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CHM 203 CBT PRACTICE TEST

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Take your time to read instructions before taking this test.

There are 40 questions which you are to answer in 15 minutes that gives you roughly 30 seconds per question.

If you can get at least 60%, you can be rest assured that you’ll ace CHM 203 exam

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PS

In a normal exam you will be asked between 40 – 60 questions but I only arranged 40 questions

Note

Do not be in a hurry to answer the questions

Do not waste time on a question you don’t know

Move as fast as possible and starting with questions that don’t have calculation first to save time

Always crosscheck

Don’t be in a hurry to submit, you are not in a competition

Don’t be scared. Getting an A is easy

Don’t be over confident, you can end up a D, E or F. Calm your blood, no be only you sabi book

Please do well to use our comment box incase there’s a message you want to pass to us

70 – 100 A

60 – 69 B

50 – 59 C

45 – 49 D

40 – 44 E

0 – 39 F

I wish you success

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CHM 203

1 / 39

1.

Every type of chemical bond contains a certain amount of energy. The total bond energy, which is essentially equivalent to the total potential energy of the system, is a quantity known as:

 

2 / 39

2.

Which of these is true of an isochoric system?

3 / 39

3.

The temperature remains constant as energy is added to a substance. How may the substance be changing?

 

4 / 39

4.

Thermodynamics can be used to determine all of the following EXCEPT

5 / 39

5.

When extra NH3 is added to the following system at equilibrium: 3H2(g) + N2(g) ➡️ 2 NH3(g), what happens?

 

6 / 39

6.

A statement of the second law of thermodynamics is that

7 / 39

7.

Which of the following statements about enthalpy is incorrect?

8 / 39

8.

All of the following processes lead to an increase in entropy EXCEPT

9 / 39

9.

Which of the following expressions is associated with the law of conservation of energy?

10 / 39

10.

Which of these followings would lead to an increase in the internal energy of a system?

11 / 39

11.

If a chemical reaction has a positive change in entropy, 🔼S, then

12 / 39

12.

In a reaction: 2A ➡️B + 2C, which of the statement is true?

13 / 39

13.

The reactions with the high value of energy of activation are

 

14 / 39

14.

The common-ion effect

15 / 39

15.

In the reaction: 2B ➡️Product; the rate equation is: Rate = k[B]. If the concentration of is doubled, the rate of reaction will increase by a multiple of

16 / 39

16.

In a reaction in which the rate of the reverse reaction is equal to the rate of the forward reaction, a state of ____________ is attained.

 

17 / 39

17.

The heat of combustion for 1 mole of carbon to carbon dioxide is -410 kJ. How many kJ of heat would be liberated from the complete combustion of 60.0 g of carbon?

18 / 39

18.

Calculate the standard entropy change for the following reaction, 2Ag2O(s) ➡️4 Ag(s) + O2(g); given S^{o}[Ag2O] = 121.3 J/K·mol, S^{o}[Ag(s)] = 42.6 J/K·mol, and S^{o}[O2(g)] = 205.1 J/K·mol.

 

19 / 39

19.

Which of the following statements about the kinetics of the reaction H2(g) + Br2(g) ➡️2HBr(g) is definitely true?

20 / 39

20.

For a reaction: 2H2+ 2NO ➡️2H2O + N2 the rate law is R = K [H2][NO]^2 The Order of the reaction is?

21 / 39

21.

All of the following statements concerning entropy are true EXCEPT

22 / 39

22.

A beaker with a mixture of ice and water is maintained at equilibrium: H2O(s) + heat➡️H2O(l); If the temperature of the system is decreased:

 

23 / 39

23.

Which of the following involves a decrease in entropy?

 

24 / 39

24.

Rusting of iron Is an example of________ reaction

25 / 39

25.

One mole of an ideal gas is heated at a constant pressure of 101300 N $m^{2}$, from 273.2 K to 373 K. Calculate the work involved R = 8.314 J/mol/K).

26 / 39

26.

The minimum additional energy, above the average internal energy, which the reacting molecules must possess so that their collision result in a reaction is known as

27 / 39

27.

The reactions catalyzed by sunlight are called ____________ reactions

28 / 39

28.

Calculate the standard entropy change for the following reaction, 2 Ag2O(s) ➡️4 Ag(s) + O2(g)

given S^{o}[Ag2O] = 121.3 J/K·mol, S^{o}[Ag(s)] = 42.6 J/K·mol, and S^{o}[O2(g)] = 205.1 J/K·mol.

 

29 / 39

29.

Of the following product-favoured processes, which are endothermic? 1. the combustion of methane to produce water and carbon dioxide. 2. the expansion of an ideal gas. 3. the melting of ice at temperatures greater than 0ºC.

30 / 39

30.

Which reaction is likely to have a negative change in entropy?

 

31 / 39

31.

Powdered marble reacts more rapidly with HCl than the chips of marble because:

32 / 39

32.

Predict the signs of 🔼H and 🔼S for the evaporation of water at 35 ^oC.

33 / 39

33.

The specific heat of silver is 0.0565 $cal/g/^{o}C$. Assuming no loss of heat to the surroundings or to the container, calculate the final temperature when 100 g of silver at 40 $^{o}C$ is immersed in 60 g of water at 10 $^{o}C$.

 

34 / 39

34.

A reaction with a negative value of 🔼G is said to be

35 / 39

35.

The first law of thermodynamics deals with

 

36 / 39

36.

If the reaction A + B C has an equilibrium constant greater than one, which of the following statements is correct?

37 / 39

37.

Milk sours more rapidly in summer than in winter because

38 / 39

38.

If a gas absorbs 1000 J of heat and expands by 0.5 $dm^{3}$ against a constant pressure of 4 atms (1 atm = 100000 Pa), then the change in internal energy is approximately

39 / 39

39.

If a process is exothermic and not spontaneous, then what must be true?

Your score is

The average score is 31%

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Please do well to drop a comment if this has really helped you. Thanks❤️

Ace/Undergragra

Ace aka Undergragra is a 500 Level Computer Engineering Student in the Federal University Oye-Ekiti. He is a passionate teacher,writer,educational consultant and educational informant.
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Mercy
Mercy
2 days ago

Pls how about for AEB

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