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Across
4.When two or more things crash into each other
5.The small pieces that make up a sustance eg molecules or atoms
7.speed, OR distance divided by time
8.The flow of energy from a warm object to a cooler one
9.A measure of how hot something is
10.The amount of energy a body possesses due to its motion (movement)
Down
1.The amount of energy required to get a reaction started
2.When bonds get broken, and new bonds are formed to produce new substances
3.A substance that speeds up a chemical reaction by lowering the activation energy
6.The amount of area exposed to the environment; the smaller the object, the larger its......

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