Is melting butter for popcorn a chemical or physical change?
physical
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15
Give 3 examples of a chemical change (where the nature of the substance changes) (from your book or not)
iron that oxidises, food rotting, a match that burns
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15
Which of the following is NOT an example of a physical change? crumpled paper, pencil sharpening, shrunken clothing, or rust
rust
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15
When you have a fire with your friends, what kind of chemical change is happening?
Chemical change (the wood is different than how it looked at the beginning after it has burned.)
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lifesaver
Give 5 points!
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shark
Other team loses 5 points!
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rocket
Go to first place!
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baam
Lose 25 points!
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15
What are the two different types of changes of a substance?
In one type of change the substance remains the same (physical) and in the other it becomes different (chemical)
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15
rust on an iron fence. Chemical or physical change?
chemical
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15
Which is an example of a chemical reaction? paper cut into small pieces, chocolate melting in a pan, flour and sugar mixed in a bowl, cookies baking in an oven
cookies baking in an oven
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15
Freezing Juice? Physical or chemical change
Physical
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15
wax melting is an exmaple of a________
Physical change
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baam
Lose 15 points!
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magnet
Take 25 points!
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gift
Win 25 points!
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thief
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5
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25
15
A change where one or more new substances are created?
chemical
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15
Give 3 exmaples of a physical change (where the substance remains the same) (they don't have to be from your book)
broken pot, ice that melts, water solidifies
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20
do you think photosynthesis is an example of a phisical or chemical change?
since water and carbon dioxide combine to form glucose and oxygen, its a clear exmaple of a chemical change
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thief
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5
10
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25
gold
Win 50 points!
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fairy
Take points!
5
10
15
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25
lifesaver
Give 15 points!
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15
What is a sign that a chemical reaction has occurred?
change of color, presence of sediment or precipitate, production of gas, release of heat, etc
