PDF chapter test TRY NOW
Briefly answer the following questions:
1. You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
On the powder, it will char if it is . Alternatively, the powder may be dissolved in water and checked for its conduction of electricity. If it conducts, it is a .
2. Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24 g mol-1.
Mass of magnesium ribbon (Mg), w = .
Molar mass of Mg (M) = .
Number of moles (n) = w / M = 12 g / 24 g = .
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