WorksheetsQuiz-Reaction Energy and Equilibrium
Total questions: 25
Worksheet time: 18mins
Activation energy is:
Energy released in a reaction
Energy required to form the activated complex
Energy of the products
Heat absorbed
A catalyst changes which part of a reaction?
ΔH
Activation energy
Product energy
Reactant concentration
Increasing temperature increases reaction rate because:
Reactant energy decreases
More molecules have enough energy to overcome Ea
Collisions happen slower
Catalysts form
An inhibitor will:
Speed up a reaction
Slow down a reaction
Lower ΔH
Decrease concentration
In an exothermic reaction, ΔH is:
Positive
Negative
Zero
Always equal to Ea
For the reaction A + B ⇌ C, which is the correct Keq expression?
[A][B]/[C]
[C]/([A][B])
[A]/[C]
[B]−[A]
A small Keq value (Keq ≪ 1) means the reaction favors:
Products
Reactants
Both equally
Catalyst
The correct statement about a reaction at equilibrium is:
Forward and reverse rates are equal
Reactants stop changing into products
Only reactants remain
Only products remain
Use the following prompt to fill in the blanks in the box shown to the left.
A catalyst speeds up reactions by lowering the activation energy required for reaction collisions
What does this mean?
Particles do not need as much energy for reactions to happen
Particles will need more energy for reactions to happen
Particles will magically rearrange so that they always have the correct orientation for a reaction to happen
The reaction will not happen at all. Ever.
Which direction does the reaction shift if NH3 was added?
Rewrite the above equation with energy as a reactant or product:
heat + N2(g) + O2(g) <−> 2NO(g)
If the heat is removed to the chemical system, the equilibrium will _______.
2 NO(g) + O2(g) ⇌ 2 NO2(g)
Removing O2(g) will
an in Increase temperature will...
2SO2(g)+1O2(g) ⇌ 2SO3(g) + Heat
Increasing the volume of the container will...
shift equilibrium right
shift equilibrium left
slow rate of reaction
have no change
2SO2(g) + O2(g) ⇌ 2SO3(g) + Heat
Using a catalyst
shift equilibrium right
shift equilibrium left
increase the rate of reaction
have no change
Heat + 1 N2O4 → 2 NO2
What will happen when the temperature is increased?
Position of equilibrium will shift to left and become lighter in color
Position of equilibrium will shift to right and become more brown
No change in position of equilibrium
Position of equilibrium will shift to right and become lighter in color
