GCSE 1.3 Structures

What is the structure of sodium chloride:

• Molecular covalent model

• Giant ionic lattice model

• Metallic model

• Simple molecular model

Select a correct property for a giant ionic lattice:

• They are insoluble in water

• They are soluble in water

• They have low melting points

• They are poor conductors of electricity

What type of forces are van der Waals' forces?

• Strong ionic forces

• Weak intermolecular forces

• Strong covalent bonds

• Weak metallic bonds

Which of the following is true about many covalent molecular substances?

• They are soluble in water

• They are insoluble in water

• They have high electrical conductivity

• They have high melting points

Which of the following is NOT a property of the giant covalent structure of carbon (diamond and graphite)?

• Electrical conductivity

• Hardness

• Malleability

• Melting point and boiling point

What is an alloy?

• A pure metal

• A mixture of two or more elements, at least one of which is a metal

• A compound of metals

• A single element with metallic properties

What effect do different sizes of atoms in an alloy have on the metallic structure?

• They make it easier for layers to slide over each other

• They make it more difficult for layers to slide over each other

• They have no effect on the structure

• They make the alloy softer than pure metals

What is the composition of 24 carat gold?

• 100% pure gold

• 75% pure gold

• 50% pure gold

• 25% pure gold

How many covalent bonds can carbon form?

• Two

• Three

• Four

• Five

What type of bonds hold a giant ionic lattice together?

• Covalent bonds

• Ionic bonds

• Metallic bonds

• Hydrogen bonds