Halogens

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

What are the features of flourine

Back (Answer)

• Very pale yellow gas • Highly reactive

Front (Question)

What are the features of chlorine

Back (Answer)

• Greenish, reactive gas • Poisonous in high conce

Front (Question)

What are the features of bromine

Back (Answer)

• Red liquid • Gives off dense brown/orange poisonous fumes

Front (Question)

What are the features of iodine

Back (Answer)

• shiny grey solid sublimes to purple gas

Front (Question)

What is the trend in boiling and melting point as you go down group 7

Back (Answer)

• Increases down the group • Molecules get larger • More electrons and so have more van der waals forces between the molecules • More energy is required to break the van der waals forces.

Front (Question)

What is the trend in electronegativeas you go down group 7

Back (Answer)

• Electronegativity decreases • Atomic radius increases due to the increasing number of shells • Nucleus is therefore less able to attract the bonding pair of electrons

Front (Question)

Explain how displacement reactions of halide ions by halogens

Back (Answer)

• A halogen that is a strong oxidising agent will displace a halogen that has a lower oxidising power from one of its compounds.

Front (Question)

What is the trend of oxidising strength as you go down group 7?

Back (Answer)

• Oxidising strength decreases down the group

Front (Question)

What is an oxidising agent?

Back (Answer)

• Electron pair acceptors

#10

Front (Question)

What ions does chlorine displace

Back (Answer)

• bromide ions • Iodide ions

#11

Front (Question)

What ions does bromine displace

Back (Answer)

• ONLY iodide ions • NOT chloride ions

#12

Front (Question)

What ions does iodine displace

Back (Answer)

• NO ions

#13

Front (Question)

Explain the reaction when chlorine reacts with potassium chloride Give the observation

Back (Answer)

• NO reaction • As chlorine cant displace its own iodide • Observation - Pale green solution

#14

Front (Question)

Explain the reaction when chlorine reacts with potassium bromide Give the observation

Back (Answer)

• Chlorine displaces bromide ions • Observation - Yellow solution

#15

Front (Question)

Explain the reaction when chlorine reacts with potassium iodide Give the observation

Back (Answer)

• Chlorine displaces iodine ions • Observation - Brown solution

#16

Front (Question)

Explain the reaction when bromine reacts with potassium chloride Give the observation

Back (Answer)

• Yellow solution, no reaction

#17

Front (Question)

Explain the reaction when bromine reacts with potassium chloride Give the observation

Back (Answer)

• NO reaction • Bromine cannot displace chloride ions • Observation - yellow solution

#18

Front (Question)

Explain the reaction when bromine reacts with potassium bromide Give the observation

Back (Answer)

• NO reaction • Bromine cannot displace bromide ions • Observation - Yellow soluton

#19

Front (Question)

Explain the reaction when bromine reacts with potassium iodide Give the observation

Back (Answer)

• Bromine displaces iodide ions • Observation - Brown solution

#20

Front (Question)

Explain the reaction when iodine reacts with potassium chloride, potassium bromide and potassium iodide Give the observation

Back (Answer)

• NO reaction for all reactions • Observation - Brown solution

#21

Front (Question)

What gives the colour of the solution in a displacement reaction

Back (Answer)

• The free halogen present in the solution

#22

Front (Question)

What colour is the solution where chlorine is the free halogen?

Back (Answer)

• pale green solution

#23

Front (Question)

What colour is the solution where bromine is the free halogen?

Back (Answer)

• Yellow solution

#24

Front (Question)

Show the ionic equation of chlorine reacting with bromide ions

Back (Answer)