Topic 1

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True/False. Sodium, potassium and ammonium compounds are always soluble in water.
True. Sodium, potassium and ammonium compounds are soluble
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True/False. Nitrates are insoluble in water.
False. All the nitrates are soluble in water
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What two chlorides are insoluble in water?
Lead chloride and silver chloride
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What two sulphates are insoluble in water?
Lead sulphate and barium sulphate
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What compounds tend to be used in precipitation reactions
Ionic compounds because the ions are free roaming in solution
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Write the ionic equation for CuCl2+2NaOH---->Cu(OH)2+2NaCl
Cu(2+)+2OH(-)---->Cu(OH)2
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What is electronegativity?
Electronegativity is when there is a more negative charge than is expected around an atom eg. Oxygen
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What is the name of the reaction between aluminium and iron oxide?
The Thermit Reaction
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If oxidation occurs in a reaction, what also must take place?
Reduction, the processes are simultaneous
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True/False. Oxidation is the loss of electrons
True, when something is oxidised it loses electrons
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How do we know which iron sulphate is produced after a reaction with iron and copper sulphate?
By weighing the iron used and comparing it to the copper produced. There is a different number of moles.
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What is thermal decomposition?
When a compound is heated a breaks down into simpler compounds or elements
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What do metal carbonates decompose into?
A metal oxide and carbon dioxide
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What do metal sulphates decompose into?
A metal oxide and a mixture of different oxides and sulphur
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What do metal nitrates decompose into?
A metal oxide and a mixture of nitrogen dioxide and oxygen gases
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How does thermal stability vary down a group?
It increases due to the larger cations therefore less distortion and more stable compounds
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Why are group 1 more thermally stable?
Group 2 cations have a greater charge which causes greater distortions
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How is the thermal stability of nitrates measured?
1) how long it takes for oxygen to be produced. 2) how long it takes NO2 (brown gas) to be produced.
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How is the thermal stability of carbonates measured?
How long it takes for CO2 to be produced (bubbled through lime water)
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Explain why group 1 ans group 2 elements produce flame colours.
Electrons change energy levels due to the heat from the flame and then drop back down to lower energy levels. The colours are seen as they fall back down
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Other cards in this set

Card 2

Front

True/False. Nitrates are insoluble in water.

Back

False. All the nitrates are soluble in water

Card 3

Front

What two chlorides are insoluble in water?

Back

Preview of the front of card 3

Card 4

Front

What two sulphates are insoluble in water?

Back

Preview of the front of card 4

Card 5

Front

What compounds tend to be used in precipitation reactions

Back

Preview of the front of card 5
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