What is the study of the properties of matter and how matter changes?

What is the force of attraction between two atoms?

Two or more substances that are together in the same place but are NOT chemically combined is a(n)

A pure substance made of two or more elements chemically combined in a set ratio is a(n)

A pure substance that cannot be broken down into any other substances is a(n)

The basic particle of a pure substance is a(n)

A group of two or more same atoms that are held together by chemical bonds is a(n)

Sort the examples according to what it is.

Sort the following.

One difference between mixtures and pure substances is that

Suppose you have a container filled with iron and sand.  How can you separate the iron from the sand?

What is sand and iron combined?

Water, H2O, is made up of different elements, hydrogen and oxygen. Is this type of combination a mixture or a pure substance?