halogen reactions

• What can more reactive substances do in displacement reactions?

  Displace less reactive substances from compounds
• What happens when chlorine displaces bromine in a compound?

  Sodium bromide becomes sodium chloride and bromine
• Write the balanced equation for the displacement reaction of sodium bromide and chlorine.

  2NaBr + Cl2 → 2NaCl + Br2
• What happens to bromide ions in a displacement reaction?

  They are oxidised and lose electrons
• What is the oxidation reaction for bromide ions?

  2Br- → Br2 + 2e-
• What happens to chlorine in a displacement reaction?

  Chlorine is reduced and gains electrons
• What is the reduction reaction for chlorine?

  Cl2 + 2e- → 2Cl-
• What are spectator ions in a chemical reaction?

  Ions that do not change during the reaction
• What do halogens react with to form hydrogen halides?

  Hydrogen
• What type of compounds are hydrogen halides?

  Covalent compounds
• Write the balanced equation for the reaction of hydrogen and chlorine.

  H2(g) + Cl2(g) → 2HCl(g)
• What happens when hydrogen halides dissolve in water?

  They form acidic solutions
• What is produced when hydrogen chloride dissolves in water?

  Hydrochloric acid
• What ions do hydrogen halides produce in solution?

  H+ ions
• Why do hydrogen halides make solutions acidic?

  They produce H+ ions in solution