Rate of Reaction

Which statement best defines the term Rate of a Reaction?

• A change in temperature of both reactant and product over time

• The changes in pressure of product or reactants over time.

• A change in the concentration of reactant or product over time

• The change in surface area of reactants over time

Given the reaction,

C₃H_8(g) + 5O_2(g) → 3CO_2(g) + 4H₂O_(g)

If the rate with respect to C₃H₈ = − 2.5 x 10^-3 mol dm^-3 s^-1

What is the rate with respect to Oxygen?

• − 1.25 x 10^-2 mol dm^-3 s^-1

• 1.25 x 10^-2 mol dm^-3 s^-1

• 6.25 x 10^-3 mol dm^-3 s^-1

• − 6.45 x 10^-3 mol dm^-3 s^-1

Given the reaction,

C₃H_8(g) + 5O_2(g) → 3CO_2(g) + 4H₂O_(g)

If the rate with respect to C₃H₈ = − 2.5 x 10^-3 mol dm^-3 s^-1

What is the rate with respect to Carbon Dioxide?

• 3.6 x 10^-3 mol dm^-3 s^-1

• − 4.5 x 10^-3 mol dm^-3 s^-1

• − 7.5 x 10^-3 mol dm^-3 s^-1

• 7.5 x 10^-3 mol dm^-3 s^-1

Given the reaction,

C₃H_8(g) + 5O_2(g) → 3CO_2(g) + 4H₂O_(g)

If the rate with respect to C₃H₈ = − 2.5 x 10^-3 mol dm^-3 s^-1

What is the rate with respect to Water?

• 3.6 x 10^-2 mol dm^-3 s^-1

• - 8.4 x 10^-2 mol dm^-3 s^-1

• 1.0 x 10^-2 mol dm^-3 s^-1

• -1.0 x 10^-2 mol dm^-3 s^-1

Definition: a species which increases the rate of the reaction and regenerated at the end of the reaction.

This definition best fits which factor?

• Pressure

• Temperature

• Catalyst

• Concentration