Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into new substances with different properties, often involving a chemical reaction.

Front

What is a physical change?

Back

A physical change is a process that alters the form or appearance of a substance without changing its chemical composition.

Front

Give an example of a chemical change.

Back

An example of a chemical change is fireworks exploding, which involves a chemical reaction that produces light, sound, and new substances.

Front

Give an example of a physical change.

Back

An example of a physical change is cutting a pizza into slices, which changes its shape but not its chemical composition.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between atoms in molecules are broken and new bonds are formed, resulting in the creation of new substances.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but the molecules themselves remain the same and their chemical properties do not change.

Front

Is crushing a can a chemical or physical change?

Back

Crushing a can is a physical change because it alters the shape and size of the can 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 an indicator of a physical change?

Back

Indicators of a physical change include changes in state (solid, liquid, gas), shape, or size without any change in chemical composition.

Front

What is the difference between a reactant and a product in a chemical reaction?

Back

Reactants are the starting substances in a chemical reaction, while products are the new substances formed as a result of the reaction.