According to the equation C + 0 2 CO 2 How many carbon atoms react with 14 molecules of oxygen to form 14 molecules of carbon dioxide? A. 1 B. 7 C. 14 D. 28

Chemical Equations In the reaction represented by the equation C + 0 2 CO 2 the mass of the carbon dioxide produced equals

Balancing Chemical Equations Is the following sentence true or false. A chemical equation must be balanced in order to show that mass is conserved during a reaction.

Balancing Chemical Equations Circle the letter of the name given to the numbers that appear before formulas in a chemical equation.

Balancing Chemical Equations Circle the letter of the name given to the numbers that appear before formulas in a chemical equation. A. Subscripts B. Mass numbers C. Atomic numbers D. coefficients

Balancing Chemical Equations Is the following sentence true or false? Because the equation N 2 H 4 + 0 2 N 2 + H 2 O has two nitrogen atoms on each side, the equation is balanced?

Counting with Moles Chemists use a counting unit called a to measure amounts of substances because chemical reaction often involve large numbers of small particles.

Counting with Moles Circle the letter of each correct answer If one carbon atom has the an atomic mass of 12.0 amu and one oxygen atom has an atomic mass of 16.0 amu, what is the molar mass of carbon dioxide (CO 2 ) A. 28.0 amu B. 44.0 amu C. 28.0 g D. 44.0 g

Counting with Moles Circle the letter of the correct answer To convert grams of carbon dioxide to moles of carbon dioxide, you must multiply by which conversion factor? A. 44.0 g CO 2 /1 mole CO 2 B. 1 mole CO 2 /44.0 g CO 2 C 28.0 g CO 2 /1 mole CO 2 D. 1 mole CO 2 / 28.0 g CO 2

Formation of Water Equation 2H 2 0 2 2H 2 O Amount Molar Mass Mass Moles x Molar Mass 2 mol 1 mol 2.0 g/mol 32.0 g/mole 18.0 g/mol 36.0 g

Chemical Calculations. Circle the letter of the correct answer One mole of oxygen has a mass of 32.0 grams. What is the mass of four moles of oxygen? A. 128 grams B. 144 grams C. 128 amu D. 144 amu