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Explain with examples what is meant by a 'mole' of a substance.

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What is meant by Unified Atomic Mass

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Explain the need for a reference atom for atomic mass. Give some information about two reference atoms.

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M is a bivalent metal. Write down the steps to find the chemical formulae of its compounds formed with the radicals,

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Explain how the element sodium is monovalent.

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Write the steps in deducing the chemical formulae of the following compounds. (v) Aluminium hydroxide

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Write the steps in deducing the chemical formulae of the following compounds. (iv) Calcium oxide

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Write the steps in deducing the chemical formulae of the following compounds. (iii) Ferric phosphate

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Write the steps in deducing the chemical formulae of the following compounds. (ii) Potassium nitrate,

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Write the steps in deducing the chemical formulae of the following compounds. Sodium sulphate

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Write symbols of the following elements and the radicals obtained from them and indicate the charge on the radicals.

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Give example Trivalent basic radicals

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give example Bivalent acidic radicals

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Give example Metals with variable valency

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Give example Composite radicals

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Give examples Basic radicals

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Give examples. Positive ions

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Why are fuse wires used?

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Explain Ohm’s law with the formula.

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What are free electrons?

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