8/12/2019 Chemistry Interview Capsule

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Chemistry Interview Capsule

What do we study in Chemistry?Chemistry, a branch ofphysical science,is the study of the composition, structure, properties and

change ofmatter.Chemistry is chiefly concerned withatoms and their interactions with other atoms

What is atom?Structure of atom?Smallest recognized division of achemical element

The atom is a basic unit ofmatter that consists of a dense centralnucleus surrounded by

acloud ofnegatively chargedelectrons.Theatomic nucleus contains a mix of positively

chargedprotons and electrically neutralneutrons (except in the case ofhydrogen-1,which is the

only stablenuclide with no neutrons). The electrons of an atom are bound to the nucleus by

theelectromagnetic force

Difference between electron, proton and neutron? What is difference between organic and inorganic chemistry?

The primary difference between organic compounds and inorganic compounds is that organiccompounds always contain carbon while most inorganic compounds do not contain carbon Also;

almost all organic compounds contain carbon-hydrogen or C-H bonds.

What is Redox (Reduction-Oxidation) reaction?Redox (reduction-oxidation) reactions include allchemical reactions in which atoms have

theiroxidation state changed; in general, redox reactions involve the transfer

ofelectrons betweenspecies.

What is Oxidation State?The electron needed to complete its Valance Shell.

What is Periodic table?The periodic table is a tabular arrangement of thechemical elements,organized on the basis of

theiratomic numbers,electron configurations(electron shell model), and recurringchemical

properties.Elements are presented in order of increasing atomic number (the number of protons in

the nucleus).

Who founded Periodic table?- Mandeleev Total how many elements are in Periodic table? - 118 What is atomic number and atomic weight?

The atomic number (also known as the proton number) is the number ofprotons found in

thenucleus of anatom and therefore identical to thecharge number of the nucleus.

What are Metals/Non Metals/Inactive Gases/radio nuclear elements?Metal: Elements which have positive oxidation state. [Na,K,Ca]

Non Metals:Elements which have negative oxidation state. [O, S, P]

Inactive Gases: Elements which have complete Valance Shell. [He,Ne,Ar,Kr, Xe]

Radio Active Element: Elements which are highly unstable in nature and decomposes after a fixed

time and radiate alpha, beta and gamma radiations. [U,Pu,Th]

http://en.wikipedia.org/wiki/Physical_sciencehttp://en.wikipedia.org/wiki/Matterhttp://en.wikipedia.org/wiki/Atomhttp://en.wikipedia.org/wiki/Chemical_elementhttp://en.wikipedia.org/wiki/Matterhttp://en.wikipedia.org/wiki/Atomic_nucleushttp://en.wikipedia.org/wiki/Electron_cloudhttp://en.wikipedia.org/wiki/Electric_chargehttp://en.wikipedia.org/wiki/Electronshttp://en.wikipedia.org/wiki/Atomic_nucleushttp://en.wikipedia.org/wiki/Protonhttp://en.wikipedia.org/wiki/Neutronhttp://en.wikipedia.org/wiki/Hydrogen-1http://en.wikipedia.org/wiki/Nuclidehttp://en.wikipedia.org/wiki/Electromagnetic_forcehttp://en.wikipedia.org/wiki/Chemical_reactionhttp://en.wikipedia.org/wiki/Oxidation_statehttp://en.wikipedia.org/wiki/Electronhttp://en.wikipedia.org/wiki/Chemical_specieshttp://en.wikipedia.org/wiki/Chemical_elementhttp://en.wikipedia.org/wiki/Atomic_numberhttp://en.wikipedia.org/wiki/Electron_configurationhttp://en.wikipedia.org/wiki/Chemical_propertyhttp://en.wikipedia.org/wiki/Chemical_propertyhttp://en.wikipedia.org/wiki/Protonhttp://en.wikipedia.org/wiki/Atomic_nucleushttp://en.wikipedia.org/wiki/Atomhttp://en.wikipedia.org/wiki/Charge_numberhttp://en.wikipedia.org/wiki/Charge_numberhttp://en.wikipedia.org/wiki/Atomhttp://en.wikipedia.org/wiki/Atomic_nucleushttp://en.wikipedia.org/wiki/Protonhttp://en.wikipedia.org/wiki/Chemical_propertyhttp://en.wikipedia.org/wiki/Chemical_propertyhttp://en.wikipedia.org/wiki/Electron_configurationhttp://en.wikipedia.org/wiki/Atomic_numberhttp://en.wikipedia.org/wiki/Chemical_elementhttp://en.wikipedia.org/wiki/Chemical_specieshttp://en.wikipedia.org/wiki/Electronhttp://en.wikipedia.org/wiki/Oxidation_statehttp://en.wikipedia.org/wiki/Chemical_reactionhttp://en.wikipedia.org/wiki/Electromagnetic_forcehttp://en.wikipedia.org/wiki/Nuclidehttp://en.wikipedia.org/wiki/Hydrogen-1http://en.wikipedia.org/wiki/Neutronhttp://en.wikipedia.org/wiki/Protonhttp://en.wikipedia.org/wiki/Atomic_nucleushttp://en.wikipedia.org/wiki/Electronshttp://en.wikipedia.org/wiki/Electric_chargehttp://en.wikipedia.org/wiki/Electron_cloudhttp://en.wikipedia.org/wiki/Atomic_nucleushttp://en.wikipedia.org/wiki/Matterhttp://en.wikipedia.org/wiki/Chemical_elementhttp://en.wikipedia.org/wiki/Atomhttp://en.wikipedia.org/wiki/Matterhttp://en.wikipedia.org/wiki/Physical_science

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What is Acid/Base/Salt?Acid: Compound which releases H+ ion in aqueous medium [HCL,HNO3]

Base: Compound which releases OH- in aqueous medium [NaOH,Ca(OH)2]

Salt: Compound which is formed by the reaction of Acid and Base [NaCl]

What are Isotopes and isobars?Isotopes: Chemical elements, which have same number of protons but different numbers of

neutrons. [C-12, C-13, C-14 (Atomic number - 6)]

Isobars (nuclide): Chemical elements, which have same number of atomic weight [S, Cl, Ar, K, Ca (all

having atomic weight 40)]

Elements and their Atomic NumberElement Name Atomic Number Atomic Weight

H Hydrogen 1

He Helium 2

Li Lithium 3

B Boron 5

C Carbon 6

N Nitrogen 7

O Oxygen 8

Na Sodium 11

Mg Magnesium 12

Al Aluminium 13

P Phosphorous 15

S Sulphur 16

Cl Chlorine 17

Fe Iron 26

Cu Copper 29

Zn Zinc 30

Chemical Formulas:

Compound Chemical Formula

Water H2O

Nitrogen N2

Methane CH4

Benzene C6H6

Sodium Chloride NaCl

Sulphuric Acid H2SO4

Hydrochloric Acid HCL

Nitric Acid HNO3

Calcium Hydroxide Ca(OH)2