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Reaction type : 1st order reaction

Formula used :

k =( 2.303/t2-t1) log([R1]/[R2])

Given :T1= 10 min andT2= 20 min therefore T2-T1= 10 min

[R1] = 0.04 mol/L and [R2] = 0.03 mol/L

Substituting the values in the above equation

k =( 2.303/10) log( 0.04/0.03)

k = 0.2303 [log(0.04) - log (0.03)]

k = 0.2303 [-1.3979 - (-1.5228)]

k = 0.02876 /min

For the first order reaction half life t1/2is given by

t1/2= 0.693/k

We know, k = 0.02876 we get

t1/2= 0.693/0.02876

t1/2= 24.096 min

Establishing protected areas where wildlife habitat is preserved or restored. Developing new ways to farm, log and graze livestock that preserve habitat values. Education citizens about the importance of conserving wildlife.

Java break. There are two forms ofbreakstatement – unlabeled andlabeled. ... Unlabeledbreakstatement is used to terminate the loop containing it and can be used with switch, for, while and do-while loops.

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A hydrogen bond is a partially electrostatic attraction between a hydrogen atom which is bound to a more electronegative atom such as nitrogen, oxygen, or fluorine and another adjacent atom bearing a lone pair of electrons. Hydrogen bonds can occur between molecules or within different parts of a single molecule

It is of two typeIntermolecularIntramolecular

A hydrogen bond is a partially electrostatic attraction between a hydrogen atom which is bound to a more electronegative atom such as nitrogen, oxygen, or fluorine and another adjacent atom bearing a lone pair of electrons. Hydrogen bonds can occur between molecules or within different parts of a single molecule

Boyle's law statesthat at constant temperature for a fixed mass, the absolute pressure and the volume of a gas are inversely proportional. Thelawcan also be stated in an equivalent manner, that the product of absolute pressure and volume is always constant.

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how many kinds of speech

A hydrogen bond is a partially electrostatic force of attraction between a hydrogen atom which is bound to a more electronegative atom or group, such as nitrogen, oxygen, or fluorine —the hydrogen bond donor—and another adjacent atom bearing a lone pair of electrons—the hydrogen bond acceptor.

A hydrogen bond is a weak type of force that forms a special type of dipole-dipole attraction which occurs when a hydrogen atom bonded to a strongly electronegative atom exists in the vicinity of another electronegative atom with a lone pair of electrons.

A hydrogen bond is a partially electrostatic attraction between a hydrogen atom which is bound to a more electronegative atom or group, such as nitrogen, oxygen, or fluorine —the hydrogen bond donor—and another adjacent atom bearing a lone pair of electrons—the hydrogen bond acceptor.

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The ability of Oxygen atom to pull electrons is greater than of Sulfur i.e. O is more electronegetive than S. When an hydrogen is connected to an highly electronegative element like Oxygen (this usually happens with fluorine, oxygen, and nitrogen), it has higher intermolecular forces like Hydrogen bonding. Its a very strong bond that packs the water molecules closely together, forming a liquid while sulfur does not attract H nearly as strongly so they dissociate into a gas

thnq narayni

for this reaction np= nr=2hence, ∆n = 0

therefore, Kp= Kc(RT)^0=> Kp= Kc(1)=> Kp= Kc

Person suffering from long sightedness. so near point is 50 cm and far point is infinity.convex mirror is required to correct this defect.v =50cm u=-infinity 1/f=1/v-1/u 1/f=1/50-1/-infinity=1/50f=50cm =0.5m

power=1/focal length=1/0.5=10/5=2D

sir Apna question galat la liya hai

Consider an object which has travelled displacement s in the time t under uniform acceleration a.Let intial velocity of the object be u and the final velocity v.s=1/2t(u+v)-1from the veocity relationv=u+at -2substitute 1 in 2s=1/2t(u+u+at)=1/2t(2u+at)s=ut+1/2at^2

Total E=-2*kehence ke=E/-2hence ke=-13.6/-2=6.8eV

answer is 13.6

Ca(OH)2+Cl=CaOCl2+H2O

NaHCO3 + HCl ----> NaCl + H20 + CO2

This is because Cakcium hydroxide's reaction with the Carbondioxide in the air is slow and it needs 2-3 days to form the layer of calcium carbonate. So as to give shinywhite colour.

this is the Vipin calcium hydroxide reaction with the carbon dioxide in the air in slow and its need to 3 days tour from the layer of calcium carbonate so as to give snow white colour

because of reaction of calcium hydroxide

as B has lesser molecular weight it comes out faster option a

U r wrong

r1|r2=√m1|√m2 this my answer

In thelaboratory, H2 is usuallypreparedby the reaction of acids on metals such as zinc with Kipp's apparatus. The electrolysis of water is a simple method of producinghydrogen. A low voltage current is run through the water, and gaseous oxygen forms at the anode while gaseoushydrogenforms at the cathode

to remove layer of MgCo3 so that it easily burn

Magnesium ribbon should be cleaned before burning in air to remove the basic magnesium carbonate coating on it. This layer should be removed so that the ribbon may readily combine with oxygen while burning in air. Basic magnesium carbonate layer consists of magnesium carbonate and magnesium hydroxide.

to remove impurities

to remove mgco3 layer

In Van Arkel method Iodine is used for refining zirconium or titanium

Is the chlorine wrong answer?

Amount of a substance (called the solute) that dissolves in a unit volume of a liquid substance (called the solvent) to form a saturatedsolutionunder specified conditions of temperature and pressure.Solubilityis expressed usually as moles of solute per 100 grams of solvent.

d. iodine

Van Arkel method is used for refining Zirconium or Titanium. In this method oxygen and nitrogen, present as impurity are removed byheatingmetal in an evacuated vessel withiodine.

The energy required is given by the formula = (Mass)*(specific heat)*(change in temperature) = 12*(913)*(118-20) = 1073688J = 1073.688KJ.

can you help me with another

The states (i.e., solid, liquid, gas, or plasma), properties (e.g., hardness, conductivity), and reactions (both physical and chemical) ofmattercan be described and predicted based onthe types, interactions, and motions of the atoms within it. ... Each element has characteristic chemical properties.

15% H₂SO₄ solution means 15 g of H₂SO₄ is present in 100 g of Water.No. of moles of H₂SO₄ = 15 g / 98 g/mol = 0.153 molWeight of solvent = 100g - 15g = 85g = 85 × 10^-3 kg

Molality = Moles of solute / Weight of Solvent in kg= 0.153 / (85 × 10^-3)= 1.8 mMolality of given solution is 1.8 m ……[1]

Volume of solution = Mass of solution / Density= 100 g / 1.02 g/cm^3= 98.04 cm^3= 0.098 Litres

Molarity = Moles of solute / Volume of solution in litres= 0.153 / 0.098≈ 1.56 MMolarity of given solution is 1.56 M ……[2]

Faraday's First Law of Electrolysis states that only, According to this law, the chemical deposition due to flow of current through an electrolyte is directly proportional to the quantity of electricity (coulombs) passed through it. i.e. mass of chemical deposition, Where, Z is a constant of proportionality and is known as electro-chemical equivalent of the substance.Faraday's second law of electrolysis states that, when the same quantity of electricity is passed through several electrolytes, the mass of the substances deposited are proportional to their respective chemical equivalent or equivalent weight.

Hydrolysis of Alkyl Halides

Hydration of Alkenes

Oxymercuration and Demercuration of Alkanes

Hydroboration Oxidation

From Grignard Reagents

Grignard Synthesis of Alcohols

Products of the Grignard Synthesis

Reduction of Carbonyl Compounds

Hydroxylation of Alkenes

Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions. Example : Reaction of iron nails with copper sulphate solution.

The valency of an atom is equal to the number of electrons in theoutershell if that number is four or less. Otherwise, the valency is equal to eightminusthe number of electrons in theoutershell. Once you know the number of electrons, you can easily calculate the valency.

Iron (Fe) has an atomic number of 26, i.e. has 26 electrons. The energy of 4s and 3d orbital is similar (4s has slightly higher energy). Also note that the 3d orbital has 1 electron pair, rest of the electrons are unpaired. Now, iron exhibits2valence states of+2and+3.

sometimes 2 and sometimes 3

The valency of an element is the number of hydrogen atoms that can combine with or replace (either directly or indirectly) one atom of the element. ... For example, oxygen has six valence electrons, but its valency is 2. Some elements may have more than one combining power (or valency), while others have just one.

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Ans :- The valency of an element is the number of hydrogen atoms that can combine with or replace (either directly or indirectly) one atom of the element. For example, oxygen has six valence electrons, but its valency is 2. Some elements may have more than one combining power (or valency), while others have just one.

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combining capacity of an element

check the outermost shell e- that is the valency

Thevalencyof an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, thevalencyis equal to eight minus the number of electrons in the outer shell. Once youknow thenumber of electrons, you can easilycalculatethevalency.