Physical Science ?

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1. Cooking requires continuous addition of energy to the chemical reactions that are taking place. The chemical reactions involved in cooking can be described as _____.
2. Measuring how quickly a reactant disappears is one way to measure the _____ of the reaction.
3. A chunk of limestone, which is calcium carbonate, reacts with acid at a certain rate. If the limestone were crushed, the rate of reaction between the acid and the limestone would _____.
Thank you so much for your help, I'm really stuck on these three.

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