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by the centrifugation machine

Different between solid liquid gas

Atomic radiusof the elements generally decreases from left to the right in aperiodbecause on moving from left to right in aperiod the nuclear charge gradually increases by one unit & one electron is also added in the electron shell.

Due to this the electrons get attracted more & more towards the nucleus.

Natural rubber, also called India rubber or caoutchouc, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds, plus water. Malaysia and Indonesia are two of the leading rubber producers

Natural rubber is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree. Natural rubber is from themonomer isoprene(2-methyl-1,3-butadiene), which is aconjugateddiene hydrocarbon.

These are the elastomers which are obtained naturally. It is made up of solids particles suspended in milky white liquid, called latex that drips from the bark of tropical and subtropical trees. This latex rubber is mainly found in the countries like Brazil, India, Indonesia, Malaysia and Sri Lanka. It is made by the polymerization of isoprene (2 methyl-1, 3-butadiene) which has a chemical formula (C5H8)nand it is known as cis- 1, 4- polyisoprene. In simple words, we can say that they are made by loosely joining the monomers of isoprene (C5H8) in the form of a long tangled chain.

Natural Rubber is an elastic substance obtained from the latex sap of trees, especially those trees which belong to the genera Hevea and Ficus. Technically speaking, natural rubber is an elastomer or an elastic hydrocarbon polymer. Natural rubber is one of the types of rubber that also include vulcanized rubber which is finished into a variety of rubber products. Natural rubber is also known by the names of India rubber, gum elastic, and caoutchouc.

= 5*100/(5+18)= 500/23= 21.73

The volume of H2 and O2 , will be in ratio 2:1

so, volume of H2 = 2/3*(16.8 = 11.2L

moles of H2 = 11.2/22.4 = 0.5 moles

now in the reaction , moles of H2 is same as that of the moles of H2O electrolysed

so, moles of H2O = 0.5 and mass = 0.5*18 = 9g

but how can calculate the volume of hydrogen?

in 1 mole the volume of any gas is 22.4L

and hydrogen's volume is two third of 16.8L = 11.2Lfrom the reaction H2O → H2 +1/2O2

so if ,22.4L is one mole.. then 11.2 L will be ??

∆H=[2(∆H of C=C +2∆H of C-H)+5∆H of O=O]-[4×2∆H of C=O +2×2∆H of O-H]

∆H=[2(q+2p)+5r]-8s-4t∆H=2q+4p+5r-8s-4t

लैन्थनाइड(Lanthanide)परमाणु क्रमांक५७ से ७१ तक के १५धातुरासायनिक तत्वोंका एक समूह है। यह पन्द्रह और इनसे रासायनिक रूप से मिलते-जुलतेस्कैण्डियमऔरइत्रियमतत्व मिलाकरदुर्लभ मृदा तत्व(rare earth elements) बुलाये जाते हैं

The atom is the smallest object that retains the properties of an element. Atoms are composed of electrons and a nucleus. The nucleus contains protons and neutrons. All atoms are electrically neutral, because every atom has an equal number of electrons and protons.

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Atom is a very smallest particle which takes place in a chemical reaction.

atom is the smallest fundamental building blocks of matter which cannot be further divisible . It is the smallest particle of an element which takes place through chemical reaction.

Smallest particle of matter

Atoms are the building blocks of matter.

Atoms can be further be divided into protons, neutrons and electrons.

atom is a smallest particle which is consist of proton neutron and electron. the charge of it is zero

two examples of double displacement reaction

Nucleotides are the building blocks of nucleic acids; they are composed of three subunit molecules: a nitrogenous base, a five-carbon sugar, and at least one phosphate group. A nucleoside is a nitrogenous base and a 5-carbon sugar.

I-> I > I+- Anions are more in size and cations are less in size.

CO2 has --- 6+8+8 electrons = 22 electrons

so, X+ , Y2+ and Z- should also have 22 electrons

=> proton of X = 22+1( +ve charge) = 23=> proton of Y = 22+ 2( +2 ve charge) =24=> proton of z = 22-1 ( -ve charge) =21

so, correct order is Y2+ > X+ > Z-option 3

Answer:-

(a) Each of the given species (ions) has the same number of electrons (10 electrons). Hence, the given species are isoelectronic, i.eN3- has 7+3 = 10 electronsO2- has 8+2= 10 electronsF- has 9+1 = 10 electronsNa+ has 11-1 = 10 electronsMg2+ has 12-2 = 10 electronsAl3+ has 13-3= 10 electrons

(b) The ionic radii of isoelectronic species increases with a decrease in the magnitudes of nuclear charge.The arrangement of the given species in order of their increasing nuclear charge is as follows:N3– < O2– < F– < Na+ < Mg2+ < Al3+Nuclear charge = +7 +8 +9 +11 +12 +13Therefore, the arrangement of the given species in order of their increasing ionic radii is as follows:Al3+ < Mg2+ < Na+ < F– < O2– < N3–

very nice handwriting

1)A mirror is a reflective surface that does not allow the passage of light and instead bounces it off, thus producing an image. The most common mirrors are flat and called plane mirrors. These mirrors are made by putting a thin layer of silver nitrate or aluminium behind a flat piece ofglass

Law of reflection. the principle that when a ray of light, radar pulse, or the like, isreflectedfrom a smooth surface the angle ofreflectionis equal to the angle of incidence, and the incident ray, thereflectedray, and the normal to the surface at the point of incidence all lie in the same plane.

U=-30cm f= -15cm 1/f=1/v-1/u1/v=1/f+1/uon substituting v=-10cmm=v/um=-10/-30m=1/3=.33so the magnification is positive so it is a virtual erect image .m isless than 1 so the image is diminished .and v is negative so the image is formed on the same side of the lens

mass of 1 L water → 1kg = 1000gm

so, no of moles = 1000/18 = 55.5 moles

According to ideal gas equation

PV = nRT

P: Pressure; V: Volume; n: Number of moles; R: Gas constant; T: Temperature

Volume, V is given 1 litre. Therefore

P = nRT

n = P/RT

The full form of O.P.V isOral Polio Vaccine

FormulaWill beCH4for thisthanks

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purple color is produced on pH paper

purple colour is produced on pH paper by NaOH

Cyclohexaneis acycloalkanewith themolecular formulaC6H12

nice bro you reply this answer from searching internet

Fiber is one kind of carbohydrate. It is sometimes called roughage or bulk. Fiber is the part of plant foods that our bodies do not break down during digestion. Because fiber isn't digested, it doesn't give us calories. Foods that contain a lot of fiber may also contain other types of carbohydrates like starch or sugar. While we do not get calories from the fiber in these foods, we do get calories from the sugars and starches they contain.

Fiber is important for keeping the digestive tract working smoothly. Since we do not digest it, the fiber in food passes into the intestine and absorbs water. The undigested fiber creates "bulk" so the muscles in the intestine can push waste out of the body. Eating enough fiber helps prevent constipation. It may also reduce the risk of getting colon cancer. Some fibers can help lower blood cholesterol.

One of the main benefits of eatingroughageis that it helps to regulate your digestion. Insoluble fiber provides bulk in your intestines and helps to keep food moving through your digestive tract. Insoluble fiber absorbs water and swells into a gel that helps to keep bowel movements soft and easy to pass.

One of the main benefits of eatingroughageis that it helps to regulate your digestion. Insoluble fiber provides bulk in your intestines and helps to keep food moving through your digestive tract. Insoluble fiber absorbs water and swells into a gel that helps to keep bowel movements soft and easy to pass.

roughage is essential for us because works kike a sweeper for our hollow organs. it clears all the junk from our hollow digestive organs

Answer :- Roughage is important for us to perform certain activities in our daily lives.During viral fever doctors tell us to drink more cocunut water.This is because it contains many hydrating moleucules which hydrates water into our body.So we consider roughage is very important as cocunut water is also a roughage.

Above answers are absolutely correct..

roughage is essential for us because it clears all junk material from our hollow digestive organs.

SummaryRoughagehas numerous health benefits. It helps improve digestion and promotes gut health. It may also improve certain risk factors for heart disease and help you manage your weight and blood sugar.

Roughage, or fiber, has long been recommended to help with digestive issues like constipation, but it also plays many otherimportantroles in your body. For example, theroughagein plant foods can promote optimal gut health, help you manage your weight, and even reduce your risk of heart disease.

a. electronic configuration of chlorine : 1s22s22p63s23p5b. fig. gives electron dot structure of Cl2 molecule

flurobenzene as free radical of flourine is highly unstable hence direct halogenation is not possible.

3,4-lithium and berelliyumalso atomic no3-1s22s1-is atomic config for s block4-1s22s2-is atomic config for s block

When it reacts with hot water it forms magnesium hydroxide and hydrogen .The hydrogen gas evolved doesn't catch fire because the heat evolved is very low . But it forms bubbles and stick to the surface of magnesium and thus as a result magnesium starts floating on water due to the hydrogen gas

NaCl or CaCl2 is used to clear snow from the roads because these solids causes a depression in freezing point of the water and hence it is difficult for the water to freeze. ( You might have studied this in the chapter solutions, look for colligative properties)

When blood cells are placed in water they burst because they constantly take water in due to endosmosis and since they lack a cell wall these cells burst.

Human beings exhibit male heterogamy. In humans, males (XY) produce two different types of gametes, X and Y. The human female (XX) produces only one type of gametes containing X chromosomes. The sex of the baby is determined by the type of male gamete that fuses with the female gamete. If the fertilizing sperm contains X chromosome, then the baby produced will be a girl and if the fertilizing sperm contains Y chromosome, then the baby produced will be a boy. Hence, it is a matter of chance that determines the sex of a baby. There is an equal probability of the fertilizing sperm haveup an X or Y chromosome. Thus, it is the genetic make up of the sperm that determines the sex of the baby.

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4x²-4a²x+(a⁴-b⁴)=0or, 4x²-2{(a²+b²)+(a²-b²)}x+(a²+b²)(a²-b²)=0or, 4x²-2(a²+b²)x-2(a²-b²)x+(a²+b²)(a²-b²)=0or, 2x{2x-(a²+b²)}-(a²-b²){2x-(a²+b²)}=0or, {2x-(a²+b²)}{2x-(a²-b²)}=0Either, 2x-(a²+b²)=0or, 2x=a²+b²or, x=(a²+b²)/2Or, 2x-(a²-b²)=0or, 2x=a²-b²or, x=(a²-b²)/2∴, x=(a²+b²)/2, (a²-b²)/2 Ans