chemical changes

• what number on the pH scale is acids?

  0-6
• what number on the pH scale is neutral?

  7
• what numbers on the pH scale is alkalis?

  8-14
• what are the two ways to measure pH?

  • universal indicator
  • pH probe
• what are the neutralisation reactions

  acid + base --> salt + water
• how do you get soluble salts?

  adding metals or insoluble metal compounds into acids
• what is oxidation?

  gain of oxygen
• what is reduction?

  loss of oxygen
• what is the most reactive on the reactivity series?

  potassium
• what is the least reactive on the reactivity series?

  copper
• what is a displacement reaction?

  when a more reactive element displaces a less reactive metal from its compound
• what is an electrolyte?

  a liquid or solution that can conduct electricity because ions are free to move.