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what does an arrow mean in a chemical equation?
when do chemical reactions occur?
when substances go through chemical changes to form new substances
what is a substance that participates in a chemical reaction?
what is a substance that forms in a chemical reaction?
chemical reactions always involve what?
changes in energy
what must be added to break bonds?
energy released when a chemical compound reacts to produce new compounds
where does the chemical energy released in a chemical reaction come from?
from the stored energy in chemical bonds
chemical reaction in which energy is released to the surroundings as heat
chemical reaction that requires energy input
reactions that release energy are ___ (exothermic/endothermic)
reactions that absorb energy are ___ (exothermic/endothermic)
what is the difference between an exothermic reaction and endothermic reaction?
exothermic reactions releases energy
endothermic reactions absorb energy
what type of reaction is photosynthesis?