Question

practice it!
select the option(s) that are examples of a physical change.
digesting food
a glacier melting
chewing food
a ball of slime being flattened
rusting pipe
mowing grass

Explanation:

• Digesting food involves chemical reactions (enzymes breaking down nutrients), so it's a chemical change.
• A glacier melting is a physical change (solid - liquid phase change without new substances).
• Chewing food is a physical change (mechanical breaking down without new substances).
• A ball of slime being flattened is a physical change (shape change without new substances).
• Rusting pipe is a chemical change (iron reacts with oxygen to form rust).
• Mowing grass is a physical change (mechanical cutting without new substances).

Answer:

B. a glacier melting, C. chewing food, D. a ball of slime being flattened, F. mowing grass