AS Level Chemistry - 2.3 Formulas

This powerpoint fully covers the following criteria –

2.3 Formulas

Learning outcomes
Candidates should be able to:

1 write formulas of ionic compounds from ionic charges and oxidation numbers (shown by a Roman numeral), including:
(a) the prediction of ionic charge from the position of an element in the Periodic Table
(b) recall of the names and formulas for the following ions: NO3 – , CO3 2–, SO4
2–, OH– , NH4 +, Zn2+, Ag+,HCO3 –, PO4 3–

2 (a) write and construct equations (which should be balanced), including ionic equations (which should not include spectator ions)
(b) use appropriate state symbols in equations

3 define and use the terms empirical and molecular formula

4 understand and use the terms anhydrous, hydrated and water of crystallisation

5 calculate empirical and molecular formulas, using given data

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