Chemistry Chapter 4 - Part 1
- Created by: elliebaxter
- Created on: 26-01-17 12:11
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- Chemistry Chapter 4 - Part 1
- Gases in the atmosphere
- Nitrogen -78% Oxygen -21% Argon -0.9% Carbon dioxide - 0.04%
- Fractional distillation
- 1) First condense air into liquid by compressing and releasing the pressure (-200)
- 2) CO2 and water (solids) removed
- 3) Column is colder at bottom so nitrogen boils off first (gas)
- 4) Oxygen separated off as a liquid at bottom
- 5) Argon collected between oxygen and nitrogen
- 4) Oxygen separated off as a liquid at bottom
- 3) Column is colder at bottom so nitrogen boils off first (gas)
- 2) CO2 and water (solids) removed
- 1) First condense air into liquid by compressing and releasing the pressure (-200)
- Uses of gases
- Liquid nitrogen (cold) - storing sperm
- Nitrogen gas (unreactive) - storing foods and making ammonia
- Oxygen - helping people to breathe and making things react
- Oxygen and oxides
- Test for oxygen = relighted glowing splint
- Metal + oxygen = solid oxide
- Non-metal + oxygen = gas oxides
- + oxygen = oxidation
- - oxygen = reduction
- Metal oxide dissolved in water = alkaline
- Non-metal oxide dissolved in water = acid
- Bases - metal oxides that don't dissolve in water
- Amphoteric oxides - react like acids and bases
- Gases in the atmosphere
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