Physical Properties – Can be observed or measured without changing the identity of the substance.

Physical Properties –

Can be observed or measured without changing the identity of the substance

Physical Properties Examples:

1. color2. odor3. phase 4. Density5. heat or electric

conductor6. Hardness7. Boiling and Melting

points8. Streak test

What are some physical properties of mercury ?

Chemical Properties-

Describe a substance’s ability to react chemically with other substances.

Chemical Properties examples:

Reactivity – ex. sodium metal reacts with water

Chemical Property

Combustibility (flammability)

Physical vs. Chemical Changes

Physical Change -

A change in the physical properties, but does not change the identity of the substance

Examples:

Cutting woodIs it still wood?

Example: Change in state

All three are still H2O

Chemical change -

When two or more substances (reactants), combine to form a new substance (the product)

Signs that a chemical change occurred.

new product is formed

heat or smoke produced

Bubbles produced

Example : Burning items

Example : baking cake

Example: Rust

tarnish

Law of conservation of Mass

Matter (mass) cannot be created nor destroyed during a chemical change.

Mass of Reactants = Mass of Products

Water + alka seltzer = water +sodium citrate + carbon dioxide

Physical Properties – Can be observed or measured without changing the identity of the substance.

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Transcript of Physical Properties – Can be observed or measured without changing the identity of the substance.

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