Question

Aria and Marcus attend a science LiveLesson. During the LiveLesson, the teacher explains that glucose is broken down in the body when it reacts with oxygen gas to form carbon dioxide and water. The teacher explains that the process actually occurs in several steps, but she shows them the following overall reaction and encourages them to think about the law of conservation of matter.

C 6
H 12
O 6
+ 6O 2
→ 6CO 2
+ some amount of H 2
O



a. There are 12 atoms of hydrogen shown on the reactant side. How many total atoms of hydrogen must be on the product side?

(1 point)
Responses

2
2

6
6

12
12

18
18
Question 2
b. What does the law of conservation of matter (or the law of conservation of mass) tell the students?(1 point)
Responses

Matter is always gained or lost in a chemical or physical process.
Matter is always gained or lost in a chemical or physical process.

Matter might be gained in a chemical or physical process.
Matter might be gained in a chemical or physical process.

Matter is never gained or lost in a chemical or physical process.
Matter is never gained or lost in a chemical or physical process.

Matter might be lost in a chemical or physical process

Answer 1

a. There are 12 atoms of hydrogen shown on the reactant side. Therefore, there must be **12** atoms of hydrogen on the product side.

**Response:** 12

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b. The law of conservation of matter (or the law of conservation of mass) tells the students that:

**Response:** Matter is never gained or lost in a chemical or physical process.