1. Chemical and Physical Properties

2. Physical Properties Can be observed or measured without changing the composition of the substances in the material Can be observed or measured without changing the composition of the substances in the material Viscosity Viscosity Conductivity Conductivity Malleability Malleability Hardness Hardness Melting Point Melting Point Boiling Point Boiling Point Density Density

3. VISCOSITY

4. CONDUCTIVITY

9. Different boiling points solution Boiling Point  Celsius methanol65 ethanol78 2-propanol82 1-propanol97 water100 1-butanol117 1-pentanol138 1-hexanol158 1,2-ethandiol198 1,2,3-propanetriol290

11. Separating mixtures based on physical properties Filtration – process to separate materials based on the size of particles Filtration – process to separate materials based on the size of particles Filtration Distillation – process to separate substances based on their boiling points Distillation – process to separate substances based on their boiling points Distillation

12. Chemical Properties Flammability – ability to burn in presence of oxygen Flammability – ability to burn in presence of oxygen Reactivity – how readily a substance combines with other substances Reactivity – how readily a substance combines with other substances

15. Chemical and Physical Changes

16. Physical Changes Only changes physical properties, does not become a new substance. Only changes physical properties, does not become a new substance. –Phase changes (solid to liquid to gas) –Dissolving –Breaking

17. Chemical Changes When 1 or more substances form a new substance. When 1 or more substances form a new substance. Evidence: Evidence: –Production of a gas (not phase change) –Formation of a precipitate (a solid produced from a liquid) –Change in color –Change in temperature –Emission of light or odor

18. Classify each as physical or chemical changes Cutting a hole in your sweater. Cutting a hole in your sweater. Lighting a match Lighting a match Mixing sand with water. Mixing sand with water. Burning magnesium. Burning magnesium. Ripping a piece of paper Ripping a piece of paper Rust forming on a car Rust forming on a car

19. Conservation of Mass No matter what change occurs: No matter what change occurs: mass before = mass after mass before = mass after # of atoms before = # of atoms after