Y3 Chemical Bonding Revision

A substance has a high melting point and does not conduct electricity in any state. Which is likely to be its structure?

• Giant ionic structure

• Giant metallic structure

• Simple molecular structure

• Giant molecular structure

Which substance has both ionic and covalent bonding?

• sodium nitride

• potassium nitrate

• nitrogen dioxide

• sodium

What is likely to be the structure of a substance with melting point -7.2 ^oC and can dissolve in organic solvents?

• Giant ionic structure

• Simple molecular structure

• Giant molecular structure

• Giant metallic structure

What particles is a substance that can conduct electricity in any state made of?

• atoms

• simple molecules

• Positive and negative ions

• Positive ions and 'sea' of delocalised valence electrons

Which is true about silicon dioxide?

• it has a simple molecular structure

• it can conduct electricity in molten state

• it has a very high melting point

• it is soluble in water

What is overcome when dry ice (solid carbon dioxide) sublimes?

• Strong covalent bonds between atoms

• Weak intermolecular forces of attraction between molecules

• Strong electrostatic forces of attraction between cations and anions

• Strong electrostatic forces of attraction between cations and 'sea' of delocalised valence electrons

The substance is a gas a r.t.p. Which structure is it likely to have?

• Simple molecular structure

• Giant molecular structure

• Giant ionic structure

• Giant metallic structure

Which statement is true?

• All ionic compounds are soluble in water

• All covalent substances have low melting point

• All simple molecules cannot dissolve in water

• All metals can conduct electricity

Which is not true about graphite?

• it is an allotrope of carbon

• each atom has strong covalent bonds with three other atoms

• atoms are bonded in a tetrahedral arrangement

• there are weak intermolecular forces of attraction between layers

What is a possible use of magnesium oxide?

• Used as drill tips and polishing tools

• Used as lubricant to reduce friction in machinery

• Used in perfumes and deodorants

• Used as a refractory material in furnances