JDES 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 folding paper, melting ice, or breaking glass.

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 burning wood, rusting iron, or baking a cake.

Front

How can you separate a mixture of water, sugar, and sand?

Back

You can heat the mixture to evaporate the water, leaving behind sugar and sand.

Front

What happens to metal when it rusts?

Back

Rusting is a chemical change where iron reacts with oxygen and moisture in the air to form iron oxide, commonly known as rust.

Front

What is soot?

Back

Soot is a black powdery substance that is produced when wood or other organic materials burn. It is a result of incomplete combustion.

Front

What is evaporation?

Back

Evaporation is the process by which liquid water turns into vapor or gas, usually when heated.

Front

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

Back

A physical change does not create new substances and can often be reversed, while a chemical change creates new substances and usually cannot be reversed.

Front

What is an example of a physical change?

Back

Folding a piece of paper is an example of a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.

Front

How can corks and bolts be separated?

Back

Corks and bolts can be separated by adding water to the mixture, as corks will float while bolts will sink.