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20 Cards in this Set
- Front
- Back
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Oxidising power |
Back (Definition)
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Explain trend in bond enthalpy down Group 7 |
Cl2 to I2 - decreases down the group as atomic radius increases -> greater shielding -> weaker attraction between the bonding electrons and the nucleus.
F2 does not fit the trend - atoms are so close together that the lone bonding pair of electrons for each atom causes repulsion |
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State and explain trend in boiling points down Group 7 |
Boiling points increases down the group Size of diatomic molecule increases -> bigger Van der Waals forces -> more energy needed to overcome VdW forces |
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State and explain trend in electronegativity down Group 7 |
Decreases down the group. Bonding electrons closer to the nucleus -> less shielding -> nucleus attracts bonding pair of electrons more strongly
So element has greater electronegativity |
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State the trend in appearance in Group 7 |
Colour of the elements gets darker down the group |
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Trying out the tests |
Back (Definition) |
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Trying out the tests |
Back (Definition) |
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Oxidising power |
Back (Definition) |
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Reducing power |
Back (Definition) |
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Uses of Chlorine |
Safe - low concentrations used
Purify drinking water &assuming pools
HClO chloric (I) acid - kills microorganisms |
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Disproportionation reaction |
Type of redox reaction where an element in the reaction undergoes oxidation and reduction simultaneously, forming 2 products. |
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Disproportionation reaction |
Type of redox reaction where an element in the reaction undergoes oxidation and reduction simultaneously, forming 2 products. |
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Redox reaction |
Reaction where both reduction and oxidation occur |
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Disproportionation reaction |
Type of redox reaction where an element in the reaction undergoes oxidation and reduction simultaneously, forming 2 products. |
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Redox reaction |
Reaction where both reduction and oxidation occur |
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Reducing agent |
An electron donor |
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Disproportionation reaction |
Type of redox reaction where an element in the reaction undergoes oxidation and reduction simultaneously, forming 2 products. |
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Redox reaction |
Reaction where both reduction and oxidation occur |
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Reducing agent |
An electron donor |
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Oxidising agent |
An electron acceptor |
