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Edexcel A-Level Chemistry AS 1.1 The Terms Atom Element Ion Molecule Compound Empirical Formula and Molecular Formula Questions

Use bonding and particle type to classify substances, count each atom from a representation, reduce ratios to empirical formulae and balance ionic charges as required.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Distinguish atoms, ions, molecules, compounds and giant structures from formulae.
  • Determine molecular or empirical formulae by counting atoms and balancing ionic charges.

Edexcel A-Level Chemistry AS 1.1 The Terms Atom Element Ion Molecule Compound Empirical Formula and Molecular Formula Questions question 1

[Maximum number: 2]

Terpenes and terpenoids are groups of chemicals found in plants.
They contribute to the smell and taste of the plant, and so are used in flavourings and perfumes.

Both terpenes and terpenoids have carbon skeletons based on one or more units of the compound isoprene.

Figure for Question Edexcel A-Level Chemistry AS 1.1 The Terms Atom Element Ion Molecule Compound Empirical Formula and Molecular Formula Questions question 1 — Edexcel A-Level Chemistry AS

isoprene
Terpenes are made up of two or more isoprene units joined together, while terpenoids have additional functional groups, often containing oxygen.

Limonene and myrcene are both terpenes composed of two isoprene units.
Menthol, linalool and citronellol are terpenoids containing an - OH group.

Show that myrcene and limonene are terpenes by comparing the molecular and/or empirical formulae of myrcene, limonene and isoprene.

myrcene

myrcene

limonene

limonene

isoprene

isoprene

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