WSC 12CHM: Unit 3 review

If a system is at equilibrium, it means that...

• The reaction has stopped

• The backward reaction has begun

• There is an equal amount of reactant and product

• The rate of the forward and backward reactions are equal

Which of the following can be exchanged with the surroundings in a closed chemical system?

• Matter only

• Energy only

• Matter and energy

• Neither matter nor energy

The forward reaction in an equilibrium system is exothermic. If I cool down the system, in response it will favour the...

• forward reaction

• backward reaction

Removing the products from any equilibrium system will cause the system to favour the...

• Forward reaction

• Backward reaction

A Bronsted-Lowry acid turns into its _________ after donating a proton.

Identify the Ka value below that corresponds to the weakest acid.

I am the point in time in a titration when the moles of acid are equal to the moles of base. I am the...

• equivalence point

• half-equivalence point

• end point

• half-end point

I am the point in time in a titration when the indicator changes colour. I am the...

• equivalence point

• half-equivalence point

• end point

• half-end point

I am a point in time during a titration. My pH is equal to the pKa of the acid involved in the titration. I am the...

• equivalence point

• half-equivalence point

• end point

• half-end point

Which indicator would be most appropriate for a titration between a strong base and a weak acid?

• methyl red

• methyl orange

• bromocresol green

• phenolphthalein