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Chemistry > 2(c) Gases in the Atmosphere > Flashcards

2(c) Gases in the Atmosphere Flashcards

1
Q

Gases in the atmosphere

A
  • Nitrogen
  • Oxygen
  • Argon
  • Carbon Dioxide
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2
Q

Percentage of Nitrogen

A

78%

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3
Q

Percentage of Oxygen

A

20%

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4
Q

Percentage of Carbon Dioxide

A

0.04%

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5
Q

Percentage of Argon

A

0.9%

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6
Q

Determining % oxygen in atmosphere using copper

A

2 gas syringes
Copper in the middle

Known volume of air is passed back and forth over the heated copper
As CuO forms, oxygen in air is used up

When reaction is complete, only 80% of the gas remains

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7
Q

Determining % oxygen in atmosphere using iron

A

Put iron wool at bottom of measuring cylinder and invert it in a trough of water

Increase in water level in trough

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8
Q

Determining % oxygen in atmosphere using rusting of iron

A

Put wet iron filings into conical flask which is connected to a gas syringe by a connecting tube

Difference in volume

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9
Q

Determining % oxygen in atmosphere using Phosphurus (non-metals)

A

Put evaporating basin with phosphurus on top of after and light on flame then cover with bell jar

Measure rise in water level when flame is out

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10
Q

Combustion of elements in oxygen: Magnesium

A
  • White flame
  • Produces MgO
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11
Q

Combustion of elements in oxygen: Sodium

A
  • Yellow flame
  • Produces Na2O
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12
Q

Combustion of elements in oxygen: Sulfur

A
  • Blue flame
  • Yellow powder - brown liquid
  • Produces SO2
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13
Q

Combustion of elements in oxygen: Hydrogen

A
  • Explodes to form water
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14
Q

Thermal Decomposition of Metal Carbonates: Copper Carbonate

A

Copper carbonate -> Carbon dioxide + Copper Oxide

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15
Q

Greenhouse Gases

A
  • CO2
  • Water
  • Methane
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16
Q

Greenhouse Effect

A

Maintains temperature on Earth enough to support life.

  1. Infrared radiation from the sun passes through the Earth’s atmosphere
  2. Earth absorbs some so warms up. Some is radiated out from Earth, and some is absorbed by greenhouse gases
  3. Atmosphere warms up -> climate change
17
Q

Impacts of climate change

A
  • More frequent heat waves
  • Heavy rains
  • Icebergs melt - sea levels rise
  • Loss of habitat

Chemistry (28 decks)

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