[Placement Test] CU-ATS Chemistry2022
20 Questions, 25 Minutes
The use of a calculator is permitted.
20 Questions, 25 Minutes
The use of a calculator is permitted.
1. From the list of standard electrode potentials shown below, what is the strongest oxidizing and reducing reagents?
VO2++ 2H+ + e- ⇌ V3+ + H2O Eo = + 0.34 V
S2O32- + 6H+ + 4e- ⇌ 2S + 3H2O Eo = + 0.47 V
ClO- + H2O + 2e- ⇌ Cl- + 2OH- Eo = + 0.89 V
VO2+ + 2H+ + e- ⇌ VO2+ + H2O Eo = + 1.00 V
|
Strongest oxidizing agent |
Strongest reducing agent |
|
| 1) |
VO2+ |
S2O32- |
| 2) |
S2O32- |
VO2+ |
| 3) |
VO2+ |
ClO- |
| 4) |
ClO- |
V3+ |
| 5) |
VO2+ |
V3+ |
1)
2)
3)
4)
5)
2. The graph above shows a relationship between vapor pressure and the temperature of ether, water, and mercury. Which substance has the lowest surface tension?
1) Diethyl ether
2) Water
3) Mercury
4) More than two substances have the same lowest surface tension.
5) Insufficient information
3. A student carried out an experiment to determine the rate equation of the following reaction;
A + B → C
The results are shown in the table.
|
Experiment |
[A], M |
[B], M |
Initial rate of reaction |
|
1 |
1.00 x 10-4 |
1.00 x 10-4 |
2.00 x 10-4 |
|
2 |
3.00 x 10-4 |
2.00 x 10-4 |
6.00 x 10-4 |
|
3 |
1.00 x 10-4 |
2.00 x 10-4 |
2.00 x 10-4 |
Which of the following graphs shows a correct relationship between rate, concentration, and time when concentration of A is kept constant?
3. A student carried out an experiment to determine the rate equation of the following reaction;
A + B → C
The results are shown in the table.
|
Experiment |
[A], M |
[B], M |
Initial rate of reaction |
|
1 |
1.00 x 10-4 |
1.00 x 10-4 |
2.00 x 10-4 |
|
2 |
3.00 x 10-4 |
2.00 x 10-4 |
6.00 x 10-4 |
|
3 |
1.00 x 10-4 |
2.00 x 10-4 |
2.00 x 10-4 |
Which of the following graphs shows a correct relationship between rate, concentration, and time when concentration of A is kept constant?
1) (1) and (3)
2) (1) and (4)
3) (2) and (3)
4) only (4)
5) All of the above is not correct.
4. A balloon has a volume of 20.0 dm3 at the mean sea level (1 atm and 27 °C). It rises to the top of the mountain, which is 1 km higher from the mean sea level, and explodes. At the top of the mountain, the external pressure is 0.5 atm and the temperature reduces to -23 °C. What is the largest volume of the balloon at the top of the mountain?
1) 16.7 dm3
2) 33.3 dm3
3) 66.7 dm3
4) 133.3 dm3
5) 333.3 dm3
5. What is the pH value of basic salt of 1.0 M Na2X, when Ka1 and Ka2 of H2X = 10-8 and 10-10, respectively?
1) 8
2) 9
3) 10
4) 11
5) 12
6. Which of the following substances has the highest boiling point? (Relative atomic mass of H = 1, C = 12, O = 16)
1) 0.25 g of Lactose (C12H22O11) in 100 cm3 of water
2) 0.25 g of Galactose (C6H12O6) in 50 cm3 of water
3) 0.25 g of Ribose (C5H10O5) in 25 cm3 of water
4) Pure water
5) All of the above are equal boiling points.
7. A reversible reaction A + B ⇌ 2C has the equilibrium constant, K, equals to 9. A and B have the same initial concentrations of 0.02 M. What is the concentration of B at equilibrium?
1) 0.0012 M
2) 0.008 M
3) 0.01 M
4) 0.012 M
5) 0.022 M
8. Dimethandrolone undecanoate (DMAU) is a compound being developed for use as a potential male hormonal contraceptive, specifically as a birth control pill for men. From the molecular structure of DMAU shown below, which geometry can be found the most in carbon atoms of this molecule?
1) Linear
2) Bent
3) Trigonal planar
4) Trigonal bipyramidal
5) Tetrahedral
9. A student carried out an experiment by adding an unknown substance B to a test-tube containing Benedict’s solution. When the test-tube was heated, the solution remained blue. In a separate test-tube containing dilute hydrochloric acid, substance B was added to the test-tube, which was then heated in boiling water for 10 minutes. The solution was neutralised before being added to a test-tube containing Benedict’ solution, which was then heated. Brick red precipitates were observed. What could the unknown B be?
1) Honey
2) Milk
3) Corn syrup
4) Tapioca flour
5) None of the above
10. Element X has a relative atomic mass 14 times greater than that of tritium and the number of neutrons 22 times greater than that of deuterium. What is the property of the oxide of X?
1) Acidic
2) Basic
3) Neutral
4) Amphoteric
5) None of the above
11. What is the electronic configuration of cobalt in the compound [Co(NH3)4SO4]NO3?
(Proton number of Co = 27)
1) [Ar] 3d5
2) [Ar] 3d6
3) [Ar] 3d7
4) [Ar] 3d8
5) [Ar] 4s2
12. The diagram above shows an apparatus used to determine the density of a piece of metal.
12. The diagram above shows an apparatus used to determine the density of a piece of metal.
What is the density, in the unit of kg m-3, of this metal with the mass of 31.5 g?
1) 3.15 kg m-3
2) 6.3 kg m-3
3) 3,150 kg m-3
4) 6,300 kg m-3
5) 630 kg m-3
13. The table below shows some radioisotopes with their half-life.
|
Radioisotope |
Half-life (days) |
|
Cobalt-57 |
271.79 |
|
Einsteinium-254 |
275.7 |
|
Berkelium-249 |
330 |
|
Californium-248 |
333.5 |
Mass of oisotope Z decreases from 5.44 g to 0.34 g after 3.655 years.
Given that a year has 365 days. What is the identity of the radioisotope Z?
1) Cobalt-57
2) Einsteinium-254
3) Berkelium-249
4) Californium-248
5) Calcium-42
14. Which five gases are compressed into each balloon which contains 2 liters. Which one of the following gases makes the balloons still the largest size when hanging each balloon at room temperature after passing two weeks? (Relative atomic mass of H = 1, He = 4, Ne = 10, N = 14, O = 16, Ne = 20)
1) O2
2) N2
3) He
4) Ne
5) H2
15. Which of the following statements about absolute zero is NOT TRUE?
1) The absolute zero is the temperature at which molecular motion ceases.
2) The absolute zero is the temperature where nothing could be colder and no heat energy remains in a substance.
3) The temperature at absolute zero is -273.15 °C or 0 K.
4) The entropy of all substances at absolute zero is exactly equal to zero.
5) All of the above is true.
16. What is the major difference between DNA and RNA?
1) Base
2) Sugar
3) Phosphate
4) Hydrogen bond
5) London dispersion force
17. Which of the following is the molecular formula C7H10?
0%
0
1)
0%
0
2)
0%
0
3)
0%
0
4)
0%
0
5)
18. Which of the following pairs of substances can form a buffer solution when being mixed?
1) CH3COOH and NaOH
2) CH3COOH and HCOOH
3) HClO3 and KOH
4) HClO4 and NaClO4
5) None of the above
19. What is the chemical formula of limestone?
1) CaCO3
2) CaSO4
3) Ca3(PO4)2
4) CaO
5) Ca(OH)2
20. Consider the following reaction;
2A + (5/2)B2 → A2B5
If the rate of formation of A2B5 is r M/s, what is the rate at which B2 is consumed?
1) 5r/2
2) 2r/5
3) 2r
4) 5r
5) 4r/5
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