Question 1

The greatest challenge facing biomass for energy needs is:

Accepted Answer

A)  the creation of sugars from carbon dioxide and water 
B)  finding the means to tranform the biomass energy into a sufficient energy density 
C)  production of fixed nitrogen 
D)  soil quality 
A)  the creation of sugars from carbon dioxide and water 
B)  finding the means to tranform the biomass energy into a sufficient energy density 
C)  production of fixed nitrogen 
D)  soil quality

Question 2

Acids and bases react to give noxious gases and oxides

Accepted Answer

A) True 
 B)False

Question 3

Barium sulfate is a strong electrolyte

Accepted Answer

A) True 
 B)False

Question 4

Which of the following illustrates the balanced reaction of ethyl alcohol with an excess of oxygen to form carbon dioxide and water?

Accepted Answer

A)  C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 3 H2O (l) 
B)  3 C2H5OH (l) + 7 O2 (g) → 6 CO2 (g) + 9 H2O (l) 
C)  C2H5OH (l) + 2 O2 (g) → 3 CO2 (g) + 3 H2O (l) 
D)  3 C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 6 H2O (l) 
A)  C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 3 H2O (l) 
B)  3 C2H5OH (l) + 7 O2 (g) → 6 CO2 (g) + 9 H2O (l) 
C)  C2H5OH (l) + 2 O2 (g) → 3 CO2 (g) + 3 H2O (l) 
D)  3 C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 6 H2O (l)

Question 5

Thirty moles of hydrogen and 14 moles of oxygen should react to produce 252 grams of water and 2 grams of hydrogen.

Accepted Answer

A) True 
 B)False

Question 6

This reaction: C7H16 + 11 O2 → 7 CO2 + 8 H2O represents the complete combustion of heptane.

Accepted Answer

A) True 
 B)False

Question 7

If 92.8 grams of sodium nitrite is dissolved in sufficient water to prepare 2.3 L of water, the resulting solution has a molarity of:

Accepted Answer

A)  1.34 M 
B)  0.890 M 
C)  0.58 M 
D)  1.92 M 
A)  1.34 M 
B)  0.890 M 
C)  0.58 M 
D)  1.92 M

Question 8

In the reaction between Fe and CuCl2, the following statement is true:

Accepted Answer

A)  One mole of Fe and two moles of CuCl2 react without excess remaining 
B)  Two moles of Fe with excess CuCl2 will plate one mole of Cu 
C)  These two compounds react to form solid FeCl3 and Cu2+ 
D)  Chloride is a spectator ion 
A)  One mole of Fe and two moles of CuCl2 react without excess remaining 
B)  Two moles of Fe with excess CuCl2 will plate one mole of Cu 
C)  These two compounds react to form solid FeCl3 and Cu2+ 
D)  Chloride is a spectator ion

Question 9

The Law of Conservation of Matter can be interpreted correctly to mean that atoms of one element are neither created nor destroyed in a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 10

How many oxygen atoms are present in 5 molecules of CuSO4   5H2O?

Accepted Answer

A)  45 
B)  50 
C)  25 
D)  20 
A)  45 
B)  50 
C)  25 
D)  20

Question 11

If the solubility of NaCl in water is 35.7g NaCl / 100g H2O, what is the minimal volume of water needed to dissolve 100 grams of the salt?

Accepted Answer

A)  36 mL 
B)  140 mL 
C)  280 mL 
D)  661 mL 
A)  36 mL 
B)  140 mL 
C)  280 mL 
D)  661 mL

Question 12

Given that: 2 H2( g ) + O2( g ) → 2 H2O( g ), four moles of hydrogen should react with appropriate oxygen to produce 2 moles of water.

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A)  sucrose 
B)  table salt 
C)  asphalt 
D)  corn starch 
A)  sucrose 
B)  table salt 
C)  asphalt 
D)  corn starch

Question 14

A "neon" sign contains 2.4 × 102 mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign?

Accepted Answer

A)  6.5 × 1021 
B)  2.8 × 1022 
C)  3.2 × 1024 
D)  9.9 × 10 − 23 
A)  6.5 × 1021 
B)  2.8 × 1022 
C)  3.2 × 1024 
D)  9.9 × 10 − 23

Question 15

Sodium nitrate is a strong electrolyte.

Accepted Answer

A) True 
 B)False

Question 16

How many aluminum atoms are present in 4 molecules of AlCl3?

Accepted Answer

A)  1 
B)  3 
C)  4 
D)  12 
A)  1 
B)  3 
C)  4 
D)  12

Question 17

Potassium permanganate is a soluble salt.

Accepted Answer

A) True 
 B)False

Question 18

How many atoms are contained in 5.99 × 10 − 14 moles of glucose (C6H12O6)?

Accepted Answer

A)  2.42 × 1038 
B)  8.66 × 1011 
C)  1.84 × 1021 
D)  3.61 × 1010 
A)  2.42 × 1038 
B)  8.66 × 1011 
C)  1.84 × 1021 
D)  3.61 × 1010

Question 19

In the reaction between Ba(NO3)2 and Na2SO4, the following statement is true:

Accepted Answer

A)  2.0 mole of Ba(NO3)2 and 4.0 moles of Na2SO4 react without excess remaining 
B)  Two moles of Ba(NO3)2 with excess Na2SO4 will form two moles of BaSO4 
C)  These two compounds react to form solid NaNO3, Ba2+, and SO42 −  
D)  Sulfate is a spectator ion 
A)  2.0 mole of Ba(NO3)2 and 4.0 moles of Na2SO4 react without excess remaining 
B)  Two moles of Ba(NO3)2 with excess Na2SO4 will form two moles of BaSO4 
C)  These two compounds react to form solid NaNO3, Ba2+, and SO42 −  
D)  Sulfate is a spectator ion

Question 20

Which of the following equations best illustrate the net ionic equation for the reaction of radium chloride with potassium sulfate?

Accepted Answer

A)  RaCl2 + K2SO4 → RaSO4 + 2 KCl 
B)  Ra2+ (aq) + 2 Cl1 −  (aq) + 2 K1+ (aq) + SO42 −  (aq) → RaSO4 (s) + 2 Cl1 −  (aq) + 2 K1+ (aq) 
C)  Ra2+ (aq) + SO42 −  (aq) → RaSO4 (s) 
D)  Ra2+ (aq) + 2 Cl1 −  (aq) + 2 K1+ (aq) + SO42 −  (aq) → RaSO4 (s) + 2 KCl (aq) 
A)  RaCl2 + K2SO4 → RaSO4 + 2 KCl 
B)  Ra2+ (aq) + 2 Cl1 −  (aq) + 2 K1+ (aq) + SO42 −  (aq) → RaSO4 (s) + 2 Cl1 −  (aq) + 2 K1+ (aq) 
C)  Ra2+ (aq) + SO42 −  (aq) → RaSO4 (s) 
D)  Ra2+ (aq) + 2 Cl1 −  (aq) + 2 K1+ (aq) + SO42 −  (aq) → RaSO4 (s) + 2 KCl (aq)

The greatest challenge facing biomass for energy needs is:

Acids and bases react to give noxious gases and oxides

Barium sulfate is a strong electrolyte

Which of the following illustrates the balanced reaction of ethyl alcohol with an excess of oxygen to form carbon dioxide and water?

Thirty moles of hydrogen and 14 moles of oxygen should react to produce 252 grams of water and 2 grams of hydrogen.

This reaction: C₇H₁₆ + 11 O2 → 7 CO₂ + 8 H₂O represents the complete combustion of heptane.

If 92.8 grams of sodium nitrite is dissolved in sufficient water to prepare 2.3 L of water, the resulting solution has a molarity of:

In the reaction between Fe and CuCl₂, the following statement is true:

The Law of Conservation of Matter can be interpreted correctly to mean that atoms of one element are neither created nor destroyed in a chemical reaction.

How many oxygen atoms are present in 5 molecules of CuSO₄ 5H₂O?

If the solubility of NaCl in water is 35.7g NaCl / 100g H₂O, what is the minimal volume of water needed to dissolve 100 grams of the salt?

Given that: 2 H₂( g ) + O₂( g ) → 2 H₂O( g ), four moles of hydrogen should react with appropriate oxygen to produce 2 moles of water.

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

A "neon" sign contains 2.4 × 10² mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign?

Sodium nitrate is a strong electrolyte.

How many aluminum atoms are present in 4 molecules of AlCl₃?

Potassium permanganate is a soluble salt.

How many atoms are contained in 5.99 × 10^{− 14} moles of glucose (C₆H₁₂O₆)?

In the reaction between Ba(NO₃)₂ and Na₂SO₄, the following statement is true:

Which of the following equations best illustrate the net ionic equation for the reaction of radium chloride with potassium sulfate?

Introduction to Chemistry

Atoms and Molecules

Stoichiometry

Gases

The Periodic Table and Atomic Structure

Chemical Bonding and Molecular Structure

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Electrochemistry

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Exam 3: Molecules Moles Chemical Equations

The greatest challenge facing biomass for energy needs is:

Acids and bases react to give noxious gases and oxides

Barium sulfate is a strong electrolyte

Which of the following illustrates the balanced reaction of ethyl alcohol with an excess of oxygen to form carbon dioxide and water?

Thirty moles of hydrogen and 14 moles of oxygen should react to produce 252 grams of water and 2 grams of hydrogen.

This reaction: C7H16 + 11 O2 → 7 CO2 + 8 H2O represents the complete combustion of heptane.

If 92.8 grams of sodium nitrite is dissolved in sufficient water to prepare 2.3 L of water, the resulting solution has a molarity of:

In the reaction between Fe and CuCl2, the following statement is true:

The Law of Conservation of Matter can be interpreted correctly to mean that atoms of one element are neither created nor destroyed in a chemical reaction.

How many oxygen atoms are present in 5 molecules of CuSO4 5H2O?

If the solubility of NaCl in water is 35.7g NaCl / 100g H2O, what is the minimal volume of water needed to dissolve 100 grams of the salt?

Given that: 2 H2( g ) + O2( g ) → 2 H2O( g ), four moles of hydrogen should react with appropriate oxygen to produce 2 moles of water.

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

A "neon" sign contains 2.4 × 102 mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign?

Sodium nitrate is a strong electrolyte.

How many aluminum atoms are present in 4 molecules of AlCl3?

Potassium permanganate is a soluble salt.

How many atoms are contained in 5.99 × 10 − 14 moles of glucose (C6H12O6)?

In the reaction between Ba(NO3)2 and Na2SO4, the following statement is true:

Which of the following equations best illustrate the net ionic equation for the reaction of radium chloride with potassium sulfate?

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

This reaction: C₇H₁₆ + 11 O2 → 7 CO₂ + 8 H₂O represents the complete combustion of heptane.

In the reaction between Fe and CuCl₂, the following statement is true:

How many oxygen atoms are present in 5 molecules of CuSO₄ 5H₂O?

If the solubility of NaCl in water is 35.7g NaCl / 100g H₂O, what is the minimal volume of water needed to dissolve 100 grams of the salt?

Given that: 2 H₂( g ) + O₂( g ) → 2 H₂O( g ), four moles of hydrogen should react with appropriate oxygen to produce 2 moles of water.

A "neon" sign contains 2.4 × 10² mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign?

How many aluminum atoms are present in 4 molecules of AlCl₃?

How many atoms are contained in 5.99 × 10^{− 14} moles of glucose (C₆H₁₂O₆)?

In the reaction between Ba(NO₃)₂ and Na₂SO₄, the following statement is true: