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P = density * g * height

740 torr = 98630 Pa

98630 Pa = 6095 kg/m3 * 9.8 m/s2 * Height (m)

Height = 1.65 m

Solubility of potassium nitrate at313K = 62/100

100 g of water contains potassium nitrate = 62 g

50 g of water contains potassium nitrate = 62/100 X 50 = 31g

Thus, 31 g potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 g of water at 313 K.

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please give question in English.

Handle of metallic kettle is covered with strips of cane because when kettle is heated, the heat does not pass through strips of cane. The strips of cane are bad conductor of heat and we may hold the handle with our bare hands.

because heat doesn't pass through plastics it is also known as thermo plastics

you are wrong

what is meant by unified atomic mass

In two dimensional square close−packed layer, a molecule touches four neighbor atoms. Therefore, 4 is the two dimensional coordination number of a molecule in square close packed layerlike please

Thus the empirical formula = CHO2The Empirical formula mass = 12 + 1 +32 = 45n = Molecular mass / Empirical formula mass = 90 /45 =2Molecular formula = Empirical formula x n = CHO​2x 2 = C2H2O4

In graphite, each carbon atom is bonded to three other carbon atoms in the same plane giving ahexagonalarray. One of these bonds is a double-bond, and thus the valency of carbon is satisfied. Graphite structure is formed by thehexagonalarrays being placed in layers one above the other

1 mole of Calcium carbonate forms = 1 mole of calcium chloride

No. of moles of Calcium carbonate = 2.5/100 = 0.025 moles

0.025 moles of calcium carbonate will produce = 0.025 moles of calcium chloride.

Mass of calcium chloride = molar mass x no. of moles = 110.98 x 0.025 = 2.7745 g

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Third answer : (c) ethocy propane

b) glutaraldehyde c)ethoxypropane

second option... because bao2 is a peroxide any peroxide on reaction with acids produces hydrogen gas

second option... because bao2 is a peroxide any peroxide on reaction with acids produces hydrogen gas

For balancing an equation: no. of molecules of reactant should be equal to no. of molecules of product. 2HNO3 + Ca(OH)2 = Ca(NO3)2 +2H2O.

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This is an acid (HNO3) base Ca(OH)2 reaction ,so the products will always be a salt + water.

The balanced equation is 2HNO3 +Ca(OH)2 ==> Ca(NO3)2 + 2H2O

Carbon atoms forms compounds with different type arrangement, such as long chain, branched chain and cyclic chain structures.

Structural Isomers

Hydrocarbons having same molecular formula but different structural formula are called Structural Isomers.

Example:

Butane:

Molecular formula of hydrocarbon having four carbon atoms = C4H6

NAOH + Zn = Na2ZnO2 + H2This hydrogen gas can be tested by putting matchstick over the solution. The burning matchstick will extinguish by a pop sound.

Then, when zn metal reacts with a dilute strong acid such as hcl, it will give zinc chloride and hydrogen gas again. Hcl + Zn= ZnCl2 + H2

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a)The value ofpHofmilkdecreases, when it turns into curd. Curdisacidic in nature. Because an acidic substancehasless value ofpH. ... Answer: As thismilk is slightlymorealkalinethan other, therefore, acid produced to set into curdwillbe neutralized by baking soda added by milkman.

b)He shifts the pH of the freshmilkfrom 6 to alkaline so that in basic form itwillnot spoil easily. Thismilk takesalong time to set as curdbecause the lactic acid produced reacts with the baking soda

Addition of HBr to propene is an example of an electrophilic substitution reaction.

Hydrogen bromide provides an electrophile, H+. This electrophile attacks the double bond to form 1° and 2° carbocations as shown:

Secondary carbocations areproduct stable than primary carbocations. Hence, the former predominates since it will form at a faster rate. Thus, in the next step, Br- attacks the carbocation to form 2 - bromopropane as the major product.

This reaction follows Markovnikov's rule where the negative part of the addendum is attached to the carbon atom having a lesser number of hydrogen atoms.

In the presence of benzoyl peroxide, an addition reaction takes place anti to Markovnikov's rule. The reaction follows a free radical chain mechanism as:

Secondary free radicals are more stable than primary radicals. Hence, the former predominates since it forms at a faster rate. Thus, 1 - bromopropane is obtained as the major product.

In the presence of peroxide, Br free radical acts as an electrophile. Hence, two different products are obtained on addition of HBr to propene in the absence and presence of peroxide.

Chemical formula of Bleaching Powder is CaOCl2and its Chemical name is Calcium Oxychloride.It is Prepared by Chlorine gas over dry slaked lime. Generally this method is used in large scale preparation of bleaching powder.Ca(OH)2+ Cl2→ CaOCl2+ H2O

Its simple its aluminum... because onyl aluminum and zinc are the metals which react both with acids and bases and according to the formula M2O3, only aluminium is the answer..

Smog is a type of air pollution caused by tiny particles in the air. The word comes from a mixture of the words smoke and fog.

When carbon dioxide is passed through lime water which is a diluted solution of Ca(OH) 2, it turns milky due to the formation of calcium carbonate which is CaCO3.

The reaction is like this:

Ca(OH) 2 + CO2 → CaCO3 + H2O

If you pay a little more attention, you will be able to observe that it is a neutralization reaction, where base is Ca(OH)2 and acid is H2CO3 and a salt CaCO3 and H2O are formed.

So, actually the above reaction is a short form of actual reaction.

Actually CO2 is no more CO2 after dissolving in water, it becomes H2CO3 via addition reaction as shown :

CO2+H2O→ H2CO3

Now, this CaCO3 is insoluble in water which is the reason behind the milkiness of solution.

However if excess carbon dioxide is passed, the milkiness disappears, think about it… milkiness was due to CaCO3 and now the milkiness is disappeared… this must mean that CaCO3 is no more left and git converted into something.

That something is actually calcium bicarbonate which is soluble in water and hence the solution becomes clear.

The reaction is as follows :

CO2+H2O→ H2CO3

CaCO3 + H2CO3 → Ca(HCO3)2

This is because…

Carbonate + carbonic acid gives 2 bicarbonates

CO3 2- + H2CO3 → 2 HCO3-

This is due to proton transfer.

So… H2CO3 gives H+(acting as acid) and CO3 2- accepts it(acting as a base).

This clearly means that, it is an acid base reaction in which no water is formed(coz its proton transfer)

Hope it helps.

Photochemical reaction, a chemical reactioninitiated by the absorption of energy in the form of light. The consequence of molecules' absorbing light is the creation of transient excited states whose chemical and physical properties differ greatly from the original molecules.

Examples:

Photosynthesis: plants use solar energy to convert carbon dioxide and water into glucose and oxygen. Human formation of vitamin D by exposure to sunlight.

Bioluminescence: e.g. In fireflies, an enzyme in the abdomen catalyzes areactionthat produced light.

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Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in mass number. All isotopes of a given element have the same number of protons in each atom.Carbon 12andCarbon 14are both isotopes ofcarbon, one with 6neutronsand one with 8neutrons(both with 6protons).Carbon-12is astable isotope, whilecarbon-14is a radioactive isotope (radioisotope).Uranium-235anduranium-238occur naturally in the Earth's crust.

Atitrationis a technique where a solution of known concentration is used to determine the concentration of an unknown solution. Typically, the titrant (the know solution) is added from a buret to a known quantity of the analyte (the unknown solution) until the reaction is complete.

Thanku very much

Fossilsare remains or impressions of organisms that lived in the remote past.Fossilsprovide the evidence that the present animal have originated from previously existing ones through theprocessof continuousevolution.

Metalloids have properties in between those of the metals and non-metals and are semiconductors (whereas metals are conductors and nonmetals are not conductors) and used extensively in circuitry (like computer chips).

They are all solids at room temperature, not quite as malleable as metals but not quite as brittle as nonmetals. They can be shiny (have luster) or not whereas all metal are shiny.

metals are hard and strong

Zn is preferred to metallic Zn in the preparation of hydrogen because granulated zinc has more surface area exposed to the acid, so the reaction can occur more rapidly.

Noble metals like Gold (Au),Silver(Ag),Platinum(Pt) etc...

Nobel metals like gold,platinum, etc we found in elemental form or free state in nature.

i) oscillatingii) increasesiii) trigonal bipyramidal

Lead and Mercury .

Because some chemicals and medicines decompose in the presence of light .So in order to protect it , they are stored in coloured bottles. This is because some chemicals are photosensitive meaning that they break down when exposed to light.

1. Dark coloured bottles interrupt the path of light such that light cannot reach silver chloride in the bottles and its decomposition is prevented. It is known that silver chloride decomposes to silver and chlorine in the presence of light.

2. When food is damaged in such a way that it becomes unfit for consumption by human beings is called rancidity.

When edible oils are stored for a longer period of time then oxidation occurs. There is carbon-carbon double bonds in fats and oils which are broken down by the oxygen in the free space or atmosphere.

As a result, after a long period of time fats and oils become rancid.

why do silver ornaments loose their shine when kept for some time

Some liquid medicines are kept in dark coloured bottles.this is because some liquid medicines can react to the light but when they are kept in coloured bottles these help to prevent the medicines to come in contact with the light. they act as a filter and this prevent the reactions with can take place between the medicines when they are exposed to light .

Hope it helps

it is kept in dark because to avoid the effect of sunlight...

from the observation , we can see that Rate doesn't depends on [A] and depends upon [B]³ as when [B] is twice R → 2³ → 8 times

so, option a is correct.

Average Rate is the rate of reaction calculated for a long time interval. It is defined as the amount of change/time taken. R=Δ[A]/Δt.

Instantaneous Rate is the rate calculated at any instant during the reaction. It is defined as the differential of conc.(or press.,etc.) with respect to time. R= d[A]/dt.

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