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Answer Key
Grade 7 Science: Substances, Mixtures & Chemical Reactions Intro
1.
substance
2.
mixture
3.
Homogeneous
4.
Heterogeneous
5.
chemical
6.
Reactants
7.
Products
8.
precipitate
9.
substance has fixed composition; mixture combines substances physically
10.
process where reactants form new products with different properties
11.
color change, gas produced, precipitate, temperature change (answers vary)
12.
total mass of reactants equals total mass of products in closed system
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