1. Chemistry Unit By Jalen Gayle 707 Science 4/15/12

2. Matter What is matter ? Matter is a physical substance and occupies space.

3. States of Matter One state of matter is Solid. Inside of a solid the particles do not move they stay together. For example, a wood block, steel block, a book, stick, suit case. Another state of matter is liquid. Inside of a liquid the particles move around but still near each other. For example, water, grape juice, orange juice, hot chocolate, Lucozade. The last state of matter is gas. The particles in a gas roam around freely. For example, oxygen, carbon dioxide, nitrogen.

4. Physical Change Physical changes are changes affecting the form of a chemical substance, but do not change the chemical composition of that substance. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds. Examples of a physical change is chewing food, smashing nuts, and making a salad.

5. Chemical Change Chemical changes occur when a substance combines with another to form a new substance. These processes are called chemical reactions, and in general, are not reversible except by further chemical reactions. Examples of a chemical change is digesting food, making salt.

6. What is an Atom Atoms are the basic building blocks of matter that make up everyday objects. Examples of different atoms are: A desk The air Human beings - even we are made up of atoms!

7. Elements An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing a single proton and a single electron. If you change the number of protons an atom has, you change the type of element it is. For example, Iron, Hydrogen.

8. Compound A compound is made up of two or more types of elements (e.g. water and carbon dioxide) that are chemically combined in a set ratio. They cannot be broken down into two or more simpler substances by physical means, only by chemical means.

9. Periodic Table

10. Periodic table is what scientists use to find the elements.

11. Substances & Mixtures Chemical substance, a material with a definite chemical composition Mixtures you can see the items you use to mix together and that does not happen in substances.

12. Heterogeneous & Homogenous Homogeneity and heterogeneity are concepts relating to the uniformity or lack thereof in a substance. A material that is homogeneous is uniform in composition or character; one that is heterogeneous lacks uniformity in one of these qualities. A substance that is uniform in composition is a definition of homogeneous. This is in contrast to a substance that is heterogeneous. The definition of homogeneous strongly depends on the context used.

13. Solutions A solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solvent does the dissolving. The solution more or less takes on the characteristics of the solvent including its phase, and the solvent is commonly the major fraction of the mixture.

14. Solubility What is Solubility? Solubility is the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a solid, liquid, or gaseous solvent to form a homogeneous solution of the solute in the solvent.