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If energy flows out of a chemical reaction, it is an exothermic reaction.

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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