Question

select all the examples of a chemical change.
□ ice melting
□ nail rusting
□ bread baking
□ wood burning
□ milk spoiling

Explanation:

Step1: Recall chemical change definition

A chemical change involves a new substance formation, while physical change is a state/shape change without new substances.

Step2: Analyze each option

• Ice melting: Physical (state change, no new substance).
• Nail rusting: Chemical (Fe reacts with O₂/H₂O to form rust, new substance).
• Bread baking: Chemical (yeast acts, starches/sugars change, new substances).
• Wood burning: Chemical (combustion, CO₂, ash, new substances).
• Milk spoiling: Chemical (bacteria ferment lactose, new substances like lactic acid).

Answer:

The examples of chemical change are:

• nail rusting
• bread baking
• wood burning
• milk spoiling

(Note: Ice melting is a physical change, so it's not selected.)