1. ISAT Preparation Chemistry Atoms, Molecules, and Compounds

2. Vocabulary AtomMoleculeCompoundProtonNeutronElectronNucleus Chemical Formula

3. Chemistry Atom – smallest unit of matter Maintains the same properties of a pure substance Example – copper penny Molecules – atoms that are combined together make up molecules Ex. H 2 O, CO 2, H 2 O 2, CO, NO 2, N 2 O

4. Chemistry

5. Chemistry Compound is a pure substance made up of two or more atoms Bunch of the same molecules make up a compound Atoms are made up of sub-atomic particles that have their own properties

6. Chemistry

7. Chemistry Inside the nucleus – core of atom Proton – positive charge and has weight Neutron – neutral or no charge and has weight Outside the nucleus Electrons – negative charge and has no weight

8. Chemistry 1.What are atoms? 2.What is the difference between molecules and compounds? 3.What charge does a proton and an electron have? 4.Which of the following particles has no weight?

9. Chemistry Make Molecules Black – CarbonWhite – Hydrogen Red – OxygenBlue – Nitrogen A.H 2 OB. NH 3 C. CH 4 D. O 2 E. N 2 F. CH 3 OH G. H 2 O 2 H. C 2 H 4