Physical Chemistry Quiz

For a second-order reaction, what is the unit of the rate of the reaction?

• s^-1

• mol L^-1s^-1

• mol^-1 L s^-1

• mol^-2 L² s^-1

• 0  

• 3 

• 1

• 2

Which of the following is expressions represents correctly rate of following reaction?
X + Y → Z + Q     ΔH = +22kj/mol

• Rate = +Δ[X] / Δt
• Rate = +Δ[Y] / Δt
• Rate = +Δ[Z] / Δt
• Rate = -Δ[Q] / Δt

How does a catalyst work in speeding up a reaction?

• by lowering the activation energy or reaction

• by giving them more energy

• by making them more available

• by increasing the activation energy or reaction

• 1

• 0

• 2

• -1

For the reaction...
N_{2 (g)} +  3 H_2 (g) <−> 2 NH_{3 (g)}

If the pressure in the system is increased,  _______ reaction will be favored.

•  the forward
• the reverse
• neither

Le Chatelier's Principle states that:

• a disturbing force must be applied to a system in order for it to reach equilibrium.

• when a system at equilibrium is disturbed, a new equilibrium constant is established.

• when a chemical system at equilibrium is disturbed, the system shifts in order to minimize the effect.

• when a chemical system is at equilibrium it is no longer possible to alter the system.

When pressure decreases, in which direction does the equilibrium shift?

• The equilibrium shifts in the direction that increases the number of moles of gas.

• The equilibrium shifts in the direction that decreases the number of moles of gas.

• The equilibrium does not shift.

• The equilibrium shifts always shifts to the right.

• The equilibrium shifts always shifts to the left.

For which of the following reactions does Kp = Kc?

• 3Fe(s) + 4H₂O(g) ⇌ Fe₃O₄(s) + 4H₂(g)

• C(s) + H₂O(g) ⇌ CO(g) + H₂(g)

• 2SO₂(g) + O₂(g) ⇌ 2SO₃(g)

• H₂(g) + I₂(s) ⇌ 2HI(g)

Ionic product of water increases if

• Pressure is reduced

• H + is added

• OH - is added

• Temperature is increased