Lesson 8 - Chemical Reaction Rates

Question 1

Reaction Rates

Answer 1

Measures the change in amount of reactants consumed/products formed over a given time interval

Question 2

rate=

Answer 2

Δquantity/Δtime

Question 3

r=

Answer 3

r= [A]f-[A]i/tf=ti = Δ[A]/Δt

Question 4

Why is the reaction rate not consistent throughout the reaction?

Answer 4

As more reactant is consumed and more product formed, there is less reactant able to create more product, thus the reaction rate decreases.

Question 5

Average reaction rate

Answer 5

Average change in concentration over a given time interval. It is calculated by taking the slope between 2 points on a concentration graph.

Question 6

Instantaneous reaction rate

Answer 6

Rate of reaction at a specific time. It is calculated by taking the slope of a tangent

Question 7

By convention, why is reaction rate always positive?

Answer 7

By convention, reaction rate is always positive because it considers the overall rate of production of products.

Question 8

What do the rates of products and reactants depend on?

Answer 8

Direction of the reaction and the stochiometry

Question 9

r=

Answer 9

r = -1/bΔ[B]/Δt = +1/cΔ[C]/Δt = +1/dΔ[D]/Δt