Atoms Combining

Which statement about gaseous hydrogen chloride and solid potassium chloride is correct?

• Hydrogen chloride is covalent but potassium chloride is ionic.

• Hydrogen chloride is ionic but potassium chloride is covalent.

• They are both covalent compounds.

• They are both ionic compounds.

What is the total number of electrons used for bonding in this molecule?

• 2

• 4

• 8

• 10

In which compounds are pairs of electrons shared between atoms?

• sodium chloride

• methane

• lead bromide

P and Q react to form an ionic compound.

What is the formula of this compound?

• PQ₂

• P₂Q

• P₂Q₆

• P₆Q₂

Which is a simple covalent molecule?

• A

• B

• C

• D

The table contains information about four substances.

Which substance is potassium chloride?

• A

• B

• C

• D

Which two elements react together to form an ionic compound?

• W and X

• Y and Z

• W and Z

When sodium chloride is formed from its elements,

each chlorine atom ………… one ………….

Which words correctly complete the gaps?

• gains, proton

• gains, electron

• loses, proton

• loses, electron

Strontium, Sr, is a metal that forms an ionic chloride, SrCl₂.

Sulphur, S, is a non-metal that forms a covalent chloride, SCl₂.

Which compound is likely to have the higher melting point?

• SrCl₂

• SCl₂

Strontium, Sr, is a metal that forms an ionic chloride, SrCl₂.

Sulphur, S, is a non-metal that forms a covalent chloride, SCl₂.

Which compound is likely to be insoluble in water?

• SrCl₂

• SCl₂