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Hi MATE

hope this helps you

first of all

what is ferric chloride test?
ferric chloride TESTIS performed to determine or check the presence of phenols in the given sample of compounds.

the compounds which gives positive RESPONSE are
Enols, hydroxamic ACIDS, oximes, and sulfinic acids

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There is a cyclopean difference between molecular mass and formula mass.

Molecular mass is the mass of a given molecule or compound but now the clinch here is that it remains neutral despite the presence of zillions of molecules. For ex: Molecular mass of CO2 = 12*1 + 16*2=44.

2.But, now the formula mass is something different. IT IS THE MOLECULAR MASS OF THE WHOLE COMPOUND CONTAINING X NO. OF MOLECULES OF THAT COMPOUND. LET me clarify it with example: Like we have to FIND the formula mass of 10Na2SO4.H2O= 10[23*2+32+16*4+2*1+16*1] = 10*180= 1800.

So, it is pretty clear that formula mass is ‘x’ times the molecular mass of that compound.

Example: Calculating the Molar Massof a Compound. There are three elements - CARBON, hydrogen and OXYGEN - so find their atomic masses in the periodic table: 12.0107 grams per mol for carbon, 1.00794 grams per mol for hydrogen, and 15.9994 grams per mol for oxygen.
As an example, consider sodium chloride, NaCl, the chemical name for common table salt. Sodium chloride is an ionic compound composed of sodium cations, Na+, and chloride anions, Cl−, combined in a 1:1 RATIO. The formula mass for this compound is computed as 58.44 amu (see Figure 3).

In one molecule of graphite, each carbon atom is COVALENTLY bonded to three other carbon atoms.

Graphite has a giant structure. It also has a layer structure. In graphite, the carbon atoms JOIN together to form hexagonal rings which form each layer. There are millions of layers of carbon atoms in a CRYSTAL of graphite. These layers are held together by weak Van der WAAL's force.

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At 100DEGREES CELCIUS

Because in kcn the bond between k and CN is IONIC bond and its break in low ENERGY
but in agcn the bond between silver and cyanide is co valant bond and it's TAKE high energy to break

Hey MATE!

electronic configuration of

Be =1s2 2s2

it show's its outer orbit is fulfilled..
so it is stable..
having HIGH electron enthalpy..
i.e requires more ENERGY to REMOVE electron

but in CASE of boron

B=1s2 2s2 2p1

its outermost shell have only one electron.. in p orbital ...which can be removed easily..
having low electron enthalpy.

correct answer is optipn b

hope it will help you..

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Molecular weight of H2SO4 = 98 G/mol

20 g of H2SO4 = 20 /98 ≈ 0.20 moles

1 MOLE = 6.023 × 10^23 molecules

0.20 moles =12.046 × 10^22 molecules

One molecule of H2SO4 has 4 OXYGEN atoms,

therefore ;

Number of oxygen ATOM in 0.2 mole = 4 × 12.046 × 10^22

= 48.184 × 10^22 

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Homogeneous catalysis and organometallic chemistry is an important RESEARCH area in the Catalysis group. The group, led by Professor Tilset, focuses on synthesis, characterisation and testing of metal COMPLEXES with the aim to develop and understand new reactions, catalytic as well as NON stochiometric.

Tenzing NORGAY was BORN in nepal and is obtained referred as SHERPA

ANSWER:

Since the molecule contains one chiral carbon, therefore the molecule BECOMES optically active. The carbon marked with star is chiral. HENCE, the LOWEST alcohol that is optically active is Butan-2-ol.

Hydrogen

H
Atomic Number = 1
Atomic MASS = 1.008

Helium

He
Atomic Number = 2
Atomic Mass = 4.003

Lithium

Li
Atomic Number = 3
atomic mass 6.941

Beryllium

Be
Atomic Number = 4
Atomic Mass = 9.012

Boron

B
Atomic Number = 5
Atomic Mass = 10.81

Carbon

C
Atomic Number = 6
Atomic Mass = 12.011

Nitrogen

N
Atomic Number = 7
Atomic Mass = 14.007

Oxygen

O
Atomic Number = 8
Atomic Mass = 15.999

Fluorine

F
Atomic Number = 9
Atomic Mass = 18.998

Neon

Ne
Atomic Number = 10
Atomic Mass = 20.1797

Sodium

Na
Atomic Number = 11
Atomic Mass = 22.9897

Magnesium

Mg
Atomic Number = 12
Atomic Mass = 24.305

Aluminum

Al
Atomic Number = 13
Atomic Mass = 26.981

Silicon

Si
Atomic Number = 14
Atomic Mass = 28.085

Phosphorus

P
Atomic Number = 15
Atomic Mass = 30.974

Sulfur

S
Atomic Number = 16
Atomic Mass = 32.06

Chlorine

Cl
Atomic Number = 17
Atomic Mass = 35.45

Argon

Ar
Atomic Number = 18
Atomic Mass = 39.948

Potassium

K
Atomic Number = 19
Atomic Mass = 39.098

Calcium

Ca
Atomic Number = 20
Atomic Mass = 40.078

Scandium

Sc
Atomic Number = 21
Atomic Mass = 44.956

Titanium

Ti
Atomic Number = 22
Atomic Mass = 47.867

Vandium

V
Atomic Number = 23
Atomic Mass = 50.9415

Chromium

Cr
Atomic Number = 24
Atomic Mass = 51.9951

Manganese

Mn
Atomic Number = 25
Atomic Mass = 54.938

Iron

Fe
Atomic Number = 26
Atomic Mass = 55.845

Cobalt

Co
Atomic Number = 27
Atomic Mass = 58.933

Nickel

Ni
Atomic Number = 28
Atomic Mass = 58.6934

Copper

Cu
Atomic Number = 29
Atomic Mass = 63.546

Zinc

Zn
Atomic Number = 30
Atomic Mass = 65.38

Gallium

Ga
Atomic Number = 31
Atomic Mass = 69.723

Germanium

Ge
Atomic Number = 32
Atomic Mass = 72.63

Arsenic

As
Atomic Number = 33
Atomic Mass = 74.9216

Selenium

Se
Atomic Number = 34
Atomic Mass = 78.96

Bromine

Br
Atomic Number = 35
Atomic Mass = 79.904

Krypton

Kr
Atomic Number = 36
Atomic Mass = 83.798
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CARBON DIOXIDE is RELEASED

Https://www.learncbse.in/important-QUESTIONS-for-cbse-class-9-science-atoms-and-molecules/
in this link you find different types of questions such as 1 MARK questions , 2 marks questions , etc.

Because CHLORINE NEEDS only 1 electron to COMPLETE its octate and to become a stable
Whereas carbon is tetra VALENT and it needs 4 electron to complete its octate

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Hii dear here is your answer


Ionic CRYSTALS are composed of alternating positive and negative ions.Metallic crystals consist of metal cations SURROUNDED by a "sea" of mobile valence electrons. Covalent crystals are composed of atoms which are COVALENTLY bonded to one another.Molecular crystals are held together by WEAK intermolecular forces.


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Hey frnd this may help U...
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent. It is MEASURED in terms of the maximum amount of solute dissolved in a solvent at equilibrium. The resulting solution is called a saturated solution.
Solubility of sugar:
Experiment...:
Add a 1/2 cup of lukewarm tap water to a plastic cup. Weigh about 5 tablespoons of sugar and gradually add the sugar to the tap water, stirring to mix...
Solubility of ammonia:
Experiment...:
Ammonia is NH3 due to the lone pair at the nitrogen the lone pairs in oxygen from the H2O are attracted forming hydrogen bonds consequently being SOLUBLE in water .Solubilityof a substance in water relies upon on its polar NATURE. considering water is polar molecule, it dissolves readily polar molecules.
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Smoke is a FORM of gas. it have some MASS but negligible so it take the shape of substance where it is present. there is kinetic ENERGY acts INSIDE it which enable them to SKIP out from the container

Determination of number of moles of hydrogen gas,

N = PV/RT = 1 *1/0.082 *298 = 0.0409

The concerned reaction is H2 → 2H ; ∆H = 436 kJ mol-1

Energy required to BRING 0.0409 moles of hydrogen gas to atomic state = 436 *0.0409 = 17.83 kJ

Calculate of total number of hydrogen atom in 0.0409 mole of H2 gas

1 mole of H2 gas has 6.02 * 1023 molecules

0.0409 mole of H2 gas = 6.02 *1023/1 * 0.0409 molecules

Since 1 MOLECULE of H2 gas has 2 hydrogen atoms 6.02 * 1023 * 0.0409 molecules of H2GAS

= 2 * 6.02 * 1023 * 0.0409 = 4.92 * 1022atoms of hydrogen since energy required to excite an electron from the ground state to the NEXT excited state is given by

E = 13.6 eV = 13.6 * (1/1 – 1/4) = 13.6 * 3/4 = 10.2eV

= 1.632 * 10-21 kJ

Therefore energy required to excite 4.92 * 1022 ELECTRONS

= 1.632 * 10-21 * 4.92 * 1022 kJ = 8.03 * 10 = 80.3 kJ

Therefore total energy required = 17.83 + 80.3 = 98.17 kJ

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➡️ Density - is DEFINED as MASS per UNIT volume

_________________

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The chemical formula for MAGNESIUM hydroxide is Mg(OH)2

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↪↪On the basis of RUTHERFORD's MODEL of an ATOM, PROTONS and neutrons are present in the NUCLEUS of an atom.↩↩

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No it FORM etyle ACETATE+ h²o

then the best fuel is LPG (liquified petroleum gas ) it burns with a blue flame which is a sign of complete COMBUSTION.  hence, NOTHING gets DEPOSITED on the pan

A measure of the energy CONTAINED in the crystal lattice of a compound, equal to the energy that would be RELEASED if the component ions were BROUGHT together from INFINITY.

Dobereiner, a German scientist, was the first to classify elements into groups based on JOHN DALTON's assertions. He grouped the elements with similar chemical properties into clusters of three called 'Triads'. The distinctive feature of a triad was the atomic mass of the middle element. When elements were arranged in order of their increasing atomic mass, the atomic mass of the middle element was approximately the arithmetic mean of the other two elements of the triad.It MADE a look at elements in terms of groups of elements with similar chemical and physical properties. This EVENTUALLY led to rigorous classification of elements and the modern periodic table of elements, as we now know it, was discovered

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Difference between atoms and MOLECULES are as follows: ... ANSWER PLEASE. 30th August 2016, 5:54 PM.

It is a smallest particle of an ELEMENT: It is a group of two or more atoms combined to...

It cannot be further DIVIDED: It can further

The specific conductance (κ) increases with increase in concentration of solution as the number of ions per UNIT volume increases. * WHEREAS, both the equivalent CONDUCTIVITY and increase with decrease in concentration (i.e. upon DILUTION) since the extent of IONIZATION increases.

It RESULTS in BETTER COATING of ALUMINIUM.

Group 17 elements are highly reactive because their atomic SIZE is small and have more NUCLEAR charge and thus can gain electrons EASILY to BECOME stable

Concentration. Solution concentration = how much solute dissolved in solvent ... Sucrose (common table sugar) in water makes sugarwater .... ex: in CAR radiators we ADD ethylene glycol to raise boiling point for SUMMER ... OSMOTIC pressure calculation ... -1.86 1m GLUCOSE C6H12O6 → 1m C6H12O6 expected amount for 1m.

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The BOND between TWO IONIC COMPOUNDS CALLED ionic bond.....

5H2S + 2KMNO4 + 3H2SO4 → 5S + 2MnSO4 + K2SO4 + 8H2O 

‘O' GROUP elements are not KNOWN at the TIME of Mendeleeff.
Later they were discovered and placed under O group elements.
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ANSWER:

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**FREE living AEROBIC microbes--azotobacter,beijernikia,bacillus

**free living anaerobic microbes--rhodospirillum

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Let W2 g of SOLUTE of molar MASS M2 be dissolved in W1 g of solvent of molar mass M1 . Hence number of
mole of solvent N1 and number of mole of solute n2 in solution.

n1=W1M1n1=W1M1 and  n2=W2M2n2=W2M2 (∵Number of moles (n)=mass of the substancemolar mass of the SUBSTANCE)(∵Number of moles (n)=mass of the substancemolar mass of the substance)

The mole fraction of solute x2 is given by

x2=n2n1+n2x2=n2n1+n2

x2=W2M2W1M1+W2M2x2=W2M2W1M1+W2M2 .....(1)


For a solution of two components A1 and A2 with mole fraction x1 and x2 respectively, if the vapour pressure of pure component A1 is

P01P10 and that of component A2 is p_2^0 The relative LOWERING of vapour pressure is given by,

Δpp10=p01−pp01Δpp01=p10-pp10

Δpp10=p01x2p01Δpp01=p10x2p10

Δpp10=x2Δpp01=x2 .....(2)

Combining equations (1) and (2)

Δpp10=p01−pp01=x2=W2M2W1M1+W2M2Δpp01=p10-pp10=x2=W2M2W1M1+W2M2

For dilute solutions n1 >> n2. Hence n2 may be neglected in comparison with n1 in equation (1) and thus equation (3) becomes

Δpp10=n2n1=W2M2W1M1=W2M1W1M2Δpp01=n2n1=W2M2W1M1=W2M1W1M2

Knowing the masses of non-volatile solute and the solvent in dilute solutions and by determining experimentally vapour pressure of pure solvent and the solution, it is possible to determine molar mass of a non-volatile solute.

Haloarenes are less reactive than haloalkanes TOWARDS nucleophilic substitution reaction because, STABILIZATION by resonance : The electron pair of halogen ATOM in haloarene, is in CONJUGATION with the π ELECTRONS of the benzene ring.

The concept or theory of Scientific MANAGEMENT is about the progress of SCIENCE to substitute the approximation principal or HYPOTHESIS of the awareness and education of workmen

VISCOSITY:-

the LIQUIDS such as water FLOWS in the FORM of layer.

the formation of  layer is aggregated such as the layer at surface have much LOW velocity {due to more weight},as compared to upper one and as so on.

so in between the two layer, a internal force of friction comes into PLAY which retards the relative motion of its upper layer. this opposing force is called viscous force.

and this phenomena of acting as resistance to flow of fluid is termed as viscosity.