Rates of Reaction Exam1 and Problem Solutions

Rates of Reaction Exam1 and Problem Solutions

1. Which ones of the followings increases rate of reaction in gas phase;

I. Adding catalysts

II. Decreasing pressure

III. Increasing temperature

IV. Increasing volume


Rate of chemical reaction in gas phase increases with; adding catalysts, increasing pressure or decreasing volume, increasing temperature. Thus, decreasing pressure and increasing volume decreases rate of reaction rate. I and III increases reaction rate.

2. X gas in a container gives following reaction;

2X(g) ↔ Y(g)

Kinetic energies of X gas at temperatures 1 and 2 are given below.If temperature is changed from T1 to T2, which ones of the followings increase?

I. Rate of reaction

II. Number of particles that are activated

III. Average kinetic energy

rate of reaction exam1











When you examine the graph, you can see that number of particles at T2 is larger than number of particles at T1. We brush the area that shows number of particles in both temperatures in given graph below;


rate of reaction exam1solution










I, II and III are true.


3. Steps of a reaction are given below;

2A + B → 2C  ∆H1 < 0

C + D → A + 2E  ∆H2 < 0

Which ones of the followings are true for this reaction;

I. Reaction is; B + 2D → 4E

II. It is exothermic

III. A and C are catalysts


We multiply second reaction with 2 and sum with reaction I.

2A + B → 2C  ∆H1 < 0

2C + 2D → 2A + 4E  ∆H2 < 0


B + 2D → 4E ∆H < 0

I is true, since ∆H < 0, reaction is exothermic and II is also true. A joins the reaction and leave without any change in its structure, so it is catalyst but C is not catalyst. III is false.


4. Reaction; 2AB2(g) + C2(g) → 2AB2C(g) takes place in two steps. If fast step of this reaction is;

AB2(g) + C(g) → AB2C(g)

find rate of this reaction.


If we reverse the fast step and sum it with following reaction we can find slow step of this reaction.

2AB2(g) + C2(g) → 2AB2C(g)

AB2C(g) → AB2(g) + C(g)


AB2(g) + C2(g) → AB2C(g) + C(g) this is slow step of reaction.

Reaction Rate=k.[AB2].[C2]


5. A reaction have slow and fast steps as given below;

I. NO(g) + Cl2(g)  ↔ NOCl2(g) Fast

II. NOCl2(g) + NO(g) → 2NOCl(g)

Which ones of the following statements are true for this reaction?

I. Reaction is; 2NO(g) + Cl2(g) → 2NOCl(g)

II. Reaction Rate = k.[Cl2].[NO]

III. Activation energy of fast step is lower than slow step


NO(g) + Cl2(g)  ↔ NOCl2(g) Fast

NOCl2(g) + NO(g) → 2NOCl(g) Slow


Reaction: 2NO(g) + Cl2(g) → 2NOCl(g) I is true.

II. Reaction rate is found using slow step of reaction.

Reaction Rate = k.[NOCl2].[NO] II is false

III. Increasing activation energy decreases reaction rate. III is true.




increasing volume adding catalyst lower reaction rate
reaction rate problems and solution
NOCl2 structure
rate of reaction problems and solution
reaction rate problems solutions
reaction rates exam
what is the number of steps in a reaction A+B---2C+D
chemical reaction rate exams
kinetic reaction rate problem and solution
problems and solutions in rates of reactions
exam on solutions, gases, and chemical reactions
rate reaction problems and solutions
exam rate chemical reactions
slow and fast reactions in chemistry
reaction rate problems and solutions
rate problems problems with solution
chemical reaction rate problems
pressure in rate of reactions problem
rate problems with solutions
rate of reaction
for the reaction 2C- A+B which of the following is true
reaction rate problems
kinetic energy and number of particles graph
rates of reaction
reaction rates
true solutions in chemistry
temperature rate of reaction
which ones of the followings
Increase of temperature on reaction rate graph
reaction rates problems and solutions
rate of solutions in chemistry
if you add kinetic energy to reaction what happens to graph
rate of chemical reactions problems with solution
for the reaction 2c a + b which of the following is true? a is produced at
solutions to reaction rate problems
rate of reaction temperature
rates of reactions
for the reaction 2C yields A+B which of the following is true
reaction rates kinetic energy
graph on rate of reaction
For the reaction 2C---A+B
rates of reaction problem
solutions for rate of reaction
reaction rate problems answers
reaction rate problemd and solution
problems rate of reaction
rate of reaction problems with answers
rates of chemistry reactions problems
Rates of chemical reactions problems
rate of chemical reaction problem