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Physical Chemistry
How long will it take for a 40.0 gram sample of I-131 (half life = 8.040 days) to decay to 1/100 its original mass?
Expert's answer
Expert's answer
Physical Chemistry
the following nuclei do not lie in the band of stability. how would they be expected to decay? justify your answer using the neutron-proton ratio
Physical Chemistry
Draw the Born Haber cycle for CaS( 1Mole Calcium Sulphide) inserting the appropriate energy, states of the substances and the energy values as well as their respective energy changes
Physical Chemistry
Copper chloride (CuCl2) is a stable compound, whereas neither CaCl nor CaCl3 are known as unstable compounds. Account for this observation.
Physical Chemistry
Two containers, A and B, are separated by a tap. A has a volume of 15 litres and contains one mole
of helium at 25°C. B has a volume of 45 litres and is completely evacuated.
a. Calculate the change in entropy that occurs when the tap is opened.
of helium at 25°C. B has a volume of 45 litres and is completely evacuated.
a. Calculate the change in entropy that occurs when the tap is opened.
Physical Chemistry
10cm3 of 18.40M sulphuric acid was added to distilled water in a 250ml volumetric flask. The flask was stoppered, turned upside down several times and carefully topped to the mark with more distilled water. After 20minutes it was observed that the solution had dropped by 2ml from the mark.
a) How does this solution behave w.r.t. Raoult’s law? Explain your answer. b) State other observations you may note on mixing the two liquids. c) Draw a labelled vapour pressure-composition phase diagram for the solution. d) Calculate the molarity of the solution in the volumetric flask.
a) How does this solution behave w.r.t. Raoult’s law? Explain your answer. b) State other observations you may note on mixing the two liquids. c) Draw a labelled vapour pressure-composition phase diagram for the solution. d) Calculate the molarity of the solution in the volumetric flask.
Physical Chemistry
1a) State Raoult’s law. b) Name the components of a solution that deviates positively from Raoult’s law. c) Why does the solution in 1b deviate from ideal behavior?
Physical Chemistry
Ethanal and Carbon disulphide are miscible liquid which form a two component and two phase system.
Suggest a reason why the mixture shows a positive deviation. (2 marks) d. Although the mixture cannot be separated into the two components by fractional distillation, chemical methods can be used. i. Suggest a reason why the mixture cannot be separated by fractional distillation. ii. Briefly describe chemical reactions for obtaining one of the two components from the mixture. (5marks)
Suggest a reason why the mixture shows a positive deviation. (2 marks) d. Although the mixture cannot be separated into the two components by fractional distillation, chemical methods can be used. i. Suggest a reason why the mixture cannot be separated by fractional distillation. ii. Briefly describe chemical reactions for obtaining one of the two components from the mixture. (5marks)
Physical Chemistry
Sketch and label the boiling point-composition curve at constant pressure for the mixture of ethanol and methanol
Physical Chemistry
100 ml of 0.1 M NaOH is titrated against 0.1 M HCL taken in the burette. what is molarity of resulting solution when the alkali is half neutralized.
