Tag: chemistry

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Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

Which of the following is a greenhouse gas?

  1. Nitrogen

  2. Oxygen

  3. Ozone

  4. Helium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A greenhouse gas is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. 

Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

_________ is a gas in an atmosphere that absorbs and emits radiation within the thermal infra-red range.

  1. Global gas

  2. Greenhouse gas

  3. Green gas

  4. Noble gas
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. 

Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

Black carbon, a potential global warming gas causes__________.

  1. human morbidity

  2. premature mortality

  3. both a and b

  4. asthma
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Black carbon consists of pure carbon in several linked forms. It is formed through the incomplete combustion of fossil fuels, biofuel, and biomass, and is emitted in both anthropogenic and naturally occurring soot. Black carbon causes human morbidity and premature mortality.

Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

The greenhouse effect is useful because:

  1. it reduces water pollution

  2. it increases normal temperature of earth

  3. keeps the temperatures on our planet mild and suitable for living things

  4. reduces greenhouse gases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The greenhouse effect is useful because trapping some energy keeps the temperatures on our planet mild and suitable for living things. Without its atmosphere and the greenhouse effect, the average temperature at the surface of the Earth would have been very low.

Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

Greenhouse gases cause:

  1. ocean acidification

  2. ozone depletion

  3. smog pollution

  4. all of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Increases in the different greenhouse gases have other effects apart from global warming, including ocean acidification (by acid rain), smog pollution (contaminated particles in air) and ozone depletion as well as changes to plant growth and nutrition levels.

Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

__________ used as refrigerants and aerosol propellants are also greenhouse gases.

  1. Perfluorocarbons

  2. Sulfur hexafluoride

  3. Chlorofluorocarbons (CFCs)

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorofluorocarbons (CFCs), once used as refrigerants and aerosol propellants until they were phased out by international agreement, are also greenhouse gases. They damage the ozone layer of the atmosphere. 

Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

Full synthetic oils are derived from crude oil or byproducts through a chemical process rather than the __________ process used for conventional oil.

  1. distilliation

  2. fractional distillation

  3. vacum distillation

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Synthetic oil is a lubricant consisting of chemical compounds that are artificially made. Synthetic lubricants can be manufactured using chemically modified petroleum components rather than whole crude oil, but can also be synthesized from other raw materials. Full synthetic oils are derived from crude oil or byproducts through a chemical process rather than the distillation process used for conventional oil. The resulting synthetic oil has a more consistent molecular size and therefore tends to have somewhat more uniform properties.