[S2 Maths + Science PMCians]
What we did in 2 hours:
Following the two weeks of Maths Headstart, this week we started our Chemistry Headstart on KPT and Chromatography.
We begin our lesson with a recap on what we had learnt in Sec 1 about the Particulate Model of Matter at different states – the arrangement and movement of particles at solid, liquid and gaseous states.
We also looked into the heating/cooling curve of matter:
1) temperature increases/decreases as particles gain/loss heat and vibrate or move faster/slower.
2) temperature remains constant at melting/freezing and boiling/condensation points as the heat energy is used to overcome/build the force of attraction between particles. => this is when change in state take place
Then we learnt about diffusion and how it is affected by temperature and molecular mass.
1) Temperature increases (particles move faster), rate of diffusion increases and vice versa.
2) Molecular mass increases (particles move slower), rate of diffusion decreases and vice versa.
**Note diffusion is the random and constant movement of particles to fill up all available space.
Finally we looked at applications of chromatography.
1) Substances in a mixture are separated based on their solubility in a particular solvent.
2) Pure substance shows only 1 spot whereas impure substance shows >1 spot.
3) The Rf value of a substance is fixed in a given solvent.
We wrapped up the lesson with Quick-Fire MCQs to test and strengthen what the students have learnt in the 2-hour lesson.
Next lesson we will continue Part 2 of our Chemistry Headstart on Chemical Equations.
See you soon! 🙂
Your friendly tutors,
The S2MA+SCI Team