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Water can be formed in a few different ways. Typically it is formed through combustion. When hydrocarbons burn in oxygen they release CO2 and H2O. This is included in metabolic combustion too. When our cells burn carbohydrates it forms CO2 and H2O.

Burning Hydrogen gas with Oxygen gas will make pure water, 2H2 (g) = O2 (g) --> 2H2O (g) This reaction is quite spontaneous (and explosive) one it has been ignited. This is the reverse process of splitting water apart [through elelctrolysis] into H2 and O2. Many other chemical reactions produce water as a product. Similar to burning Hydrogen gas, burning Hydrocarons (example, Methane or Octane) also produced water [amongst other things]. Another exakmple would be a reaction between baking soda and vinegar. The reaction produces Carbonic acid (H2CO3) which quickly decomposes into Carbon Dioxide (bubbles) and water

1)C6 H12 O6 ---- glucose------------molar mass of C = 12molar mass of H = 1molarmass of O = 16

12(6) + 1(12) + 16(6)

72 + 12 + 96

= 180gms

2) 2*12+1*6(C2H6)24+630gms

3)(K2CO3)2*39+12*1+16*378+12+48138gms

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(a) A number that relates the rate of a chemical reaction with the concentrations of the reacting substances:the sum of all the exponents of the terms expressing concentrations of the molecules or atoms determining the rate of the reaction.

(b) The threshold energy for production of a particle is the minimum kinetic energy a pair of traveling particles must have when they collide.

The threshold energy is always greater than or equal to the rest energy of the desired particle.

The nucleur reaction is

X²⁴⁰-----> Y¹¹⁰ + Z¹³⁰ + Q

As per given data

Q = 110 x 8.5 + 130 x 8.5 - 240 x 7.6

= 240 (0.9) MeV = 216 MeV

Blood has many different functions, including:

transporting oxygen andnutrientsto thelungsand tissues.

forming blood clots to prevent excess blood loss.

carrying cells andantibodiesthat fight infection.

bringing waste products to the kidneys and liver, which filter and clean the blood.

regulatingbodytemperature.

components of bloodAll humans produce these blood components--there are no populational or regional differences.

Red Cells.

White Cells.

Platelets.

Plasma.

Agglutination

Alloy is a metal made by combining two or more metallic elements, especially to give greater strength or resistance to corrosion. Advantages of making alloy: 1 pure iron is very flexible and soft so it is alloyed with chromium , nickle , carbon etc to make it hard and durable (in the form we know it) 2 alloys are an excellent method to prevent corrosion.

11( B)12( C) 13( A)

11 (b)12 (c)13 (a)

11 (b) 12(c)12 (a) is the right

11,(b)12,(c)13,(a) is the right answer

calculate the molarity of 100 ml 9.8% ( w/w) H2SO4

total mass of solution is = 100*1 = 100gm and 9.8% of 100gm = 9.8g is the mass of H2SO4

so, moles of H2SO4 = 9.8/98 = 0.1 => M = 0.1/100ml = 0.1/0.1L = 1M

now adding it with 100ml , of 1M H2SO4

total volume = 200ml and total mol = 0.2

so, molarity = 0.2/0.2 = 1M , total mass of H2SO4 = 0.2*98 = 19.6g

so, option A ✓ option B ✓ option D ✓

A solution of sodium carbonate contains 53.0g of solute in 215ml of solution what is it's molarity

mass of C8H18 is - volume * density = 0.8*1425 = 1140 gm

now, equation of combustion of is

2C8H18 + 25O2 → 18H20 + 16CO2

now, moles of C8H18 = 1140/114 = 10moles

so , for 2 moles → 25 moles of O2 are need

then for 10 moles → 25*5 = 125 moles of O2 is required.

Option c is correct.

a) 6XeF4+ 12H2O → 2XeO3+ 4Xe + 3O2+ 24HF

b) Ca3P2 + 6H2O →3Ca(OH)2 + 2PH3

c)3Zn +8HNO3(dil) =3Zn(NO3)2+2NO +4H2O

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CaO(calcium oxide) + H2O(water)-- Ca(OH)2 + HeatIt is a combination reaction because two compounds on reaction give one product.As heat is also evolved during the process, thus it is also an example of exothermic reaction.

Hydrogen is a highly reactive fuel. Hydrogen molecules violently react with oxygen when the existing molecular bonds break and new bonds are formed between oxygen and hydrogen atoms. As the products of the reaction are at a lower energy level than the reactants, the result is an explosive release of energy and the production of water.

Its an example of exothermic reaction

An exothermic reaction is a chemical reaction that releases energy by light or heat.

Robert Brown was thescientist who studied the movement of pollen grains suspended in waterthrough microscope.

He named this phenomenon 'Browninan Motion

f = 98.7Mega hertz = 98.7 x 10^6 hertz

All electromagnetic waves travel with speed of light c = 3 x 10^8 m/s

We have the formula c = λ x f

λ = c / f = 3 x 10^8 / 98.7 x 10^6 = 300 / 98.7 = 3.03 m

The process of converting vegetable oil into vegetable ghee is known as HYDROGENATION. In this process the hydrogen is added to the oil to convert it into ghee by removing the bonds between the atoms.

CH2=CH2+H2 gives CH3-CH3.

Hydrogenation is an addition reaction.

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A system that releasesheatto the surroundings, anexothermic reaction, has a negative ΔH by convention, because theenthalpyof the products is lower than theenthalpyof the reactants of the system. Theenthalpiesof thesereactionsare less than zero, and are thereforeexothermic reactions.

HCl + Anhydrous ZnCl2 is known as Lucas Reagent. It is used to determine the DEGREE of an alcohol. The alcohol is reacted with Lucas reagent, and give alkyl halide along with water.

if refrative index is more , speed of light will be less

so, r(g/w) = (1/2×10^8)/(1/2.2×10^8) = 2.2/2 = 1.1

and similarly r(w/g) = 2/2.2 = 10/11 = 0.909

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option D is correct.

Cations are always smaller in radii than their parent atoms because by the loss of one or two electrons, effective nuclear charge increases. Due to this, forces of attraction of nucleus for electrons increases and hence, ionic radii decreases. On the other hand, anions are always larger in radii than their parent atoms because by the addition of one or two electrons effective nuclear charge decreases. Due to this, forces of attraction between nucleus and valence shell electrons decreases and hence, ionic radii of anion increases.

Therefore,5.6 Lis occupied by 0.25 moles of a gas, which will thereforecontain0.25 x 6.023 x 10^23 particles. 1.50575 * 10^23 molecules ofOxygengas in5.6 L. One moleculecontains2atomsofoxygen, so the number ofatomsis double the number of molecules. 3.0115 * 10^23atomsofoxygenin5.6 L oxygengas.

Velocity constant 'K' is characteristic constant of a reaction and depends only on temperature and catalyst.

If 9.9 eV energy is supplied to H atom the no. of spectral lines emitted is equal to 0. The energy difference between ground state and first excited state of electron of H atom is 13.6 − 3.4 = 10.2 e V . When energy less than this is applied, no emission occurs

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The correct option is 'D'.

theLyman seriesis ahydrogen spectral seriesof transitions and resultingultravioletemission linesof thehydrogenatomas anelectrongoes fromn≥2 ton=1 (wherenis theprincipal quantum number), the lowest energy level of the electron.

lyman nf. 1. ni. 2 3 4balmer visible nf. 2 ni 3 4 5

Ans :- The key difference between double salt and coordination compound is that a double salt contains two salts with different crystal structures whereas a coordination compound contains a central metal ion surrounded by molecules or ions known as ligands. A double salt is a mixture of two forms of salt compounds.

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Alpha particlesare released by high mass, proton rich unstable nuclei. The alpha particle is a helium nucleus; it consists of two protons and two neutrons. It contains no electrons to balance the two positively charged protons. Alpha particles are therefore positively charged particles moving at high speeds.

Beta particlesare emitted by neutron rich unstable nuclei. Beta particles are high energy electrons. These electrons are not electrons from the electron shells around the nucleus, but are generated when a neutron in the nucleus splits to form a proton and an accompanying electron. Beta particles are negatively charged.

Gamma raysare electromagnetic waves of very short wavelength and high frequency. Gamma rays are emitted by most radioactive sources along with alpha or beta particles. After alpha or beta emission the remaining nucleus may still be in an excited energy state. By releasing a gamma photon it reduces to a lower energy state. Gamma rays have no electrical charge associated with them.