UNIT 6
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the process of breaking chemical bonds in 1 or more substances and the reforming of new bonds to create new substances.
chemical reaction
what are the 4 main indicators of a chemical reaction?
formation of new gas or solid. Release of energy and color change
the starting substance
reactant
the new substances which result from the chemical reaction
products
when a chemical reaction is written using chemical formula and symbols
chemical equation
takes place when a fuel and an oxidant react, producing heat and light
combustion
one element replaces a similar element in a compound. (ax+b = bx+a)
single replacement
a chemical reaction in which a single compound is broken down to produce 2 or more smaller compounds
decomposition
2 or more substances combine to form a new compound
synthesis reaction
ions from 2 compounds in solution exchange places to produce 2 new compounds
double replacement
the formation of a cloudy precipitate is evidence that a __________ reaction has occured
double replacement
a closed system must be used when studying chemical reactions
law of conservation of mass
an equation in which the number of atoms of each element as a reactant is equal to the number of atoms of that element as a product
balanced equation
the number that is placed in front of products and reactants
coefficients
energy stored in the chemical bonds of a substance
chemical energy
the energy required to break the bonds on the reactants side in order for a chemical reaction to occur
activation energy
breaking bonds =
releasing energy
forming bonds =
absorb energy
when a reaction makes and releases its own heat it is called
exothermic reaction
when a reaction absorbs heat from the surroundings it is called
endothermic reaction