Chemical and Physical Changes Flashcard

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 melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves making or breaking bonds between atoms. Examples include baking, rusting, and burning.

Front

Can a physical change be reversed?

Back

Yes, many physical changes can be reversed. For example, melting ice can be refrozen into solid ice.

Front

Can a chemical change be reversed?

Back

Most chemical changes cannot be easily reversed. For example, baking a cake cannot be undone to get back the original ingredients.

Front

What happens to butter left outside on a hot day?

Back

It undergoes a physical change as it melts but can be solidified again when cooled.

Front

What is an example of a chemical change in cooking?

Back

Baking cupcakes is an example of a chemical change because the ingredients undergo a transformation to create a new substance.

Front

What happens to ice cubes when left at room temperature?

Back

They undergo a physical change and melt into water.

Front

What is the effect of heat on pudding mix?

Back

Heating pudding mix causes a chemical change, resulting in a new substance as it thickens and changes color.

Front

What happens to ice cream on a hot day?

Back

It undergoes a physical change and melts due to the heat.

Front

What is the difference between a physical and chemical change?

Back

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