Same chapter2 marksDifficulty: Easy
Write the symbols of iron, sodium, potassium, silver and lead, and say why they differ from the English names.
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2 marksDifficulty: Easy
What is a chemical formula? State what the formula H2SO4 tells you.
Original Khojo Papers practice question — not from a past board paper.
Answer
A chemical formula is the representation of a molecule of a substance by the symbols of the elements it contains and the number of atoms of each. H2SO4 tells us that one molecule of sulphuric acid contains two atoms of hydrogen, one of sulphur and four of oxygen.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The formula also gives the relative molecular mass once the atomic masses are known.
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