Physical and 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 boiling.

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 the rearrangement of atoms. Examples include rusting, burning, and baking.

Front

Is melting a chocolate bar a physical or chemical change?

Back

Melting a chocolate bar is a physical change.

Front

Is bending metal a physical or chemical change?

Back

Bending metal is a physical change.

Front

Is boiling water a physical or chemical change?

Back

Boiling water is a physical change.

Front

What is density?

Back

Density is a physical property defined as mass per unit volume of a substance.

Front

What happens when baking soda and vinegar are combined?

Back

When baking soda and vinegar are combined, a chemical change occurs, producing carbon dioxide gas.

Front

What are some examples of physical changes?

Back

Examples of physical changes include melting ice, dissolving sugar in water, and breaking a glass.

Front

What are some examples of chemical changes?

Back

Examples of chemical changes include burning wood, cooking an egg, and rusting iron.

Front

How can you identify a chemical change?

Back

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