Skip to content

Crunch Chemistry

The ultimate A level chemistry resource

  • Fundamentals
    • Maths skills for chemists
    • Calculations for AS and A level Chemistry
    • Working with gases
    • Atoms and ions
    • Bonding and Structure
    • Environmental chemistry
  • Inorganic chemistry
    • Redox reactions
    • Explaining the chemistry of Group 2 metals
    • Explaining the chemistry of the Group 7, the halogens
    • Bonding in the nitrogen oxides and oxyanions
    • Trends in Period 3
    • Transition metal chemistry
  • Organic chemistry
    • How do organic reactions actually happen?
    • Stabilising carbocations through inductive and mesomeric effects
    • Alkanes and Crude Oil
    • Alkenes
    • Halogenoalkanes
    • Alcohols
    • Carbonyl compounds
    • Organic nitrogen compounds
    • Benzene and other aromatic molecules
  • Physical chemistry
    • Acids, bases, buffers and pH
    • Chemical equilibria
    • Electrochemistry
    • Enthalpy changes
    • Entropy
    • Reaction kinetics
    • Solubility
  • Analytical chemistry
    • How does electromagnetic radiation affect molecules?
    • Atomic absorption and emission spectroscopy
    • Mass spectrometry
    • Infrared spectroscopy
    • Nuclear magnetic resonance spectroscopy
    • Mixed spectra long answer exam question practice
    • Everything you need to know about chromatography
    • Qualitative analysis
  • Newsletters …
  • 1:1 chemistry tuition …

Author: Sarah Parkes

Cat Links Physical chemistry

What is le Chatelier’s Principle?

Posted on August 3, 2022February 10, 2025 Sarah Parkes

When we have a chemical reaction that has reached a state of dynamic equilibrium, there will be one particular set

Continue readingWhat is le Chatelier’s Principle?

Cat Links Physical chemistry

What is position of equilibrium?

Posted on August 2, 2022October 2, 2024 Sarah Parkes

I’m sure you will all have seen a strip of magnesium burning in a Bunsen burner flame. It is a

Continue readingWhat is position of equilibrium?

Cat Links Organic chemistry

Elimination reactions – dehydrating an alcohol

Posted on August 1, 2022April 3, 2025 Sarah Parkes

If we dehydrate an alcohol, we are essentially removing a water molecule and the product will be an alkene. The

Continue readingElimination reactions – dehydrating an alcohol

Cat Links Organic chemistry

Electrophilic addition in alkenes (3) – reaction with water to form an alcohol

Posted on August 1, 2022October 2, 2024 Sarah Parkes

The reaction of an alkene with water to from an alcohol is an example of a hydration reaction. The alkene

Continue readingElectrophilic addition in alkenes (3) – reaction with water to form an alcohol

Cat Links Organic chemistry

Electrophilic addition in alkenes (2) – the bromine water test

Posted on August 1, 2022February 19, 2025 Sarah Parkes

The classic test for an alkene is to shake your sample with orange bromine water, and if the molecule contains

Continue readingElectrophilic addition in alkenes (2) – the bromine water test

Cat Links Organic chemistry

Making addition polymers by radical polymerisation

Posted on August 1, 2022October 2, 2024 Sarah Parkes

The mechanism for addition polymerisation is another example of a radical reaction. Teflon (PTFE), famously known for its non-stick properties,

Continue readingMaking addition polymers by radical polymerisation

Cat Links Organic chemistry

Addition polymers and their properties

Posted on August 1, 2022March 5, 2025 Sarah Parkes

Polymers are long chain molecules made via addition polymerisation or condensation polymerisation – the result are all the plastics, fibres

Continue readingAddition polymers and their properties

Cat Links Organic chemistry

Electrophilic addition reactions in alkenes (1)

Posted on July 19, 2022January 8, 2025 Sarah Parkes

Now that you have been introduced to the terminology and fundamental ideas of reaction mechanisms, it is time to focus

Continue readingElectrophilic addition reactions in alkenes (1)

Cat Links Organic chemistry

Stabilising carbocations through inductive and mesomeric effects

Posted on July 14, 2022October 2, 2024 Sarah Parkes

Inductive and mesomeric effects both play an important role in determining how organic reactions happen through their abilities to stabilise

Continue readingStabilising carbocations through inductive and mesomeric effects

Cat Links Organic chemistry

How do organic reactions actually happen?

Posted on July 14, 2022January 6, 2025 Sarah Parkes

Most reactions take place via two or three steps with short-lived, unstable, intermediate ions bridging the steps from reactants to

Continue readingHow do organic reactions actually happen?

Posts navigation

Older posts
Newer posts

Recent Posts

  • The chemistry of amines
  • Don’t know what your calculations mean? You’re not alone!
  • Mixed spectra long answer exam question practice
  • Understanding the structure of benzene
  • What is a homogeneous catalyst?

Recent Comments

No comments to show.
  • Contact me!
  • About me ….
Copyright © 2025 Crunch Chemistry | Signify Education by WEN Themes
Scroll Up