1.5 Group 7: The Halogens Flashcards Preview

GCSE Chemistry 3.1 The Periodic Table > 1.5 Group 7: The Halogens > Flashcards

Flashcards in 1.5 Group 7: The Halogens Deck (19)
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1
Q

What are the structure of halogens?

A

Small molecules made up of pairs of atoms

2
Q

Describe the pattern of the boiling and melting points going down the halogen group

A

Starts low and increases as you go down

3
Q

What colour and state is fluorine at room temp?

A

Pale yellow gas

4
Q

What colour and state is chlorine at room temp?

A

Green gas

5
Q

What colour and state is bromine at room temp?

A

Red-brown liquid

6
Q

What colour and state is iodine at room temp?

A

Grey solid

7
Q

What does iodine easily evaporate to form?

A

A violet gas

8
Q

Why do the halogens have low melting and boiling points?

A

They have small molecules made of pairs of atoms

9
Q

What charge do halide ions always have?

A

-1

10
Q

How can halogens bond with other elements?

A
  • ionically with metals

* covalently with non metals

11
Q

What are formed when halogens bond covalently?

A

Molecules

12
Q

Describe the pattern of reactivity as you go down the halogen group

A

It decreases going down the group

13
Q

What can a more reactive halogen do to a less reactive halogen from an aqueous solution of a halide compound?

A

The more reactive halogen can displace the less reactive halogen

14
Q

How could you show that chlorine is more reactive than bromine?

A

Add choline solution to a solution of a metal bromide and bromine will be displaced by chlorine

15
Q

Why does the reactivity decrease as you go down the halogens?

A

The attraction between the outer electrons and the nucleus decreases as the number of occupied shells increases

16
Q

What type of element are the halogens?

A

Non metals

17
Q

What is shielding?

A

When the number of shells increases making it harder for another electron to be attracted because it is less reactive

18
Q

Why does the reactivity of a halogen depend on the attraction between the nucleus and the electrons?

A

The protons in the nucleus attract the electrons so if other electrons are shielding the nucleus then it is less reactive

19
Q

Why does the density of a halogen increase going down the group?

A

Because of the high increase in mass and the small increase in volume as you go down the table