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A3.2 - Group 7

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卡片总数: 24 张•内容版本: v4•公开卡包•更新时间: 8/1/2026

卡片预览 (24 张)

#1
正面 (问题)

Appearance and state at RTP: Flourine

背面 (解答)

F2 pale yellow gas

#2
正面 (问题)

Appearance and state at RTP: chlorine

背面 (解答)

Cl2 pale green gas

#3
正面 (问题)

Appearance and state at RTP: bromine

背面 (解答)

Br2 red-brown liquid

#4
正面 (问题)

Appearance and state at RTP: iodine

背面 (解答)

I2 grey solid

#5
正面 (问题)

Appearance and state at RTP: astatine

背面 (解答)

At2 black solid

#6
正面 (问题)

What is the trend in boiling point down group 7?

背面 (解答)

• more electrons • stronger London forces • more energy required to break the intermolecular forces • boiling point increases

#7
正面 (问题)

What sub-shells are the electrons in?

背面 (解答)

2 in s sub-shell 5 in p sub-shell

#8
正面 (问题)

What is the most common type of reaction of halogens?

背面 (解答)

redox reactions

#9
正面 (问题)

What happens to each halogen during redox reactions?

背面 (解答)

each halogen is reduced gaining 1 electron to form 1- halide ion halogen is called oxidising agent

#10
正面 (问题)

Where are halogen-halide displacement reactions carried out?

背面 (解答)

carried out on test tube scale

#11
正面 (问题)

What does halogen-halide displacement reactions show down group 7?

背面 (解答)

reactivity decreases down the group

#12
正面 (问题)

How is halogen-halide displacement reaction carried out?

背面 (解答)

a solution of each halogen is added to aqueous solutions of the other halides –> a reaction takes place, the halogen displacing the halide from solution –> the solution changes colour

#13
正面 (问题)

Colour of solution in water: Cl2

背面 (解答)

pale green

#14
正面 (问题)

Colour of solution in water: Br2

背面 (解答)

orange

#15
正面 (问题)

Colour of solution in water: I2

背面 (解答)

brown

#16
正面 (问题)

Halogen-halide displacement reaction: CL- + Br2

背面 (解答)

no reaction

#17
正面 (问题)

Halogen-halide displacement reaction: Cl- + I2

背面 (解答)

no reaction

#18
正面 (问题)

Halogen-halide displacement reaction: Br- + Cl2

背面 (解答)

orange colour from Br2 formation

#19
正面 (问题)

Halogen-halide displacement reaction: Br- + I2

背面 (解答)

no reaction

#20
正面 (问题)

Halogen-halide displacement reaction: I1 + Cl2

背面 (解答)

violet colour from I2 formation

#21
正面 (问题)

Halogen-halide displacement reaction: I- + Br2

背面 (解答)

violet colour from I2 formation

#22
正面 (问题)

Explain the trend in reactivity down group 7.

背面 (解答)

• atomic radius increases • shielding increases • less nuclear attraction • reactivity decreases

#23
正面 (问题)

Which halogen is the strongest oxidising agent?

背面 (解答)

flourine

#24
正面 (问题)

Define the term disproportionation.

背面 (解答)

redox reaction in which the same element is both oxidised and reduced