1. You will need 7 Index Cards
Vocabulary On-Level
You will need 7 Index Cards

2. CCGPS
S8P1. Students will examine the scientific view of the nature of matter.
a. Distinguish between atoms and molecules.
b. Describe the difference between pure substances (elements and compounds) and mixtures.

3. Atoms
An atom is a particle of matter that uniquely defines a chemical element.
An atom consists of a central nucleus that is usually surrounded by one or more electrons.
The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.

4. What is an atom?

5. Molecules
A Neutral Particle made of two or more atoms joined by chemical bonds.
Example – a molecule of water consists of oxygen chemically bonded to hydrogen.

6. Elements
A substance that cannot be separated into simpler substances by chemical means.

7. Compounds
A pure substance made of two or more elements chemically combined.
When elements are chemically combined into a compound, they have properties that are different from when they are not combined.

8. Elements and Compounds

9. Pure Substance
A substance that is made of only one type of atom or only one type of molecule.

10. Heterogeneous Mixtures
A heterogeneous mixture is made of different substances that remain physically separate. 
Heterogeneous mixtures always have more than one phase (regions with uniform composition and properties).
A mixture of sand and sugar is a heterogeneous mixture.
You can see the individual parts.

11. Homogeneous Mixtures
A mixture which has uniform composition and properties throughout.
Air is a homogeneous mixture of gases.
A teaspoonful of table salt stirred into a glass of water also makes a homogeneous mixture.
You can not see the individual parts.

12. Evaluate: Pure Substances and Mixtures