Group 7

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

Card preview (24)

Front (Question)

Identify a reagent that could be used to indicate the presence of iodide ions in an aqueous solution and describe the observation made.

Back (Answer)

AgNO3 yellow ppt or Cl2 or Br2brown solution/black ppt

Front (Question)

What type of molecules are group 7 under normal conditions?

Back (Answer)

Diatomic molecules e.g. F2, Cl2, Br2

Front (Question)

What are group 7 ions called?

Back (Answer)

• When they gain an electron to form 1- ions • called halides e.g. F-, Cl-, Br-

Front (Question)

Describe fluorine at room temperature

Back (Answer)

pale yellow gas

Front (Question)

Describe chlorine at room temperature

Back (Answer)

pale green gas

Front (Question)

Describe bromine at room temperature

Back (Answer)

• orange/brown liquid • vaporises easily into an orange gas

Front (Question)

Describe iodine at room temperature

Back (Answer)

• black solid • vaporises to purple gas when heated

Front (Question)

describe what happens to group 7 elements as you go down the group?

Back (Answer)

become darker and denser

Front (Question)

describe trend in atom size as you go down group 7

Back (Answer)

• atoms get bigger • shielding increases

#10

Front (Question)

describe trend in electronegativity as you go down group 7

Back (Answer)

electronegativity decreases

#11

Front (Question)

what 3 factors does electronegativity of group 7 elements rely on?

Back (Answer)

• nuclear charge • atomic radius • shielding

#12

Front (Question)

How does nuclear charge, atomic radius and shielding affect electronegativity?

Back (Answer)

• greater nuclear charge = withdraw electrons more strongly • shorter atomic radius = helps withdraw electrons more strongly • more shielding = reduce amount of electrons that can be withdrawn

#13

Front (Question)

What is the most electronegative element of group 7?

Back (Answer)

Fluorine

#14

Front (Question)

What is the least electronegative element of group 7?

Back (Answer)

Iodine

#15

Front (Question)

What type of IMF exists between group 7 molecules?

Back (Answer)

Van Der Waals

#16

Front (Question)

What can halogens act as?

Back (Answer)

Oxidising agents

#17

Front (Question)

What is the strongest oxidising agent of group 7?

Back (Answer)

• Fluorine • accepts electrons most easily

#18

Front (Question)

What is the weakest oxidising agent of group 7?

Back (Answer)

• Iodine • accepts electrons least easily

#19

Front (Question)

What happens during displacement reactions?

Back (Answer)

• highest element in group 7 forms halide ion • halogen lowest down group 7 forms halogen molecule

#20

Front (Question)

Displacement reaction between chlorine and sodium bromide

Back (Answer)

Cl2 (aq) + 2NaBr (aq) —> 2NaCl (aq) + Br2 (aq) OR Cl2 (aq) + 2Br (aq) —> 2Cl- (aq) + Br2 (aq)

#21

Front (Question)

Reaction between potassium fluoride and chlorine

Back (Answer)

• no reaction • F is higher than Cl • F exists as ions • Cl exists as molecules

#22

Front (Question)

Chlorine reacts with cold, dilute, aqueous sodium hydroxide. Give a complete list of the names of the products?

Back (Answer)

• sodium chlorate (I) • sodium chloride • water

#23

Front (Question)

What type of solution is formed when chlorine is added to water

Back (Answer)

acidic

#24

Front (Question)

Why is chlorine added to water?

Back (Answer)

to kill bacteria