World's First Calorimeter
The world’s first ice-calorimeter, used in the winter of 1782-83, by Antoine Lavoisier and Pierre-Simon Laplace, to determine the heat evolved in various chemical changes; calculations which were based on Joseph Black’s prior discovery of latent heat. These experiments mark the foundation of thermochemistry.
Source from Wikipedia
Hanging cloth
This doesn’t mean that you can hang the cloth outside even when it is raining, but this is about indoor drying. This issue comes to me because it has been raining for 2 days here in Labuan. So, why is it hanged cloth will eventually dry even if it is raining?
Sodium Chloride in Solid Form
Questions:
1. Define solubility. (1mark)
2. The solubility of silver sulphate is 1.5 x 10–² mol/L. Calculate the solubility product of the salt. (3mark)
Level of difficulty: Easy.
Answer: 1. Refer to your book or your lecturer. 2. Ksp= 1.35×10-5
Glucose
Questions:
1. Define colligative properties. (1 mark)
2. 10.0 g of glucose (C6H12O6) has been dissolved in 100.0 g of water. Pure vapour pressure for water is 23.8 torr. What is the vapour pressure of the solution? (3 mark)
Level of difficulty: Easy.
Ans: 1. Refer to lecturer. 2. 23.50 torr
