Chapter 3 Key Terms

Question 1

Avogadro’s number

Answer 1

number of atoms/molecules in one mole

Question 2

combination reactions

Answer 2

two reactants combine to form one product

Question 3

combustion reactions

Answer 3

a substance, typically a hydrocarbon, reacts rapidly with O2 to form CO2 and H2O

Question 4

decomposition reactions

Answer 4

a single reactant forms two or more products

Question 5

elemental composition

Answer 5

percent composition of an element in a substance

Question 6

formula weight/molecular weight

Answer 6

sum of atomic weights of atoms in a molecule

Question 7

law of conservation of mass

Answer 7

the total mass of the products of a chemical reaction is the same as the total mass of the reactants

Question 8

limiting reactant

Answer 8

reactant completely consumed in a reaction

Question 9

molar mass

Answer 9

mass of one more of a substance in grams

Question 10

mole

Answer 10

collection of Avogadro’s number of atoms/molecules

Question 11

products

Answer 11

substance produced in a chemical reaction

Question 12

reactants

Answer 12

starting substance in a chemical reaction

Question 13

stoichiometry

Answer 13

study of quantitative relationships between chemical formulas and chemical equations

Question 14

theoretical yield

Answer 14

quantity of product potentially formed from limiting reactant