Target: 10 Questions in 10 minutes

An IB Chemistry data booklet is helpful
1. Steel is an alloy of iron and carbon. Which is true for steel?
  • A.   Steel is a heterogeneous mixture
  • B.   Steel is stronger than iron
  • C.   Steel is more malleable than iron
  • D.   Steel does not conduct electricity
2. Which diagram best represents a solid alloy?

alloy structure x 4 diagrams
3. Which of the following substances is the least malleable?
  • A.   Brass
  • B.   Copper
  • C.   Zinc
  • D.   Iron
4. On a bonding triangle, which of the following substances has the most covalent character?
  • A.   Lithium iodide
  • B.   Sodium sulphide 
  • C.   Aluminium bromide
  • D.   Phosphorus pentafluoride
5. On a van Arkel–Ketelaar bonding triangle, which combination of electronegativity data gives the most covalent character for a binary compound?
  • A.   Two elements with a high absolute difference in electronegativities and a high average electronegativity
  • B.   Two elements with a high absolute difference in electronegativities and a low average electronegativity
  • C.   Two elements with a low absolute difference in electronegativities and a high average electronegativity
  • D.   Two elements with a low absolute difference in electronegativities and a low average electronegativity

6. Which of the following is the repeating unit for polychloroethene?

4 x structure of polychloroethene
7. Which of the following is the correct structure for poly(but-1-ene)?

4 x structure of poly(but-1-ene)

8. Which of the diagrams below is the monomer for the polymer shown to the right?

 structure of polymer

4 x structure of monomer
9. The mechanical properties of a plastic depend on the degree of its branching. More branching leads to a plastic..
  • A.   being more amorphous and having higher tensile strength
  • B.   being more crystalline and having higher tensile strength
  • C.   being more amorphous and having lower tensile strength
  • D.   being more crystalline and having lower tensile strength

10. Which of the following statements is correct about the two different types of plastics, thermoplastic and thermosets?

I. Thermoplastic polymers can be recycled
II. Thermosets have strong cross-links between polymer chains
III. Thermosets can be heated and remoulded.
 
  • A. I and II only
  • B. I and III only
  • C. II and III only
  • D. I, II and III