Question 1

Methane is produced in fairly large quantities by which animal?

Accepted Answer

A)  dogs
B)  cows
C)  pigs
D)  chickensE) A) and D)
F) None of the above

Question 2

The law of conservation of mass dictates that there must be the same number of reactant molecules as product molecules.

Accepted Answer

A) True 
 B)False

Question 3

If a sample of NaCl contains 6.0 moles of NaCl, then the sample contains ____ NaCl molecules.

Accepted Answer

The answer of If a sample of NaCl contains 6.0...

Question 4

Chlorofluorocarbons are present

Accepted Answer

A)  as a natural component of the atmosphere.
B)  in aerosol sprays, freezers and refrigerators.
C)  as a by-product of the formation of acids in the atmosphere.
D)  in sewage effluent that ends up in our rivers and the ocean.E) A) and D)
F) B) and D)

Question 5

The chemical equation shown here is balanced except for the value of x.The value of x is _____.
Ca(ClO3)2 F1F1F1S1F1F1F10 CaCl2 + xO2

Accepted Answer

Question 6

How many atoms are there in one molecule of the fatty acid, arachidonic acid, C20H32O2?

Accepted Answer

A)  32
B)  20
C)  162
D)  54E) A) and B)
F) A) and D)

Question 7

The mass of one third of a mole of carbon is _____.

Accepted Answer

The answer of The mass of one third of a...

Question 8

The formula for methane is CH4.3.0 × 1026 molecules of methane would weigh _____ in grams.

Accepted Answer

Question 9

The ozone hole

Accepted Answer

A)  can lead to increases in skin cancer rates.
B)  has the potential to damage to crops.
C)  has formed both in the Arctic and Antarctic.
D)  All of the above.E) A) and C)
F) B) and D)

Question 10

Which one of these is not a significant greenhouse gas?

Accepted Answer

A)  carbon dioxide
B)  nitrous oxide
C)  methane
D)  fluorinated gases
E)  argonF) A) and E)
G) A) and B)

Question 11

Instead of allowing methane to escape into the atmosphere, where it can contribute to global warming, some farmers are

Accepted Answer

A)  trapping it in underground ponds.
B)  collecting it and using it to power their farms.
C)  using it as a source of fertilizer on their larger sized fields.
D)  combining it with zinc and other nutrients to create feed for animals.E) A) and C)
F) None of the above

Question 12

The state must always be written in a chemical equation in order for the equation to be considered complete.

Accepted Answer

A) True 
 B)False  False

Question 13

The molar mass for ozone, O3, is _____; therefore, _____ grams would be contained in 85.0 moles of ozone.

Accepted Answer

Question 14

The phases on each side of a chemical equation must be the same in order to obey the law of conservation of mass.

Accepted Answer

A) True 
 B)False

Question 15

If your car burns 8.0 kg of octane, C8H18, per month, then it burns _____ moles of octane.

Accepted Answer

70

Question 16

Consider the following balanced chemical equation:
PCl3 + 3H2O F1F1F1S1F1F1F10 H3PO3 + 3HCl
If 4.4 moles of PCl3 react, _____ grams of HCl are formed.

Accepted Answer

Question 17

The mass of one mole of phosphorus is _____.

Accepted Answer

The answer of The mass of one mole of phosphorus...

Question 18

The mass of one mole of calcium is _____.

Accepted Answer

40.08 g

Exam 7: Chemical Reactions How We Keep Track of Chemical Changes

Methane is produced in fairly large quantities by which animal?

Correct Answer
verified

The law of conservation of mass dictates that there must be the same number of reactant molecules as product molecules.

Correct Answer
verified

If a sample of NaCl contains 6.0 moles of NaCl, then the sample contains ____ NaCl molecules.

Correct Answer
verified

Chlorofluorocarbons are present

Correct Answer
verified

The chemical equation shown here is balanced except for the value of x.The value of x is _____. Ca(ClO₃)₂  CaCl₂ + xO₂

Correct Answer
verified

How many atoms are there in one molecule of the fatty acid, arachidonic acid, C₂₀H₃₂O₂?

Correct Answer
verified

The mass of one third of a mole of carbon is _____.

Correct Answer
verified

The formula for methane is CH₄.3.0 × 10²⁶ molecules of methane would weigh _____ in grams.

Correct Answer
verified

The ozone hole

Correct Answer
verified

Which one of these is not a significant greenhouse gas?

Correct Answer
verified

Instead of allowing methane to escape into the atmosphere, where it can contribute to global warming, some farmers are

Correct Answer
verified

The state must always be written in a chemical equation in order for the equation to be considered complete.

Correct Answer
verified
False

The molar mass for ozone, O₃, is _; therefore, _ grams would be contained in 85.0 moles of ozone.

Correct Answer
verified

The phases on each side of a chemical equation must be the same in order to obey the law of conservation of mass.

Correct Answer
verified

If your car burns 8.0 kg of octane, C₈H₁₈, per month, then it burns _____ moles of octane.

Correct Answer
verified
70

Consider the following balanced chemical equation: PCl₃ + 3H₂O  H₃PO₃ + 3HCl If 4.4 moles of PCl₃ react, _____ grams of HCl are formed.

Correct Answer
verified

The mass of one mole of phosphorus is _____.

Correct Answer
verified

The mass of one mole of calcium is _____.

Correct Answer
verified
40.08 g

Exam 7: Chemical Reactions How We Keep Track of Chemical Changes

Methane is produced in fairly large quantities by which animal?

Correct AnswerverifiedShow Answer

The law of conservation of mass dictates that there must be the same number of reactant molecules as product molecules.

Correct AnswerverifiedShow Answer

If a sample of NaCl contains 6.0 moles of NaCl, then the sample contains ____ NaCl molecules.

Correct AnswerverifiedShow Answer

Chlorofluorocarbons are present

Correct AnswerverifiedShow Answer

The chemical equation shown here is balanced except for the value of x.The value of x is _____. Ca(ClO3)2  CaCl2 + xO2

Correct AnswerverifiedShow Answer

How many atoms are there in one molecule of the fatty acid, arachidonic acid, C20H32O2?

Correct AnswerverifiedShow Answer

The mass of one third of a mole of carbon is _____.

Correct AnswerverifiedShow Answer

The formula for methane is CH4.3.0 × 1026 molecules of methane would weigh _____ in grams.

Correct AnswerverifiedShow Answer

The ozone hole

Correct AnswerverifiedShow Answer

Which one of these is not a significant greenhouse gas?

Correct AnswerverifiedShow Answer

Instead of allowing methane to escape into the atmosphere, where it can contribute to global warming, some farmers are

Correct AnswerverifiedShow Answer

The state must always be written in a chemical equation in order for the equation to be considered complete.

Correct AnswerverifiedFalse

The molar mass for ozone, O3, is _____; therefore, _____ grams would be contained in 85.0 moles of ozone.

Correct AnswerverifiedShow Answer

The phases on each side of a chemical equation must be the same in order to obey the law of conservation of mass.

Correct AnswerverifiedShow Answer

If your car burns 8.0 kg of octane, C8H18, per month, then it burns _____ moles of octane.

Correct Answerverified70

Consider the following balanced chemical equation: PCl3 + 3H2O  H3PO3 + 3HCl If 4.4 moles of PCl3 react, _____ grams of HCl are formed.

Correct AnswerverifiedShow Answer

The mass of one mole of phosphorus is _____.

Correct AnswerverifiedShow Answer

The mass of one mole of calcium is _____.

Correct Answerverified40.08 g

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The chemical equation shown here is balanced except for the value of x.The value of x is _____. Ca(ClO₃)₂  CaCl₂ + xO₂

Correct Answer
verified

How many atoms are there in one molecule of the fatty acid, arachidonic acid, C₂₀H₃₂O₂?

Correct Answer
verified

Correct Answer
verified

The formula for methane is CH₄.3.0 × 10²⁶ molecules of methane would weigh _____ in grams.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
False

The molar mass for ozone, O₃, is _; therefore, _ grams would be contained in 85.0 moles of ozone.

Correct Answer
verified

Correct Answer
verified

If your car burns 8.0 kg of octane, C₈H₁₈, per month, then it burns _____ moles of octane.

Correct Answer
verified
70

Consider the following balanced chemical equation: PCl₃ + 3H₂O  H₃PO₃ + 3HCl If 4.4 moles of PCl₃ react, _____ grams of HCl are formed.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
40.08 g