Physical vs Chemical Change

Physical change or chemical change?

Replace this with a headeWhen two substances are put together in a container, one of three processes will probably occur:

They will either stay separated and not interact with each other,

They may mix together, or,

They may react with each other and form a new substance or substances.

The science of chemistry is all about investigating and predicting the possible changes that can occur when substances are placed together. Apart from nothing happening, the second option of a mixture forming is an example of a physical change, while reacting together to form new substances is a chemical change.

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When two substances are put together in a container, one of three processes will probably occur:

• They will either stay separated and not interact with each other,

• They may mix together, or,

• They may react with each other and form a new substance or substances.

The science of chemistry is all about investigating and predicting the possible changes that can occur when substances are placed together. Apart from nothing happening, the second option of a mixture forming is an example of a physical change, while reacting together to form new substances is a chemical change.

Physical change occurs when substances mix and either form a solution, a colloidal suspension or a mixture. The only difference between each is the size of the particles in the mixture.

Physical change - mixing

Multiple Choice

1. Which is NOT true of a mixture?

A. The original substances remain in the mixture.

B. Mixtures are usually easily separated.

C. Mixing is a physical change.

D. New substances are formed upon mixing.

• A

• B

• C

• D