1. Matter & Its Properties

2. Journal 5- Test Quiz Review
Express 6234 in scientific notation
3.0L is equal to:
30 kL b) 300 mL c) 3000 mL
3) 4.5 x x 104
4) What is the formula for % error?
5) You calculated the density of Gold to be 2.5 g/ml and the true density is 3.0 g/ml:
a) Calculate your error b) Calculate your % error.

3. Matter
All matter has mass and takes up space

4. Matter But it may be made of particles we can’t see.
Atoms- smallest unit of an element that maintains the chemical identity of the element.
Element- a pure substance that can’t be broken into simpler forms, made of 1 type of atom.
Compound- can be broken down, made from two or more atoms that are chemically bonded together.

5. States Of Matter Solid Liquid Gas definite volume and definite shape
Atoms tightly packed together
Liquid
definite volume but an indefinite shape
Atoms further apart- less dense
Gas
Indefinite volume and indefinite shape
Atoms in motion- furthest apart/least dense
*Plasma
high-temperature physical state of matter in which atoms lose most of their electrons, particles that make up atoms

6. Vapor vs. Gas A gas exists as a gas at room temperature. (Ex: O2)
A vapor comes from a solid or liquid at room temp. & changes to a vapor when heated. (Ex: water to steam)

7. States Of Water exception to the rule!
Notice that the liquid water molecules are closer together than the solid water molecules.

8. Its solid floats in its liquid!
When water freezes to ice, the water molecules line up in rows.  But as they do so, the molecules move apart slightly.  The ice increases in size as it forms and this gives ice a lower density than water, making it float in water.

9. Physical Properties
a characteristic that can be observed or measured without changing the identity of the substance
melting point
boiling point
density
solubility
descriptions

10. Physical Change
change in a substance that does not involve a change in the identity of the substance
Grinding
Cutting
Melting
Boiling

11. Chemical Properties
relates to a substance’s ability to undergo changes that transform it into different substances
reactivity
toxicity
flammability
type of bonding

12. Chemical Change
one or more substances are converted into different substances
The reactants are the substances that react in a chemical change.
The products are the substances that are formed by the chemical change.

13. Rust: a chemical reaction  
How to write a chemical reaction:         
4Fe + 3O2  Fe2O3
reactants      turns into     products

14. Evidence Of A Chemical Change
Precipitate (solid) Production
Gas Production (bubbles)
Color Change
Energy Release or Absorption

15. When a chemical or physical change happens both mass and energy are conserved.
WHAT DOES THAT MEAN??

16. Conservation of Energy
CONSERVATION OF MASS
The amount of matter before a reaction equals the amount of matter after a reaction
It is neither created nor destroyed, just rearranged.
Conservation of Energy
Energy is not created or destroyed in a reaction, it just changes form.
Example: Light Heat

17. Classification Of Matter