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Chemistry AQA GCSE:
Structures

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You will need a copy of the periodic table!

1. Which properties are true for most metals?
  • A.   high density and high melting point
  • B.   high density and low melting point
  • C.   low density and high melting point
  • D.   low density and low melting point

2. What type of structure do both diamond and graphite have?

  • A.   giant ionic
  • B.   giant covalent
  • C.   giant metallic
  • D.   simple molecular

3. Nitrogen has a low boiling point because there are..

  • A.   weak covalent bonds between nitrogen atoms
  • B.   weak covalent bonds between nitrogen molecules
  • C.   weak forces between nitrogen molecules
  • D.   weak forces between nitrogen atoms

4. Rows A to D show the properties of 4 substances. Which substance is an ionic compound?

  Melting point Electrical conductivity when molten Solubility in water
A low good soluble
B low poor insoluble
C high good soluble
D high poor insoluble

 

5. Copper is the metal used in most electrical wiring because it is a very good conductor of electricity.

 

copper wires

Copper is a good conductor of electricity because it ...

  • A.   contains ions which are free to move
  • B.   contains atoms which are not free to move
  • C.   contains delocalized electrons which are free to move
  • D.   contains delocalized electrons which are not free to move

Q6-7:
Sodium and fluorine react to form the compound sodium fluoride.

Sodium Fluoride model

6. Which statement about the melting point of sodium fluoride is true?

Sodium fluoride has a ……

  • A.   .. low melting point as the forces between the ions are weak
  • B.   .. low melting point as the forces between the molecules are weak
  • C.   .. high melting point as the forces between the ions are strong
  • D.   .. high melting point as the forces between the atoms are strong
7. Which statement is true about the conduction of electricity by sodium fluoride?
  • A.   Sodium fluoride does not conduct in any state
  • B.   Sodium fluoride conducts when solid or molten
  • C.   Sodium fluoride conducts when solid or aqueous
  • D.   Sodium fluoride conducts when molten or aqueous.
8. Nitrogen and hydrogen gases react to produce ammonia, NH3. Ammonia is a gas at room temperature because ...
  • A. it is produced from two gases
  • B. there are weak covalent bonds between the nitrogen and hydrogen atoms
  • C. it consists of ions with weak attractions between them
  • D. it consists of neutral molecules with weak intermolecular forces
9. Alloys are typically stronger than pure metals because ...
  • A. the metallic bonding is stronger in alloys
  • B. the layers of metal atoms in the alloy cannot easily slide over each other
  • C. alloys are covalently bonded and covalent bonds are strong
  • D. the metals atoms are all very regularly arranged in alloys