2. Element – a substance that cannot be broken down into simpler substance by chemical means. Atom – the smallest unit of an element that still has all of the properties of that element.

3. Compound – two or more atoms of different elements that are chemically bound together. Molecule – the smallest unit of a compound that has all of the properties of that compound.

4. pure substance is a kind of matter that cannot be separated into other kinds of matter by any physical process. An example of a pure substance is water. Mixture – a combination of 2 or more substances that are NOT chemically bonded.

5. Mixtures Homogeneous Mixtures which are the same throughout with identical properties everywhere in the mixture. Not easily separated. An example of this would be salt water. Heterogeneous Mixtures which have different properties when sampled from different areas. Examples of this would be sand mixed with water or peanuts mixed with raisins.

6. Alloy – a mixture of metals For example, 14K gold