1: What is the mass of 1.000 mol of HCl? a: 1.01 g b: 6 10 23 g c: 35.45 g d: 36.46 g 2: How many moles are present in 140. g of CaCl 2 ?
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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: H2

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

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