Chemical and Physical 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 changes in state, shape, or size.

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.

Front

Give an example of a physical change.

Back

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

Front

Give an example of a chemical change.

Back

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

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules may change their arrangement or state, but their chemical structure remains the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the molecules undergo a chemical reaction, resulting in the formation of new substances with different properties.

Front

Is cutting a piece of paper a physical or chemical change?

Back

Cutting a piece of paper is a physical change because it alters the shape and size of the paper without changing its chemical composition.

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

What is rusting?

Back

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

Front

What is the difference between a reactant and a product?

Back

A reactant is a substance that undergoes a chemical change, while a product is a substance that is formed as a result of that change.