Understanding Mixtures and Substances

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements like oxygen and compounds like water.

Front

Which of the following is a pure substance? Saltwater, Oxygen gas, Sand and iron filings, Lemonade?

Back

Oxygen gas is a pure substance.

Front

What is matter?

Back

Matter is anything that has mass and takes up space.

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, such as burning wood.

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, such as freezing water.

Front

What is density?

Back

Density is the mass of a substance divided by its volume, and it is independent of the amount of the sample.

Front

Which property is independent of the amount of the sample? Mass, Volume, Density, Weight?

Back

Density is independent of the amount of the sample.

Front

What is the difference between a mixture and a pure substance?

Back

A mixture contains two or more substances that are physically combined, while a pure substance has a uniform and definite composition.

Front

What is an example of a physical change?

Back

An example of a physical change is melting ice.

Front

What is an example of a chemical change?

Back

An example of a chemical change is rusting of iron.