Chemical and Physical changes 5th grade

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance but does not alter its chemical composition. Examples include changes in state (like melting or freezing), 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. Examples include rusting, burning, and cooking.

Front

Can physical changes be reversed?

Back

Yes, physical changes can often be reversed. For example, ice can melt into water and then freeze back into ice.

Front

Can chemical changes be reversed?

Back

Chemical changes are usually not reversible by simple physical means. For example, burning wood creates ash and gases that cannot be turned back into wood.

Front

What is an example of a physical change?

Back

Tearing paper is an example of a physical change because it alters the shape and size of the paper but does not change its chemical composition.

Front

What is an example of a chemical change?

Back

Making slime is an example of a chemical change because it involves a chemical reaction between the ingredients that creates a new substance.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules may change their arrangement or state (solid, liquid, gas) 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 molecules with different chemical structures.

Front

What is rusting an example of?

Back

Rusting is an example of a chemical change because it involves the reaction of iron with oxygen in the presence of moisture to form iron oxide.

Front

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

Back

The main difference is that a physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.