Comparing Physical and Chemical Changes Demonstrations
Purpose: ____________________________________________________________________________
Introduction: Use pages 48 – 51 to complete the following:
1. Define physical change
2. Give 3 examples of a physical change
3. Can most physical changes be reversed easily? Include an example to justify your answer.
4. Define chemical change.
5. Give 3 examples of a chemical change
6. Can most chemical changes be reversed easily? Include an example to justify your answer.
7. List 7 clues that a chemical change is happening. In other words, how can you tell is elements’
valance electrons are forming new bonds and making a new substance?
Change
HYPOTHESIS:
1. Describe what you think
will happen
2. Will a new substance be
created (chemical change)?
DATA:
1. Describe what did happen
2. Was a new substance
created (chemical change)?
Cut Paper
Flame and Paper
Candle Wax (white
part only) and flame
Candle wick (string)
and flame
Sugar in water
Baking powder and
water
CuSO4 and flame
Steel nail and water
Butter and heat
Popcorn kernel and
heat
Put a “P” next to the physical changes (no new substance created, no clues of a chemical change)
Put a “C” next to the chemical changes (new substance created with clues of a chemical change)
Comparing Physical and Chemical Changes Demonstrations Conclusion
Task: Write a PARAGRAPH that explains the difference between physical and chemical changes.
Class Discussion: Record Notes below from our discussion about what we should include in a good
SCIENCE conclusion.
A good Science lab conclusion should include:
1.
2.
3.
4.
5.
6.
7.
8.
More?
Write your conclusion on a separate piece of paper