Sample Test - Chemistry

S. C. Jiménez
Quiz by S. C. Jiménez, updated more than 1 year ago
S. C. Jiménez
Created by S. C. Jiménez over 2 years ago
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Sample Test of Chemistry

Resource summary

Question 1

Question
A sample of N₂ gas occupies 4.48 L of volume under standard condition (1 atm, 0℃). What is the mass of the given sample? The atomic mass of N is 14 amu.
Answer
  • 5.6g
  • 56g
  • 2.8g
  • 28g
  • 22.4g

Question 2

Question
Which of the following properties are characteristic for the "nonmetals?" I. high electrical conductivity II. large ionization energy III. high electronegativity IV. low electron affinity
Answer
  • I and II
  • II and III
  • III and IV
  • II and IV
  • I, II, and III

Question 3

Question
Concerning 1.2 x 10²⁴ CO₂ molecules, and the molar mass is 44g ⁄ mol. Which of the following is/are true? I. it is 12 moles II. it occupies 1.2 x 22.4 L volume under standard conditions III. it has a mass of 88 grams IV. it consists of 3.6 x 10²⁴ atoms
Answer
  • I and III
  • I and IV
  • II and III
  • II and IV
  • III and IV

Question 4

Question
Which of the substances above contain covalent bond only? I. BaCl₂ (aq) II. CCl₄ (l) III. HCl (g) IV. NH₄Br (aq)
Answer
  • all of them
  • I, II, and IV
  • II and III
  • I and III
  • II, III, and IV

Question 5

Question
Which of the following atoms are isotopes of each other? X: 11 protons, 11 electrons, 12 neutrons Y: 11 protons, 10 electrons, 12 neutrons V: 11 protons, 11 electrons, 13 neutrons W: 12 protons, 12 electrons, 12 neutrons
Answer
  • X and Y
  • X and W
  • Y and V
  • V and W
  • X and V

Question 6

Question
An aqueous solution is prepared by dissolving 1.6g NaOH in 250 mL final volume. What is the molar concentration of the solution? (*The molar mass of NaOH is 40g/mol.)
Answer
  • 6.4 mol/L
  • 1.6 mol/L
  • 16 mol/L
  • 0.16 mol/L
  • 64 mol/L

Question 7

Question
Which of the following changes of conditions will shift the equilibrium of the reaction to the right? N₂ (g) + 3H₂ (g) ⇌ 2NH₃ (g) ; the reaction is exothermic towards product formation I. increase the pressure II. increase the concentration of NH₃ III. increase the concentration of H₂ (g) IV. decrease the temperature
Answer
  • I, III, and IV
  • II and III
  • II and IV
  • II, III, and IV
  • all of them

Question 8

Question
Which of the compounds above will be produced when two elements, X (atomic number 13) and Y (atomic number 8), react together? I. XY II. X₃Y₂ III. XY₂ IV. X₂Y V. X₂Y₃
Answer
  • I
  • II
  • III
  • IV
  • V

Question 9

Question
Which of the solutions above is most basic? I. pH=11 II. pOH=12 III. pOH=2 IV. [OH⁻] = 10⁻⁴ mol ⁄ L V. [H⁺] = 10⁻⁴ mol ⁄ L
Answer
  • I
  • II
  • III
  • IV
  • V

Question 10

Question
Which one of the sets below contains only polar molecules? I. NH₃, H₂O, SO₂ II. SO₃, H₂S, H₂O III. HCl, CO₂, NH₃ IV. Cl₂, SO₂, CO₂ V. CCl₄, H₂O, NH₃
Answer
  • I
  • II
  • III
  • IV
  • V

Question 11

Question
Which of the following statements are correct descriptions about the calcium atom, "in any reaction where a calcium atom changes to calcium ion?" I. it loses an electron II. it becomes an anion III. it is oxidized IV. it achieves noble gas electron configuration
Answer
  • I and II
  • II and III
  • III and IV
  • II and IV
  • II, III, and IV

Question 12

Question
What can be the oxidation number of Cr in the given compound? K₂Cr₂O₇
Answer
  • -6
  • +6
  • +12
  • -12
  • +2

Question 13

Question
Which of the following has the greatest first ionization energy?
Answer
  • halogens
  • carbon family
  • oxygen family
  • alkali metals
  • alkaline earth metals

Question 14

Question
Aqueous solutions of the five compounds below have the same molar concentration. I. CH₃COOH, HCl, NaCl, NH₃, KOH II. KOH, NH₃, NaCl, CH₃COOH, HCl III. HCl, CH₃COOH, NaCl, NH₃, KOH IV. HCl, CH₃COOH, NH₃, KOH, NaCl V. CH₃COOH, HCl, KOH, NaCl, NH₃ Which of the above correctly shows "the increasing order of pH among those aqueous solutions?"
Answer
  • I
  • II
  • III
  • IV
  • V

Question 15

Question
How much of solid potassium chloride is required to prepare 200 mL solution with 15% m/m concentration? (*The density of the solution is 1.2 g/mL.)
Answer
  • 25g
  • 0.25g
  • 360g
  • 36g
  • 0.09g

Question 16

Question
Which of the following are the oxidation-reduction reactions? I. 2Na (s) + 2H₂O (l) ➝ 2NaOH (aq) + H₂ (g) II. 2NaOH (aq) + H₂SO₄ (aq) ➝ Na₂SO₄ (aq) + 2H₂O (l) III. Ca²⁺ (aq) + CO₃²⁻ (aq) ➝ CaCO₃ (s) IV. H₂ (g) + Cl₂ (g) ➝ 2HCl (g)
Answer
  • all of the above
  • I and II
  • III and IV
  • I and III
  • I and IV

Question 17

Question
Which of these is a compound with an ester group?
Answer
  • I
  • II
  • III
  • IV
  • V

Question 18

Question
Which of these pairs here are "structural isomers?"
Answer
  • I and II
  • II and III
  • I, III, and IV
  • II, III, and IV
  • all of them

Question 19

Question
Which of the compounds is the main product of the given reaction? H₃C⎯CH⚌CH₂ + H⎯Br ➝ ▢
Answer
  • A
  • B
  • C
  • D
  • E

Question 20

Question
Which of the following statements are correct for the given molecule above in its open chain form? I. it is an aldopentose II. it has 4 chiral carbon atoms III. it is a monosaccharide IV. it is a D-sugar
Answer
  • I and III
  • II and IV
  • III and IV
  • I, II, and III
  • I, III, and IV
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