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How would you confirm that a colorless liquid given to you is pure water?

Asked by Asif 07/12/2017 Last Modified 21/01/2018

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Why we can get the smell of perfume sitting several metres away?

Perfume contains highly volatile aromatic liquids. These liquid on coming out of bottle gets converted into gas. Now gas as the tendency to move as well as to occupy space wherever possible. As it is pressed...

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Helium atom has an atomic mass of 4u and two protons in its nucleus. How many neutrons does it have?

Mass number of Helium = 4 Number of protons = 2 Number of neutrons(n) = Number of Mass(A) — Number of proton (P) = 4 – 2 = 2 Thus, No. of neutrons = 2

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What is meant by the term chemical formula?

Chemical formula is an expression which shows the number and type of atoms present in one molecule of a substance. Atoms are denoted by their symbols. For example the chemical formula for water is H2O...

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What are alloys?

It is mixture of metals example steel,bronze. Bronze is alloy of aluminium,nickel or zinc and manganese. Steel is made of iron,chromium also small percentage of carbon,nickel,

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Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?

100 gm of sodium will have (Given mass / molar mass )x Avogadro's Number = (100/23) x 6.022 x 10^23 = 2.62 x 10^24 atoms 100 gms of Iron will have (100/56) x 6.022 x 10^23 = 1.07 x 10^24 atoms So 100 gms of Sodium will have more atoms.

Nasar

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