Question

section 2.4 chemical reactions

1. which one of the following is a chemical change?

a. gasoline boils
c. gasoline burns
b. lead is added to gasoline
d. gasoline is poured into a tank

1. classify each of the following changes as physical or chemical.

a. dew is dried by the sun
c. grape juice is converted to wine
b. a dark cloth is faded by the sunlight
d. soap is dissolved in water

1. in the chemical reaction carbon dioxide plus water → carbonic acid, what does

the arrow stand for?

1. name the product(s) in problem 3.

1. name the reactant(s) in problem 3.

1. if 44 grams of carbon dioxide react completely with 18 grams of water, what is

the mass of carbonic acid formed?

1. in an engine, octane combines with oxygen to form carbon dioxide and water. if

22.8 grams of octane combine completely with 80 grams of oxygen to form 70.4
grams of carbon dioxide, what mass of water is formed?

1. what is the name of the chemical law on which problems 6 and 7 are based?

Explanation:

Answer:

1. c. gasoline burns
2. a. physical

b. chemical
c. chemical
d. physical

1. yields (or produces)
2. carbonic acid
3. carbon dioxide, water
4. 62 grams
5. 32.4 grams
6. Law of Conservation of Mass