Group 7

• Are group 7 element s metals or non-metals


  Non-Metals
• What is the name for the group 7 elements

  Halogens
• How do the group 7 elements exist

  Diatomic molecules
• What is the colour of fluorine in its gaseous state

  Pale Yellow
• What is the colour of Chlorine in its gaseous state


  Greenish
• What is the colour of Bromine in its gaseous state


  Red-Brown
• What is the colour of Iodine in its gaseous state

  Purple
• What is the state of F2 at room temperature

  Gas
• What is the state of Cl2 at room temperature

  Gas
• What is the state of Br2 at room temperature

  Liquid
• What is the state of I2 at room temperature

  Solid
• Why are a number of fluorines properties untypical

  The F-F bond is unexpectedly weak
• What is the trend in electronegativity going down the grou

  Decreases
• What is the trend in atomic radius going down the group

  Increases
• What is the trend in melting point going down the group

  Increasing
• What is the trend in boiling point going down the group

  Increasing
• What is the electronegativity of Flourine

  4
• What is the electronegativity of Chlorine

  3
• Explain the trend in melting and boiling point going down group 7

  The trend of increasing melting and boiling point going down the group is due to there being larger atoms therefore having more electrons and making the van der Waals forces a lot higher
• What is the charge of the negative ions which halogens nromaly react with

  -1
• What is the trend in oxidising ability of halogens going up the group

  Increasing
• What is the most powerful oxidising agenty

  Flourine
• Define displacment reaction

  A reaciton in which one compound displaces another due to a higher reactivity
• Write an equation for the displacment of bromine ions by Cl

  Cl2(aq) +2NaBr(aq) -> Br2(aq) +2NaCl(aq)
• Draw an ionic equation for the displacement of brodie ions by chlorine

  Cl2(aq) + 2Br-(aq) -> Br2(aq) + 2Cl-(aq)
• What is a use for the displacment of bromide ions by chlorine

  It is used to extract bromine from sea water
• How was iodine first extracted

  From burning Kelp
• What is the trend of reducing power going down the group

  Increases
• What is the reaction between Sodium chloride and sulfuric acid

  NaCl(s) +H2SO4(l) -> NaHSO4(s) + HCl(g)
• What is visible when sodium chloride reacts with sulfuric acid

  Steamy fumes of hydrogen chloride
• Is the reaciton of hydrogen chloride and sulfuric acid redox

  No as there are no changes in oxidation state
• What is the name for the type of reaction that occurs between NaCl and H2SO4

  Acid-base reaction
• What are the problems of reaction Sodium Flouride with Sodium Chloride

  The fumes it produces are extremely dangerous that will etch glass
• What is visible when you react sodium bromide and sulfuric acid

  brown fumes of bromine
• What is the first reaction that can occur when sodium bromine reacts with sulfuric acid

  NaBr(s) + H2SO4(l) -> NaHSO4(s) + HBr(g)
• What is the reaction bromine ions reduce sulfuric acid to sulfur dioxide

  2H+ + 2Br- + H2SO4(l) -> SO2(g) + 2H2O(l) +Br2(l)
• What is the reaction when Sodium bromide reacts with Sulfuric acid

  2NaBr + 3H2SO4 -> 2NaHSO4 + SO2 + 2H2O + Br2
• How can you identify that sodium iodie reacted with sulfuric acid

  Steamy fumes of hydrogen iodide, black solid of iodine, bad egg smell from hydrogen sulfide
• What is the equation for the acid-base reaction between hydrogen ioidide and sulfuric acid

  NaI(s) + H2SO4(l) -> NaHSO4(s) + HI(g)
• How can you identify metal halides

  Using silver ions|