Physical vs Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and is usually irreversible. Examples include burning, rusting, and digestion.

Front

What is conductivity?

Back

Conductivity is the property of a material to conduct heat or electricity. Metals are typically good conductors.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes color change, temperature change, gas production, and the formation of a precipitate.

Front

Is mowing the lawn a physical or chemical change?

Back

Mowing the lawn is a physical change because it alters the appearance of the grass without changing its chemical composition.

Front

What happens to ice when it melts?

Back

When ice melts, it undergoes a physical change from solid to liquid, but its chemical composition (H2O) remains the same.

Front

What is an example of a chemical change?

Back

An example of a chemical change is wood burning, which produces ash and smoke and changes the wood into different substances.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in new substances being formed.

Front

What is an example of a physical change involving water?

Back

An example of a physical change involving water is water freezing into ice and then melting back into water.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide.