colour changes

• alkenes and bromine water

  orange goes to colourless
• alkanes and bromine water

  orange and remains orange
• chlorine with damp litmus paper

  blue goes to red and then white/bleached
• hydrogen chloride -dry with blue litmus

  remains blue
• hydrogen chloride with damp blue litmus/ hydrogen chloride in water with blue litmus

  blue goes to red
• hydrogen chloride in methylbenzene with dry litmus

  remains blue
• test for the presence of water-anhydrous copper sulphate

  white goes to blue
• reaction of copper with rated nitric acid

  goes to blue solution and brown fumes
• heating copper carbonate


  green solid goes to black solid
• zinc or magnesium in copper sulphate solution

  grey metal in blue solution goes to colourless solution and black solid
• magnesium burning forming magnesium oxide

  silvery shiny solid goes to white solid
• hydrochloric acid and ammonia neutralisation


  two colourless gases goes to white solid
• chlorine water and sodium bromide solution


  two colourless solutions goes to yellow solution
• chlorine water and sodium iodine solution


  two colourless solutions goes to brown solution
• bromine water and sodium iodide solution

  two colourless solutions goes to brown solution
• heating hydrated copper sulphate

  blue solid goes to white solid