Generation Genius: Physical & 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 changing its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

Give an example of a physical change.

Back

Melting ice is an example of a physical change.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change.

Front

What happens to the gas during a physical change?

Back

The same gas is present before and after the change.

Front

What gas do candles need to stay lit?

Back

Candles need oxygen to stay lit.

Front

What happens to a candle when it burns?

Back

When a candle burns, it undergoes a chemical change.

Front

What is the result of hydrogen in a flame test?

Back

Hydrogen makes a 'pop' sound in a flame test.

Front

What is left after gallium melts?

Back

A puddle of gallium metal is left after gallium melts.

Front

What is the role of carbon dioxide when candles go out?

Back

Carbon dioxide is produced when candles burn, and it can cause the flame to go out.