Rate equations

Question 1

reaction rate definition

Answer 1

Change in the amount of reactants/products over a certain period of time.

Question 2

gradient formula

Answer 2

change in y/change in x

Question 3

rate equations

Answer 3

A+B->C+D

rate=k{A}^m{B}^n

This equations show how rate is affected by concentration of reactants

k is constant
m and n are orders of reaction

Question 4

if {A} changes, and the rate stays the same, what is the order of reaction?

Answer 4

zero order, so if {A} doubles, rate of reactions stays the same

Question 5

If [A} is proportional to the rate, then what is the order of reaction

Answer 5

First order, as {A} doubles, rate doubles

Question 6

If rate is proportional to {A}^2, then what is the order of the reaction

Answer 6

Second order
So if A doubles rate will be 2^2=4 times faster
if A triples rate will be = 3^2= 9 faster
if A quadruples rate will be = 4^2= 16 times faster

Question 7

the bigger the value of k……….

• what affects rate constant?

Answer 7

the faster the rate of reaction

• rate constant is always the same at a particular temperature, however if you increase the temperature, rate constant will also increase.

Question 8

what are the units for first, second, third order of reaction?

Answer 8

Order of reaction:

first: s^-1
second: mol^-1dm^3^s-1
third: mol^-2dm^6^s^-1