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Chemistry Edexcel 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. The melting point of calcium chloride is much higher than that of water

State the type of bonding in calcium chloride and in water.

 
  Calcium chloride water
A ionic covalent
B ionic ionic
C covalent covalent
D covalent ionic