Question 1

How many moles of caffeine are in 1.250 kg sample, C8H10N4O2?

Accepted Answer

A) 6.4 × 10 − 6 moles 
B) 0.006 moles 
C) 0.008 moles 
D) 6.44 moles 
E) 8.56 moles 
A) 6.4 × 10 − 6 moles 
B) 0.006 moles 
C) 0.008 moles 
D) 6.44 moles 
E) 8.56 moles

Question 2

An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many flamingos can a zoo obtain in exchange for 6 rhinos?

Accepted Answer

A) 10 flamingos 
B) 30 flamingos 
C) 50 flamingos 
D) 120 flamingos 
E) 160 flamingos 
A) 10 flamingos 
B) 30 flamingos 
C) 50 flamingos 
D) 120 flamingos 
E) 160 flamingos

Question 3

Calculate the mass in grams of a 1.070 moles of acetylene, C2H2.

Accepted Answer

A) 0.02434 grams 
B) 0.04415 grams 
C) 14.98 grams 
D) 25.68 grams 
E) 27.82 grams 
A) 0.02434 grams 
B) 0.04415 grams 
C) 14.98 grams 
D) 25.68 grams 
E) 27.82 grams

Question 4

Using the old English measurements of volume listed, determine the number of noggins in one butt.

Accepted Answer

A) 104.92 noggins 
B) 128.00 noggins 
C) 209.83 noggins 
D) 1678.7 noggins 
E) 3357.3 noggins 
A) 104.92 noggins 
B) 128.00 noggins 
C) 209.83 noggins 
D) 1678.7 noggins 
E) 3357.3 noggins

Question 5

What is the coefficient in front of sodium nitride when the equation is balanced?
__ Na3N → __ Na(s)+ __ N2(g)

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4 
A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 6

For the reaction:    4NH3 + 5O2 ® 6H2O + 4NO
If 125.0 g of NH3 is reacted with 225.0 g of O , how many grams of NO will be present after a complete reaction?
​

Accepted Answer

A) 0 grams 
B) 168.8 grams 
C) 220.6 grams 
D) 350.0 grams 
A) 0 grams 
B) 168.8 grams 
C) 220.6 grams 
D) 350.0 grams

Question 7

How many moles of carbon atoms are in 5 moles of ethanol, CH3CH2OH?

Accepted Answer

A) 2.5 mole 
B) 5 moles 
C) 10 moles 
D) 30 moles 
E) 120 moles 
A) 2.5 mole 
B) 5 moles 
C) 10 moles 
D) 30 moles 
E) 120 moles

Question 8

For the reaction:    4NH3 + 5O2 ® 6H2O + 4NO
If 125.0 g of NH3 is reacted with 225.0 g of O2, what is the limiting reagent?
​

Accepted Answer

A) NH3 
B) O2 
C) H2O 
D) NO 
E) None of the above. 
A) NH3 
B) O2 
C) H2O 
D) NO 
E) None of the above.

Question 9

Methane can be decomposed into two simpler substances, hydrogen and carbon. Therefore, methane

Accepted Answer

A) is a gas. 
B) is an element. 
C) is a mixture. 
D) is a compound. 
E) must have the formula CH. 
A) is a gas. 
B) is an element. 
C) is a mixture. 
D) is a compound. 
E) must have the formula CH.

Question 10

For an ionic compound, X2Y5, if the charge on each Y ion is − 2, the charge on each X ion is:

Accepted Answer

A) − 2 
B) − 5 
C) − 10 
D) +10 
E) +5 
A) − 2 
B) − 5 
C) − 10 
D) +10 
E) +5

Question 11

An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many anteaters can a zoo obtain in exchange for 4 oryxes?

Accepted Answer

A) 6 anteaters 
B) 10 anteaters 
C) 15 anteaters 
D) 20 anteaters 
E) 30 anteaters 
A) 6 anteaters 
B) 10 anteaters 
C) 15 anteaters 
D) 20 anteaters 
E) 30 anteaters

Question 12

How many grams of nitrogen dioxide are required to produce 260 grams of nitrogen monoxide?
3NO2 + H2O → 2HNO3 + NO

Accepted Answer

A) 8.67 grams 
B) 56.52 grams 
C) 132 grams 
D) 399 grams 
E) 1196 grams 
A) 8.67 grams 
B) 56.52 grams 
C) 132 grams 
D) 399 grams 
E) 1196 grams

Question 13

For the reaction:    4NH3 + 5O2 ® 6H2O + 4NO
If 125.0 g of NH3 is reacted with 225.0 g of O2, how many grams of O2 will be present after a complete reaction?
​

Accepted Answer

A) 0 grams 
B) 125.0 grams 
C) 225.0 grams 
D) 350.0 grams 
A) 0 grams 
B) 125.0 grams 
C) 225.0 grams 
D) 350.0 grams

Question 14

What is the molecular weight of boric acid, B(OH)3?

Accepted Answer

A) 51 amu 
B) 61.83 amu 
C) 101.3 amu 
D) 153 amu 
E) 306 amu 
A) 51 amu 
B) 61.83 amu 
C) 101.3 amu 
D) 153 amu 
E) 306 amu

Question 15

Which of these substances is not a mixture of different compounds?

Accepted Answer

A) Air 
B) Salt water 
C) Gasoline 
D) Table salt 
E) Lemonade 
A) Air 
B) Salt water 
C) Gasoline 
D) Table salt 
E) Lemonade

Question 16

How many moles of carbon atoms are in 1.574 g of novocain, C13H21N2O2Cl?

Accepted Answer

A) 0.01008 moles 
B) 0.005776 moles 
C) 0.07510 moles 
D) 0.12096 moles 
E) 0.006148 moles 
A) 0.01008 moles 
B) 0.005776 moles 
C) 0.07510 moles 
D) 0.12096 moles 
E) 0.006148 moles

Question 17

Using the old English measurements of volume listed, determine the number of hogsheads in five kilderkins.

Accepted Answer

A) 1.72 hogsheads 
B) 2.91 hogsheads 
C) 90 hogsheads 
D) 4,721 hogsheads 
E) 42,489 hogsheads 
A) 1.72 hogsheads 
B) 2.91 hogsheads 
C) 90 hogsheads 
D) 4,721 hogsheads 
E) 42,489 hogsheads

Question 18

Which of these is the correct ratio of sulfur to oxygen in SO2?

Accepted Answer

A) 1 sulfur: 2 oxygen 
B) 2 sulfur: 1 oxygen 
C) 2 sulfur: 2 oxygen 
D) 2 sulfur: 3 oxygen 
E) 1 sulfur: 3 oxygen 
A) 1 sulfur: 2 oxygen 
B) 2 sulfur: 1 oxygen 
C) 2 sulfur: 2 oxygen 
D) 2 sulfur: 3 oxygen 
E) 1 sulfur: 3 oxygen

Question 19

Which of these is the correct name for Rb3N?

Accepted Answer

A) Rubidium nitride 
B) Radon nitride 
C) Trirubdium nitride 
D) Triradon nitride 
E) Rubidium trinitride 
A) Rubidium nitride 
B) Radon nitride 
C) Trirubdium nitride 
D) Triradon nitride 
E) Rubidium trinitride

Question 20

For the reaction:    4NH3 + 5O2 ® 6H2O + 4NO
If 125.0 g of NH3 is reacted with 225.0 g of O2, how many grams of NH3 will be present after a complete reaction?

Accepted Answer

A) 0 grams 
B) 29.4 grams 
C) 95.6 grams 
D) 125.0 grams 
A) 0 grams 
B) 29.4 grams 
C) 95.6 grams 
D) 125.0 grams

How many moles of caffeine are in 1.250 kg sample, C₈H₁₀N₄O₂?

An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many flamingos can a zoo obtain in exchange for 6 rhinos?

Calculate the mass in grams of a 1.070 moles of acetylene, C₂H₂.

Using the old English measurements of volume listed, determine the number of noggins in one butt.

What is the coefficient in front of sodium nitride when the equation is balanced? Na₃N → Na(s)+ __ N₂(g)

For the reaction: 4NH₃ + 5O₂ ® 6H₂O + 4NO If 125.0 g of NH₃ is reacted with 225.0 g of O , how many grams of NO will be present after a complete reaction?

How many moles of carbon atoms are in 5 moles of ethanol, CH₃CH₂OH?

For the reaction: 4NH₃ + 5O₂ ® 6H₂O + 4NO If 125.0 g of NH₃ is reacted with 225.0 g of O₂, what is the limiting reagent?

Methane can be decomposed into two simpler substances, hydrogen and carbon. Therefore, methane

For an ionic compound, X₂Y₅, if the charge on each Y ion is − 2, the charge on each X ion is:

An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many anteaters can a zoo obtain in exchange for 4 oryxes?

How many grams of nitrogen dioxide are required to produce 260 grams of nitrogen monoxide? 3NO₂ + H₂O → 2HNO₃ + NO

For the reaction: 4NH₃ + 5O₂ ® 6H₂O + 4NO If 125.0 g of NH₃ is reacted with 225.0 g of O₂, how many grams of O₂ will be present after a complete reaction?

What is the molecular weight of boric acid, B(OH)₃?

Which of these substances is not a mixture of different compounds?

How many moles of carbon atoms are in 1.574 g of novocain, C₁₃H₂₁N₂O₂Cl?

Using the old English measurements of volume listed, determine the number of hogsheads in five kilderkins.

Which of these is the correct ratio of sulfur to oxygen in SO₂?

Which of these is the correct name for Rb₃N?

For the reaction: 4NH₃ + 5O₂ ® 6H₂O + 4NO If 125.0 g of NH₃ is reacted with 225.0 g of O₂, how many grams of NH₃ will be present after a complete reaction?

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The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

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Exam 4: Molecules, Compounds, and Chemical Reactions

How many moles of caffeine are in 1.250 kg sample, C8H10N4O2?

An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many flamingos can a zoo obtain in exchange for 6 rhinos?

Calculate the mass in grams of a 1.070 moles of acetylene, C2H2.

Using the old English measurements of volume listed, determine the number of noggins in one butt.

What is the coefficient in front of sodium nitride when the equation is balanced? __ Na3N → __ Na(s)+ __ N2(g)

For the reaction: 4NH3 + 5O2 ® 6H2O + 4NO If 125.0 g of NH3 is reacted with 225.0 g of O , how many grams of NO will be present after a complete reaction? ​

How many moles of carbon atoms are in 5 moles of ethanol, CH3CH2OH?

For the reaction: 4NH3 + 5O2 ® 6H2O + 4NO If 125.0 g of NH3 is reacted with 225.0 g of O2, what is the limiting reagent? ​

Methane can be decomposed into two simpler substances, hydrogen and carbon. Therefore, methane

For an ionic compound, X2Y5, if the charge on each Y ion is − 2, the charge on each X ion is:

An international group of zookeepers with successful breeding programs made the following animal exchanges last year. Using the same bartering system, how many anteaters can a zoo obtain in exchange for 4 oryxes?

How many grams of nitrogen dioxide are required to produce 260 grams of nitrogen monoxide? 3NO2 + H2O → 2HNO3 + NO

For the reaction: 4NH3 + 5O2 ® 6H2O + 4NO If 125.0 g of NH3 is reacted with 225.0 g of O2, how many grams of O2 will be present after a complete reaction? ​

What is the molecular weight of boric acid, B(OH)3?

Which of these substances is not a mixture of different compounds?

How many moles of carbon atoms are in 1.574 g of novocain, C13H21N2O2Cl?

Using the old English measurements of volume listed, determine the number of hogsheads in five kilderkins.

Which of these is the correct ratio of sulfur to oxygen in SO2?

Which of these is the correct name for Rb3N?

For the reaction: 4NH3 + 5O2 ® 6H2O + 4NO If 125.0 g of NH3 is reacted with 225.0 g of O2, how many grams of NH3 will be present after a complete reaction?

Molecular Reasons

The Chemists Toolbox

Atoms and Elements

Chemical Bonding

Organic Chemistry

Light and Color

Nuclear Chemistry

Energy for Today

Energy for Tomorrow: Solar and Other Renewable Energy Sources

The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

Oxidation and Reduction

The Chemistry of Household Products

Biochemistry and Biotechnology

Drugs and Medicine: Healing, Helping, and Hurting

The Chemistry of Food

Nanotechnology

Filters

How many moles of caffeine are in 1.250 kg sample, C₈H₁₀N₄O₂?

Calculate the mass in grams of a 1.070 moles of acetylene, C₂H₂.

What is the coefficient in front of sodium nitride when the equation is balanced? Na₃N → Na(s)+ __ N₂(g)

For the reaction: 4NH₃ + 5O₂ ® 6H₂O + 4NO If 125.0 g of NH₃ is reacted with 225.0 g of O , how many grams of NO will be present after a complete reaction?

How many moles of carbon atoms are in 5 moles of ethanol, CH₃CH₂OH?

For the reaction: 4NH₃ + 5O₂ ® 6H₂O + 4NO If 125.0 g of NH₃ is reacted with 225.0 g of O₂, what is the limiting reagent?

For an ionic compound, X₂Y₅, if the charge on each Y ion is − 2, the charge on each X ion is:

How many grams of nitrogen dioxide are required to produce 260 grams of nitrogen monoxide? 3NO₂ + H₂O → 2HNO₃ + NO

For the reaction: 4NH₃ + 5O₂ ® 6H₂O + 4NO If 125.0 g of NH₃ is reacted with 225.0 g of O₂, how many grams of O₂ will be present after a complete reaction?

What is the molecular weight of boric acid, B(OH)₃?

How many moles of carbon atoms are in 1.574 g of novocain, C₁₃H₂₁N₂O₂Cl?

Which of these is the correct ratio of sulfur to oxygen in SO₂?

Which of these is the correct name for Rb₃N?

For the reaction: 4NH₃ + 5O₂ ® 6H₂O + 4NO If 125.0 g of NH₃ is reacted with 225.0 g of O₂, how many grams of NH₃ will be present after a complete reaction?