Chemistry Test Questions for the Course Credit

1. The mole is a unit of measurement of

• a) mass of a substance
• b) volume of a substance
• c) amount of a substance

2. A chemical equation of a reaction reflects

• a) Avogadro's law
• b) the law of conservation of mass
• c) the law of definite composition

3. Which of the listed oxides can react with water?

• a) K₂ O
• b) Al₂O₃
• c) SiO₂

4. Identify the neutralization reaction

• a) Zn+H₂SO₄ → ZnSO₄+H₂↑
• b) NaOH+HCl → NaCl+H₂O
• c) CaO+ H₂O → Ca(OH)₂

5. The molar mass of H₂SO₄ is

• a) 98 g/mol
• b) 100 a.m.u.
• c) 160 g

6. Indicate the valence of sulfur in H₂SO₄

• a) II
• b) IV
• c) VI

7. Determine the simplest formula of a substance consisting of 50% sulfur and 50% oxygen. Support your answer with a calculation.

• a) SO
• b) SO₂
• c) SO₃

8. Which of the listed reactions are redox reactions?

• a) H₂+Br₂=2HBr
• b) NH₄Cl=NH₃+HCl
• c) 2NaOH+H₂SO₄=Na₂SO₄+H₂O
• d) 4Al+3O₂=2Al₂O₃

9. In which of the listed transformations does oxygen act as a reducing agent?

• a) Ag₂O→Ag+O₂
• b) F₂+H₂O→HF+O₂
• c) NH₃+O₂→N₂+H₂O
• d) AgNO₃+KOH+H₂O₂→Ag+KNO₃+O₂

10. In which direction will the chemical equilibrium of the acetylene combustion reaction 2C₂H₂ + 5O₂ = 4CO₂ + 2H₂O shift when the pressure is increased?

• a) to the right
• c) to the left
• d) it will not shift