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What is the difference between a product and a reactant?
The difference between a product and a reactant simply is that one is a cause and the other is an effect. A reactant is the "cause" because it reacts with another substance. When the reactant makes the reaction with the other substance, it creates the product. The product is what is made from that chemical reaction. The reactant comes first and the product comes after.

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What is the difference between an exothermic and an endothermic reaction?
The difference between the two is mainly the way that they change and use energy. While an exothermic reaction gives off energy, an endothermic reaction absorbs it. This causes an exothermic reaction to give off heat and an endothermic reaction to be cold. Both are energy changes causing a temperature change and often an appearance change, so they are similar in some areas and different in others.

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This is an example of a chemical equation because it shows the basics of a chemical reaction.

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A chemical reaction that absorbs energy

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An ice pack activating is an example of an endothermic reaction because the input energy is greater than the out put energy causing it to be cold

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A shorthand method to show what happens during a chemical reaction

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Umm...
well, whether or not you find any of this even remotely interesting, it governs the world you live in. Though you don't need to know about the science of chemical reactions to get through everyday life, if the way it worked was different, your every day life would be very different. Life might not even exist at all, but if it still did, it would be very, very, very different, so at the very least, you wouldn't exist.

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The substance that is made during a chemical reaction

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A substance that reacts with another substance in a chemical reaction

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A candle is an example of an exothermic reaction because the output energy is greater than the input energy causing it to give off heat.

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A chemical reaction that releases energy