Group 7 Halogens Flashcards Preview

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Flashcards in Group 7 Halogens Deck (18)
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1

Trend in atomic radius from F to I

Increases

2

Trend in boiling point from F to I

Increased

3

Trend in electronegativity from F to I

Decreases

4

Trend in oxidising power from F to I (explain)

Decreases.
The oxidising ability is linked to the size of the halogen.
Smaller halogens are more electronegative (because smaller distance btw nucleus + outer shell)
Therefore they have a better ability of gaining electrons.

5

Displacement reaction between Br2 and Cl-

Stays yellow (no reaction)

6

Displacement reaction between I2 and Cl-

Stays brown (no reaction)

7

Displacement reaction between Cl2 and Br-

Yellow solution (Br2) formed.
Cl2 + 2Br- —> 2Cl- + Br2

8

Displacement reaction between I2 and Br-

Stays brown solution (no reaction)

9

Displacement reaction between Cl2 and I-

Brown solution (I2) formed.
Cl2 + 2I- —> 2Cl- + I2

10

Displacement reaction between Br2 and I-

Brown solution (I2) formed.
Br2 +2I- —> 2Br- +I2

11

Trend in reducing ability from F to I

Increases

12

NaCl + H2SO4 (observation, product(s), type of reaction)

Observe - steamy fumes
Product - HCl
Reaction - Acid-Base

13

NaBr + H2SO4 (observation, product(s), type of reaction)

Steamy fumes (HBr) (Acid-Base)
Brown fumes (Br2) (Redox)
Colourless gas (SO2) (Redox)

14

NaI + H2SO4 (observation, product(s), type of reaction)

Steamy fumes (HI) (Acid-Base)
Purple fumes/Black solid (I2) (Redox)
Colourless gas (SO2) (Redox)
Yellow solid (S) (Redox)
Bad egg smell (H2S) (Redox)

15

Chlorine in water (equation)

Cl2 + H2O HCl + HOCl

(Disproportionation)

16

Observation of pH paper in chlorine water

Turns red (because acidic) then bleaches white

17

Uses of chlorine

In swimming pools + drinking water to kill bacteria + disinfect/sterilise water

18

Chlorine with cold NaOH (aq) (equation + use)

Cl2 + 2NaOH —> NaCl + NaOCl + H2O

(Disproportionation)

Products used commercially for bleach