Unit 7 (set 2)
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signs of a chemical reaction
unexpected color change
unexpected temperature change
formation of a precipitate
energy released in the form of heat (feels hot)
reaction in which energy is absorbed (turns cold)
what is seen when gas is produced?
what does the law of conservation of mass state?
mass cannot be created or destroyed
equations in conservation of mass serve as ___
parts of chemical reaction equation
what must you use to determine the number of atoms in an equation?
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
reaction in which 2 or more substances combine to form a single more complex substance
reaction in which a complex substance breaks down into 2 or more simpler substances
uncombined element replaces an element that is part of a compound
different atoms in 2 different compounds replace each other
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
how does a catalyst affect energy?
lowers the amount of energy needed to start a reaction
example of a catalyst
catalytic converter enzymes
H2 + O2 --> H2O
2 H2 + O2 --> 2 H2O
Unit 7 (set 2)