1. Atoms and Elements What is the difference?

2. Pure Substance Only one type of particle Can’t be separated by physical changes Examples: Pure WaterGold

3. Elements All particles have the same number of protons 1 type of particle All particles have identical properties Examples: Sulfur

4. Atoms Smallest particle of an element that has the same properties as the element Building block of all larger particles. Example: A Single Copper atom

5. Diatomic Elements These do not exist unbound in most situations Made entirely of gasses There are 7: H, N, O, F, Br, I, Cl

6. Compounds Made of two or more elements chemically bound to each other. Most things in our daily lives are made of compounds. Dry Ice (CO2)Ferrofluid

7. Ionic Compounds Usually will have a metal and nonmetal bonded to each other Usually dissolve easily in water Salt (NaCl)Potassium Chromate (KCrO 4 )

8. Molecules Usually are made of non-metals bonded to each other Most Chemicals in our body are made of molecules DNA (Deoxyribonucleic Acid) Enzyme

9. Compare and contrast Turn your paper over. Write a total of five characteristics of atoms, elements and compounds/molecules on the back of your sheet.