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IIT JEE Coaching

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R

Renu 18 May in  IIT JEE Coaching classes

Do movements of electrons and of nuclei affect each other?

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Jayasimha replied | 19 May

Yes, the electrons tug on the nucleus, and the nucleus tugs on the electrons, so their motions affect each other. But it's a very small effect because the nuclei are at least 3 orders of magnitude more massive than the electrons. We usually get away with assuming that the nuclei are clamped in place, while the electrons roam freely around and among them.

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Swagata replied | 29 May

Yes, the electrons tug on the nucleus, and the nucleus tugs on the electrons, so their motions affect each other. But it's a very small effect because the nuclei are at least 3 orders of magnitude more massive than the electrons. We usually get away with assuming that the nuclei are clamped in place, while the electrons roam freely around and among them.

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S

Sitaram 18 May in  IIT JEE Coaching classes

What is a "dalton"?

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Jayasimha replied | 19 May

The unified atomic mass unit (symbol: u) or dalton (symbol: Da) is the standard unit that is used for indicating mass on an atomic or molecular scale (atomic mass). One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol.

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Swagata replied | 29 May

a unit used in expressing the molecular weight of proteins, equivalent to atomic mass unit.

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N

Neha 18 May in  IIT JEE Coaching classes

What are alpha particles?

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Dinesh replied | 25 May

its fast moving packet containing 2 neutrons and 2 protons. its like helium nucleus .

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Ramaannuujam replied | 30 May

Nucleus of helium is called alpha particle.

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P

Prerana 18 May in  IIT JEE Coaching classes

What is thiosulfate ion, and what is it used for?

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Jayasimha replied | 19 May

Thiosulfate (S2O32-) is an oxyanion of sulfur produced by the reaction of sulfite ions with elemental sulfur in boiling water.USES :As photographic fixing agent.2. For extracting silver from ores 3.For manufacture of Paper and dechlorination of water.4.For determining dissolved oxygen and chemical analysis of oxidants 5. For Whitening cotton fabrics, bone, straw, and ivory.

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Shivaji replied | 10 Jun

Thiosulfate (S2O32-) is an oxyanion of sulfur produced by the reaction of sulfite ions with elemental sulfur in boiling water,
S(s) + SO32-(aq) S2O3-2(aq)
Thiosulfate is a reducing agent. It is routinely used as a titrant to determine concentrations of oxidants such as hypochlorite in bleach and dissolved oxygen in water. It instantly dechlorinates water, and is used...  more»
Thiosulfate (S2O32-) is an oxyanion of sulfur produced by the reaction of sulfite ions with elemental sulfur in boiling water,
S(s) + SO32-(aq) S2O3-2(aq)
Thiosulfate is a reducing agent. It is routinely used as a titrant to determine concentrations of oxidants such as hypochlorite in bleach and dissolved oxygen in water. It instantly dechlorinates water, and is used to stop bleaching action in the paper-making industry. «less

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S

Siraj 17 May in  IIT JEE Coaching classes

Can a compound be classified as ionic or molecular from its formula alone?

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Jayasimha replied | 19 May

No. Not always. But there is a rule of thumb that makes it easy to recognize many compounds as ionic.
Compounds that contain both metals and nonmetals are usually ionic. For example, Na2SO4 contains a metal (Na) and nonmetals (sulfur and oxygen), and so is expected to be ionic. But CO2 and CH4 contain only nonmetals, and are expected to be molecular compounds.

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Shivaji replied | 15 Jun

No. Not always. But there is a rule of thumb that makes it easy to recognize many compounds as ionic

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B

Balendra 17 May in  IIT JEE Coaching classes

What properties distinguish ionic compounds from covalent compounds?

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Jayasimha replied | 19 May

1.Electrical conductivity of the compound in aqueous solution.2.Electrical conductivity of the compound in liquid form.3.Hardness 4.Melting points and boiling points5.Enthalpies of fusion and vaporization

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Shivaji replied | 10 Jun

Electrical conductivity of the compound in aqueous solution. ...
Electrical conductivity of the compound in liquid form. ...
Hardness. ...
Melting points and boiling points.

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Answer

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P

Praveen 17 May in  IIT JEE Coaching classes

What is a binary compound?

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Mohit replied | 17 May

A binary compound is a chemical compound that contains exactly two different type of elements. Examples : calcium chloride, sodium fluoride, and magnesium oxide

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Jayasimha replied | 19 May

Binary means "two". A binary compound contains two different elements, chemically bound together.

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R

Raghav 17 May in  IIT JEE Coaching classes

What is a compound?

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Kamal replied | 17 May

A compound is a substance formed when two or more chemical elements are chemically bonded together

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Jayasimha replied | 19 May

Compounds are pure substances made of atoms of two or more elements chemically combined in fixed ratios.

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P

Parini 17 May in  IIT JEE Coaching classes

What is a carbonate, and what is it used for?

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Jayasimha replied | 19 May

A carbonate is a compound that contains the CO32- ion. Inorganic carbonates are ionic compounds that combine metal cations with the carbonate ion.USES:1.Soda ash (Na2CO3), or sodium carbonate, is used in the manufacture of glass, paper, rayon, soaps, and detergents.2.Limestone (CaCO3) is used in refining iron ore and manufacturing steel, making agricultural lime, making cement,...  more»
A carbonate is a compound that contains the CO32- ion. Inorganic carbonates are ionic compounds that combine metal cations with the carbonate ion.USES:1.Soda ash (Na2CO3), or sodium carbonate, is used in the manufacture of glass, paper, rayon, soaps, and detergents.2.Limestone (CaCO3) is used in refining iron ore and manufacturing steel, making agricultural lime, making cement, in scrubbers that remove sulfur from flue gases, and the manufacture of soda ash.3.Potash (K2CO3), or potassium carbonate, is used in the manufacture of glass.
4.Lithium carbonate (Li2CO3) is used in the production of glasses, ceramics, pharmaceuticals, and aluminum.
5.Strontium carbonate (SrCO3) is used to manufacture CRT tubes for televisions and computers. It also is used in red fireworks.
6.Nickel carbonate (NiCO3) is used in electroplating and in the manufacture of ceramics.
7.Cobalt carbonate (CoCO3) is used as a catalyst in the refining industry, as a ceramic pigment, and as a mineral supplement for livestock. «less

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Shivaji replied | 10 Jun

A carbonate is a compound that contains the CO32- ion. Inorganic carbonates are ionic compounds that combine metal cations with the carbonate ion
It is also used as a water softener, since carbonate can precipitate the calcium and magnesium ions present in "hard" water. Soda ash is also used to control pH (carbonate solutions neutralize acids, producing only carbon dioxide and water

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N

Nasreen 16 May in  IIT JEE Coaching classes

Can you predict the formulas for binary covalent compounds?

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Batchu Rohith replied | 06 Jul

yes u can easily predict

1.By two compounds which are different
2.When last compund is anion we can confirm it is binary covalent compund Ex:ClF3,ZnF,
3.formula ending with " ide " we can say it is binary covalent compound

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Narendra Kumar replied | 09 Jul

(CH3OH)

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Answer

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S

S 16 May in  IIT JEE Coaching classes

Where can I find the structure of a compound from its name or formula?

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Chaitanya replied | 07 Jun

NIST Chemistry webbook

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Alpine replied | 05 Jul

there are some books, for organic : O.P. Tondon , Cengege; Inorganic : O.P. Tondon

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A

Aneesh 16 May in  IIT JEE Coaching classes

Why is the anion suffix -ide used to name molecular compounds?

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Shivaji replied | 04 Jun

Simple acids, known as binary acids, have only one anion and one hydrogen. These anions usually have the ending "-ide.

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Ravindra Kumar replied | 08 Jun

Because anion have high electron negativity than positive ion in molecular compound and therefore, as per IUPAC nomenclaure used suffix of high EN element.

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N

Non 16 May in  IIT JEE Coaching classes

Where can I find the name for a specific compound, given only its molecular formula?

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Shivaji replied | 04 Jun

CS ChemFinder by Cambridge Software will accept molecular formulas and return compound names

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Manish replied | 28 Jun

make its structure and derive thru iupac nomenclature

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Answer

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P

Pratik 16 May in  IIT JEE Coaching classes

What do you call a compound that contains a metal and an acid anion?

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Gulab replied | 16 May

Coordination Compound

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Shivendra replied | 16 May

salt and hydrogen gas

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Answer

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D

Disha 15 May in  IIT JEE Coaching classes

Can the percent s and p character in a hybrid orbital be measured experimentally?

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Ajey replied | 21 Jun

With the help of hybridisation

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I

Iit replied | 29 Jun

It's important to realize that hybridization is part of the valence bond theory. It is not something that is directly observed in an experiment. You can explain a structure measured experimentally using hybridization, but you can't directly measure hybridization. Check more details in Bent's Rule, the above argument can be applied to any structure with a central atom and 2 or more...  more»
It's important to realize that hybridization is part of the valence bond theory. It is not something that is directly observed in an experiment. You can explain a structure measured experimentally using hybridization, but you can't directly measure hybridization. Check more details in Bent's Rule, the above argument can be applied to any structure with a central atom and 2 or more substituents. The key is that concentrating atomic s character in orbitals directed towards electropositive substituents is more favorable than removing s character from orbitals directed towards electronegative substituents. «less

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S

Sharmistha 15 May in  IIT JEE Coaching classes

What is hybridization?

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Atmanand replied | 16 May

In chemistry, hybridization (or hybridization) is the concept of mixing atomic orbitals into new hybrid orbitals (with different energies, shapes, etc., than the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds in valence bond theory.

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Ravi replied | 16 May

In chemistry, hybridisation is the concept of mixing atomic orbitals into new hybrid orbitals with different energies, shapes, etc., than the component atomic orbitals suitable for the pairing of electrons to form chemical bonds in valence bond theory.

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R

Rosary 15 May in  IIT JEE Coaching classes

Which member of a family of oxanions takes the -ate ending?

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Priyanka replied | 12 Jun

Phosphate carbonate etc

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Sanjeev replied | 13 Jun

Science in 2 months

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Answer

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P

Prerana 15 May in  IIT JEE Coaching classes

What is a valence bond?

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Atmanand replied | 16 May

Valence bond and molecular orbital theories are used to explain chemical bonding. Two atoms that have unpaired electrons in their orbitals can overlap to give rise to a chemical bond.

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Ravi replied | 16 May

Valence bond and molecular orbital theories are used to explain chemical bonding. Two atoms that have unpaired electrons in their orbitals can overlap to give rise to a chemical bond. A sigma bond ( ) forms when two atomic orbitals overlap between the nuclei of two atoms (also known as the internuclear axis).

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M

Mukesh 15 May in  IIT JEE Coaching classes

Where can I look up the formula for a compound, given its name?

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Harshit replied | 09 Jun

Which compound formula are you looking for, the basic ones are easily available on google

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Priyanka replied | 09 Jun

you can install chemdraw software and you can get IUPAC name for different structures

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A

Amandeep 14 May in  IIT JEE Coaching classes

How do I draw a Lewis structure for a molecule?

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Alpine replied | 05 Jul

Take more electroposivity element in centre and take E.N elements at terminal positions (H- should palce always at terminal position) then draw lewis structure by taking valence eletrons of each elements so that each element should statisfy octet rule

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Batchu Rohith replied | 06 Jul

3 steps to complete this problem
1.find valence electrons
2.Ex:find valence electrons for H2O molecule= for H2 =1*2=2 For O molecule=6 electrons Total=8 Valence electrons

There is a simple technique only by valence electrons

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Answer

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D

Dilpreet 14 May in  IIT JEE Coaching classes

What is electronegativity?

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Educa replied | 14 May

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

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Shivaji replied | 15 Jun

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The Pauling scale is the most commonly used. Fluorine (the most electronegative element) is assigned a value of 4.0, and values range down to caesium and francium which are the least electronegative at 0.7.

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Answer

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M

Manjunath 14 May in  IIT JEE Coaching classes

What do the terms 'mesomeric effect' and 'inductance effect' mean?

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Chaitanya replied | 07 Jun

Mesomeric effect" is just a synonym for "resonance effect". If electron density at a particular point in a molecule is higher or lower than what you'd expect from a single Lewis structure, and various canonical structures can be drawn to show how electron delocalization will explain the discrepancy, the difference in electron density is called a "mesomeric effect".
An inductive...  more»
Mesomeric effect" is just a synonym for "resonance effect". If electron density at a particular point in a molecule is higher or lower than what you'd expect from a single Lewis structure, and various canonical structures can be drawn to show how electron delocalization will explain the discrepancy, the difference in electron density is called a "mesomeric effect".
An inductive effect is the polarization of a chemical bond caused by the polarization of an adjacent bond. (Field effects are polarization caused by nonadjacent bonds). «less

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Alpine replied | 05 Jul

mesomeric effect is seen in only conjugated and unsaturated compounds and its involves delocalisations of Pi electrons including lone pair eletrons whereas inductive effect is seen in both saturated and unsaturated compounds and it involves tranmission of sigma electrons through carbon chain. I.E and M.E are permanant effects.

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A

Advm 14 May in  IIT JEE Coaching classes

How do I draw a Lewis structure for sucrose?

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Oasis Gurgaon replied | 14 May

Start with the skeleton structure of sucrose. You can't figure out the skeleton structure with just the molecular formula in hand, as you've discovered. At each angle in the stick model, there is a carbon atom. Each carbon atom is connected to exactly 4 other things in this structure (there are no multiple bonds). The oxygens each must have two lone pairs to have an octet, because...  more»
Start with the skeleton structure of sucrose. You can't figure out the skeleton structure with just the molecular formula in hand, as you've discovered. At each angle in the stick model, there is a carbon atom. Each carbon atom is connected to exactly 4 other things in this structure (there are no multiple bonds). The oxygens each must have two lone pairs to have an octet, because each has two single bonds. «less

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Shivaji replied | 15 Jun

Draw a skeleton structure
Count total valence electrons.
Connect the structure
Place electrons on outside atoms
Place all remaining electrons on the central atom.

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Answer

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H

Harshitha 14 May in  IIT JEE Coaching classes

What is the difference between valence, and number of valence electrons?

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Oasis Gurgaon replied | 14 May

The combining capacity of an atom is called its valency. Actually it can be defined as the number of electrons that an atom may lose (or) gain during a chemical reaction (or) the number of electrons shared.
Ex: In water molecule H?O (H - O -- H)
Valency of Hydrogen is 1 (as it combines with Oxygen atom by one single bond) and valence electrons in Hydrogen = 1
...  more»
The combining capacity of an atom is called its valency. Actually it can be defined as the number of electrons that an atom may lose (or) gain during a chemical reaction (or) the number of electrons shared.
Ex: In water molecule H?O (H - O – H)
Valency of Hydrogen is ‘ 1 ‘ (as it combines with Oxygen atom by one single bond) and valence electrons in Hydrogen = 1
Valency of Oxygen is ‘2’ (as it combines with two Hydrogen atoms by two bonds), but valence electrons in oxygen = 6
The numbers of electrons in outermost shell (or) valency shell of an atom are called valency electrons.
Based on valency electrons the group number of an atom can be found.
Ex: Number of valence electrons in chlorine are 7 so it belongs to VIIA - group, but its valency is 1.

So, it is to be understood that some times valency is equal to valence electrons, but not all the time «less

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Shivaji replied | 15 Jun

Valence electrons are the number of electrons in the outermost energy level of an atom.
Valency is the number of electrons an atom needs to gain or lose in order to have a full outermost energy level.

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Answer

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Y

Yashraj 13 May in  IIT JEE Coaching classes

Mention the important considerations required while fabricating a p-n junction diode to be used as a Light Emitting Diode (LED). What should be the order of band gap of an LED if it is required to emit light in the visible range?

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Quest Academy replied | 13 May

1. The reverse breakdown voltages of LEDs are very low, typically around 5V. So care should be taken while fabricating a p-n junction diode so that the high reverse voltages do not appear across them.
2. There is very little resistance to limit the current in LED. Therefore, a resistor must be used in series with the LED to avoid any damage to it.
The semiconductor used...  more»
1. The reverse breakdown voltages of LEDs are very low, typically around 5V. So care should be taken while fabricating a p-n junction diode so that the high reverse voltages do not appear across them.
2. There is very little resistance to limit the current in LED. Therefore, a resistor must be used in series with the LED to avoid any damage to it.
The semiconductor used for fabrication of visible LEDs must at least have a band gap of 1.8 eV (spectral range of visible light is from about 0.4 ?m to 0.7 ?m, i.e., from about 3 eV to 1.8 eV). «less

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