Welcome to the Quiz!

This quiz contains 7 questions from a mix of 1 subtopics.

Colours and physical states of the halogens at room temperature


solid / gas / liquid / green / yellow / grey


  1. Fluorine is a poisonous coloured gas and is the most reactive halogen
  2. Chlorine is a coloured gas.
  3. Bromine is a red-brown volatile which is also poisonous. 
  4. Iodine is a coloured solid with purple vapours. 
yellow
green
liquid
grey

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4

Which two of these properties are seen in group 7 elements?

They can form covalent bonds with other non-metals

Reactivity increases down the group

They exist as single atoms

Their ions usually have a 1- charge

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2

Do the melting and boiling points of the halogens increase or decrease as you go down the group?

Increase

Decrease

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1

Periodic table with Group 7 elements highlighted in blue.

Based on the reactivity of the halogens, which of these displacement reactions is possible?

2HBr + F2  ➔ 2HF + Br2

2HF + Cl2  ➔ 2HCl + F2

2HCl + I2  ➔ 2HI + Cl2

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1

Diagram showing a diatomic chlorine molecule with two chlorine atoms sharing electrons to form a covalent bond.

double / diatomic / covalent / ionic


The halogens exist as molecules, meaning each molecule consists of two atoms.


The two atoms are joined by a bond, which allows each atom to share an electron, giving each atom a full outer shell.

diatomic
covalent

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2

Are noble gases flammable?

No

Yes

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1

Why are the noble gases inert?

('inert' means chemically unreactive)

The atoms have a full outer shell of electrons

They form colourless gases

The atoms are non flammable

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1