6.2.3 Displacement Reactions

• What are displacement reactions?

  Reactions where a more reactive halogen replaces a less reactive halogen
• Why do halogens react in similar ways?

  They belong to the same family of elements
• What are the elements in Group 1 of the periodic table?

  • Lithium (Li)
  • Sodium (Na)
  • Potassium (K)
  • Rubidium (Rb)
  • Caesium (Cs)
  • Francium (Fr)
• What occurs in a displacement reaction involving halogens?

  A more reactive halogen replaces a less reactive one
• What are the common properties of the halogens in Group 7?

  • Highly reactive nonmetals
  • Exist as diatomic molecules
  • Form negative ions by gaining one electron
  • Increase in atomic size and reactivity down the group
• What is the name of the group containing the alkali metals?

  Group 1
• What are the common properties of the alkali metals in Group 1?

  • Highly reactive
  • Soft and silvery-white
  • Low melting and boiling points
  • Readily lose their valence electron to form positive ions
• What are the elements in Group 7 of the periodic table?

  • Fluorine (F)
  • Chlorine (Cl)
  • Bromine (Br)
  • Iodine (I)
  • Astatine (At)
• What is the name of the group containing the alkali earth metals?

  Group 2
• Why do the halogens in Group 7 increase in reactivity down the group?

  Their atomic size increases, making it easier to gain an electron
• Why do halogens at the top of Group 7 show more reactivity?

  They undergo displacement reactions more readily
• Which halogen is more reactive, chlorine or bromine?

  Chlorine (Cl₂) is more reactive
• What are the halogens listed from most to least reactive?

  • Fluorine (F)
  • Chlorine (Cl)
  • Bromine (Br)
  • Iodine (I)
  • Astatine (At)
• What is the order of reactivity among halogens from most to least reactive?

  • Fluorine (F₂)
  • Chlorine (Cl₂)
  • Bromine (Br₂)
  • Iodine (I₂)
• What ions does chlorine take from sodium bromide during the reaction?

  Chlorine takes bromide ions (Br⁻)
• Why do displacement reactions occur between halogens?

  Due to differences in their reactivity
• What is a displacement reaction?

  A reaction where one element replaces another
• What happens when chlorine reacts with sodium bromide?

  Chlorine displaces bromine from sodium bromide
• What is produced alongside sodium chloride when chlorine displaces bromine?

  Free bromine (Br₂)
• Which halogen is less reactive, bromine or iodine?

  Iodine (I₂) is less reactive
• What is the chemical equation for chlorine displacing bromine from sodium bromide?

  Cl₂ + 2NaBr → 2NaCl + Br₂
• How is chlorine produced in industrial production using halogen displacement reactions?

  By displacing bromine from sodium bromide
• What do these displacement reactions demonstrate about halogens?

  A more reactive halogen displaces a less reactive one
• Why does bromine displace iodine in sodium iodide?

  Bromine is more reactive than iodine
• Why does chlorine displace iodine in potassium iodide?

  Chlorine is more reactive than iodine
• What are halogen displacement reactions?


  Reactions where one halogen displaces another
• What are the applications of halogen displacement reactions?

  • Water purification
  • Industrial production
  • Chemical manufacturing
• What are the vital roles of halogen displacement reactions?

  • Maintaining water quality
  • Creating valuable chemicals
  • Supporting various industrial processes
• Why are the alkali metals in Group 1 highly reactive?

  They readily lose their valence electron to form positive ions
• Why are halogen displacement reactions important in chemical manufacturing?

  They facilitate the synthesis of halogen-containing compounds
• How do strong halogens like chlorine purify water?

  By reacting with and removing harmful bacteria
• What is the trend of reactivity in halogens as you move down Group 7?

  Reactivity decreases down Group 7
• How does the reactivity of halogens affect displacement reactions?

  More reactive halogens replace less reactive ones
• What is the name of the group containing the halogens?

  Group 7