Question 1

Which process plays the most important role in the greenhouse effect?

Accepted Answer

A) Energy from the sun is reflected back into the atmosphere. 
B) Energy from the sun is absorbed by the earth. 
C) Energy from the sun is absorbed by the atmosphere. 
D) Energy radiated by the earth is absorbed by the atmosphere.

Question 2

Tropospheric ozone (O3)is a greenhouse gas.Why is O3 not assigned a Global Warming Potential (GWP)?

Accepted Answer

A) Ozone molecules absorb only low energy infrared frequencies. 
B) Ozone molecules have a low molecular weight. 
C) Tropospheric ozone concentrations are not changed by human activity. 
D) Ozone has a relatively short lifetime in the troposphere and its distribution is not uniform around the worlD.

Question 3

Hydrogen gas (H2)is a promising alternative to fossil fuels.How many molecules are present in 1.0 kg of hydrogen gas?

Accepted Answer

A) 3.0 × 1023 
B) 6.0 × 1023 
C) 3.0 × 1026 
D) 6.0 × 1026

Question 4

In their fourth and most recent report published in 2007,the vast majority of scientists agreed on several key points.Which of the following is NOT one of those points?

Accepted Answer

A) If the rate of greenhouse gas emissions is not curtailed,our water resources,food supply,and even our health will suffer. 
B) Human activities (primarily the combustion of fossil fuels and deforestation)are responsible for much of the recent warming. 
C) The Earth is getting warmer. 
D) All of the above were mentioned as key points.

Question 5

How many atoms are present in 0.375 mol of palladium (Pd)atoms?

Accepted Answer

A) 1.61 × 1024 
B) 6.02 × 1023 
C) 2.26 × 1023 
D) 2.12 × 1021

Question 6

Although coal is a complex mixture of substances,its elemental composition can be approximated by the formula C135H96O9NS.Using this formula,predict the amount of CO2 released from the combustion of 1.00 × 106 metric tons of coal (about the annual average for a coal-fired power plant).1 metric ton = 1 × 103 kg

Accepted Answer

A) 3.66 × 109 kg 
B) 3.11 × 109 kg 
C) 8.50 × 108 kg 
D) 3.11 × 105 kg

Question 7

What is the yearly change in the carbon dioxide concentration in the Earth's atmosphere?

Accepted Answer

A) +1.5 ppm 
B) +6.5 ppm 
C) -1.5 ppm 
D) 0 ppm

Question 8

In order to make useful predictions,which factors must be accounted for by climatic models?
I.Aerosol Emissions
II.Land Use
III.Solar Irradiance

Accepted Answer

A) II only 
B) II and III only 
C) I and III only 
D) I,II,and III only

Question 9

Ethanol (C2H6O)is a common intoxicant and fuel produced from the fermentation of various grains.How many moles of ethanol are represented by 50.0 kg of ethanol?

Accepted Answer

A) 1.09 × 103 mol 
B) 46.1 mol 
C) 9.00 mol 
D) 1.09 mol

Question 10

The Intergovernmental Panel on Climate Change (IPCC)issued a report in 2007 that attached probabilities to the predictions and statements made.Which prediction/statement was considered "Very Unlikely"?

Accepted Answer

A) Human-caused emissions are the main factor causing warming since 1950. 
B) Arctic sea ice thickness declined about 40% during late summer to early autumn in recent decades 
C) The observed warming over the past 100 years is due solely to climatic variability. 
D) In most of the areas in the Northern Hemisphere,precipitation has increased

Question 11

Which occurrences or processes are expected to reduce the level of atmospheric carbon?
I.Decaying plant and animal remains
II.The growth of trees
III.Formation of carbonate rock in the ocean
IV.Animal respiration

Accepted Answer

A) I and II only 
B) II and III only 
C) III and IV only 
D) I and IV only

Question 12

Octane (C8H18)is one of the principal components of gasoline.How many moles of CO2 are produced during the combustion of 3.0 mol of octane?
Unbalanced equation: C8H18 + O2 → CO2 + H2O

Accepted Answer

A) 3.0 
B) 8.0 
C) 24 
D) 26

Question 13

Find the molar mass of ethanol,C2H6O.

Accepted Answer

A) 29.02 g/mol 
B) 45.06 g/mol 
C) 46.07 g/mol 
D) 110.0 g/mol

Question 14

Forcings are

Accepted Answer

A) geological changes that promote volcanic eruptions. 
B) mechanisms for sequestering CO2 endorsed by signers of the Kyoto Protocol. 
C) factors that affect the annual global mean surface temperature. 
D) changes in geographical distribution of plant,animal,and insect species brought on by climate change.

Question 15

What is the coefficient for oxygen in the balanced chemical equation for the combustion of heptane (C7H16)? Unbalanced equation: C7H16 + O2 → CO2 + H2O

Accepted Answer

A) 11 
B) 8 
C) 7 
D) 1

Question 16

Which atmospheric component does not contribute to global warming?

Accepted Answer

A) H2O 
B) CO2 
C) N2 
D) O3

Question 17

Which of the following are ways that aerosols may affect climate?

Accepted Answer

A) Scattering incoming radiation 
B) Nucleation of clouds 
C) Absorbing incoming radiation 
D) All of the above

Question 18

Predict the geometry of nitrous oxide,N2O (atomic order NO).

Accepted Answer

A) linear 
B) bent 
C) trigonal pyramidal 
D) trigonal planar

Question 19

Which of the following is NOT a likely consequence of increased carbon dioxide concentration in the atmosphere?

Accepted Answer

A) Sea ice disappearance 
B) Sea-level rise 
C) Changes in ocean chemistry 
D) Increase in biodiversity

Question 20

The greenhouse effect refers to the process by which

Accepted Answer

A) atmospheric oxygen and nitrogen absorb heat radiated by Earth. 
B) atmospheric nitrogen absorbs ultraviolet radiation radiated by Earth 
C) atmospheric gases trap and return infrared radiation radiated by Earth. 
D) greenhouse gases absorb ultraviolet radiation from the Sun,warming the molecules.

Exam 3: The Chemistry of Global Climate Change

Which process plays the most important role in the greenhouse effect?

Tropospheric ozone (O₃) is a greenhouse gas.Why is O₃ not assigned a Global Warming Potential (GWP) ?

Hydrogen gas (H₂) is a promising alternative to fossil fuels.How many molecules are present in 1.0 kg of hydrogen gas?

In their fourth and most recent report published in 2007,the vast majority of scientists agreed on several key points.Which of the following is NOT one of those points?

How many atoms are present in 0.375 mol of palladium (Pd) atoms?

What is the yearly change in the carbon dioxide concentration in the Earth's atmosphere?

In order to make useful predictions,which factors must be accounted for by climatic models? I.Aerosol Emissions II.Land Use III.Solar Irradiance

Ethanol (C₂H₆O) is a common intoxicant and fuel produced from the fermentation of various grains.How many moles of ethanol are represented by 50.0 kg of ethanol?

The Intergovernmental Panel on Climate Change (IPCC) issued a report in 2007 that attached probabilities to the predictions and statements made.Which prediction/statement was considered "Very Unlikely"?

Which occurrences or processes are expected to reduce the level of atmospheric carbon? I.Decaying plant and animal remains II.The growth of trees III.Formation of carbonate rock in the ocean IV.Animal respiration

Octane (C₈H₁₈) is one of the principal components of gasoline.How many moles of CO₂ are produced during the combustion of 3.0 mol of octane? Unbalanced equation: C₈H₁₈ + O₂ → CO₂ + H₂O

Find the molar mass of ethanol,C₂H₆O.

Forcings are

What is the coefficient for oxygen in the balanced chemical equation for the combustion of heptane (C₇H₁₆) ? Unbalanced equation: C₇H₁₆ + O₂ → CO₂ + H₂O

Which atmospheric component does not contribute to global warming?

Which of the following are ways that aerosols may affect climate?

Predict the geometry of nitrous oxide,N₂O (atomic order NO) .

Which of the following is NOT a likely consequence of increased carbon dioxide concentration in the atmosphere?

The greenhouse effect refers to the process by which

Exam 3: The Chemistry of Global Climate Change

Which process plays the most important role in the greenhouse effect?

Tropospheric ozone (O3) is a greenhouse gas.Why is O3 not assigned a Global Warming Potential (GWP) ?

Hydrogen gas (H2) is a promising alternative to fossil fuels.How many molecules are present in 1.0 kg of hydrogen gas?

In their fourth and most recent report published in 2007,the vast majority of scientists agreed on several key points.Which of the following is NOT one of those points?

How many atoms are present in 0.375 mol of palladium (Pd) atoms?

What is the yearly change in the carbon dioxide concentration in the Earth's atmosphere?

In order to make useful predictions,which factors must be accounted for by climatic models? I.Aerosol Emissions II.Land Use III.Solar Irradiance

Ethanol (C2H6O) is a common intoxicant and fuel produced from the fermentation of various grains.How many moles of ethanol are represented by 50.0 kg of ethanol?

The Intergovernmental Panel on Climate Change (IPCC) issued a report in 2007 that attached probabilities to the predictions and statements made.Which prediction/statement was considered "Very Unlikely"?

Which occurrences or processes are expected to reduce the level of atmospheric carbon? I.Decaying plant and animal remains II.The growth of trees III.Formation of carbonate rock in the ocean IV.Animal respiration

Octane (C8H18) is one of the principal components of gasoline.How many moles of CO2 are produced during the combustion of 3.0 mol of octane? Unbalanced equation: C8H18 + O2 → CO2 + H2O

Find the molar mass of ethanol,C2H6O.

Forcings are

What is the coefficient for oxygen in the balanced chemical equation for the combustion of heptane (C7H16) ? Unbalanced equation: C7H16 + O2 → CO2 + H2O

Which atmospheric component does not contribute to global warming?

Which of the following are ways that aerosols may affect climate?

Predict the geometry of nitrous oxide,N2O (atomic order NO) .

Which of the following is NOT a likely consequence of increased carbon dioxide concentration in the atmosphere?

The greenhouse effect refers to the process by which

Tropospheric ozone (O₃) is a greenhouse gas.Why is O₃ not assigned a Global Warming Potential (GWP) ?

Hydrogen gas (H₂) is a promising alternative to fossil fuels.How many molecules are present in 1.0 kg of hydrogen gas?

Ethanol (C₂H₆O) is a common intoxicant and fuel produced from the fermentation of various grains.How many moles of ethanol are represented by 50.0 kg of ethanol?

Octane (C₈H₁₈) is one of the principal components of gasoline.How many moles of CO₂ are produced during the combustion of 3.0 mol of octane? Unbalanced equation: C₈H₁₈ + O₂ → CO₂ + H₂O

Find the molar mass of ethanol,C₂H₆O.

What is the coefficient for oxygen in the balanced chemical equation for the combustion of heptane (C₇H₁₆) ? Unbalanced equation: C₇H₁₆ + O₂ → CO₂ + H₂O

Predict the geometry of nitrous oxide,N₂O (atomic order NO) .