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Unit 7 (set 2)
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signs of a chemical reaction
unexpected color change
unexpected temperature change
gas produced
formation of a precipitate
odor
energy released in the form of heat (feels hot)
exothermic reaction
reaction in which energy is absorbed (turns cold)
endothermic
what is seen when gas is produced?
bubbles
what does the law of conservation of mass state?
mass cannot be created or destroyed
equations in conservation of mass serve as ___
recipe
parts of chemical reaction equation
reactant
product
subscript
coefficient
what must you use to determine the number of atoms in an equation?
subscripts
coefficients
to balance an equation, how many atoms on each side should there be?
same number of atoms on reactant side must also be on the product side
how do you make the number of atoms equal on both sides?
place coefficient in front of whole compound or element being affected
diatomic molecules
oxygen
hydrogen
fluorine
chlorine
nitrogen
bromine
iodine
reaction in which 2 or more substances combine to form a single more complex substance
synthesis reaction
reaction in which a complex substance breaks down into 2 or more simpler substances
decomposition reaction
uncombined element replaces an element that is part of a compound
single replacement
different atoms in 2 different compounds replace each other
double replacement
what does a higher temperature do to the rate of reaction?
more particle movement and more collisions
what does a greater surface area do to affect the rate of reaction?
gives more surface for the reaction to occur
how does greater concentration of a solution affect the rate of reaction?
more collisions occur with greater concentration
substance that changes the rate of chemical reaction without being consumed
catalyst
how does a catalyst affect energy?
lowers the amount of energy needed to start a reaction
example of a catalyst
catalytic converter enzymes
balance equation:
H2 + O2 --> H2O
2 H2 + O2 --> 2 H2O
Author
jb124
ID
287603
Card Set
Unit 7 (set 2)
Description
chemical reactions
Updated
2014-10-30T21:43:51Z
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