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Law of Conservation of MassIt states thatmatter can neither be created nor destroyed.Law of Definite ProportionsIt stated thata given compound always contains exactly the same proportion of elements by weight.Example : Oxygen and hydrogen in water always bear ratio of 16:2 or 8:1 by massLaw of Multiple ProportionsAccording to this law,if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers.ExampleHydrogen + Oxygen → Water2g 16g 18gHydrogen + Oxygen → Hydrogen Peroxide2g 32g 34gHere, the masses of oxygen (i.e. 16 g and 32 g) which combine with a fixed mass of hydrogen (2g) bear a simple ratio, i.e. 16:32 or 1: 2.

A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.

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In simple terms, thislawstates that matter can neither be created nor destroyed. In other words, the total mass, that is, the sum of mass of reacting mixture and the products formed remains constant.

According to this law,“Matter can neither be created nor destroyed in a chemical reaction”.

For any chemical change total mass of active reactants are always equal to the mass of the product formed.

It is a derivation of Dalton’s atomic theory ‘atoms neither created nor destroyed’.

Total masses of reactants = Total masses of products + Masses of unreacted reactants.

1.Law of Conservation of Mass

In simple terms, this law states that matter can neither be created nor destroyed. In other words, the total mass, that is, the sum of mass of reacting mixture and the products formed remains constant. Antoine Lavoisier gave this law in the year 1789 based on the data he obtained after carefully studying numerouscombustionreactions.

2.Law of Definite Proportions

Joseph Proust, a French chemist stated that the proportion of elements by weight in a given compound will always remain exactly the same. In simple terms we can say that, irrespective of its source, origin or its quantity, the percent composition of elements by weight in a given compound will always remain the same.

3.Law of Multiple Proportions

This law states that if two elements combine to form more than one compound, the masses of these elements in the reaction are in the ratio of small whole numbers. This law was given by Dalton in the year 1803.

4. Gay Lussac’s Law of Gaseous Volumes

In 1808, Gay Lussac gave this law based on his observations. This law states that when gases are produced or combine in a chemical reaction, they do so in simple ratio by volume given that all the gases are at same temperature and pressure. This law can be considered as another form of law of definite proportions. The only difference between these two laws of chemical combination is thatGay Lussac’s Lawis stated with respect to volume while law of definite proportions is stated with respect to mass.

5.Avogadro’s Law

Avogadro proposed this law in the year 1811. It stated that under same conditions of temperature and pressure, equal volume of all the gases contain equal number of molecules. This implies that 2 litres of hydrogen will have the same number of molecules as 2 litres of oxygen given that both the gases are at same temperature and pressure.

The laws of chemical combination discussed above form the base for quantitative study of chemical reactions. Join Byju’s to learn more about the laws of chemical combination in themost simplified ways.

At the foot of the mountain. Ignoring the likelihood of freezing, bringing a liquid up through a straw requires air pressure to push the liquid into and up the straw. The liquid is not pulled up the straw by your mouth, but pushed up by the now greater outside air pressure. Thus the greater the air pressure (which it would be at the foot of Everest), the easier it is to drink through a straw

5-methyl -N,N-dimethyl-hexane-amide

Principle:

Impulse turbine works on the basic principle of impulse. When the jet of water strikes at the turbine blade with full of its speed, it generates a large force which used to rotate the turbine. The force is depends on the time interval and velocity of jet strikes the blades. This turbine used to rotate the generator, which produces electric power.

Construction:

Blades:

The number of blades is situated over the rotary. They are concave in shape. The water jet strikes at the blades and change the direction of it. The force exerted on blades depends upon amount of change in direction of jet. So the blades are generally concave in shape.

Rotor:

Rotor which is also known as wheel is situated on the shaft. All blades are pined into the rotor. The force exerted on blades passes to the rotor which further rotates the shaft.

Nozzle:

A nozzle play main role of generating power from impulse turbine. It is a diverging nozzle which converts all pressure energy of water into kinetic energy and forms the water jet. This high speed water strikes the blades and rotates it.

Casing:

Casing is the outside are which prevent the turbine form atmosphere. The main function of casing is to prevent discharge the water from vanes to tail race. There is no change in pressure of water from nozzle to tail race so this turbine works at atmospheric pressure.

Braking nozzle:

A nozzle is provided in opposite direction of main nozzle. It is used to slow down or stop the wheel.

Working:

As we discussed impulse turbine works on basic principle of impulse. Its working can be describe in following points.

*High pressure water flow form dam (high head) to nozzle (low head).

*This water flows through divergent nozzle where it’s all pressure energychange into kinetic energy. It forms a water jet.

*The water jet strikes the blade at high speed which rotates the rotor.

* It transfers all kinetic energy of water to the rotor, which further use to rotate the generator.

*After transferring energy, water flows to the tail race.

*This process run continuously until sufficient power generates.For better understanding watch the video given below on working of impulse turbine.

TheKjeldahl method inanalytical chemistryis a method for the quantitative determination ofnitrogencontained inorganic substancesplus the nitrogen contained in the inorganic compoundsammoniaandammonium(NH3/NH4+). Without modification, other forms of inorganic nitrogen, for instancenitrate, are not included in this measurement

We are given that the order of reaction is first order with respect with respect to H2and second order with respect to NO. So the rate law is as follows

-d / dt = k [H2][NO]2

where k is the rate constant for the reaction.

effective charge is Z - e , where Z = 21 ignore the 4s electron as it is ahead of 3d

and e is. 0*0.35 ( for 0 d electrons beside the 1 that we are calculating ) + 1*18 ( other 18 electron at the back)

so, e = 18

and Z-e = 21-18 =3

T1=0°C=273KV1=0.2dm^3T2=100°c=373K...V2=?

hence using Charles law V1/T1=V2/T20.2/273=V2/373V2=0.2*373/273=0.27dm^3

T1=0°C=273KV1=0.2dm^3T2=100°c=373K...V2=?

hence using Charles law V1/T1=V2/T20.2/273=V2/373V2=0.2*373/273=0.27dm^3

(i) 135 and 225Since 225 > 135, we apply the division lemma to 225 and 135 to obtain225 = 135 × 1 + 90Since remainder 90 ≠ 0, we apply the division lemma to 135 and 90 to obtain135 = 90 × 1 + 45We consider the new divisor 90 and new remainder 45, and apply the division lemma to obtain90 = 2 × 45 + 0Since the remainder is zero, the process stops.Since the divisor at this stage is 45,Therefore, the HCF of 135 and 225 is 45.

Let l = Slant height, h = perpendicular height, r = radius

Using pythagoras theoram

l*l = h*h + r*r13*13 = 12*12 + r*rr*r = 169 - 144r = 5

Radius is 5 cm

In 1 mole of gas , the no. of L = 22.4 L = 22.4*1000 cm³. = 22400cm³. now for 22.4cm³ , the no. of moles will be = 22.4/22400 = 0.001 so the no. of moleculws will be 0.001*(6×10^23) = 6×10^20 molecules.

Increased pressure = 760 + ( 25% of 760) = 760+190 = 950Volume of the gas = 400/760 × 950 = 95000÷190 = 500 cm^3

the answer is 320cmcube

20*x = 40*0.05

x = 2*0.05

x = 0.10

pH = 1

option b is the right answer

Since RBC has limited life span and is anucleated, meaning that it does not do much work in the sense of biosysnthesis (replication, transcription and translation etc). No synthesis, no energy required. Major role of RBC is gas transport. And this transport is a simple diffusion that uses concentration gradient in peripheral tissues. That is another evidence for no energy is required to do the major job of RBC. Cellular movement of RBC is very passively done by heart and stream of blood. Therefore, its viability does not go forever unlike other terminally differentiated cells. Not only the nucleus and mitochondria, but also much of the cytoplasmic components are also missing. Some differences found mammals and nucleated animals may have different physiology adapted and evolved in accordance to the environments over long period.

Plane mirror

Explanation:A plane mirror will form an upright virtual image of the object with the same size.

thanks

We will use the equation of motions:

THE EQUATION TO USE :S =ut + 1/2gt^2

Where S is the displacement, t the time u the initial velocity, g the acceleration due to gravity:

In this question:u = 0S = 5mt = 5

Substituting in the formula we have :5 = 1/2 × 25 × g5 = 12.5gg = 0.4 m/s²

The valence or valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. The concept of valence developed in the second half of the 19th century and helped successfully explain the molecular structure of inorganic and organic compounds

Theatomic number (represented by the letter Z)of an element is the number of protons in the nucleus of each atom of that element.Themass number (represented by the letter A)is defined as the total number of protons and neutrons in an atom

Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

Each of two or more isotopes of different elements, with the same atomic weight

Silver Chloride is the salt which is used in the black and white photography. Silver Chloride is also known as Silver Halides.

Reaction : 2AgCl(s) → 2Ag(s) + Cl2(g)This reaction is known as decomposition reaction due to sunlight or photons.

Silver bromide AgBr (s) = Ag (s) + Br2 (g)

Barium nitrate is Ba(NO3)2.

and in solution.. it will be Ba2+ and 2 NO3- , because both are ions

so, no of moles = M.V = 0.001*0.1 = 0.0001moles

now, in 1 moles the no. of atoms = 6.02×10²³

so, here the no..of moles and ions is 0.0001×3ions = 0.0003 moles ions

so, total no of moles are = 0.0003 × 6.02×10²³ = 3×6.02× 10^19

option C

[H+] = [OH-]= 1 x 10 -7 mol -3

Kw = [H3O+] [OH -]

Kw = (1 x 10 -7 mol dm -3) ( 1 x 10 -7 mol dm -3)

= 1 x 10 -14 mol2 dm -6

The degree of dissociation of water

= 10 -7 mol dm -3 / 55.55 mol dm -3

= 1.8 x 10-9

Since with increase in temperature dissociation of water increases, therefore, value of Kw increases as the temperature is increased. However, at all temperatures [H+] remains equal to [OH-] in pure water.

using charles lawV1/T1=V2/T2200/T1=260/303T1=200*303/260=233K

tq

Given Mass of gas = 7.5 g

Volume = 5.6L

At STP = 1 mol.of substance occupies 22.4L of volume.

Therefore for the above gas to acquire 22.4 lit volume its mass should be 22.4/5.6 x 7.5 =30g = mol. Wt of gas.

Since no element with at mass 30 exists it may be a hetero-atomic gas most probably NO

The Mg salt is an halide. The halide of Aluminium are AlX3. So B is the right answer.

The definition of an alloy is a finer metal mixed with a less valuable metal. ... An example of an alloy is the tin in the mixture of copper and tin that makes bronze. An alloy is a fusion of a two or more metals or of metals with non-metals. An example of an alloy is brass, which is made from copper and zinc.

as aluminium is +3henceAlX3

Anilineundergoes resonance and as a result, the electrons on the N-atom are delocalized over the benzene ring. As a result,anilineis less basicthan methylamine. Thus,pKbofaniline is more than that of methylamine.

right answer

Let the coordinates of the circumcentre of the triangle be (x, y).Circumcentre of a triangle is equidistant from each of the vertices.Distance between (8, 6) and (x, y) = Distance between (8, -2) and (x, y)√[(x - 8)²+ (y - 6)²] = √[(x - 8)²+ (y + 2)²][(x - 8)²+ (y - 6)²] = [(x - 8)²+ (y + 2)²](y - 6)2= (y + 2)²y²+ 36 - 12y = y²+ 4y + 436 - 12y = 4y + 416y = 32y = 2Distance between (2, -2) and (x, y) = Distance between (8, -2) and (x, y)√[(x - 2)2+ (y + 2)2] = √[(x - 8)²+ (y + 2)²][(x - 2)²+ (y + 2)²] = [(x - 8)2+ (y + 2)²](x - 2)²= (x - 8)²x2+ 4 - 4x = x2- 16x + 644 - 4x = -16x + 6412x = 60x = 5.Hence, the coordiantes of the circumcentre of the triangle are (5, 2).Circumradius = √[(5 - 8)²+ (2 - 6)²]= √(9 + 16)= √25= 5 units.

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The process in which the metals are graduallyeaten up by the action of air moisture or a chemical such as an acid is known ascorrosion.Rustingis thename givento thecorrosion of iron.

Given: Normality of H2SO4 =M1 = 0.05 M

Normality of NaOH = M2 = 0.1 M

Vol. Of NaOH= V2= 50 ml

Vol. Of H2SO4 =V1 = ?

Now,,

(M1 × V1) / n1 = (M2 × V2) / n2

Here n1 = n2 = coefficient of NaOH and H2SO4 which is 1

So,, M1×V1 = M2 × V2

Keeping values in it , we get ,.

0.05 × V1 = 0.10 × 50

V1 = (0.10×50) / 0.05

= 5/ 0.05

= [100 ml ] Ans……..

Vanillin is a phenolic aldehyde, which is an organic compound with the molecular formula C8H8O3. Its functional groups include aldehyde, hydroxyl, and ether. It is the primary component of the extract of the vanilla bean