SCH4U Equilibrium

The forward reaction turns reactants into products; the reverse reaction turns...

• products into products
• products into reactants
• reactants into reactants
• reactants into products

Chemical equilibrium is reached when the ________ are equal.

• concentrations of reactants and products
• potential energies of reactants and products
• rates of forward and reverse reactions
• change in energies of forward and reverse reactions

A chemical reaction is usually irreversible if _____ is too great.

• the activation energy
• the drop of potential energy (heat released)
• the concentration of products
• the temperature

The higher the concentration of the products, the ____________.

• slower the reverse reaction
• faster the reverse reaction
• slower the forward reaction
• faster the forward reaction

At chemical equilibrium, ____________ stops.

• variation of the concentration of reactants and products
• only forward reaction
• only reverse reaction
• both forward and reverse reactions

Which of the following does affect the equilibrium in a reversible reaction?

• A closed system is now opened
• All of the reactants are converted to products at the start
• A catalyst is added
• All of the products are converted to reactants at the start

Q. A reaction in equilibrium means...

• The forward and reverse rates are equal

• The reaction has stopped

• Only products remain

• Only reactants remain

Which is the reactant - and why?

• A. The concentration is decreasing

• B. The concentration is increasing

• A. The concentration is increasing

• B. The concentration is decreasing

Q. X_(g) + 2 Y_(g) ↔ Z_(g) is at equilibrium so increasing X_(g)...

• stresses reactants, shifts equilibrium right

• stresses products, shifts equilibrium left

• doesn't do anything

• stresses reactants, shifts equilibrium left

T/F - Chemical equilibrium is a state of balance in which there is no net change in chemical composition over time.

• True

• False