Chem quiz 2

• Write a balanced symbol equation for hydrogen and chlorine reacting together

  Cl^2(g) + H^2(g) ➡️ 2HCl(g)
• What was Mendeleev's contribution to the development of the periodic table?

  He left gaps for undiscovered elements and placed elements with similar chemical properties in groups together (even if this meant it didn't follow atomic weight order)
• Name the properties of metal

  Good conductors of electricity and heat, shiny, malleable, ductile and high density
• Name the properties of non-metals

  Poor conductors of electricity and heat, dull, brittle and low density
• What are the specific properties of transition metals

  Catalysts, form coloured compounds and can form more than 1 positive ion
• When does ionic bonding occur?

  Between a metal and a non metal
• Describe the structure of graphite

  Every carbon atom bonds to 3 other carbon atoms to form layers. The layers are held together by weak intermolecular forces. Each carbon loses one electron and it becomes delocalised
• Why doesn't diamond conduct electricity?

  It doesn't have any delocalised electrons because all outer electrons are involved in covalent bonds
• Why do metals have high melting/boiling points?

  It takes a large amount of heat energy to break to strong electrostatic attraction between the positive metal ions and negative delocalised electrons
• What are cylindrical fullerenes called

  Carbon nanotubes
• Name useful properties of fullerenes

  High tensile strength, good conductors of heat and electricity
• What was the first fullerene?

  Buckminster fullerene C^60