Chemical and Physical Changes

Front

What kind of change is baking a cake?

Back

Baking a cake is a chemical change because it involves a chemical reaction that transforms the ingredients into a new substance.

Front

What kind of change is exploding fireworks?

Back

Exploding fireworks is a chemical change because it involves a rapid chemical reaction that produces light, sound, and gas.

Front

What kind of change is a melting popsicle?

Back

A melting popsicle is a physical change because it changes from solid to liquid without altering its chemical composition.

Front

What kind of change is metal rusting?

Back

Metal rusting is a chemical change because it involves a reaction between metal and oxygen, resulting in a new substance (rust).

Front

What kind of change is crushing a soda can?

Back

Crushing a soda can is a physical change because it alters the shape and size of the can without changing its chemical composition.

Front

Define chemical change.

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

Front

Define 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

Give an example of a chemical change in cooking.

Back

An example of a chemical change in cooking is the process of frying an egg, where the proteins change structure.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules rearrange but do not change their chemical structure.

Front

What is an indicator of a chemical change?

Back

An indicator of a chemical change can include color change, temperature change, gas production, or the formation of a precipitate.