#1. which statement is a correct expression of the law of conservation of mass? a. the total mass is unpredictable in a chemical reaction. b. the total mass remains the same during a chemical reaction. c. the total mass decreases during a chemical reaction. d. the total mass increases in a chemical reaction. #2. which element(s) are not balanced in this equation?
fe2o3 + 3 co → fe + 3 co2
a.
only the fe is unbalanced.
b.
only the o is unbalanced
c.
fe and o are both unbalanced.
d.
c and o are both unbalanced
Answers: 2
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