Do you know how to determine a compound’s empirical formula?
Molecular and Empirical Formulae
All calculations in this quiz are relevant to Edexcel Combined Science and Edexcel Chemistry.
AQA Trilogy and Chemistry students only need to know what empirical formulae are and do not need to complete this whole quiz.
OCR (all courses) and AQA Synergy students need to be able to determine an empirical formula from the number of atoms in a compound but do not need to understand the other calculations in this quiz. E.g. determining molecular formulae from empirical formulae and relative atomic mass.
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Drag and drop to match the description to the correct term
- Molecular formula
- Empirical formula
- The actual number of atoms of each element in a molecule
- The simplest integer ratio of atoms or ions of each element in a compound
What is meant by the term empirical formula mass?CorrectIncorrect
Determine the empirical formula of glucose – C₆H₁₂O₆.CorrectIncorrect
Determine the empirical formula for Cyclopentane – C₅H₁₀?CorrectIncorrect
Determine the empirical formula for Cyanuric triazide – C₃N₁₂.CorrectIncorrect
Determine the molecular formula of glucose which has an empirical formula of CH₂O. The Mᵣ for glucose is 180. Carbon Aᵣ – 12, Hydrogen Aᵣ – 1, Oxygen Aᵣ – 16.CorrectIncorrect
Determine the molecular formula of hydrogen peroxide which has an empirical formula of HO. The Mᵣ for hydrogen peroxide is 34. Hydrogen Aᵣ – 1, Oxygen Aᵣ – 16.CorrectIncorrect
Calculate the empirical formula of a compound which contains 5.31g of chlorine (Aᵣ – 35.453) and 8.40g of oxygen (Aᵣ – 15.999).CorrectIncorrect
Calculate the empirical formula of a compound that contains 69.94g of Fe (Aᵣ – 55.85) and 30.06g of O (Aᵣ – 12.00).CorrectIncorrect