Physical and Chemical Changes

Front

What is a chemical change?

Back

A chemical change is a process where a new substance is produced, involving a change in the chemical composition of the original substance.

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.

Front

Give an example of a chemical change.

Back

Examples of chemical changes include burning wood, rusting iron, and baking a cake.

Front

Give an example of a physical change.

Back

Examples of physical changes include melting ice, slicing bread, and breaking glass.

Front

What happens to the substance in a physical change?

Back

In a physical change, the substance remains the same at the molecular level, even though its appearance may change.

Front

What happens to the substance in a chemical change?

Back

In a chemical change, the original substance is transformed into one or more new substances with different properties.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

What is an indicator of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

Is breaking a glass a physical or chemical change?

Back

Breaking a glass is a physical change because the glass remains the same substance.

Front

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

Back

A physical change alters the form or appearance of a substance without changing its chemical identity, while a chemical change results in the formation of new substances.