Answer:
B. Shredding paper
Explanation:
A chemical change would change the actual chemical makeup of one substance from another. There are some signs of a chemical change that can be used to help determine if one has occurred. These include:
- a change in color
- a release of energy
- the creation of a precipitant
- a change in odor
- the release of a gas.
We can use process of elimination to go through the answers one by one:
When fireworks are lit on fire, they turn the powdered chemicals inside into visible light and a loud sound can be heard from them. So, the fireworks give off light and sound energy. This means this is a chemical change.
When we shred paper, the paper becomes smaller sizes, but chemically, the smaller pieces of paper are the same as the original sheet that they were shredded from. This means this is not a chemical change.
Burning off ethanol makes it a combustion reaction, which turns the chemical into carbon dioxide and water. This means that the products are not chemically the same as the original substance. This is a chemical change.
When we digest food, the enzymes in our bodies turn large molecules into smaller molecules. These smaller molecules are not the same as the larger molecules they were. This is a chemical change.
