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Score
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5
×
Energy is needed to break the bonds in a chemical reaction.
true
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25
×
An experiment has 1 element and 1 compound and ends up with a different element and a different compound. What type of reaction is this?
single replacement
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×
lifesaver
Give 15 points!
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×
rocket
Go to first place!
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×
gift
Win 25 points!
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×
banana
Go to last place!
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20
×
what type of reaction becomes colder?
endothermic
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5
×
What is NaCl?
salt
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20
×
Nate observed an experiment where 1 substance produced 2 substances. What type of a reaction is this?
decomposition
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20
×
This is certain proof that a chemical reaction has occurred.
change of chemical properties
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×
seesaw
Swap points!
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seesaw
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gift
Win 25 points!
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×
lifesaver
Give 10 points!
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15
×
2 atoms of calcium can react to create 6 atoms of calcium.
false
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10
×
Chemical reactions are balanced by changing the subscripts of the molecules.
false
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25
×
This is the minimum amount of energy needed for a chemical reaction to occur.
activation energy
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15
×
A change in shape of an object is an example of ____.
physical change
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10
×
In a chemical reaction, what are the substances on the right side of the arrow called?
product
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baam
Lose 10 points!
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gold
Win 50 points!
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rocket
Go to first place!
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banana
Go to last place!
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15
×
Which will burn fastest in open air, a log 2 feet in diameter, or a pile of splinters made from a 2 foot diameter log?
pile of splinters made from a 2 foot diameter log
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20
×
During a combustion reaction, what element must be part of the reactant?
oxygen (O2)
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