Some properties of metals, semi-metals and non-metalsAdministrator2020-10-06T12:48:24+02:00
Ask the learners which elements are the most on the Periodic Table. [Metals]
They must also identify which elements are the least. [Semi-metals]
Establish if they know why aeroplanes are not made of iron.
[Possible answers: Iron is too heavy; the aeroplane will not be able to take off; the aeroplane would never be able to fly; etc.]
Teacher Input 3
Explain to the learners what ‘properties’ in chemistry means.
[Chemical Property Definition: A chemical property is a property or behaviour of a substance when it undergoes a chemical change or reaction which can include toxicity, oxidation, and flammability. Iron will rust once it becomes oxidized].
Tell the learners that physical properties include colour, odour, melting point, boiling point, density, texture, appearance, etc.
Present an overview of the properties of the different elements by using Presentation 2: Properties of metals, semi-metals and non-metals.
Learner Activity 3
The learners give feedback.
They can also share interesting facts that captured their attention.
Complete Worksheet C: Properties of metals and non-metals.
Teacher to use Worksheet C: Memorandum to mark the learners’ work.
Teacher Input 4
Inform the learners that they will be working in groups and compete against one another.
Select 3 metal elements and 3 non-metal elements.
Write one property of each selected element.
Learner Activity 4
The groups brainstorm ideas and jot down the elements which they had selected.
They can use any resource materials, e.g. notebooks, textbook, etc.
Each group gets an opportunity to ask another group a question and points are allocated.
Teacher Input 5
Mention a few elements that we usually use daily and give the learners an opportunity to share and expand their knowledge on the elements. A few examples:
Chlorine [clean swimming pools].
Iron [use to manufacture steel and stainless steel].
Oxygen [Humans and animals breathe in oxygen; our bodies need it for energy].
Copper [used in electrical wires; it is good conductors of electricity].
Aluminium [cooking pots and pans; constructing doors and windows].