10 minutes maximum

An IB Periodic Table is required.

1. Which is the best description of a metallic bond?

The electrostatic attraction between...

  • A.   positive and negative ions
  • B.   shared pairs of electrons and the positively charged nucleus
  • C.   positive ions and delocalized electrons.
  • D.   atoms and delocalized electrons
2. Which statement is true?
  • A.   Sodium has a stronger metallic bond than lithium
  • B.   Potassium has a weaker metallic bond than calcium
  • C.   The melting point of the alkali metals increases down the group
  • D.   The melting point of the metals Na, Mg, Al decreases with atomic number
3. Which substance has a high melting point and conducts in the solid state?
  • A.   potassium
  • B.   diamond
  • C.   silicon dioxide
  • D.   copper
4. Which has the higher melting point, sodium or aluminium and why?
  • A.   Aluminium because the aluminium ion has a greater charge
  • B.   Aluminium because aluminium has a greater ionization energy
  • C.   Sodium because sodium has a smaller electronegativity
  • D.   Sodium because sodium has a larger atomic radius
5. Which statement explains why metals conduct electricity?
  • A.   Metals have delocalized electrons which are free to move
  • B.   Metals have layers of positive ions which can slide over each other
  • C.   Metals have lower ionization energies than non-metals in the same period
  • D.   Metals contain ions which are free to move
6. Steel is an alloy of iron and carbon. Which is true for steel?
  • A.   Iron and carbon are chemically bonded
  • B.   Steel is stronger than iron
  • C.   Steel is more malleable than iron
  • D.   Steel does not conduct electricity

7. Which diagram best represents a solid alloy?

alloy structure x 4 diagrams

8. Sodium, graphite and sodium chloride can all conduct electricity. What particles conduct the current through the substance in each case?

  sodium graphite Sodium chloride
A ions electrons ions
B ions ions electrons
C electrons electrons electrons
D electrons electrons ions
9. A substance has a melting point of 1746°C. It does not conduct electricity when molten and is insoluble in water. What type of structure does the solid have?
  • A.   simple molecular
  • B.   ionic
  • C.   giant molecular
  • D.   metallic
10. Which statement correctly describes the trend in melting point of the elements across period 3 from Na to Cl?
  • A.  increases
  • B.  decreases
  • C.  decreases then increases
  • D.  increases then decreases