gases in the atmosphere

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13 Terms

1
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what are the four main gases in the atmosphere

nitrogen - 78%

oxygen- 21%

argon 1%

carbon dioxide 0.04%

2
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what are the two methods that measure the proportion of oxygen

iron wool method

bringing phosphorous

3
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how would you set up the iron wool method

place iron wool in a test tube

invert the test tube in the beaker that has water

leave for several days

what happens is that the iron reacts with the oxygen in the tube, and the water rises to replace the oxygen that has been removed by the iron wool reacting with the oxygen.

Measure the change I the water level

<p>place iron wool in a test tube </p><p>invert the test tube in the beaker that has water </p><p>leave for several days </p><p>what happens is that the iron reacts with the oxygen in the tube, and the water rises to replace the oxygen that has been removed by the iron wool reacting with the oxygen. </p><p></p><p>Measure the change I the water level </p>
4
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what is the formula to finding the percentage of oxygen

start volume- final volume / start volume x 100

5
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how would you set up for the burning phosphorous method

place phosphorous in a tube

attack the tube with two glass syringe one at each side (make sure one of the glass syringe is extended fully and the other one isn't )

heat the phosphorus using the bunsen burner

use the syringes to pass the air, the some of the oxygen will react with the phosphorous to make phosphorous oxide.

During that the volume of oxygen will decrease.

Then calcualte the percentage of using the formula.

<p>place phosphorous in a tube </p><p>attack the tube with two glass syringe one at each side (make sure one of the glass syringe is extended fully and the other one isn't ) </p><p>heat the phosphorus using the bunsen burner </p><p>use the syringes to pass the air, the some of the oxygen will react with the phosphorous to make phosphorous oxide. </p><p>During that the volume of oxygen will decrease.</p><p>Then calcualte the percentage of using the formula. </p>
6
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define combustion

chemical reaction where substance reacts with oxygen

7
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what are the three combustion reactions that we have to know

magnesium

  • bright white light

  • forms magnesium oxide (white powder)

hydrogen

  • makes a Loud pop sound

  • forms water

sulfur

  • burns with a blue flame

  • forms sulfur dioxide

8
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define thermal decomposition

breaking down a substance using heat

9
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what is the equation of a metal carbonate when going through thermal decomposition

metal carbonate —> metal oxide + carbon dioxide

10
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what is the thermal decompsotionj reaction of copper carbonate

once it gets heated, it turns into carbon dioxide an copper oxide.

11
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define greenhouse affect

gases that trap the heat making the earth more warmer

12
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why does carbon dioxide cause climate change

becuase the carbon dioxide absorbs the infrared radiation, so more carbon dioxide means more heat in the earths atmosphere

13
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how could the earth increase carbon dioxide levels

burning fossil fuels

deforestation

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