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Presentation transcript:

Review

What are 3 physical properties of water? Colorless Odorless Liquid at room temp. Density of 1.00 g/mL Freezes at 0°C Boils at 100°C

Two objects both about the same size as an orange Which has the greater density?

Physical Changes

Physical Change a change of matter from one form to another without changing its identity

Examples of physical changes… freezing

Examples of physical changes… Cutting

Examples of physical changes… Crushing/Bending

Examples of physical changes… Dissolving

Examples of physical changes… Melting

Examples of physical changes… Breaking

With physical changes… The shape or appearance may change but it is still the same thing

How can I change the physical properties of…

How can I change the physical properties of…

How can I change the physical properties of…

Chemical Properties

How would you describe a piece of wood before and after it is burned?

Chemical properties describe a substance’s ability to change into new matter with new properties

Examples: Flammability

Examples: Reactivity Iron reacts with oxygen to form rust Bumper is coated with chromium that is nonreactive with oxygen

How do you tell a physical property from a chemical property? Chemical properties are more difficult to see. Can be observed only when a chemical change might happen

A substance always has its chemical properties You can see that wood is flammable only while it is burning You can see that gold is nonflammable only when it is non burning A substance always has its chemical properties

What are some chemical properties of water? Nonflammability Highly reactive to many metals http://www.youtube.com/watch?v=92Mfric7JUc&feature=related