5.P.2.3

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.

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.

Front

What happens during rusting?

Back

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

Front

What is an example of a chemical change?

Back

Frying an egg is an example of a chemical change because it results in new substances being formed.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change because it changes from solid to liquid without forming a new substance.

Front

What indicates a chemical change has occurred?

Back

The formation of gas, a change in color, or the production of heat are indicators of a chemical change.

Front

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

Back

A chemical change results in new substances, while a physical change does not change the substance's chemical identity.

Front

What is an example of a substance undergoing a physical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered.

Front

What is the significance of a gas forming during a reaction?

Back

The formation of gas during a reaction often indicates that a chemical change has occurred.

Front

What does it mean when a substance does not form a new substance?

Back

It means that the change is physical, not chemical, as the original substance remains unchanged at the molecular level.