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.
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
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