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Combined Science: Chemistry

GCSE · Edexcel · foundation

QuestionsFlashcards

Obtaining & Using Metals
Reversible Reactions & Equilibria
- Reversible Reactions & Equilibrium
  3
- The Haber Process
  4

Group 1
- Group 1 (Alkali Metals)
  4
- Group 1: Reactivity & Electronic Configurations
  4
Group 7
Group 0

Empirical Formulae Flashcards

All 4 cards in this deck

What is an empirical formula?: The formula showing the simplest whole-number ratio of atoms of each element in a compound.
What is the empirical formula of butene, $\mathrm{C_4H_8}$ ?: $\mathrm{CH_2}$ — divide both numbers by 4 to get the simplest ratio.
How is the molecular formula related to the empirical formula and the relative molecular mass?: Multiply every number in the empirical formula by (relative molecular mass ÷ mass of the empirical formula unit).
True or false? For some compounds the empirical formula and the molecular formula are the same.: True. If the formula is already the simplest ratio they are the same, e.g. $\mathrm{H_2O}$ and $\mathrm{CO_2}$ .