Chem- chapter eight

• What is chlorine used for in water treatment?

  Water purification
• What color does chlorine produce in a solution?

  Pale green
• How do halogens behave in reactions with other halides?

  More reactive halogens displace less reactive ones
• What trend is observed in halogens as you move down the group?

  Reactivity decreases due to increasing number of electrons
• What type of agents are halogens considered in redox reactions?

  Oxidizing agents
• What is the ionic equation for the reaction of chlorine with bromine?

  $Cl_2 +$$2Br^- \rightarrow 2Cl^- +$$Br_2$
• What is the test for ammonium ions?

  Heat with sodium hydroxide and test with litmus paper
• What happens when ammonium ions are heated with sodium hydroxide?

  They produce ammonia gas, which turns litmus paper blue
• How can you test for carbonate ions in a solution?

  Add dilute acid and observe for bubbling due to carbon dioxide
• What is the general formula for metal oxides formed by Group 2 elements?


  MO, where M is the metal
• What do Group 2 metals form when they react with water?

  Alkaline hydroxides
• What is the use of Group 2 hydroxides in medicine?

  To raise the pH of stomach acid to treat indigestion
• Which Group 2 hydroxides are commonly used for treating indigestion?

  Calcium hydroxide and magnesium hydroxide