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Answer Key
Grade 8 Science: Chemical Reactions & Conservation of Mass
1.
chemical reaction
2.
reactants
3.
products
4.
the same/conserved
5.
atom/element
6.
chemical reaction
7.
chemical reaction
8.
chemical
9.
mass is not created or destroyed during a chemical reaction in a closed system
10.
color change, gas production, precipitate, temperature change, odor (any three)
11.
reactants are starting substances; products are new substances formed
12.
it is still butter; only physical state changed, no new substance formed
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