C5 - Chemicals in the natural environment
A summary of Twenty first Century Science C5 topic
- Created by: dmistry02
- Created on: 09-06-14 19:09
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- C5 - Chemicals of the natural Environment.
- The Atmosphere
- 78% Nitrogen, 21% Oxygen, 1% Argon, 0.04% CO2
- Molecules in the atmosphere have low melting and boiling points.
- Covalent Bond
- Sharing electrons
- Making a full outer shell.
- Bond due to electrostatic attraction between positive nuclei and negative electron.
- The Hydrosphere
- Oceans, seas, lakes, rivers, puddles.
- Compounds dissolved in water such as ionic compounds (salt)
- Solid ionic compounds form crystals
- Giant 3-D lattice
- Very strong chemical bonds
- Ions with opposite charge create strong attraction.
- Charged compounds called ions.
- high melting and boiling point
- Can conduct energy when molten or dissolved
- Electrons are free to move and transfer energy.
- The Lithosphere
- Made from a mixture of minerals
- Carbon forms giant covalent structures.
- Diamond
- 4 covalent bonds
- very rigid
- Hardest natural substance
- High Melting and boiling point
- Strong covalent bonds
- Does not conduct
- No free electrons.
- Insoluble
- Graphite
- 3 Covalent bonds
- sheets of carbon ( slide over each other)
- Layers are loose
- high melting points
- strong covalent bonds
- Conducts
- spare electrons.
- Diamond
- Identifying ions.
- Negative Ion
- Hydrochloric acid helps detect carbonates
- Lime water goes cloudy.
- Barium chloride detects sulphates
- White precipitate.
- add dilute HCL, followed by barium chloride.
- Test for halides
- add dilute nitric acid followed by silver nitrate solution.
- Chloride- White precipitate
- Bromide - Cream precipitate
- iodide - yellow precipitate
- add dilute nitric acid followed by silver nitrate solution.
- Hydrochloric acid helps detect carbonates
- Positive Ion
- Flame test
- Sodium hydroxide
- Negative Ion
- Extraction of metal
- Reduction by adding carbon or carbon monoxide.
- Electrolysis
- Splitting up with electricity.
- Electrolyte conducts electricity.
- Positive ions (metal) attract to negative electode.
- Negative ion (non-metal) to positive electrode.
- Relative Atomic mass/ Relative Formula mass x mass of ore.
- Relative atomic mass - top number on periodic table
- Relative formula mass - atomic mass added together.
- Metals
- Conduct
- Metallic bonds free electrons
- Strong and malleable.
- High melting and boiling point.
- Conduct
- The Atmosphere
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