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College Environmental Science
Carbon dioxide is
  1. the most potent (per molecule of gas) of the greenhouse gases.
  2. the most abundant greenhouse gas.
  3. more potent (per molecule of gas) than methane.
  4. the main anthropogenic greenhouse gas produced in the United States.
  5. the only greenhouse gas presently increasing in the atmosphere.
Grade 9 Bonds and Mixing
Grade 9 Biochemical Pathways
College Biochemical Pathways
A product of photosynthesis is molecular oxygen. What is the source of this oxygen?
  1. water and carbon dioxide
  2. carbon dioxide and glucose
  3. water
  4. carbon dioxide
  5. none of the above
Grade 8 Historical Geology
The Earth's atmosphere during the first billion years of its existence was made up mainly of what two gases?
  1. oxygen, nitrogen
  2. carbon dioxide, ammonia
  3. carbon dioxide, nitrogen
  4. oxygen, sulfur dioxide
Grade 4 Biochemical Pathways
Plants take in                          and give out                         .
  1. carbon dioxide / oxygen
  2. helium / oxygen
  3. carbon dioxide / glucose
  4. oxygen / carbon dioxide
Grade 10 Outer Planets
Grade 9 Biochemical Pathways
What are the products made at the end of alcoholic fermentation?
  1. yeast and carbon dioxide
  2. alcohol and yeast
  3. carbon dioxide, alcohol, and yeast
  4. alcohol and carbon dioxide
Grade 5 Botany
Grade 8 Properties of Matter
Grade 9 Respiration, Digestion, and Excretion
Carbon dioxide diffuses from the
  1. alveoli to the capillaries.
  2. capillaries to the alveoli.
  3. capillaries to the veins.
  4. venules to the bronchi.
Grade 7 Environmental Science
Grade 9 Volcanoes
What kind of gas does Kilauea release?
  1. carbon dioxide
  2. carbon monoxide
  3. oxygen
  4. sulfur dioxide
Grade 11 Molecules and Compounds
What is the formula for nitrogen dioxide?
  1. [math]NO[/math]
  2. [math]N_2O[/math]
  3. [math]NO_2[/math]
  4. [math]N_2O_2[/math]
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