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17 Cards in this Set
- Front
- Back
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What happens when hydrogen combusts in air? Chemical equation?
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Water is formed.
2H2 + O2 -> 2H2O |
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What colour does anhydrous copper (ii) sulphate turn in presence of water?
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White to blue
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What are the MP/BP of pure water?
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MP- 0 degrees
BP- 100 degrees |
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Test for hydrogen?
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Burns with a squeaky pop
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Describe the chemical test for chlorine
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Damp blue litmus paper in stream of chlorine gas
Red -> bleach white |
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Colour UI solution when chlorine is added?
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Bleach to colourless
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Lab prep of chlorine
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Concentrated HCl is dipped into flask containing solid potassium manganate, There is a green chlorine gas released
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Why are the halogens volatile?
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They have low BP
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Describe three trends down group 7
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RAM gets larger
MP/BP incease Forces between molecules get larger |
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What is the trend in reactivity down the group?
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It decreases
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Give the state at rtp, colour of gas and colour of vapour for
Fluorine Chlorine Bromine Iodine |
Fluorine; gas, yellow, yellow
Chlorine; gas, green, green Bromine; liquid, orange, orange Iodine; solid, dark grey, purple |
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What happens when a halogen reacts with a metal
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Salts are formed called halide ions
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Describe the test for a halide ion
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Halide ion + nitric acid + silver nitrate
Shake Cl- = White Br - = Cream I- = Yellow |
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Describe a displacement reaction between two halogens...
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Halogen A solution + Potassium halide B solution -> Potassium halide A + Halogen B
A has displace B and is more reactive |
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Three properties of hydrogen gas
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Colourless
More dense than air Soluble in water |
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What is the difference between hydrogen chloride and hydrochloric acid?
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Hydrochloric acid is hyrdogen chloride dissolved in water
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Why is hydrogen chloride acidic in water but not methylbenzene?
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Ions are formed when dissolved in water and these are what are responsible for the acidic properties of HCl acid.
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