2012 SPM Chemistry (Paper1) Answer

1.B 2.A 3.A 4.A 5.C 6.D 7.C 8.D 9.A 10.D
11.B 12.A 13.D 14.D 15.A 16.C 17.B 18.A 19.A 20.B
21.C 22.C 23.B 24.A 25.C 26.C 27.D 28.D 29.D 30.B
31.B 32.B 33.B 34.D 35.B 36.C 37.C 38.A 39.C 40.C
41.A 42.A 43.B 44.D 45.D 46.D 47.C 48.A 49.A 50.D


Common Sources of Radiation Used in Malaysia

Medical Field

Widely used in Nuclear Medicine, radiology & Radiotherapy, for diagnosis purposes & medical research. 
Common radioisotopes used : Technitium-99, Cobalt-60, Cesium-137, Iodine & Radium 226

In Industry

Used in industrial application such as gauging, oil logging, industrial radiography, analyytical purposes for minerals & soil samples, quality assuarance for electronic componenets & tracer 
technique applications. 
Common radioisotopes used : Americium-241, Berryllium-9, Cobalt-60, Cesium-137, Stronitium-90, Iridium-192, Argon-41, Kripton-85, Sodium-24.

In Research

Mostly for research activities in agriculture, medicine & nuclear sciences. 
Common radioisotopes used : Phosphorus-32, Technitium-99, Cobalt-60, Cesium-137, Gold-198.

Source : Atomic energy Licensing Board, Malaysia


Crystallization of Lead(II) Iodide

  1. What is the special characteristics of lead(II) iodide you observe from the video above?
  2. What are the reactants used to prepare lead(II) iodide?

Naming of Carbon Compounds

Wordle: Carbon Compounds

Are you able to identify names of 10 different carbon compounds?
It's a trial version using Wordle.