Week 2 NFTF 2nd hour 1.4. Physical and Chemical Change

1.0 MATTER
1.4 Physical and Chemical Change

1

What is physical changes ??

Change in the size, shape, or state of matter
NO new matter formed
NO chemical reactions occur

Examples:
1. breaking a pencil
2. phase changes (freezing, boiling, melting,
and shredding) - caused by adding or
removing energy

2

Examples of Physical Changes

• Crumpling a sheet of aluminum foil

• Melting an ice cube

• Casting silver in a mold

• Breaking a bottle

• Boiling water

• Evaporating alcohol

• Shredding paper

• Sublimation of dry ice into carbon dioxide

vapor 3

4

What is chemical changes ??

Change that produces a different kind of
matter
Evidence of a chemical change

1. Bubbles
2. New colour
3. Different smell
4. Heat absorb or release
Examples:
1. Burning
2. cooking
3. Rusting
4. Rotting

5

Examples of Chemical Changes

• Burning wood
• Souring milk
• Mixing acid and base
• Digesting food
• Cooking an egg
• Heating sugar to form caramel
• Baking a cake
• Rusting of iron

6

Indication for Chemical
Changes

• Chemical reactions release or absorb heat
or other energy or may produce a gas,
odor, color or sound.

• If you don't see any of these indications, a
physical change likely occurred.

7

Reaction of sulphuric acid and sugar

Explosion 8

D I Y 1.4

1. Name that change, physical or chemical change ?

Ice cube melting
Nail rusting
Water boiling
Cooking pizza
Tarnished penny
Combustion of hydrogen gas