Chemistry for the gifted and talented: oxidation numbers

No comments

This activity introduces oxidation numbers by giving a conceptual foundation for them in terms of electron accounting and polar bonds. It then shows how the model used so far needs refining.

Downloads

Oxidation numbers
Handout | PDF, Size 0.27 mb

No comments

Level

16-18 years

Use

Specification

England
- A/AS level
Scotland
- Higher
  - SQA Chemistry
    - 1. Chemical changes and structure
      - (a) Periodicity
        Atoms of different elements have different attractions for bonding electrons. Electronegativity is a measure of the attraction an atom involved in a bond has for the electrons of the bond.
      - (b) Structure and bonding
        (i) Types of chemical bond
        Polar covalent bonds are formed when the attraction of the atoms for the pair of bonding electrons is different. Delta positive (δ+) and delta negative (δ-) notation can be used to indicate the partial charges on atoms, which give rise to a dipole.
Wales
- A/AS level
  - WJEC Chemistry
    - Unit 1: THE LANGUAGE OF CHEMISTRY, STRUCTURE OF MATTER AND SIMPLE REACTIONS
      - 1.1 Formulae and equations
        (b) oxidation numbers of atoms in a compound or ion
      - 1.4 Bonding
        (d) concepts of electronegativity and bond polarity
    - Unit 3: PHYSICAL AND INORGANIC CHEMISTRY
      - 3.2 Redox reactions
        (a) how to construct ion/electron half-equations, for example, for the reduction of acidified Cr₂O₇²⁻ to Cr³⁺ and acidified MnO⁴⁻ to Mn²⁺ and the oxidation of S₂O₃²⁻ to S₄O₆²⁻
        (c) redox reaction between Cu²⁺ and I⁻ and the determination of the liberated iodine with S₂O₃²⁻
Northern Ireland
- A/AS level
  - CCEA Chemistry
    - Unit AS 1: Basic Concepts in Physical and Inorganic Chemistry
      - 1.3 Bonding
        1.3.8 define the term electronegativity and explain the trend in the electronegativity of elements down Groups and across Periods;
        1.3.9 explain that bond polarity arises when covalently bonded atoms have different electronegativities and use partial charges to show that a bond is polar;
      - 1.7 Redox
        1.7.1 calculate the oxidation state for an element in a compound or ion, including peroxides and metal hydrides;
Republic of Ireland
- Leaving Certificate
  - Chemistry
    - 2. Chemical bonding
      - 2.3 Covalent Bonding
        Depth of treatment
        Molecules. Minute size of molecules.
      - 2.4 Electronegativity
        Depth of treatment
        Electronegativity. Periodic variation of electronegativity - explanation for general trends in values: (i) down a group

Resource
Chemistry for the gifted and talented book introduction

Chemistry for the gifted and talented is a refreshingly challenging educational book containing a wide range of differentiated activities for use in school and college.
Misconceptions
Ionic bonding: true or false? | Chemical misconceptions II

By Keith S Taber

Check your learners’ understanding of ionic bonding with this true or false worksheet
Extension
Ionic bonding and electron transfer | Stretch and challenge | 14–16 years

By Tim Jolliff

Learners evaluate and discuss ideas about ionic bonding, the formation of ions and energetics

No comments yet

You're not signed in.

Only registered users can comment on this article.

More Resources

Resource
Decision tree: acid, base or buffer? | 16–18 years

By Catherine Smith

Help learners understand which equation they need to answer questions about acids, bases and buffers by scaffolding their thinking
Resource
The structure of benzene | 16–18 years

Use this worksheet with classroom slides and card sort activity to explore the structure of benzene with your learners
Resource
Particle model | Key terms support | 11–14

By Laura Conkerton and Rachel Burton

Language support pack for particle model, with key terms list, accessible glossary, Frayer models and unscrambling definitions

Chemistry for the gifted and talented: oxidation numbers

Downloads

Oxidation numbers

Level

Use

Category

Specification

Related articles

Chemistry for the gifted and talented book introduction

Ionic bonding: true or false? | Chemical misconceptions II

Ionic bonding and electron transfer | Stretch and challenge | 14–16 years

No comments yet

Only registered users can comment on this article.

More Resources

Decision tree: acid, base or buffer? | 16–18 years

The structure of benzene | 16–18 years

Particle model | Key terms support | 11–14