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Chemistry- LAS > Group 7 > Flashcards

Group 7 Flashcards

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1
Q

Observation of Cl2 + Br-

A

Yellow solution (Br2) forms

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2
Q

Equation Cl2 + Br-

A

Cl2 + 2Br- —> 2Cl- + Br2

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3
Q

Observation Cl2 + I-

A

Brown solution forms (I2 forms)

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4
Q

Equation Cl2 + I-

A

Cl2 + 2I- —> 2Cl- +I2

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5
Q

Observation Br2 + Cl-

A

Stays yellow solution (no reaction)

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6
Q

Observation Br2 + I-

A

Brown solution forms (I2 forms)

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7
Q

Equation Br2 + I-

A

Br2 + 2I- —> 2Br- +I2

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8
Q

Observation I2 + Cl-

A

Stays brown solution (no reaction)

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9
Q

Observation I2 + Br-

A

Stays brown solution (no reaction)

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10
Q

What state are all reactants in?

A

Aq

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11
Q

Reaction of chlorine and water

A

Cl2 (aq) + H2O(l) <—> HCl (aq) + HClO(aq)

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12
Q

What type of reaction is chlorine + water?

A

Disproportionation- chlorine gets both oxidised and reduced

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13
Q

How to make bleach?

A

Chlorine gas mixed with cold, dilute, aqueous sodium hydroxide

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14
Q

Equation to make bleach?

A

2NaOH (aq) + Cl2 (g) <—> NaClO (aq) + NaCl (aq) + H2O (l)

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15
Q

Cl- reaction with H2SO4- product & observation

A

HCl- steamy (white fumes)

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16
Q

Cl- equation of reaction and type of reaction

A

NaCl + H2SO4 —> NaHSO4 + HCl. (Acid-base)

17
Q

Br- products & observations

A

HBr- steamy fumes
Br2- brown fumes
SO2- colourless (choking) gas

18
Q

Products of I- reaction

A

HI- steamy fumes
I2- purple fumes
SO2- colourless gas
S- yellow solid
H2S- gas (bad egg smell)

19
Q

What happens when water + chlorine in sunlight

A

Chlorine decomposes water to form chloride and oxygen

20
Q

Reaction of chlorine + water in sunlight

A

2Cl2 (g) + 2H2O (l) <—> 4H+ (aq) + 4Cl- (aq) + O2 (g)

21
Q

Half equation of H2SO4 to form SO2

A

H2SO4 + 2H+ + 2e- —> SO2 + 2H2O

22
Q

Half equation for H2SO4 to form S

A

H2SO4 + 6H+ + 6e- —> S + 4H2O

23
Q

Half equation for formation of H2S from H2SO4

A

H2SO4 + 8H+ +8e- —> H2S + 4H2O

Chemistry- LAS (2 decks)

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