Placement Test TBAT Chemistry 2024

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Placement Test TBAT Chemistry 2024
 
TBAT Placement Test
 This TBAT placement will provide students with the suggestion of whether they should enroll in the Intensive TBAT course of each subject knowledge before enrolling in the respective TBAT marathon course as part of their preparation for the Thai Biomedical Admissions Test (TBAT). As the official TBAT is an emerging test, this placement testmakes use of the official exam blueprint and prior familiarity with tests from Chulalongkorn University Academic Testing Center to gauge students' readiness.
Placement Test TBAT Chemistry 2024
 
TBAT Placement Test
 This TBAT placement will provide students with the suggestion of whether they should enroll in the Intensive TBAT course of each subject knowledge before enrolling in the respective TBAT marathon course as part of their preparation for the Thai Biomedical Admissions Test (TBAT). As the official TBAT is an emerging test, this placement testmakes use of the official exam blueprint and prior familiarity with tests from Chulalongkorn University Academic Testing Center to gauge students' readiness.

Question 1

A brand of fruit snacks claims that each bag of fruit snacks has a mass of 35.5 g. Wyatt observes the masses as 35.5 g, 35.6 g, and 36.1 g. On the other hand, Fabio observes the masses as 34.6 g, 34.7 g, and 34.9 g. Which of the following is true regarding the accuracy and precision of their results?
1) Wyatt’s results are both accurate and precise.
2) Fabio’s results are precise but not accurate.
3) Wyatt’s results are more precise than Fabio’s.
4) Fabio’s results are more accurate than Wyatt’s.
5) Both of their results are accurate but not precise.

Question 2

This question concerns safety measures in the laboratory. What would you use to wash your hand immediately, if a solution of concentrated acid splashed on your hand?
1) Soap
2) Alcohol
3) Weak base
4) Plenty of water
5) Wait to see the doctor

Question 3

Which of the following has the lowest oxidation number of Cl?

1) ClO2
2) KClO4
3) Cl2
4) [FeCl4]−
5) NaClO3

Question 4

Several chemical reactions have occurred apparently. Which of the following reactions give the product as solid?

 

  1. The reaction of lithium and excess water at room temperature.
  2. The reaction of 100 mL of calcium chloride and 100 mL of potassium nitrate solution in a beaker.
  3. The decomposition reaction of heating limestone.
  4. The reaction of 0.50 M potassium bromide solution and 0.50 M lead(II) nitrate solution.
1) I and II
2) II and III
3) III and IV
4) II and IV
5) I and III

Question 5

The figure below shows an experimental setup of the gold foil experiment, which was originally performed by Ernest Rutherford, Hans Geiger, and Ernest Marsden. In the experiment, positively charged alpha particles were beamed through a thin gold foil. It was found that most of the alpha particles went straight through the gold foil without deflection, but some were deflected with an angle greater than 90° from their original path. Which of the following statements can be concluded from the results?
 
1) The charge of a proton is 1.60×10-19 coulombs.
2) Neutrons do not have electric charges.
3) Electrons are present in the atom.
4) The nucleus of an atom contains neutrons and protons.
5) An atom is made up of mostly empty space.

Question 6

Which standard notation indicating the electron configurations of atoms is impossible?
1) 5f12
2) 4d6
3) 3f3
4) 2s1
5) 6p2

Question 7

Which of the following is NOT CORRECT about elements in group 13?
1) Valence electrons of these elements are in p orbitals.
2) Metal, non-metal, and metalloid can all be found in this group.
3) Some oxides of group 13 elements are amphoteric.
4) Aluminium has lower first ionization energy compared to a group 2 element in the same period.
5) None of the above

Question 8

AxBy is the molecular formula of a binary compound. The solid state of AxBy has a high boiling point and electrical conductivity when dissolved or melted. Which of the following atoms are A and B?
1) Boron and oxygen
2) Carbon and hydrogen
3) Oxygen and hydrogen
4) Beryllium and oxygen
5) Sodium and chloride

Question 9

What is the shape of chlorine trifluoride according to the VSEPR model?
1) Trigonal planar
2) T-shaped
3) Tetrahedral
4) Square planar
5) Trigonal bipyramidal

Question 10

Given the functional group compound
 
 
Which functional group is NOT found in this molecule?
1) Ketone
2) Aldehyde
3) Amide
4) Amine
5) Alcohol

Question 11

A 12-mole mixture of oxygen and carbon dioxide has a total mass of 480 g. How many moles of carbon dioxide are present in the mixture? (Relative atomic mass of C = 12, O = 16)

1) 4
2) 5
3) 6
4) 7
5) 8

Question 12

Ammonium chloride (NH4Cl) is mostly found around some types of volcanic vents. When a soil sample taken from the volcanic region is dissolved in water and the solution is diluted to a volume of 4 dm3, it is found that the molar concentration of NH4Cl is 5.0 × 10–4 mol/dm3. What is the concentration in ppm of NH4Cl in the solution? (Relative atomic mass of H = 1, N = 14, Cl = 35.5, and density of water = 1 g/cm3)
1) 0.027
2) 0.107
3) 26.75
4) 50.825
5) 107

Question 13

108.0 g of magnesium was reacted with excess oxygen, according to the following reaction: 2Mg + O2 → 2MgO, 150.0 g of magnesium oxide was collected. What is the theoretical yield, and percent yield respectively? (Relative atomic mass of O = 16 and Mg = 24)
1) 160 g, 93.75%
2) 180 g, 83.33%
3) 200 g, 75.00%
4) 220 g, 68.18%
5) 240 g, 83.33%

Question 14

The density of X2 gas in STP is 1.25 g/L. What is an X atom? Given the universal gas constant, R = 0.082 atm·L·mol-1·K-1.
1) Fluorine
2) Hydrogen
3) Chlorine
4) Oxygen
5) Nitrogen

Question 15

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 two weeks? (Relative atomic mass of H=1, He=4, N=14, O=16, and Ne=20)
1) O2
2) N2
3) He
4) Ne
5) H2

Question 16

An unknown hydrocarbon is combusted with excess oxygen to produce 18.0 g of water and 22.4 dm3 of carbon dioxide (at 0 °C and 1 atm). What is the stoichiometric ratio of the unknown hydrocarbon to O2 to CO2 to H2O?
(Relative mass of H = 1, C = 12, O = 16, unknown hydrocarbon = 42)
1) 2 : 3 : 2 : 2
2) 1 : 3 : 2 : 2
3) 2 : 9 : 6 : 6
4) 1 : 6 : 4 : 4
5) 4 : 3 : 2 :5

Question 17

A reacts with B, resulting in C. The moles of reagents are measured at the time and reported in the table below.
 
 

What is the balanced equation, and how long does it take to complete the reaction?

1) A + 2B → 2C, 13 min
2) 3A + 2B → C, 13 min
3) 3A + 2B → C, 10 min
4) A + 2B → 2C, 10 min
5) A → 2C, 13 min

Question 18

The rate law of the chemical equation:

2ICl (g) + H2 (g) → I2 (g) + 2HCl (g)

 

Which one is the reaction rate (R) when the initial concentration of ICl and H2 gas is equal to 0.20 M?

1) 0.00012
2) 0.00060
3) 0.0012
4) 0.0060
5) 0.012

Question 19

Which one of the chemical reactions below is shifted to the product when the equilibrium is increased by the pressure?
1) 2NO(g) + Cl2(g) ⇌ 2NOCl(g)
2) H2(g) +I2(g) ⇌ 2HI(g)
3) CaCO3(s) ⇌ CaO(s) + CO2(g)
4) N2O4(g) ⇌ 2NO2(g)
5) H2O(l) ⇌ H2O(g)

Question 20

For a reversible reaction SO2Cl2 ⇌ SO2 + Cl2, the equilibrium constant (Kc) is
1.44 x 10-3 mol dm-3. At equilibrium, 27.0 g of SO2Cl2 was found in the container that has the volume of 2.00 dm3. What is the initial amount of SO2Cl2? (Relative atomic mass of O = 16, S = 32, Cl = 35.5)
1) 28.2 g
2) 29.2 g
3) 30.2 g
4) 31.2 g
5) 32.2 g
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