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Mixture are constituted by more than one kind of pure form of matter. So it contains various undisturbed particles, because of this reason mixtures do not have FIXED MELTING point or BOILING points

lime water, a good INDICATOR of carbon DIOXIDE, turns into a milky SOLUTION of calcium carbonate when carbon dioxide is PASSED through it ...so lime water used to test for carbon dioxide in LABORATORY......
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Silver is LESS reactive than hydrogenand so placed below hydrogen in the reactivity SERIES. METALS which are less reactive than hydrogen cannot displace hydrogen from acids. This ISWHY silver does not displace H2 when it reacts with dil H2SO4. So, whensilver metal is added to dilute H2SO4, no reaction takes place.

+3 is more STABLE EG Al+3 it will become NEON so it is stable +5 is not stable

Marble is metamorphosed limestone, ie subjected to heat and pressure, the crystals grow and INTERLOCK, forming a stronger rock, more suitable for a building material. Sometimes MINERALS in the original limestone are still visible as swirls of colour in the marble  

Chalk is FORMED in a deep marine environment from the shells of microscopic algae which flourish near the surface, but die and fall to the seafloor. The kind of chalk used in old-style classrooms and lecture theatres scrapes off a thin layer of FINE white dust as they are scraped over the abrasive surface of a "blackboard"



thats the reason

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Copper metal when exposed to AIR TURNS green in colour due to corrosion. When copper vessel is exposed to air in rainy SEASON, the metal reacts with gases and moisture and atmospheric gases to FORM a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal. 
The reaction is as follows:
2Cu + H2O + CO2 + O2 → CU(OH)2 + CuCO3


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Because AIR bubbles occupy volume inside the burette which RESULTS in WRONG results

ANSWER: ETHYLENE GLYCOL

This PUESTION ANSWER is 4

If u are asking for Si Na and I
then Si & I both show multiple oxidation STATE .
Si has +4 &-4 oxidation state. iodine has+7,+5,+3,+1,0,-1.
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Zinc is insoluble in water but reacts READILY with non-oxidising acids, forming zinc (II) and releasing hydrogen. It also DISSOLVES in strong bases. ... Water solubility of zinc compounds varies, with zinc ACETATE, zinc nitrate, zincsulfate, zinc chloride, zinc chlorate and zincperchlorate all readily soluble in water.

Bases are HYDROXIDES of ALKALI earth metals and when they COME in contact with aqueous solution they indicates the change in the color from red litmus to blue.

According to the metal reactivity SERIES, Copper, Silver ,Gold and Platinum are placed in the BOTTOM of the table because the MOSTLY donot react with any other element. only copper and silver reacts if pressurised.Gold, and Platinum do not react with anything they are called noble metals. Silver reacts with only a few elements.so, copper and silver are FOUND in free state.

By compressing gas volume of gas decreases ...
Volume is directly proportional to TEMPERATURE according to Charles law

So by compressing gas volume decreases and PRESSURE increases and temperature decreases ...

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Coal liquefaction is a PROCESS which convert solid coal into LIQUID HYDROCARBON FUEL.

Here is your ANSWER.......

The STRUCTURE .... of S8 is...

We can use ARCHIMEDES principal to determine the PURITY of the METAL.

Explanation:

As with all these PROBLEMS, it is usually assumed that we have a 100⋅g mass of unknown compound, and we work out the molar QUANTITIES:

And THUS moles of carbon≡80⋅g12.011⋅g⋅mol−1=6.66⋅mol.

And thus moles of hydrogen≡20⋅g1.008⋅g⋅mol−1=19.8⋅mol.

We divide the molar quantities thru by the SMALLER molar quantity:

C:6.66⋅mol6.66⋅mol=1

H:19.8⋅mol6.66⋅mol=2.97

And thus the empirical formula = CH3

And we know that the molecular formula is always a multiple of the empirical formula, and thus is terms of mass:

i.e. molecular formula = n×empirical formula

But we have a molecular mass of 30⋅amu

So 30⋅amu = n×(12.01+3×1.01)⋅amu

Clearly, n=2, and the MOLECULAR FORMULA is C2H6.

This is not a realistic problem, as few analysts WOULD perform COMBUSTION on a liquid, and no analyst could perform combustion on a gas.

The NUMBER of CARBON ATOM's in a UNIT cell of DIAMOND are four atom's

No it will form CARBON disulfide CS2 but in excess of the oxygen and some catalyst with certain CONDITIONS CO and SO2 also MAY form

It changes to REDDISH- PURPLE COLOR when dipped in ACID

They have PROPERTY of contenation or ABILITY to COMBINE with own elements.They can easily overlap their ORBITALS due to presence of empty orbitals.

The first IONISATION energy is the energy required to remove the most loosely held electron from one mole of GASEOUS atoms to produce 1 mole of gaseous ions each with a charge of 1+.

This is more EASILY seen in symbol terms.



It is the energy needed to CARRY out this change per mole of X.

Hello dear your answer is in PHOTO


And the CHANGES of FIRE depends upon what you put in fire

more DETAIL in photo

Terry cloth is a cotton fabric with absorbent LOOPS over the ENTIRE fabric surface. It has traditionally been used for towels, but it has many other uses as well. Versatile terry cloth can be used to make bathrobes and SWIMSUIT cover-ups. It is ideal for a comfyhooded towel-robe to WRAP baby up after a bath.

A REACTION which PROCEEDS with evolution of heat is CALLED EXOTHERMIC reaction.

342.3 g of SUCROSE have 22G of hydrogen
1 gr of sucrose will have =( 22/342.3)
So, 25.6 g will have =(22/342.3)×25.6 = 1.64 ATOMS

The ANSWER is 0.0480285

MATLAB

pori hawa
78% Nitrogen se BANI hai
21% oxygen se
aur baki SAARI GASES se





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Propionitrile, also KNOWN as ETHYL cyanide and PROPANENITRILE, is an organic compound with the formula CH3CH2CN. It is a simple ALIPHATIC nitrile. The compound is a colourless, water-soluble LIQUID. It is used as a solvent and a precursor to other organic compounds.[7]

Propionitrile







1.505 X 10^23/6.023 x 10^23 = 0.25 MOLES

To PROTECT them from RANCIDITY

CH3CH2OH+KCN →CH3-CH2-c=-N
Ethanol

CH3CH2-C(TRIPLE BOND with)N which is propanenitrile
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Weight on earth be X
so , weight on MOON will be 1/6 X
Put the VALUE of X as your Freinds weight & you will GET the answer

Identify the hazard by carrying out a workplace risk assessment;
determine how EMPLOYEES might be at risk;
EVALUATE the risks;
record and REVIEW hazards at least annually, or earlier if SOMETHING changes.

The average kinetic energy of a gasparticle is directly proportional to the temperature. An increase in temperature increases the speed in which the GAS MOLECULES MOVE. Allgases at a given temperature have the same average kinetic energy. Lighter gas molecules move faster than HEAVIER molecules

The average kinetic energy of a gas particle is directly proportional to the temperature. An increase in temperature increases the speed in which the gas molecules move. All gases at a given temperature have the same average kinetic energy. Lighter gas molecules move faster than heavier molecules

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