4/28 Chemical Equilibrium

What are the three things needed for a reaction to occur?

• Collision

• Speed

• Orientation

• Energy

What is the rate of reaction?

What determines the rate of reaction?

• Temperature

• Concentration

• Catalyst

• Time

True/False: At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction.

Reactants form products in the ____ reaction.

When writing Kc constants, the concentration of the ____ goes in the numerator.

True/False: We can calculate the concentrations of our products and reactants even if the reaction hasn't reached equilibrium.

CH4 (g) + H2O (g) < === > CO (g) + 3 H2 (g)
If I wanted to make water, what direction would my reaction have to go?

Write Kc expression for the following reaction:
N₂ (g) + 3 Cl₂ (g) < === > 2 NCl₃ (g)

If our Kc constant is a large number, then there are more ____ than ____.

• reactants, products

• products, reactants

• this is wrong because we are in equilibrium with a big Kc.