Review: What is a physical change?
A change that does NOT create a new substance!!!
BIG Idea: A chemical change is one
that changes the way the atoms and molecules are connected and creates a new substance.
Signs of a Chemical Change
A piece of matter is probably going through a chemical change if any of the following things happen:
Examples: burning wood in a campfire turning into ash.
Example: heat rising from the wood burning in the campfire.
Examples: wood turning black in the campfire.
4) It makes gas bubbles.
Examples: antacid tablet bubbling when making contact with water.
A chemical change CANNOT be reversed.
Criteria for Success:
To decide if a change is physical or chemical, here are some EXAMPLES of questions you can ask yourself:
Can it be reversed?
Yes: physical______________
No: _chemical______________
Is something new being created?
Yes: chemical
No: physical
Are there any signs of a chemical change?
Yes: chemical
No: physical
Is it a change in state (freezing, melting, etc.)?
Yes: physical
No: chemical (maybe, need to ask more questions)
Your Own Question: Does it create an odor?
Yes: chemical
No: physical
Observation #1 - Kool-Aid Pickles
Observation #2 - Gummy Bear in molten potassium chlorate
Observation #3 - Bromine and Alcohol
Observation #4 - Dry Ice Sublimation
Observation #5 - Bleach Shirts
Observation #6 - Calcium and Fire
Check Yo Self:
2. Watch Brainpop Video:Property Changes and complete review quiz when finished to reach 80% Mastery.
3. Play the Brainpop Game: Matter Sorter.
Solids, Liquids, and Gases LW Part 2
Check Yo Self - Answer Key
3. Play the Brainpop Game: Matter Sorter.
Lifework
Step 1 - Identifying physical and chemical
changes: Write “P” for a physical change and “C” for a chemical change.
____1) A
match burning
____2)
Sawing a board in half
____3)
Crumpling a piece of paper
____4) Water
evaporating
____5) Rust
forming on a swingset
____6) Corn
starch dissolving in water
____7) Ice
cream melting
____8) Toast
turning black from heat
____9) Gas
bubbles produced by Alka-Seltzer
____10)
Steam coming off a block of ice
____11)
Hydrogen and oxygen combining to form water.
Step 2 – Pick a physical change and chemical
change from the above. Describe why each is a physical and chemical change.
12)
_____________________________________ is a physical change because __________________________________________________________________________________________________________________________________________________________________.
13)
_____________________________________ is a chemical change because
__________________________________________________________________________________________________________________________________________________________________.
Solids, Liquids, and Gases LW Part 2
Check Yo Self - Answer Key
- C
- C
- D
- D
- C
- A
- A
- B
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