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6. Lines on an absorbtion spectra are produced when electrons drop down from excited energy levels

  • False
  • True

7. What is the bond angle in a molecule with a tetrahedral shape?

  • 109 degrees
  • 120 degrees
  • 180 degrees

8. What is the bond angle in a molecule with a triangular planar shape?

  • 180 degrees
  • 120 degrees
  • 109 degrees

9. The half-life of carbon-14 is 5730 years. How long will it take for the sample's count rate to decrease from 160 counts per minute to 40 counts per minute?

  • 17190 years
  • 11460 years
  • 5730 years

10. In group 2 elements, melting point increases down the group

  • False
  • True

11. In the ionisation area of a mass spectrometer, the sample is 'bombarded' with electrons so that...

  • cations are formed
  • all of the molecules have the same kinetic energy
  • anions are formed

12. What is an isotope?

  • atom with different number of protons, different number of neutrons
  • atom with same number of protons, different number of neutrons
  • atom with same number of protons, same number of neutrons
  • atom with different number of protons, same number of neutrons

13. In group 2 elements, thermal stability increases down the group

  • True
  • False