Determining concentration in ppm
A 500 gm tooth paste sample has 0.2g fluoride concentration. Determine the concentration of F in terms of ppm level: (a) 250 (b) 200 (c) 400 (d) 1000Answer: (c) F-ions in ppm = (0.2/500) x 106 = 400
Describe the difference between law of multiple proportions and law of definite proportions?
What is the utilization of glacial acetic acid? Briefly describe the uses.
It may be prepared by the action of phosphorus on thionyl chloride.P4 + 8SOCl2 4
A mechanism for enzyme-catalyzed reactions that leads to the typical rate equation for these reactions can be described.A variety of rate equations are required to portray the rates of enzymes catalyzed reagents and physical conditions that are encountered
order of decreasing basicity of urea and its substituents
When 0.01 mole of sugar is dissolved in 100g of a solvent, the depression in freezing point is 0.40o. When 0.03 mole of glucose is dissolved in 50g of the same solvent, depression in the freezing point will be:(a) 0.60o (b) 0.80o
why allyl halide and haloarenes are more reactive than alkyl halide towards nucleophilic substitution
Describe briefly the three facts on the evaporation?
1. Physical state: the first three aliphatic acids are colourless liquids with pungent smell. The next six are oily liquids with an odour of rancid butter while the higher members are colourless, odourless waxy solids. Benzoic acid is referred to
parachloroaniline is strong base than paranitroaniline
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