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1;a=293-273=20°c b;470-273=197°c2;a=25+273=298°c b=373+273=646°c5;=a

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a) because water in room temperature can flow thus it is a liquidb) because it is hard and stiff in room temperaturec) diffusion of the particles take place in the air which carry the fragrance to several meters.

a) because the room temperature is not so high or even below its i.e.water melting point to overcome the force of attraction between their particles

b) it is solid at room temperature bcz the room temp. is not very much which overcome the force of attraction between the particles of solid

c)bcz the perfume is in liquid state when kept in perfume bottle bcz of high pressure and it is compressed very much to change its state and when the pressure releases it change into gaseous state and diffuse very fast in the gas that's why we can smell the perfume even when we are sitting several meters away from that

Interstitial solution

Given :Mass number of element is 35Number of neutrons= 18

Formula to find number of protons: Mass number = number of protons + number of neutrons.35=× +18×=35 - 18X=17.Number of protons =17 and number of electrons also will be 17 as atom is electrically neutral.

Hence Element is chlorine

Electronic configuraton:1s2 2s2 2p6 3s2 3p5

Group number= 17Period number =3Valency =1

A is quick lime (Cao)reaction= quick lime + water =slaked lime ...

CaO+H2O =Ca(OH)2

question purra dikhayoo

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Both are refractive conditions, meaning that they are problems related to how the light is focused as it enters the eye.

Ideally, as light enters the eye, without any additional effort, the light would be perfectly focused onto the inside lining of the eye which detects the light, called the retina. The brain would then see a clear view of the world. This person would not need glasses for the distance.

Nearsighted means that with your natural uncorrected vision, you can see closer or “nearer” and further out gets blurry.

Nearsightedness or myopia is a refractive defect of the eye lens in which the image is formed in front of the retina not on it.

This defect can have people seeing closer objects clearly while distant ones are blurred.

Farsighted is simply the opposite. Farsightedness or hypermetropia or hyperopia is a defect of vision in which closer objects appear to be blurred.

It occurs because the eyeball is too short, the lens has incorrect curvature or the cornea is flat.

Molecular mass of the Ferric oxide = 160 g/mol.Molecular mass of the Aluminium Oxide = 102 g/mol.

Reaction is⇒2Al + Fe₂O₃ ----------→ Al₂O₃ + 3Fe.

(i). 54 g of the Al produces 102 g of the Aluminium Oxide.∴1 g of the Al produces 102/54 g of the Aluminium Oxide.∴ 324 grams of the Al produces (102/54)× 324 g of the Aluminium Oxide.= 612 grams.

Hence, the mass of the Aluminium Oxide is 62 grams.

(ii). 2× 27 grams of the aluminum reacts with the 160 grams of the Ferric Oxide.∴ 1 grams of the Al reacts with the 160/54 g of the Ferric Oxide.∴ 324 grams of the Al reacts with the (160/54)× 324 g = 960 g of the Ferric Oxide.

Now, Whole mass of the Ferric Oxide present will not be consumed since it is in excess & Aluminium is the limiting reactant.

∴ Mass of the Ferric Oxide left = 1120 - 960= 160 g.

Hence, the mass of the Ferric oxide left unreacted will be 160 g.

1) 1: 2 is the correct answer

Answer:3)3:7Explanation:

The equation for the reaction of oxygen and chromium is as follows:

4Cr(s)+3O₂(g)→2Cr₂O₃(s)

We can take a sample of the 2 where we have 13g of Cr and 12 g of O to have a mass ratio of 13:12, for the purpose of calculation.

In the first reaction we will use a mass of oxygen of 12 g.

The reaction of oxygen and Chromium to from dichromate (CrO₇) is:

2Cr + 7O₂ ---------------->2CrO₇

Mole ratio is 2:7:2

In this case the same amount, 13 g of Cr will be used in this equation.

Calculate the moles of Cr (molar mass = 52)

moles = mass/molar mass = 13/52 = 0.25 molesmole ratio between Cr:O₇ is 2:7 , meaning the moles of oxygen will be ( 0.25 × 7/2 = 0.875) moles

Therefore the moles of oxygen are 0.875, calculate the mass using this mole value

mass = moles× molar mass (molar mass of O₂ = 32)

= 0.875 × 28 = 28 gThe mass of oxygen used by same mass, 13 g of chromium to give Cr₂O₇ is 28g

The ratio of the oxygen in the 2 equations then is:

12 g : 28 g (simplify)

The ratio therefore is 3:7

strong acid , make weak conjugate base.. so, HSO4- will be weakest base among all

so, order would be

OH- > NH3 > H2O > HSO4-

element I - alkali metal element II - alkaline earth metalelement III - non metal

element I - alkali metal element II - alkaline earth metalelement III - non metal

To find the ionisation energy of a hydrogen like atom with one electron we use the formula

IE =13.6Z²/n²eV

Where Z is atomic number and n is the shell number.

In this case Z is 2 and 3 and n is 1( because hydrogen is having n=1)

so IE He+ = 13.6*(2)² = 54.4 eV.So IE Li²+ = 13.6×9 = 122.4 eV.

pls answer next one also

Option D)Chloro Fluoro Carbon is correct.

n=1 is the orbit number of He. He has configuration of 1s2, meaning that both 2 electrons are in 1st orbit. 2nd Ionization energy refers to removal of 2nd electron, or removal of only electron of He+ ion, in this case. Z refers to the atomic number of the species. For He, Z = 2.

The enthalpies of all elements in their standard States is zero.

no of neutrons= atomic mass- no of protons =235-92 =143

The boiling point decrease.

Boiling point in alkanes is compared by the Vanderwaal Forces. Vanderwaal force increases when there is more surface area in contact between two molecules. When branching occurs the surface area decreases thereby decreasing the vanderwaal forces and decrease the BOILING POINT.

the boiling point decrease

Alkanes are organic compounds that consist entirely of single-bonded carbon and hydrogen atoms and lack any other functional groups. Alkanes have the general formula CnH2n+2 and can be subdivided into the following three groups: the linear straight-chain alkanes, branched alkanes, and cycloalkanes. Alkanes are also saturated hydrocarbons. Alkanes are the simplest and least reactive hydrocarbon species containing only carbons and hydrogens. They are commercially very important, being the principal constituent of gasoline and lubricating oils and are extensively employed in organic chemistry; though the role of pure alkanes (such as hexanes) is delegated mostly to solvents.

Alkanes: Halogenation

The reaction of a halogen with an alkane in the presence of ultraviolet (UV) light or heat leads to the formation ofa haloalkane (alkyl halide).An example is the chlorination of methane.

Halogenation. The reaction of a halogen with analkanein the presence of ultraviolet (UV) light or heat leads to the formation of a haloalkane (alkyl halide). An example is the chlorination of methane.

The reaction of a halogen with analkanein the presence of ultraviolet (UV) light or heat leads to the formation of a haloalkane (alkyl halide). An example is the chlorination of methane.

the carbon chain is 9 carbon atoms hence nonane3,6-methyl,5-ethyl nonane

The acid is ethanoic acid-CH3COOHThe alcohol is propyl alcohol -C3H7OH

The ester IUPAC name is propyl ethanoate and common name is propyl acetate CH3COOC3H7

The process is esterification.

Propane's condensed structural formula is CH3 CH2 CH3. The prefix pro- means three and corresponds to three the three carbon atoms in propane's formula. Each carbon has four bonds. So, the first carbon and last carbon have three bonds to hydrogen atoms and one bond to an adjacent carbon. The middle carbon is bound to two carbons, so it only has bonds to two hydrogen atoms.

2HNO3+Ca(OH)2=Ca(No3)2+2H2O

2Naoh and other side is 2H2O

on product side 2HCL

in (c) they already balanced

2Bacl2+2H2so4=2Baso4+4Hcl

x=-1/3 , x=1/2 ,0000000⁰0000000000000

6x² - x - 1= 6x² - 3x + 2x - 1= 3x ( 2x - 1 ) + 1 ( 2x - 1 )= ( 2x - 1 ) ( 3x + 1 )

If 6x² - x - 1 = 0(2x-1)(3x+1) = 02x - 1 = 0 OR 3x + 1 = 02x = 1 OR 3x = -1x = 1/2 OR x = -1/3

The zeroes of 6x² - x - 1 are 1/2 and -1/3.

x=2,-3 is right answer hoga

Answer is -1/3 and 1/2 .

6x²-x-1= 6x²-3x+2x-1=3x(2x-1) +1(2x-1)=(2x-1) (3x+1)•2x-1=0 2x=1 x=½•3x+1=0 3x=-1 x=-⅓

6x^- x -1= 6x^ - 3x +2x -1 3x(2x-1) +1(2x-1) (2x-1) (3x-1)

About 71 percent of theEarth'ssurface iswater-covered, and the oceans hold about 96.5 percent of allEarth's water.Wateralso exists in the air aswatervapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog.

thanks

C5H4N4

Thnks for clearing my doubt

the force acting in horizontal direction is = 50cos∅

and ∅ = 37°

so, Fh = 50*(4/5) = 40N

and the vertical component of force will try to reduce the normal reaction

so, Normal reaction will be = mg -Fv = 100-(50sin37) = 100-(50*3/5) = 70N

now frictional force is μN = 1/3*(70) = 70/3 N

so, equation along x direction is

Net force = mass*a

=> a*(10) = 40-70/3 = 50/3 => a =(5/3) m/s².

option D should be the answer.

27°C = 300 K927°C = 1200 K

Average velocity ∝ sqrt(Absolute Temperature)

v1 / v2 = sqrt(T1 / T2)0.3 / v = sqrt(300 / 1200)0.3 / v = 1 / 2v = 0.6 m/s

Average velocity at 927°C is 0.6 m/s

Number of moles in 10 g of Nitrogen(N2) = 10g/28g/mol = 0.3571 mole = (0.3571mole x 6.022 x 10²³molecules/mole) = 2.15 x 1023molecules of N₂Number of moles in 10g of ammonia( NH3) = 10g/17g/mol = 0.5882 mole = (0.5882mole x 6.022 x 10²³molecules/mole) = 3.54 x 1023molecules of NH₃

option 3 is the answer

Since neutrons have no electrical charge, they do not affect the chemical behavior. What Dalton didn't know is that there can bedifferentnumbers of neutrons inatoms of the same element— that is, theatomsare not allidentical.Atoms of the same elementwithdifferentnumbers of neutrons are called isotopes

distance travelled in nth second is

= u + a/2*(2n-1)= 0 + 8/2*(2*5-1)= 4*9 = 36m

The solution of dilute HCl, dilute HNO3, ZnCl2 and H2O can be kept in the container made of copper. Since copper is a less reactive metal and is placed below the hydrogen in activity series. Hence it does not react with HCl, HNO3 ZnCl2 and H2O. While aluminium is highly reactive metal and can reacts with these solutions.Thus container made of copper is suitable to keep the given solutions.

The solution of dilute HCl, dilute HNO3, ZnCl2and H2O can be kept in the container made of copper. Since copper is a less reactive metal and is placed below the hydrogen in activity series. Hence it does not react with HCl, HNO3ZnCl2and H2O. While aluminium is highly reactive metal and can reacts with these solutions.Thus container made of copper is suitable to keep the given solutions.

The LPS lamp was the first sodium lamp to be developed. It is known by its signature monochromatic yellow color. It is mostly used in Europe since it did not appeal in other markets due to its poor CRI or color rendering. It is among the most efficient lamps in the world because it uses all the current it gets to create light at the most sensitive color (frequency) to the human eye. An incandescent lamp in contrast creates light at all frequencies from Infrared (non-visible) to UV at the other end of the spectrum. The energy used to make non-visible light is a waste of energy since it does not help do the principle job of an electric light. The LPS lamp is also called a SOX lamp (SO for sodium)