5.0 Chemistry:Equilibrium-LeChatelier's Principle-With Questions

Since  is positive, the reaction is ________ and heat is a _______

• exothermic / product

• exothermic / reactant

• endothermic / reactant

• endothermic / product

The forward reaction is the reaction that produces the _______ and the reverse reaction regenerates  _____.

• products / reactants

• reactants / products

When a chemical system is at equilibrium nothing is happening. 

• False.  The forward and reverse reactions are still occurring, but they are happening at the same rate which is why concentrations remain constant.

• True. You know that because the concentrations have stopped changing.

"A shift to the left" means more _____ will be generated.

• products

• reactants

What will have less collisions?

• It depends on the molar mass of the gas molecules

• 5 moles of gas

• 3 moles of gas

According to the chemical reaction, what reacts with the heat? Pick all that apply.

• CH₄

• CS₂

• H₂

• H₂S

If you INCREASE the concentration of one of the substances, equilibrium will shift (Hint: only one answer is correct)

• to the same side (i.e. you ADD product and equilibrium shifts to the product side

• it's impossible to tell and Henri Le Chatelier was insane 

• to the opposite side (i.e. you ADD product and equilibrium shifts to the reactant side

If you DECREASE the concentration of one of the substances, equilibrium will shift  (Hint: only one answer is correct)

• to the opposite side (i.e. you REMOVE product and equilibrium shifts to the reactant side). 

• to the same side (i.e. you REMOVE product and equilibrium shifts to the product side).

• I still think Henri Le Chatelier was crazy.

When a chemical system is in equilibrium and a disturbance is made, the system has a tendency to restore equilibrium by ________ the disturbance and a new equilibrium is achieved.