Question

1. in it seems like matter is lost during a chemical reaction?

a.
b. matter turns into energy
c. some matter becomes a gas and spreads into the air
d. scientists make mistakes when measuring

1. the conservation of mass means that *

a. new matter is created in reactions
b. matter can be destroyed
c. matter changes color but not weight
d. matter is not created or destroyed during reactions

Explanation:

For question 4: The appearance of mass loss often happens when a product of a chemical reaction is a gas that escapes into the air, making it seem like mass is lost even though it is just transferred.
For question 5: The law of conservation of mass states that in a closed system, the total mass of reactants equals the total mass of products, meaning matter is neither created nor destroyed in a chemical reaction.

Answer:

1. C. some matter becomes a gas and spreads into the air
2. D. Matter is not created or destroyed during reactions