Question 1

Which of the following illustrates the balanced reaction between magnesium and oxygen to form magnesium oxide?

Accepted Answer

A)  Mg (s) + O (g) → MgO (s) 
B)  2 Mg (s) + O2 (g) → 2 MgO (s) 
C)  Mn (s) + O (g) → MnO (s) 
D)  2 Mn (s) + O2 (g) → 2 MnO (s) 
A)  Mg (s) + O (g) → MgO (s) 
B)  2 Mg (s) + O2 (g) → 2 MgO (s) 
C)  Mn (s) + O (g) → MnO (s) 
D)  2 Mn (s) + O2 (g) → 2 MnO (s) B

Question 2

Which of the following statements is not true.

Accepted Answer

A)  Biomass is formed in the conversion of CO2 and water into sugars. 
B)  The potential energy in biomass can be transformed into mechanical usages. 
C)  Biomass is a renewable practice 
D)  The breakdown of sugars releases H2 
A)  Biomass is formed in the conversion of CO2 and water into sugars. 
B)  The potential energy in biomass can be transformed into mechanical usages. 
C)  Biomass is a renewable practice 
D)  The breakdown of sugars releases H2 D

Question 3

What volume of a 1.00 M HCl solution is required to create 200 mL of a 0.250 M HCl solution?

Accepted Answer

A)  30.0 mL 
B)  50.0 mL 
C)  60.0 mL 
D)  75.0 mL 
A)  30.0 mL 
B)  50.0 mL 
C)  60.0 mL 
D)  75.0 mL B

Question 4

Given that: AgNO3 (aq) + KCl (aq) → AgCl (s) + KNO3 (aq) , which of the following species is classified as a spectator ion?

Accepted Answer

A)  Ag1+ (aq) 
B)  NO31 −  (aq) 
C)  AgCl (s) 
D)  Cl1 −  (aq) 
A)  Ag1+ (aq) 
B)  NO31 −  (aq) 
C)  AgCl (s) 
D)  Cl1 −  (aq)

Question 5

Which of the following illustrates the balanced reaction of iron and oxygen to form iron (II) oxide?

Accepted Answer

A)  Fe (s) + O (g) → FeO (s) 
B)  Fe2 (s) + O (g) → Fe2O (s) 
C)  2Fe (s) + O2 (g) → 2FeO (s) 
D)  4Fe (s) + 3O2 (g) → 2Fe2O3 (s) 
A)  Fe (s) + O (g) → FeO (s) 
B)  Fe2 (s) + O (g) → Fe2O (s) 
C)  2Fe (s) + O2 (g) → 2FeO (s) 
D)  4Fe (s) + 3O2 (g) → 2Fe2O3 (s)

Question 6

Which of the following substances is an example of a weak electrolyte?

Accepted Answer

A)  NaCl 
B)  Mg(NO3)2 
C)  KClO3 
D)  CH3COOH 
A)  NaCl 
B)  Mg(NO3)2 
C)  KClO3 
D)  CH3COOH

Question 7

Chemical equations are written to express the products of a reaction.

Accepted Answer

A) True 
 B)False

Question 8

Silver chloride is a soluble salt.

Accepted Answer

A) True 
 B)False

Question 9

The correct physical state subscript for substances dissolved in water is (w).

Accepted Answer

A) True 
 B)False

Question 10

Given that: CaCl2 (aq) + NaHCO3 (aq) → CaCO3 (s) + NaCl (aq) + HCl (aq) , which of the following species is classified as a spectator ion?

Accepted Answer

A)  Na1+ (aq) 
B)  CO32 −  (aq) 
C)  CaCO3 (s) 
D)  Ca2+ (aq) 
A)  Na1+ (aq) 
B)  CO32 −  (aq) 
C)  CaCO3 (s) 
D)  Ca2+ (aq)

Question 11

87.2 grams of IrCl3 contains ____ moles of the compound.

Accepted Answer

A)  7.65 
B)  3.41 
C)  0.0819 
D)  0.292 
A)  7.65 
B)  3.41 
C)  0.0819 
D)  0.292

Question 12

An unknown hydrocarbon is subjected to elemental analysis. The results of this test show that the compound is 83.24% carbon and 16.76% H. With a molar mass of 72 g/mole, the molecular formula of this compound is:

Accepted Answer

A)  C4H10 
B)  C5H10 
C)  C5H12 
D)  C6H14 
A)  C4H10 
B)  C5H10 
C)  C5H12 
D)  C6H14

Question 13

If 225.6 grams of silver chloride are produced in a precipitation reaction, how many moles of the salt have been formed?

Accepted Answer

A)  1.574 × 100 
B)  4.403 × 101 
C)  1.039 × 101 
D)  9.471 × 10 − 1 
A)  1.574 × 100 
B)  4.403 × 101 
C)  1.039 × 101 
D)  9.471 × 10 − 1

Question 14

Given that: Pb(ClO3)2 (aq) + KBr (aq) → PbBr2 (s) + KClO3 (aq) , which of the following species is classified as a spectator ion?

Accepted Answer

A)  Pb2+ (aq) 
B)  ClO41 −  (aq) 
C)  K1+ (aq) 
D)  Br1 −  (aq) 
A)  Pb2+ (aq) 
B)  ClO41 −  (aq) 
C)  K1+ (aq) 
D)  Br1 −  (aq)

Question 15

There are eight oxygen atoms in one molecule of calcium phosphate.

Accepted Answer

A) True 
 B)False

Question 16

A solution of 2.5 M Ba2+ can be prepared by dissolving 583 grams of barium sulfate in one liter of water.

Accepted Answer

A) True 
 B)False

Question 17

The potential of biomass is related to the enormous amounts of solar energy impinging on the Earth each second.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following substances is an example of a strong electrolyte?

Accepted Answer

A)  C6H12O6 
B)  KNO3 
C)  Ag2SO4 
D)  C4H10 
A)  C6H12O6 
B)  KNO3 
C)  Ag2SO4 
D)  C4H10

Question 19

How many oxygen atoms are present in 6 molecules of Ce(NO2)3?

Accepted Answer

A)  6 
B)  18 
C)  36 
D)  54 
A)  6 
B)  18 
C)  36 
D)  54

Question 20

Which of the following may be classified as an example of an acid-base reaction?

Accepted Answer

A)  HCl + NaOH → H2O + NaCl 
B)  Ca(NO3)2 + H2SO4 → CaSO4 + HNO3 
C)  KClO4 + NaF → NaClO4 + KF 
D)  HCOOH + NH4Cl → NH4COOH + HCl 
A)  HCl + NaOH → H2O + NaCl 
B)  Ca(NO3)2 + H2SO4 → CaSO4 + HNO3 
C)  KClO4 + NaF → NaClO4 + KF 
D)  HCOOH + NH4Cl → NH4COOH + HCl

Which of the following illustrates the balanced reaction between magnesium and oxygen to form magnesium oxide?

Which of the following statements is not true.

What volume of a 1.00 M HCl solution is required to create 200 mL of a 0.250 M HCl solution?

Given that: AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃ (aq) , which of the following species is classified as a spectator ion?

Which of the following illustrates the balanced reaction of iron and oxygen to form iron (II) oxide?

Which of the following substances is an example of a weak electrolyte?

Chemical equations are written to express the products of a reaction.

Silver chloride is a soluble salt.

The correct physical state subscript for substances dissolved in water is _(w).

Given that: CaCl₂ (aq) + NaHCO₃ (aq) → CaCO₃ (s) + NaCl (aq) + HCl (aq) , which of the following species is classified as a spectator ion?

87.2 grams of IrCl₃ contains ____ moles of the compound.

An unknown hydrocarbon is subjected to elemental analysis. The results of this test show that the compound is 83.24% carbon and 16.76% H. With a molar mass of 72 g/mole, the molecular formula of this compound is:

If 225.6 grams of silver chloride are produced in a precipitation reaction, how many moles of the salt have been formed?

Given that: Pb(ClO₃)₂ (aq) + KBr (aq) → PbBr₂ (s) + KClO₃ (aq) , which of the following species is classified as a spectator ion?

There are eight oxygen atoms in one molecule of calcium phosphate.

A solution of 2.5 M Ba²⁺ can be prepared by dissolving 583 grams of barium sulfate in one liter of water.

The potential of biomass is related to the enormous amounts of solar energy impinging on the Earth each second.

Which of the following substances is an example of a strong electrolyte?

How many oxygen atoms are present in 6 molecules of Ce(NO₂)₃?

Which of the following may be classified as an example of an acid-base reaction?

Introduction to Chemistry

Atoms and Molecules

Stoichiometry

Gases

The Periodic Table and Atomic Structure

Chemical Bonding and Molecular Structure

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Entropy and the Second Law of Thermodynamics

Chemical Kinetics

Chemical Equilibrium

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Exam 3: Molecules Moles Chemical Equations

Which of the following illustrates the balanced reaction between magnesium and oxygen to form magnesium oxide?

Which of the following statements is not true.

What volume of a 1.00 M HCl solution is required to create 200 mL of a 0.250 M HCl solution?

Given that: AgNO3 (aq) + KCl (aq) → AgCl (s) + KNO3 (aq) , which of the following species is classified as a spectator ion?

Which of the following illustrates the balanced reaction of iron and oxygen to form iron (II) oxide?

Which of the following substances is an example of a weak electrolyte?

Chemical equations are written to express the products of a reaction.

Silver chloride is a soluble salt.

The correct physical state subscript for substances dissolved in water is (w).

Given that: CaCl2 (aq) + NaHCO3 (aq) → CaCO3 (s) + NaCl (aq) + HCl (aq) , which of the following species is classified as a spectator ion?

87.2 grams of IrCl3 contains ____ moles of the compound.

An unknown hydrocarbon is subjected to elemental analysis. The results of this test show that the compound is 83.24% carbon and 16.76% H. With a molar mass of 72 g/mole, the molecular formula of this compound is:

If 225.6 grams of silver chloride are produced in a precipitation reaction, how many moles of the salt have been formed?

Given that: Pb(ClO3)2 (aq) + KBr (aq) → PbBr2 (s) + KClO3 (aq) , which of the following species is classified as a spectator ion?

There are eight oxygen atoms in one molecule of calcium phosphate.

A solution of 2.5 M Ba2+ can be prepared by dissolving 583 grams of barium sulfate in one liter of water.

The potential of biomass is related to the enormous amounts of solar energy impinging on the Earth each second.

Which of the following substances is an example of a strong electrolyte?

How many oxygen atoms are present in 6 molecules of Ce(NO2)3?

Which of the following may be classified as an example of an acid-base reaction?

Introduction to Chemistry

Atoms and Molecules

Stoichiometry

Gases

The Periodic Table and Atomic Structure

Chemical Bonding and Molecular Structure

Molecules and Materials

Energy and Chemistry

Entropy and the Second Law of Thermodynamics

Chemical Kinetics

Chemical Equilibrium

Electrochemistry

Filters

Given that: AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃ (aq) , which of the following species is classified as a spectator ion?

The correct physical state subscript for substances dissolved in water is _(w).

Given that: CaCl₂ (aq) + NaHCO₃ (aq) → CaCO₃ (s) + NaCl (aq) + HCl (aq) , which of the following species is classified as a spectator ion?

87.2 grams of IrCl₃ contains ____ moles of the compound.

Given that: Pb(ClO₃)₂ (aq) + KBr (aq) → PbBr₂ (s) + KClO₃ (aq) , which of the following species is classified as a spectator ion?

A solution of 2.5 M Ba²⁺ can be prepared by dissolving 583 grams of barium sulfate in one liter of water.

How many oxygen atoms are present in 6 molecules of Ce(NO₂)₃?