learn it sheet - topic 4

• metal + oxide 


  metal oxide
• oxidation


  loss of electrons
• reduction


  gain of electrons
• order of reactivity

  potassium, sodium, lithium calcium, magnesium, aluminium, carbon, zinc, iron, tin, lead, hydrogen, copper, silver, gold, platinum
• which metals react with cold water?

  group 1 - alkali metals
• metal + water


  metal hydroxide + hydrogen
• how could we test for metal oxides?

  hydroxides are alkalis - turn universal indicator purple
• how to test for hydrogen gas?

  burns with a squeaky pop
• reaction of metals and water

  • alkali metals float, move over the surface, fizz and bubble (effervesce)
  • calcium sinks, fizzes, bubbles
  • get smaller and disappear
  • colourless solution is produces
  • sodium and potassium melt into a sphere
  • potassium catches fire with a lilac flame
• metal + acid

  salt + hydrogen gas
• reaction of metals and acids

  • fizzing/bubbling
  • metals get smaller and disappear
  • colourless solution is produced
  • temperature increases - exothermic reaction
  • only metals more reactive than hydrogen react with acids
• what pH are salts?

  pH 7
• salt from hydrochloric acid

  chloride
• acid to make sulfate salt

  sulfuric acid