Sherpa

Existing user?

Chemistry

GCSE · Edexcel

QuestionsFlashcards

Group 1
- Group 1 (Alkali Metals)
  6
- Group 1: Reactivity & Electronic Configurations
  6
Group 7
Group 0

Qualitative Analysis: Tests for Ions
Hydrocarbons
Polymers
Alcohols & Carboxylic Acids
Bulk & Surface Properties of Matter Including Nanoparticles
- Nanoparticles
  7
- Ceramics, Polymers, Composites & Metals
  5

Homologous Series Flashcards

All 6 cards in this deck

What are the four features of a homologous series?: Same general formula; neighbouring members differ by $\mathrm{CH_2}$ ; gradual variation in physical properties (e.g. boiling point); similar chemical properties.
Which homologous series are the hydrocarbons in crude oil fractions mostly members of, and what is its general formula?: Alkanes, general formula $\mathrm{C_nH_{2n+2}}$ .
e.g. $n = 4$ gives $\mathrm{C_4H_{10}}$ .
As the number of carbon atoms in a hydrocarbon molecule increases, what happens to its boiling point?: It increases.
As hydrocarbon molecules get longer, what happens to their viscosity?: Viscosity increases — they become thicker and flow less easily.
As hydrocarbon molecules get longer, what happens to their ease of ignition?: They become harder to ignite (less flammable) and burn with a smokier, sootier flame.
True or false? Members of the same homologous series have similar chemical properties.: True. They react in similar ways, although their physical properties vary gradually.