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17 Cards in this Set
- Front
- Back
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What is another name for group 7 elements |
Halogens |
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At room temperature what is the colour and physical state of: Fluorine Chlorine Bromine Iodine |
Pale yellow gas Green gas Red-brown liquid Grey solid |
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How are the halogens bonded What type of molecule are they |
Covalenty bonded Diatomic molecules i.e. F2 Cl2 Br2 I2 |
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What is the trend of boiling points in halogens Why is it like this |
The boiling point of halogens increases going down the group The strength of Van Der Waals forces increases as the size and relative mass increases due to the number of shells increasing This requires more energy to break |
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What are Van Der Waals forces What is another name for this |
A type of intermolecular force caused by temporary dipoles Which causes all atoms and molecules to be attracted to each other Also called dipole-dipole forces or London forces |
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What is electronegativity Describe the electronegativity of halogens |
The tendency of an atom to attract a bonding pair of electrons They are highly electronegative elements |
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What is the trend of eletronegativity in halogens Why is it like this |
Electronegativity decreases going down the group Larger atoms attract less electrons than smaller atoms The outer electrons are further away from the nucleus and are more shielded |
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Describe the reactivity of halogens |
They are less reactive going down the group Atoms become larger and outer shells get further away from the nucleus So they become less oxidising |
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What is a displacement reaction |
A reaction where a more reactive element pushes out a less reactive element and takes it place |
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What can displacements be used to find out |
Identifying which halogen or halide is present in a solution |
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In solution what colour are halide ions |
Colourless |
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What colour is: Chlorine water Bromine water Iodine solution |
Colourless Orange Brown |
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What colour is: Potassium chloride solution Potassium bromide solution Potassium iodide solution |
Colourless Colourless Colourless |
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Potassium chloride solution + chlorine water +bromine water +iodine solution |
No reaction No reaction No reaction |
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Potassium bromide solution + chlorine water +bromine water +iodine solution What types of reactions are these |
Orange solution formed (Br2) displacement reaction No reaction No reaction |
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Potassium iodide + chlorine water +bromine water +iodine solution What types of reactions are these |
Brown solution formed (I2) displacement reaction Brown solution formed (I2) displacement reaction No reaction |
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What is the ionic equation for Cl2(aq) +2KI(aq) -- 2KCL(aq) + Br2(aq) |
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