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If energy flows into a chemical reaction, it is an endothermic reaction.
. a. The chemicals in the hot pack mix and the reaction releases energy in the form of heat. b. The reaction is exothermic.
10. a. The chemicals in the cold pack mix and the reaction absorbs energy in the form of heat from its surroundings.
biochemical reaction: a chemical reaction that occurs in living things
catalyst: a chemical that speeds up a reaction
chemical change: the change that occurs when substances react in a chemical reaction to create different substances
combustion: a chemical reaction that occurs when oxygen reacts rapidly with a substance to form a new substance and release energy
endothermic reaction: a reaction that absorbs energy
exothermic reaction: a reaction that releases energy
product: a substance that is produced by a chemical reaction
reactant: a substance that reacts in a chemical
b. The reaction is endothermic.
11. Another important exothermic reaction is the combustion of a fossil fuel.
12. To indicate that energy is released in a chemical reaction, add “+ energy” on the product side of the chemical equation.
13. A lead-acid battery does not last forever because, eventually, its components, such as the acid and the separator plates, break down.
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