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Q. What do you mean by Rounding off numbers?
Rounding off numbers while you report a calculation your answer should have no more significant figures than the piece of data you used in your computation with the fewest number of significant figures. Therefore if you calculate the density of an object with a mass of 12.33 g in addition to a volume of 19.1 cm3 your answer must have only three significant figures. Though when you divide these quantities using your calculator it will show 0.6455497-lots more figures than you can report in your answer. You must round off the number to three significant figures or 0.646.
write a short note on colour and constitution
1. A sample of water contains: suspended matter = 100 mg; Ca(NO3)2 = 16.4 mg/L; MgSO4 = 24 mg/L; MgCl2 = 19 mg/L; NaOH = 40 mg/L and KOH = 56 mg/L. Calculate temporary, permanent a
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Thats a hypothesis and Yes it becomes a string.
Q. Explain about Conservation of Mass? Conservation of Mass above two centuries ago chemists established a fundamental law called the law of conservation of mass. This l
Why the rate of ketone halogenation is independent Because the rate of ketone halogenation is independent of the halogen concentration, the rates of halogenation of the same ke
A diluted polymer solution with a density of 1130 kg/m3 was extruded by a capillary tube of 3.5 mm internal diameter and 1 m long. The following results were contained at 25°C.
How can the enthalpy of the hydrogenation of benzene be measured from its enthalpy of combustion and the enthalpies of combustion of cyclohexane and hydrogen? Make use of Hess's la
CARBON, SILICON AND GERMANIUM With the valence electron configuration s 2 p 2 the nonmetallic group of elements 14 may form compounds with four tetrahedrally directed covalent
potentiometric titration
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