Pick up a DENSITY WORKSHEET and quietly work on it. BELL WORK: Pick up a DENSITY WORKSHEET and quietly work on it.

Let’s Review Physical Properties… A physical property can be OBSERVED or MEASURED without changing its composition (how it’s made). Example: density, volume, color, smell, size, shape, mass, weight, strength, flexibility…

You use PHYSICAL PROPERTIES every single day… How?

Physical Changes… Physical changes do not form new substances. EXAMPLES: Freezing water Sanding a piece of wood Dissolving sugar in water Crushing a Coke can A popsicle melting Ripping a piece of paper

Chemical Properties… Chemical properties describe a substance’s ability to change into NEW matter. Chemical Properties: Flammability Reactivity

How do you tell a physical property from a chemical property? You can observe a physical property without changing the identity of the substance.

Chemical Changes: EXAMPLES: Soured milk Rusting nail Burning wood Chemical Changes happen when substances change into new substances AND have new properties. EXAMPLES: Soured milk Rusting nail Burning wood Frying an egg Baking a cake Fizzing soda

CHEAT SHEET! Signs of Chemical Changes: Change in color Change in odor Production of heat Fizzing and Foaming Sound being given off Light production Solid formation Bleach ruins your jeans. Milk sours and stinks. Light bulb gets hot. You open a can of Coke. Fireworks in the sky Glow stick at a concert Cake batter turns into cake.

Physical or Chemical? Chemical Chemical Physical

Physical or Chemical? Physical Chemical Chemical