Energy changes and chemical reactions
in these reactions _______ energy is required to break the bonds of the ______ than is released when products form
more, reactants
_______ can affect the rate of reaction because at higher _______ particles move faster
temperature, temperature
_________ area can affect the rate of a reaction
surface area
most chemical reactions release more energy than they ________
absorb
breaking a chemical bond __________ energy from the surroundings
absorbs
_________ is the minimum amount of energy that is needed to start a chemical reaction
activation energy
minimum amount of energy needed to start a chemical reaction
activation energy
substance that increases the reaction state by lowering the activation energy of a reaction
catalyst
a _____ increase reaction rate by lowering the ________ energy of a reaction
catalyst, activations
a catalyst is not itself permanently ______ during a chemical reaction
changed
energy released in a chemical reaction comes from _________ that is contained in chemical _____
chemical energy, bonds
at higher temperatures particles _______ more often
collide
an increase in _______also increases reaction rate because there are more particles to ______ with each other
concentration, collide
the energy in chemical bonds and the energy absorbed or released is always _______
conserved
_____ reactions are chemical reaction that absorb thermal energy
endothermic
chemical reactions that absorb thermal energy
endothermic
they also collide with more _____
energy
all reactions require ______ to start the breaking of ______
energy, bonds
an ________ is a catalysts that speeds up chemical reactions in living cells
enzyme
catalyst that speeds up chemical reactions in living cells
enzyme
______ reactions are chemical reactions that release thermal energy
exothermic
chemical reactions that release thermal energy
exothermic
surface area is the amount of ______ outer area of a solid
exposed
chemical reactions occur ______ if the particles _______ more often or if the particles move _________ when they collide
faster, collide, faster
the activation of some reactions is so ________ that more energy is needed to start the reaction
high
_______ surface area increases the rate of reaction because more _______ on the surface of a solid come in contact with the _____ of another substance
increase, particles,particles
substance that slows down or even stops a chemical reaction
inhibitor
substances called ______slow down or stop a chemical reaction
inhibitors
in these reactions ______ energy is required to break the bonds of the ________ than is released when products form
less, reactants
the activation energy of some reaction is so _____ that enough energy to start the reaction comes from the ________
low, surroundings
for gases increased _______ pushes particles closer together and more _______ occur
pressure, collisions
catalysts also no not change the ________ or the products of the reaction
reactants
some chemical reactions absorb more energy than they ________
release
forming a chemical bond _________energy to the surroundings
releases
the rate of a reaction is the _____ at which it occurs
speed
some chemical reactions do not _______ by themselves
start
