Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
26 Cards in this Set
- Front
- Back
|
The amount of carbon dioxide in the atmosphere is maintained through a balance between processes such as: |
photosynthesis, respiration and combustion. |
|
|
Photosynthesis by plants is thought to be a key process in the evolution of the Earth’s atmosphere. True or false? |
True |
|
|
What percentage of the air is nitrogen? |
78% |
|
|
What percentage of the air is oxygen? |
21% |
|
|
What percentage of the air is argon? |
0.9% |
|
|
What percentage of the air is carbon dioxide? |
0.035% |
|
|
Scientists believe the Earth was formed how many years ago? |
4.5 billion |
|
|
It is thought that this early atmosphere consisted of: |
mostly carbon dioxide and water vapour, with a smaller proportion of ammonia, NH3. |
|
|
What is photosynthesis? |
the process that plants use to produce their food. |
|
|
What do plants do for photosynthesis? |
absorb carbon dioxide from the atmosphere and release oxygen as a by-product. |
|
|
Photosynthesis increased the proportion of oxygen in the atmosphere until it reached today’s level. True or false? |
True |
|
|
Living organisms, including all plants and animals, release energy from their food using: |
Respiration |
|
|
Respiration and combustion both release (what) into the atmosphere? |
Carbon dioxide |
|
|
The use of fossil fuels, for example in vehicle engines and power stations, causes: |
Air pollution |
|
|
How does carbon monoxide form asmopheric pollutants? |
By incomplete combustion of the fuel in car engines |
|
|
How does oxides of nitrogen form asmopheric pollutants? |
the heat and pressures found in a car engine |
|
|
How does sulfur dioxide form asmopheric pollutants? |
sulfur impurities in the fuel burn |
|
|
Oxides of nitrogen (NOx) react with other pollutants in sunlight to form a: |
photochemical smog |
|
|
What does a photochemical smog cause? |
Breathing difficulties |
|
|
What do NOx and sulphur dioxide form? |
Acid rain |
|
|
What effects on the environment does acid rain have? |
* killing plants and aquatic life |
|
|
Where can catalytic converters be found? |
In car exhaust systems |
|
|
Car exhaust systems have catalytic converters. These convert carbon monoxide into: |
Carbon dioxide |
|
|
What is the word equation for the conversion of carbon monoxide into carbon dioxide? |
carbon monoxide + nitrogen oxide → nitrogen + carbon dioxide |
|
|
What is the symbol equation for the conversion of carbon monoxide into carbon dioxide? |
2CO + 2NO → N2 + 2CO2 |
|
|
Nitrogen oxide is converted into harmless nitrogen in the converion of carbon monoxide into carbon dioxide. True or false? |
True |
