C6 Groups in the periodic table

Question 1

What is the state and colour of chlorine at room temperature?

Answer 1

• gas

- pale green

Question 2

What is the state and colour of bromine at room temperature?

Answer 2

• liquid

- reddish brown

Question 3

What is the state and colour if iodine at room temperature?

Answer 3

• solid

- grey

Question 4

What is the colour if iodine in gaseous state?

Answer 4

violet

Question 5

What is the name of elements in Group 7?

Answer 5

halogens

Question 6

What happens to the melting+boiling points of group 7 as you go down the group?

Answer 6

increases

Question 7

What happens to state of matter as you go down group 7?

Answer 7

gas –> liquid –> solid

Question 8

What happens to the colour as you go down group 7?

Answer 8

darkens

Question 9

What happens to the density as you go down group 7?

Answer 9

increases

Question 10

What happens to group 7 elements’ reactivity as you go down the group?

Answer 10

decreases

Question 11

Why does group 7 elements’ reactivity decrease as you go down the group?

Answer 11

• as you go down group 7, atoms get larger
• outer electrons become further from nucleus
• force of attraction between nucleus and the outer electrons decreases
• harder to attract more electrons to fill outer shell

Question 12

What is the test for chlorine gas?

Answer 12

• damp,blue litmus paper

- turns red then bleach white if chlorine is present

Question 13

What is formed when halogens react with metals?

Answer 13

halogen + metal –> metal halide

Question 14

What does halogens reacting with hydrogen form?

Answer 14

halogen + hydrogen –> hydrogen halide

Question 15

Hydrogen halides are _______ meaning when they dissolve they form ______ solutions (they contain __ ions)

Answer 15

• soluble
• acidic
• H+

Question 16

What colour would an acidic solution turn if universal indicator was added?

Answer 16

red/orange/yellow

Question 17

Why are halogen reactions considered to be displacement reactions?

Answer 17

• more reactive group7 element
• displaces
• less reactive group7 element

-from solution of its salts

Question 18

What is the difference between oxidisation and reduction?

Answer 18

OIL RIG

Oxidation
Is
Loss of electrons

Reduction
Is
Gain of electrons

Question 19

What must occur in redox reactions?

Answer 19

oxidisation and reduction

Question 20

What are oxidation-reduction reactions called?

Answer 20

redox reactions

Question 21

6 marker:
The order of reactivity of chlorine, bromine and iodine can be determined by carrying out displacement reactions.

Explain how displacement reactions can be used to show the reactivity of these three elements.

Answer 21

order of reactivity:
chlorine > bromine > iodine

suitable experiments:
chlorine>bromine
-add chlorine to solution of potassium bromide
-solution turns orange/yellow
-bromine is produced/[balanced equation]
-so chlorine is more reactive as it displaces bromine /oxidises bromide ions

bromine>iodide

• add bromine to solution of potassium iodide
• solution turns yellow/red/brown
• iodine is produced/[balanced equation]
• bromine is more reactive as it displaces iodine /oxidises iodide ions

chlorine>iodine

• add chlorine to solution of potassium iodide
• solution turns yellow/red/brown
• iodine is produced/[balanced equation]
• chlorine is more reactive as it displaces iodine /oxidises iodide ions