Aqa combined science chemistry paper 1

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Last updated 9:33 AM on 5/17/26

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An element

A substance that is made of 1 type of atom

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a compound

Two or more atoms that are chemically bonded

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an endothermic reaction

A reaction that takes heat from the surroundings cuasing the surroundings to become cold

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an exothermic reaction

A reaction that gives out heat energy to the surroundings

(Gets hotter)

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Who created the plum pudding model

JJ Thomson

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The most reactive element

Pottasium