1. Matter Study Guide www.middleschoolscience.comwww.middleschoolscience.com 2008 1

2. Anything that has a mass and a volume 2

3. Close up views of atoms and their behaviors Animated images are from http://www.chem.purdue.edu/gchelp/http://www.chem.purdue.edu/gchelp/ 3

4. Changing from one state to another is a Physical Change. A change in shape is also a physical change. If a new substance is formed it is a Chemical Change. Images are from http://www.chem4kids.com 4

5. After a physical change, the original substance still exists. After a chemical change, the original substance no longer exists, but new substance does. The atoms have re-bonded! Images are from http://www.chem4kids.com 5

6. The building block of Matter Consists of Protons (+), Electrons (-), and Neutrons (N). Consists of only one kind of atom, Cannot be broken down into a simpler type of matter by either physical or chemical means Can exist as either free atoms or molecules. Images are from http://www.chem4kids.com 6

7. A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together. In the animation above, two nitrogen atoms (N + N = N2) made one nitrogen molecule. 7

8. Animated images and notes from http://www.chem.purdue.edu/gchelp/atoms/elements.htmlhttp://www.chem.purdue.edu/gchelp/atoms/elements.html Atoms of two or more different elements bound together. Can be separated into elements chemically, but not physically. In the animation above, water (H 2 O) is a compound made of Hydrogen and Oxygen. 8

9. A solution is a group of molecules that are mixed up in a completely even distribution. Uniform Distribution. Example: Sugar and Water Images are from http://www.chem4kids.com 9

10. The substance to be dissolved. The one doing the dissolving. Images are from http://www.chem4kids.com 10

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12. Solutions are homogeneous mixtures. Solutions are CLEAR. There are also two other types of mixtures— colloids and suspensions. Images are from http://www.chem4kids.com 12

13. Particle sizes are in between the size of particles found in solutions and suspensions. Can be mixed and remain evenly distributed without settling out. Colloids are CLOUDY, but still homogeneous. 13

14. Suspensions are heterogeneous mixtures consisting of parts that are visible to the naked eye. Examples: the ingredients in salad dressing Substances will settle over time. 14

15. All mixtures are substances held together by physical forces, not chemical. Can be separated physically. Unlike homogeneous mixtures, the substances are not uniformly mixed. Example: Sand in a glass of water. Images are from http://www.chem4kids.com 15

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