Question

use with textbook pages 202 - 211.
chemical equations
match the term on the left with the best descriptor on the right. each descriptor may be used only once.

1. product
2. reactant
3. coefficient
4. word equation
5. skeleton equation
6. chemical reaction
7. chemical equation

a. a chemical that reacts in a chemical reaction
b. a chemical that forms in a chemical reaction
c. a chemical change in which new substances are formed
d. a chemical equation that is written using chemical names
e. an integer placed in front of a formula in a chemical equation
f. a chemical equation that is written using chemical formulas
g. a set of chemical formulas that identify the reactants and products in a chemical reaction

1. which of following describes the law of conservation of mass?

i. the mass is conserved in a chemical reaction.
ii. the total mass of the products is equal to the total mass of the reactants in a chemical reaction.
iii. the total number of each kind of atom at the start of the reaction is equal to the total number of each kind of atom after the reaction.
a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii, and iii

Explanation:

• I: The law of conservation of mass states that mass is conserved in a chemical reaction.
• II: It also means the total mass of products equals the total mass of reactants.
• III: Since mass is made up of atoms, the total number of each kind of atom before and after the reaction is equal.

Answer:

D. I, II, and III