Question

1: What is the mass of 1.000 mol of HCl?

a: 1.01 g

b: 6 10²³ g

c: 35.45 g

d:

36.46 g

2: How many moles are present in 140. g of CaCl₂?

a: 15500 mol

b: 1.46 mol

c: 1.26 mol

d: 0.793 mol

3: How many moles of magnesium ions are present in 1.64 g of MgSO₄?

a: 0.734 mol

b: 1.64 mol

c: 120. mol

d: 0.0136 mol

6: A compound is found to consist of 2.89 g of calcium and 5.11 g of chlorine. What is the percent by mass of calcium in the compound?

a: 56.6%

b: 36.1%

c: 63.9%

d: 100%

7: What is the empirical formula of a compound that consists of 39.99% carbon, 6.73% hydrogen, and 53.28% oxygen?

a:CHO

b: C₂HO

c: CH₂O

d: CHO₂

8: What is the molecular formula of a compound with the empirical formula CH and molar mass of 26.04 g?

a: CH

b: C₂H

c: CH₂

d: C₂H₂

9: What is the empirical formula of a substance that contains 60.0% carbon, 4.48% hydrogen, and 35.52% oxygen?

a: C₂H₂O

b: C₃H₂O

c: C₄H₆O₂

d: C₉H₈O₄

10: Given the unbalanced equation: Al + CuSO₄ → Al₂(SO₄)₃ + Cu. When properly balanced, the sum of the balancing coefficients is

a: 6.

b: 7.

c: 8.

d: 9.

11: Given the unbalanced equation: C2H4 + O2 → CO2 + H2O. When properly balanced, the balancing coefficient of C2H4 is 

a: 0.

b: 1.

c: 2.

d: 3.

12: Given the unbalanced equation: Zn + HCl → ZnCl₂ + H₂. When properly balanced, the sum of the balancing coefficients is

a:4.

b: 5.

c: 6.

d: 7.

13: The following reaction: CH₄ + 2O₂ → CO₂ + H₂O, is an example of

a: combustion

b: decomposition.

c: single-displacement.

d: double-displacement.

14:The following reaction: Cl₂ + KBr → KCl + Br₂, is an example of

a: synthesis.

b: decomposition.

c: single-displacement.

d: double-displacement.

15: The following reaction: F₂ + 2KBr→ 2KF + Br₂, is an example of

a: combination.

b: decomposition.

c: single-displacement.

d: double-displacement.

16: The following reaction: hydrogen and oxygen producing water, is an example of

a: synthesis.

b: decomposition.

c: single-displacement.

d: double-displacement.

17: The following reaction: potassiumchlorate producing potassium chloride and oxygen, is an example of

a: combination.

b: decomposition.

c: single-displacement.

d: double-displacement.

18: Which of the following balanced reactions is the decomposition of potassium chlorate into potassium chloride and oxygen?

a: KClO₂ → KCl + O₂

b: KClO₃ → KCl + O₂

c: 2KClO₂ → 2KCl + 2O₂

d: 2KClO₃ → 2KCl + 3O₂

19: In the expression, 3CaBr₂,

a: 2 and 3 are subscripts

b: 2 and 3 are coefficients

c: 2 is a subscript and 3 is a coefficient

d: 3 is a subscript and 2 is a coefficient

21: The hydronium ion is responsible for the properties of

a:acids.

b: bases.

c: salts.

22: In an acidic solution the

a: concentration of hydronium ion is greater than that of hydroxide ion.

b: concentration of hydroxide ion greater than that of hydronium ion.

c: concentration of hydronium ion and hydroxide ion are equal.

23: Arrhenius defined an acid as a substance whose aqueous solution contains an excess of

a: sodium ion.

b: hydroxide ion.

c: chloride ion.

d: hydrogen ion.

24: Brønsted and Lowry defined an acid as a(n)

a: electron donor.

b: electron acceptor.

c: proton donor.

d: proton acceptor.

25: Which of the following is a strong electrolyte?

a: sulfuric acid

b: sulfurous acid

c: ammonia

d: acetic acid

26: Which of the following is a nonelectrolyte?

a: sugar

b: hypochlorous acid

c: sodium hydroxide

d: hydrosulfuric acid

27: Which of the following is a strong acid?

a:HNO₃

b: HNO₂

c: HClO

d: HClO₂ 

28: What is the conjugate acid of HS^- in the following equation?

               H₂S + H₂O _product___ HS ^- + H₃O ⁺

a: HS ^- 

b: H₂S 

c: H₃O ⁺

d: H₂O

29: What are the spectator ions when hydrochloric acid reacts with sodium hydroxide?

a: Na ⁺ and H ⁺

b: Cl ^- and OH ^-

c:H ⁺ and OH ^-

d: Na ⁺ and Cl ^-

30: What is the oxidation number of chlorine in HClO₄?

a: 0 

b: +7

c: -1

d: -3

31: What is the oxidation number of chromium in Cr2O72-?

a: +12

b: 0

c: +6

d: -4

32: What is the oxidation number of carbon in HCO3-  in? 

a: +5 

b: +4 

c: -1

d: -2

33: When a metal reacts with hydrochloric acid

a: a hydroxide is produced.

b: a new acid is produced.

c: hydrogen gas is produced.

d: a metal oxide is formed.

34: The reaction of Mg(OH)2 and HBr produces

a: MgOH and HBr.

b: MgH2 and HBrO.

c: H2O and MgBr2.

d: Mg(BrO)2 and MgH.

35: Which of the following combinations will not form a precipitate?

a: Pb(NO3)2 + NaCl

b: SnCl2 + KOH

c: FeCl2 + (NH4)2S

d: NH4Br + K2SO4