Physical and Chemical Change
Physical Change
A physical change is a change in matter that doesn't change what the substance is. Physical changes do not change size, mass or shape.
Physical Changes can be caused by:
Cutting
Bending
Warming
Melting
Mixing
Breaking
Crushing
Physical changes are all around us… Can you think why these are categorized as physical changes?
- Mowing grass Cutting hair
- A glass vase shatters
- Water freezes
- Adding food coloring to water
- Tearing paper
- Molding clay
- Painting a wall
- Water changes into steam
The pictures below are more examples of a physical change.
Chemical Changes
A chemical change is creates a NEW type of matter that CANNOT be REVERSED.
The indicators of a chemical change are:
Gas (Bubbles)
Color Change
Light/Flame
Temperature Change
Texture Change
Precipitate Formation
Chemical changes are all around us… Can you think why these are categorized as chemical changes?
- Frying an Egg
- Baking A Cake
- Rusting Iron
- Burning Wood
- Digesting Food
- Mixing Baking Soda and Vinegar
- Fireworks Exploding
- Leaves Changing Color in Fall
The pictures below are more examples of a chemical change.
Physical and Chemical Changes: Chemistry for Kids - FreeSchool
Physical and Chemical Change
Chemical Changes: Crash Course Kids #19.2
Image Title
Physical and Chemical Change Practice
_____ Iron turns to rust
_____ Tearing paper
_____ Baking a cake
_____ Frying or boiling an egg
_____ Mixing sand and gravel
_____ Glass shattering
_____ Water freezing
_____ Banana rotting
_____ A match tip being struck to create fire
_____ Water evaporating
_____ Fireworks exploding
_____ Carving a pumpkin
_____ Silver tarnishing
_____ Digesting food
_____ Leaves decomposing
Bill Nye Chemical Reactions
When chemicals get together, they __________________________.
Chemical reactions happen when ____________________hook together.
What happens when you put pennies, salt and vinegar in a jar?
Consider the following:
4. What happens if you breathe in chlorine gas?
5. What happens when you add sodium to chlorine gas?
6. Name five different examples of chemical reactions mentioned in the video?
a. __________________________________
b.__________________________________
c. __________________________________
d. __________________________________
e. __________________________________
7. What did Alfred Nobel invent?
8. How much money did a person receive if they won the Nobel Prize?
Mixtures
Mixtures are physical combination of two or more substances. They are two parts that blend together that does not change their chemical properties. These substances CAN be separated. Mixtures are a physical change.
Examples:
Sandwich
Salad
Trail Mix
Pencil Box
Ways to Separate a Mixture:
Pick out the objects one by one
Use floating
Use a magnet
Use a filter
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Solutions
Solutions are a mixtures where the substance dissolves into another. The solution looks the same everywhere. These mixtures CAN be separated.
Examples:
Saltwater
Kool-Aid
Sugar Water
Lemonade
Ways to Separate the Solution:
Boil the solution or let the liquid evaporate. The substance that was dissolved in the liquid will remain in the bottom after the liquid has been boiled or evaporated.
How to Separate Solutions
Watch this video to learn about separating solutions!