exothermic, endothermic, reaction rate, la chateliers principle
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32 Terms
What is energy?
Energy is the capacity to do work.
What is potential energy?
Stored energy.
What is kinetic energy?
Energy of motion.
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed.
It can only change forms.
endothermic reaction?
Absorbs heat
endothermic reaction?
ΔH is positive (+)
endothermic reaction
Products have higher energy than reactants
endothermic reaction
Energy is on the reactant side
endothermic reaction
A + B + energy → C
exothermic reaction
Releases heat
exothermic reaction
ΔH is negative (−)
exothermic reaction
Products have lower energy than reactants
exothermic reaction
Energy is on the product side
exothermic reaction
A + B → C + energy
Breaking bonds
Endothermic( requires energy)
Forming bonds
Exothermic(Releases energy)
What is bond dissociation energy?
The energy required to break a covalent bond.(It is always positive because breaking bonds requires energy.)
Stronger bond
Higher bond dissociation energy
Weaker bond
Lower bond dissociation energy
What is activation energy (Ea)?
The minimum energy needed for a reaction to occur.
Higher Ea
Slower reaction
Lower Ea
Faster reaction
Factors that increase reaction rate
Increase concentration,Increase temperature, Add a catalyst
What is a catalyst?
A substance that speeds up a reaction by lowering activation energy.
What is equilibrium?
When the forward reaction rate equals the reverse reaction rate. ( product and reactantstays constant)
What is Kc?
The equilibrium constant [products]^coefficients / [reactants]^coefficients, Coefficients become exponents.
Le Châtelier’s Principle
If an equilibrium is disturbed, it shifts to reduce the disturbance.
What happens when you add reactants?
Equilibrium shifts right (toward products)
What happens when you remove reactants?
Equilibrium shifts left
What happens when you add products
Equilibrium shifts left.
What happens when you remove products?
Equilibrium shifts right.
If there's a reactant that's not in the reaction
No effect