Chemistry Revision Questions

Ionic compounds conduct electricity when ……

• In an aqueous solution

• Molten

• Solid

Which of the following explains why metals can conduct electricity?

• Free moving electrons within a structure made up of metal cations

• Electrons rotating around the valence shell shared by two atoms

• Electrons transferred from one atom to another atom carrying negative charges

Simple covalent compounds are made up of two to three non-metal atoms, they are most commonly…

• Solids

• Liquids

• Gases

Do all simple covalent compounds form giant molecules?

• Yes

• No

Why do some simple covalent compounds cannot form large crystals?

• Because they are nonpolar molecules

• Because they are polar molecules

• Because they can only use London forces between their molecules.

• Because they can use Dipole - dipole and H-bond between their molecules.

Why are ionic compounds brittle?

• Because of the repulsion when same charge ions became close to each other upon hammering the compound.

• Because of the repulsion when different charge ions became close to each other upon hammering the compound.

• Because of the repulsion when free moving electrons became close to each other upon hammering the compound.

• Because of the repulsion when metal cations became close to each other upon hammering the compound.

Which statement best explains malleability in metals?

• The free moving electrons in the empty valence shells of metal cations throughout the metal solid.

• The metallic bond is the same in all directions throughout the solid where one metal atom can slide past another without breaking.

• The free moving electrons in the valence shell shared by two atoms.

• The metallic bond is more positive towards the middle of the metal structure that resist breaking.

What happens to the valence electrons in a metallic bond?

• Transferred from atom to another

• Shared by two atoms

• Delocalized within a structure of atoms

Which of the following statements is true?

• Silica is a giant molecule made up of one kind of atom, while silicon is a giant molecule made up of two kinds of atoms.

• Silica is a giant molecule made up of two kinds of atoms, while silicon is a giant molecule made up of one kind of atom.

• Silica is a simple covalent compound while silicon is a network covalent compound.

• Silica is a network covalent compound while silicon is a simple covalent compound.

Which of the following network covalent molecules is NOT made up of carbon?

• Diamond

• Graphite

• Glass