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Answer Key
Grade 8 Reading — Science
1.
atoms are rearranged, not destroyed; bonds break and new bonds form
2.
carbon dioxide gas escapes into the air when the system is open
3.
reactants are starting substances; products are new substances created
4.
iron combines with oxygen from the air to form iron oxide, increasing total mass
5.
coefficients show how many units participate and every atom on the left must appear on the right
6.
it stays in motion at constant velocity unless an unbalanced force acts on it
7.
passengers keep moving forward when the car stops until the belt applies a force
8.
the skateboard has less mass, so acceleration is greater for the same force
9.
rockets expel gas downward and gas pushes the rocket upward (accept swimming example)
10.
acceleration
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