2.3 Group 7

Question 1

Atomic Radius

Answer 1

increases

more energy levels

Question 2

Ionization Energy

Answer 2

decreases
more energy levels
larger radius, less shielding
less attraction of valence e and nucleus

Question 3

Electronegetivity

Answer 3

decreases
more energy levels
larger radius, less shielding
less attraction of valence e and nucleus

Question 4

Boiling Point

Answer 4

Increases
larger molecules, stronger vdw between molecules
need more energy to overcome

Question 5

Reaction (displacement) with conc H2SO4

Answer 5

NaX+H2SO4–> NaHSO4 +HX

Question 6

Halide Test

Answer 6

+HNO3 (displace CO3 ions)
+NaOH (neutralize)
+AgNO3 (f dissolve, cl white, br cream, I yellow)
+dilute/conc NH3

Question 7

Making Bleach

Answer 7

Cl2+2NaOH NaClO+ NaCl+H2O

Question 8

Reaction (reduction) with conc H2SO4

Answer 8

SO4–> SO2/S/H2S

Question 9

Product Identification of reaction with H2SO4

Answer 9

HX (misty fume)
Br2 (orange gas) I2 (purple gas/black solid)
SO2 (colourless, toxic)
S (yellow solid)
H2S (rotten egg smell)

Question 10

Cl in water

Answer 10

Cl2+H20 –> HClO+HCl

Question 11

Colours!!!

Answer 11

F2 (pale yellow, react with water)
Cl2 (green, pale green dissolved)
Br2 (red/brown, orange dissolved)
I2 (grey, brown dissolved)