Question

Which of the following is considered a chemical change? Select all that apply.

A) crumpling a piece of paper into a ball
B) burning wood in a fireplace
C) digesting a delicious sandwich
D) crushing ice for soda

Answer 1

Burning wood in a fireplace and digesting a sandwich are considered chemical changes because they involve the formation of new substances, unlike crumpling a piece of paper or crushing ice, which are physical changes.

Step-by-step explanation:

Among the options provided, the processes that are considered chemical changes are:

• Burning wood in a fireplace, since it involves a chemical reaction that results in new substances forming (carbon dioxide and water).
• Digesting a sandwich, as this process breaks down the food into simpler molecules through chemical reactions in the body.

Other options like crumpling a piece of paper into a ball and crushing ice for soda are physical changes because they do not involve the formation of new substances, there's just a change in form or state.