SCIENCE Lesson 3
high
The activation of some reactions is so ________that more energy is needed to start the reaction.
faster, collide, faster
Chemical reactions occur _____if the particles _______more often or if the particles move ________when they collide.
reactants
Catalysts also do not change the ________or the products of the reaction.
catils, activation
A ________increases reaction rate by lowering the _________energy of a reaction.
change
A catalyst is not itself permanently _______during a chemical reaction.
energy, bonds
All reactions require ________to start the breaking of ________.
enzyme
An __________is a catalyst that speeds up chemical reactions in living cells.
concentration
An increase in ____________also increases reaction rate because there are more particles to _________with each other
collide
At higher temperatures, particles _______more often.
absorbs
Breaking a chemical bond ______energy from the surroundings.
Chemical energy, bonds
Energy released in a chemical reaction comes from ______ _______ that is contained in chemical_____________
pressure, substances
For gases, increased ________pushes particles closer together, and more __________occur.
releases
Forming a chemical bond __________energy to the surroundings.
less, reactants
In these reactions, ______energy is required to break the bonds of the _______than is released when products form.
more, reactants
In these reactions, ____energy is required to break the bonds of the ________than is released when products form.
absorb
Most chemical reactions release more energy than they______
release
Some chemical reactions absorb more energy than they ________
start,
Some chemical reactions do not _______by themselves
inhibitors
Substances called __________slow down or stop a chemical reaction.
exposed
Surface area is the amount of ________outer area of a solid.
low, surroundings
The activation energy of some reaction is so ____that enough energy to start the reaction comes from the ____.
conserved
The energy in chemical bonds and the energy absorbed or released is always __________
speed
The rate of a reaction is the _______at which it occurs.
energy
They also collide with more ______.
Surface area
___________area can affect the rate of a reaction.
Temperature, temperature
__________can affect the rate of reaction because at higher _________particles move faster.
Activation energy
_________is the minimum amount of energy that is needed to start a chemical reaction.
Exothermic
_________reactions are chemical reactions that release thermal energy.
Increased, particles, particles
_________surface area increases the rate of reaction because more _________on the surface of a solid come in contact with the ________of another substance.
Endothermic
reactions are chemical reactions that absorb thermal energy.