[S1 Maths + Science PMCians]
What we did in 2 hours:
This week we continued with our Science Headstart on Chemistry – Ionic Bonding. We started our lesson with a quick recap on what we have learnt in the last lesson, (electron shells, electronic configurations and formation of ions).
After having a good understanding that metals tend to form cations and non-metals tend to form anions, as well as the charges of the ions formed, we proceed to learn a new concept which is about ionic bonding.
– Ionic bonds are formed by transfer of electrons from metal atoms to non-metal ions.
We also learnt to write the chemical formulae and draw the dot and cross diagrams for ionic compounds.
Step 1: Identify the charges of the cation and anion involved.
Step 2: Deduce the number of ions required by balancing the charge.
Three physical properties of ionic compound:
1. High melting and boiling points (due to strong electrostatic force of attractions between cations and anions)
2. Usually soluble in waterbut not in organic solvents.
3. Conduct electricity at moltenor aqueousstate.
Lastly, we wrapped up the lesson with a MCQs practice.
This is our last Headstart lesson for 2020 S1 to 2021 S2. You certainly deserve a break after all the hard work.
Till then, enjoy your school holidays. Stay safe and healthy.
See you again in December! 🙂
Your friendly tutors,
The S1MA+SCI Team