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21 Cards in this Set
- Front
- Back
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Group 7 metals physical properties (3) |
- Low melting and boiling points - Exist as diatomic molecules - Boiling pt increases as you go down the group |
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Describe the reactivity of Group 7 metals |
- Reactivity decreases as you go down the group - Atomic radii increases - Shielding increases - The attraction between the nucleus and the outer electrons decreases - Ability to gain an electron decreases to form a halide ion. |
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Why does the boiling point increase as you go down the group? |
- The number of electrons increases - The number of van der Waal's forces increases - Hence, more energy is required to break the bonds as you go down the group. |
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What is a Displacement Reaction? |
A reaction in which the more reactive element displaces the less reactive element and forms an aqueous solution with the latter's ions. |
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Colour of Chlorine in Water and Cyclohexane |
Pale - green (in both) |
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Colour of Bromine in Water and Cyclohexane |
Orange (in both) |
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Colour of Iodine in Water and Cyclohexane |
- Water: Brown - Cyclohexane: Purple |
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What is a Disproportionation reaction? |
The oxidation and reduction of the same element in a redox reaction. |
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Advantage of Chlorine |
Effective bacteria killer |
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Disadvantage of Chlorine |
Toxic |
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What is the symbol equation of how Chloric (I) Acid is made? |
Cl2 + H2O ----------> HClO + HCl |
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What is NaClO |
Sodium (I) Chlorate- Household Bleach |
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Give the equation for Bleach |
Cl2 + 2NaOH --------> NaCl + NaClO + H2O |
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Give the equation for hot concentrated bleach |
3Cl2 + 6NaOH -------> 5NaCl + NaClO3 + 3H20 |
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What is a precipitation reaction? |
Formation of a solid during a chemical reaction. |
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Cl- ions in AgNO3 |
White precipitate |
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Br- ions in AgNO3 |
Cream precipitate |
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I- ions in AgNO3 |
Yellow precipitate |
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What do Cl- ions dissolve in? |
Dilute NH3 solution |
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What do Br- ions dissolve in? |
Concentrated NH3 solution |
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What do I- ions dissolve in? |
Insoluble in both dilute and concentrated NH3 solution |
