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Q. Symbol and element name of 110-118 atomic number symbol. You must have noticed in the periodic table that 110-118 elements have Uun, Uuu, Uub...symbol in the periodic table. A. Uun, Uuu, Uub all are IUPAC nomenclature of 110, 111, 112 respectively. You will this in this concept.

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A abhishek
Answered Sep 09, 2019
Q. Why do elements show different properties like odor, appearance, reactions, etc? A. Because all elements are different from each other in respective their mass, number of electrons, atomic number, etc. Every element has unique and different properties.

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A abhishek
Answered Sep 09, 2019
Which of the species is more stable O or N? Nitrogen is more stable than Oxygen due to half-filled electrons in Nitrogen.

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R RAVI RANJAN GUPTA
Answered Oct 10, 2019

Both are active, but O is more active w.r.t. N due to its high electronegativity[ En(O) = 3.5 & En(N) = 3.0 ]. Hence, N is more stable w.r.t. O

You just finished “Some basic concepts in chemistry” In this chapter, you have completed: (a) 16 concepts (b) 13 doubts (c) 43 number of questions (d) 61 number of examples Firstly you read some basic concepts like Dalton’s Atomic Theory and Laws of Chemical combinations then finally you moved to the Mole concept and molarity and normality. By studying this chapter, you have secured 3.5% weightage of complete chemistry syllabus and thus you have accomplished a solid foundation stone in your preparation journey as well. Make sure you practice more and more to achieve what you desire. Revision is the most important part so, don’t forget to do it and keep writing mock tests regularly. Keep it up !!!!

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A abhishek
Answered Sep 09, 2019
Q. Why do soaps not form lather in hard water? A. Hard water has various soluble salts of magnesium and calcium due to which the soaps are not able to form lather whereas soft water does not have these salts thus soaps make lather in soft water.

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A abhishek
Answered Sep 09, 2019
Q. What is the difference between molarity and normality? A. Molarity is the concentration measurement for any amount of substance present in 1 litre of solution. Normality is also the concentration measurement but it measures the number of equivalents of solute present in 1 litre of solution.

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A abhishek
Answered Sep 09, 2019
Q. What is limiting reagent? A. Limiting reagent is a reactant in any chemical reaction that gets consumed completely in the reaction.

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A abhishek
Answered Sep 09, 2019
What is the difference between empirical formula and molecular formula? A. Empirical formula is the simplest ratio of atoms present in the molecule like CH O while the molecular formula is the representation of the actual number of atoms present in the molecule.

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A abhishek
Answered Sep 09, 2019
Q.How to calculate equivalent weight? A. Equivalent weight is calculated by the molar weight divided by the n-factor. This n-factor can be valency, charge, acidity, basicity, etc.

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A abhishek
Answered Sep 09, 2019
Q. What is a mole? A. A mole is a number whose value is equal to 6.023 x 10 . It is used to calculate the number of atoms and molecules in chemistry.

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A abhishek
Answered Sep 09, 2019
Q. What is the difference between atomic mass and molecular mass? A. Atomic mass is the mass of a single atom or in other words, it is equal to the number of protons and neutrons. Molecular mass is the mass of all the atoms combined in the molecule.

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A abhishek
Answered Sep 09, 2019
Q.What are the limitations of Dalton's atomic theory? A. There are various drawbacks of Dalton's Atomic Theory:

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A abhishek
Answered Sep 09, 2019
  • It failed to explain anything about the structure of the atom.
  • It failed to explain how atoms of different elements combine and form molecules.
  • It failed to explain any distinction between atoms and molecules.
  • He proposed that atoms are indivisible but now it is false as atoms are further divided into electrons, protons and neutrons.
Avogadro number
Q. How was Avogadro number discovered?
A. It was discovered by measuring the 12g of C-12 carbon isotope. The number of atoms of carbon in this quantity was 6.022 x 10 . This number was known as Avogadro number.

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A abhishek
Answered Sep 09, 2019
Q. Let's think about why there are three units to measure temperature.
A. We know about K, C, and F. All three units are used in different places. For example, Fahrenheit is used to measure body temperature, celsius is used to measure environment temperature and kelvin is used to make calculations.

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A abhishek
Answered Sep 09, 2019
Why do we need SI units?

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A abhishek
Answered Sep 09, 2019
The International System of Units or SI unit is important in science and technology as it provides a consistent system of units for all types of quantities like length, weight, temperature, etc.
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