How is it possible that water is a by-product of burning cellulose?
The cellulose contains the elements hydrogen and oxygen. H and O.
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20
How are ice and water the same if they are in two different states of matter?
They are the same chemical formula - H2O.
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15
What is a catalyst?
something that speeds up a chemical reaction
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15
True or False? If matter looks different, it has definitely undergone a chemical change.
False
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15
Fill in the blank: A physical change is a change in size, _____________, or state of matter.
shape
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15
Identify a chemical change mentioned in the book that occurs more quickly.
baking (rusting of iron with a salt catalyst)
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15
Fill in the blank. Matter can neither be _______________ nor destroyed.
created
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15
True or False? Dissolving is a physical change.
True
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trap
No points!
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gold
Win 50 points!
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gift
Win 25 points!
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lifesaver
Give 25 points!
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15
When matter changes, what is always conserved?
matter
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monster
Reset all scores!
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star
Double points!
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gift
Win 5 points!
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banana
Go to last place!
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15
Identify a slow chemical change mentioned in the book.
the rusting of iron
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15
When might it appear that matter has been lost?
when a gas is produced
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20
How can you extract salt from water after it has been dissolved?
Allow the water to evaporate.
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25
You are working with a certain material. It looks different than when you first started working with it. Has it definitely undergone a chemical change? Yes or no? Explain.
