Hydrocarbons Introduction

IGCSE Edexcel Chemistry
4.1-4.3 Hydrocarbons and key terms
Key Concept: Hydrocarbons contain only hydrogen and carbon. Homologous series share a general formula and functional group.

Section A: Definitions

1. Define a hydrocarbon. [1]
2. Define the term homologous series. [2]
3. What is a functional group? [1]

Section B: Isomerism

4. Define isomerism. [2]
5. How many carbon atoms are present in the formula C4H10? [1]

Total marks: 7

Mark Scheme

1. Compound containing only hydrogen and carbon [1]
2. A family of compounds with same functional group and general formula; similar chemical properties [2]
3. Atom or group of atoms responsible for reactions/properties [1]
4. Same molecular formula but different structural formulae [2]
5. 4 [1]