1. Physical vs Chemical Changes
Ms. Conner/Ms. Fagg

2. Physical and Chemical Changes
MATTER: Anything that has mass and a volume.
ATOMS: The building blocks of matter.
MOLECULES: Two or more atoms that are joined together by chemical bonds.
Physical and Chemical Changes

3. A change is a substance that does not change the chemical makeup of the substance.
EXAMPLES:
1. Breaking Watermelon – Changing from one big piece into multiple smaller pieces.
2. Ice Cream Melting – Changing from one state of matter to another
Physical Change

4. Characteristics of Physical Changes
MELTING:
Solid Liquid
Shape
Temperature
FREEZING:
Liquid Solid
VAPORIZATION:
YOUR TURN?!?!
CRUSHING:
YOUR TURN!?!?!
BREAKING:
Any Others?!?!?!
CONDENSATION:
Gas Liquid
What else?!?!
Characteristics of Physical Changes

5. SUBSTANCES STAY THE SAME, BUT SHAPE, SIZE OR FORM DIFFER.

6. Phases of Matter Matter Changes
3 states of matter: Solid, Liquid, Gas
Phase changes _________ change the particles.
They ________ up with ____________.
SOLIDS: Structural rigidity and resistance to changes of shape or volume.
Particles of solids are tightly packed, vibrating about a fixed position.
Phases of Matter Matter Changes

7. **Add heat to a solid and you get…
LIQUIDS: The only state with a definite volume but no fixed shape.
Particles of liquids are tightly packed, but are far enough apart to slide over one another
**Add heat to a solid and you get…

8. **Add heat to a liquid and you get…
GAS: Made up of individual atoms, elemental molecules made from one type of atom or compound molecules made from a variety of atoms.
Indefinite Shape and an Indefinite Volume
Particles of gases are very far apart and move freely
**Add heat to a liquid and you get…

9. PHASE CHANGE = Physical Changes
From a:
To a:
Phase Change:
Added or Subtracted Energy:
SOLID
LIQUID
MELTING
ADDING HEAT/ENERGY
FREEZING
SUBTRACTING HEAT/ENERGY
GAS
CONDENSATION
VAPORIZATION/ BOILING/ EVAPORATION
SUBLIMATION
PHASE CHANGE = Physical Changes

10. Why are the freezing point and the melting point the same?
Freezing Point of Water: 32°F , 0°C
Melting Point of Water: 32°F , 0°C
Boiling Point of Water: 212°F , 100°C
Why are the freezing point and the melting point the same?

11. ***CHEMICAL CHANGES PRODUCES A NEW SUBSTANCE***
Change that results in the formation of a new product
Examples:
Rusty Car – Metal and oxygen react to form Iron Oxide.
Sodium metal and Chlorine gas react to form Sodium Chloride, Table Salt.
Digesting food – food is broken down by stomach acid.
Chemical Changes:

12. BURNING:
RUSTING:
NEW COLOR:
BUBBLES/GAS FORMS:
2 LIQUIDS FORM A SOLID:
Take 5 minutes and try to identify some characteristics of each of these chemical changes.

13. Process by which elements and compounds combine to form new substances.
Examples:
1. Rust
2. Battery
3. Burning Wood
Chemical Reactions: