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Chemical Reactions
Chapter 3
12
Science
8th Grade
11/24/2014

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Term
chemical reaction
Definition
produces new substances by changing the way in which atoms are arranged
Term
reactants
Definition
are the substances present at the beginning of a chemical reaction
Term
products
Definition
are the substances formed by a chemical reaction
Term
precipitate
Definition
may form when chemicals in two liquids react
Term
catalyst
Definition
is a substance that increases the rate of a chemical reaction but is not itself consumed in the reaction
Term
law of conservation of mass
Definition
states that in a chemical reaction atoms are neither created nor destroyed
Term
coefficients
Definition
indicate how many molecules take part in the reaction
Term
bond energy
Definition
the energy associated with bonds
Term
exothermic reaction
Definition
a reaction in which energy is released
Term
endothermic reaction
Definition
a reaction in which energy is absorbed
Term
photosynthesis
Definition
plants absorb energy from sunlight to turn carbon dioxide and water into oxygen and glucose, which is a type of molecule
Term
respiration
Definition
living cells obtain energy from glucose molecules
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