Q7 of 38 Page 3

Define the atomic mass unit.

One atomic mass unit is a mass unit equal to exactly one twelveth (1/12th) the mass of one atom of carbon-12. The relative atomic masses of all elements have been found with respect to an atom of carbon-12.

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5

Give the symbols of the following elements.

(i) Aluminium (ii) Cobalt


(iii) Arsenic (iv) Radon

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Why are Dalton’s symbols not used in chemistry?

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Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?

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In a reaction, 5.3 g of sodium carbonate reacted with 6 g ethanoic acid. The products were 2.2 g of carbon dioxide, o.9 g of water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass.