Ionic equations: reactions of Group 1 and Group 7
Lesson details
Learning outcome
I can write balanced ionic equations and half equations for the reactions of Group 1 and 7 elements.
Key learning points
- Reduction is the gain of electrons, and oxidation is the loss of electrons.
- Displacement reactions are often examples of redox reactions.
- Half equations show which elements are oxidised, and which are reduced.
Keywords
Oxidation - A type of reaction in which a substance gains oxygen or loses electrons.
Half equation - A chemical equation used to show the electrons lost in oxidation or the electrons gained in reduction.
Reduction - A type of reaction in which a substance loses oxygen or gains electrons.
Redox - A redox reaction is one in which a substance is oxidised and another is reduced.
Ionic equation - A chemical equation in which reacting ions are shown; unreacting ions (spectator ions) are not included.
Common misconception
Pupils can confuse oxidation and reduction when involving electrons. They often mistake a positive charge on an ion as meaning electrons have been added and vice versa for negative ions.
It is very important to teach from first principles what causes the charges and then work up to half equations where the pupils can see the electrons in the equations, finally combining these to form ionic equations.
Teacher tip
Pupils need much practise so many half equation examples of species being both oxidised and reduced helps.
Equipment
None required.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Match the keyword to the correct statement.
when an element replaces a less reactive element in a compound
name of the salts formed from halogens
non-metallic elements in Group 7 that react with metals to form salt
ionic compounds made of positive and negative ions
Q2.What happens when Group 2 elements react with a halogen?
Q3.Which is the correct symbol equation for a reaction between magnesium and chlorine?
Q4.Which is the correct formula for barium bromide?
Q5.Which of the following experiments will result in a displacement reaction?
Q6. + F₂ → 2CsF
Assessment exit quiz
6 Questions
Q1.What does a negative charge on an ion mean?
Q2.What type of reaction occurs when a metal atom loses an outer electron to become a positive stable ion?
Q3.Choose the correct half equation.
Q4.Which one of the following half equations is correct?
Q5.Which half equations show a reduction reaction?
Q6.Look at this displacement reaction:
F₂ (aq) + 2 KI (aq) → I₂ (aq) + 2KF (aq).
Identify a spectator ion.
To help you plan your 11 chemistry lesson on: Ionic equations: reactions of Group 1 and Group 7, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 11 chemistry lesson on: Ionic equations: reactions of Group 1 and Group 7, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 4 chemistry lessons from the Groups of the periodic table unit, dive into the full secondary chemistry curriculum, or learn more about lesson planning.