Pure Substances and Mixtures

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means.

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition with distinct phases.

Front

Is perfume a homogeneous or heterogeneous mixture?

Back

Perfume is a homogeneous mixture.

Front

What type of mixture is ocean water?

Back

Ocean water is a homogeneous mixture.

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

Can mixtures be separated?

Back

Yes, mixtures can be separated by physical methods such as filtration, distillation, or using a magnet.

Front

What method would you use to separate sand from iron filings?

Back

You would use a bar magnet to separate sand from iron filings.

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is saltwater.

Front

What is an example of a heterogeneous mixture?

Back

An example of a heterogeneous mixture is a salad.