FGCSE October 2024 Chemistry Assessment

Which of the below is an ionic compounds?

• Ni

• MgCl₂

• H₂O

• CH₄

How is an ionic bond formed?

• Sharing of electrons

• Delocalised electrons

• Transfer of electrons

An example of an ionic compound is Sodium Chloride, which is made from Na⁺ and Cl^- ions. Why do these ions form an ionic bond?

• They have like charges

• They are from the same group

• They are from the same period

• They have opposite charges

In the chemical formula for an ionic compound, which item is written first?

• positive ion
• negative ion
• subscript
• the female

Lead Chloride is an ionic compound, made up from Pb²⁺ ions and Cl^- ions. Which is the correct formula for this compound?

• PbCl₃

• PbCl

• PbCl₄

• PbCl₂

Which of the following is true for ionic bonding & ionic compounds? (3 correct statements)

• They must be made of ions with like charges.

• The negative ion must be written first.

• Compounds must have an overall charge of zero.

• They are made of metals and nonmetals.

• The positive ion must be written first.

Which properties are all characteristics of ionic compounds?

• solids with high melting and boiling points

• soft solids which are highly malleable

• when solid, the ions are held in place so the compounds cannot conduct electricity

• conduct electricity when dissolved or molten

What properties does an ionic compound have?

• A low boiling point and it conducts electricity when dissolved in water

• A high melting point and it conducts electricity when molten or dissolved

• A high boiling point and it conducts electricity when solid

Why do ionic compounds NOT conduct electricity when they are in their solid state?

• Their ions are free to move.

• Their ions are held in fixed positions.

• Their electrons are free to move

• Their electrons are held in a fixed state

Ionic compounds conduct electricity when dissolved in water. Which statement below best explains the property?

• Ions are free to move.

• Electrons are free to move.

• Bonds are strong.

• There are weak intermolecular forces of attraction.