Redox reactions in Group 7: disproportionation reactions Flashcards

1
Q

disproportionation is

A

the simultaneous oxidation and reduction of an element in a single reaction

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2
Q

chlorine water is

A

chlorine dissolved in water

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3
Q

bromine water is

A

bromine dissolved in water

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4
Q

when chlorine dissolves in water, two things happen

A
  • the dissolved chlorine forms chlorine water

- some of this dissolved chlorine reacts to form a mixture of two acids

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5
Q

the two acids formed when chlorine dissolves in water are

A
  • hydrochloric acid

- chloric(I) acid (old name is hypochlorous acid)

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6
Q

the formulae for hydrochloric and chloric(I) acids are:

A
  • HCl

- HOCl or HClO

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7
Q

the equation which shows what happens when chlorine dissolves in water is

A

Cl2 + H2O = HCl + HClO

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8
Q

use the equation for the dissolving of chlorine in water to show that chlorine undergoes disproportionation

A

Cl2 + H2O = HCl + HClO

0 -1 +1

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9
Q

when chlorine is added to a cold solution of dilute sodium hydroxide, it reacts to form

A

form a salt of the acids hydrochloric and chloric(I).

NaCl and NaClO (as well as water)

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10
Q

use the equation for the reaction between chlorine and dilute aqueous sodium hydroxide to show that chlorine is disproportionated

A

Cl2 + 2NaOH = NaCl + NaClO + H2O

0 -1 +1

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11
Q

sodium chlorate(I) (NaClO) is used as………………and is common in household……………..

A

used as a disinfectant and found in household bleach

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12
Q

when chlorine is added to hot concentrated sodium hydroxide solution, it reacts to form

A

sodium chloride and sodium chlorate(V)

NaCl and NaClO3

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13
Q

use the equation for the reaction between chlorine and hot concentrated sodium hydroxide solution to show chlorine is disproportionated

A

3Cl2 + 6NaOH = 5NaCl + NaClO3 + 3H2O

0 -1 +5

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14
Q

reduction is when the oxidation number

A

decreases

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15
Q

oxidation is when the oxidation number

A

increases

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16
Q

sodium chlorate(V) is used for………….and as a …………………………………………

A

bleaching and weed killer