Question

which of these is an example of a chemical change? feeling ice melt on your skin smelling sprayed perfume leaving cheese out to get moldy crushing ice with a hammer

Explanation:

Step1: Define chemical change

A chemical change results in a new substance with different properties.

Step2: Analyze ice - melting

Ice - melting is a physical change as water changes from solid to liquid without a new substance formed.

Step3: Analyze smelling perfume

Smelling perfume is a physical process of perfume molecules spreading in air, no new substance is formed.

Step4: Analyze cheese getting moldy

When cheese gets moldy, new substances (mold and its by - products) are formed due to chemical reactions with microorganisms, so it's a chemical change.

Step5: Analyze crushing ice

Crushing ice is a physical change as it only changes the physical form (size and shape) of ice, not its chemical composition.

Answer:

leaving cheese out to get moldy