Group 1 and group 7

• relative mass of neutron?

  1
• relative mass of proton?

  1
• What is meant by the term alloy?


  a mixture of metals
• A student is given an aqueous solution of chloride and an aqueous solution of potassium bromide

  Explain how he can use these two solutions to compare the reactivity of chlorine with the reactivity of bromine (4)

  -add chlorine to potassium bromide

  -turns orange

  -bromine is displaced

  -therefore chlorine more reactive than bromine
• How to memorise reactivity series

  Please

  Stop

  Laughing and

  Calling

  Me

  A

  Careless

  Zebra

  Instead

  Learn

  How

  Cops

  Save

  Gold and

  Platinum
• describe what happens to the particles in a solid when it is heated to the point of melting

  -Particles gain energy and vibrate more

  -This weakens the forces that hold the solid together and makes solid expand

  -At point of melting, particles have enough energy to break free from their positions
• State two properties of aluminium that make it suitable for saucepans used for cooking food

  -malleable-easily shaped

  -Conducts heat

  -does not react with food

  -does not corrode
• State name for a group of atoms held together by covalent bonds


  a molecule
• what is meant by term isotope?

  Different atomic forms of the same element which have the same number of protons but different number of neutrons
• relative mass of electron

  0.0005