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Q. Describe SI System and Standards
Ans:
What units you will you use science class? Long ago people decided that the "foot" must be standardized so that when I measure a cow and tell you about it, you can use this information so that you know the exact size of the cow. Originally this standard was the King's foot, but that would change with each new "ruler." Someone then had the brilliant idea of a standard length for a foot. Then all measurements were made compared to this "standard foot" which was not subject to growth or death. This system of measurements had the drawback of making the math hard - 12 inches to a foot, 3 feet to a yard, 5,280 feet in a mile and so on.
Beyond the basic meters, kilograms and seconds, we define some secondary or derived standards like amperes, moles, and candela. They are defined in terms of meters, kilograms and seconds.
But we find that there are some combinations of units that pop up a lot so we give them names like newtons or joules which are equivalent to a particular product/quotient of the basic three units, meters, kilograms and seconds.
The difference between an ideal gas and a real gas is that real gases will not strictly follow the laws established for ideal gases, because of real-world characteristics. An idea
Two compartments each of 1m 3 capacity are connected by a valve and insulated from the surroundings and from each other. One compartment contains saturated steam at 683.6 kPa and
obtain the mole of substance in the following. 7.05g Br2
What happens when complex compounds consist of legand?
first two groups are metal but why hydrogen is placed in first group
fitration
PFEFFER METHOD
Q. Uses of selenium? Uses of selenium include photocopying process of xerography, decobrisation of glasses and as a catalytic agent particularly in the isomerisation of certain
No. of KMnO4 required to oxidise 1 mole of Fe(C2O2) in acidic medium? Solution) 1 mole of KMnO4 is required for oxidation of 1 mole of Fe(C2O2). 2KMno4+2Fe(C2O2)+6H2SO4 = K2S
Illustrate the term Rolling with diagram A pair of cylindrical rollers made of iron or steel rotate in opposite direction with a gap between them which is smaller than cros
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