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Thedifferencebetweenbaking soda and washing sodais water and carbon dioxide. Seriously.Baking soda'schemical makeup is NaHCO3 (1 sodium, 1 hydrogen, one carbon, and 3 oxygen molecules). ... Whenbaking sodais heated up to high temperatures, it breaks down to becomewashing soda, water steam, and carbon dioxide

Baking soda(NaHCO3) onheatingproduces carbon dioxide (CO2), which extinguishes a burning matchstick. Butwashing soda(Na2CO3.10H2O) onheatingdoes not produce any such gas, thus, it has no effect on burning matchstick.

Sodium Bicarbonate (and the chemical formula is NaHCO3) is the chemical name of Baking Soda.

Thechemicalformula forwashing sodais Na2CO3 or sodium carbonate

1 sodium hydroxide NaOH2 calcium hypochlorite Ca(ClO)23 sodium hydrogencarbonate NaHCO34 sodium carbonate Na2CO35 hydrated calcium sulphate

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Vitamin B3

Niacin, also known as Vitamin B3, is one of the eight, water-soluble B vitamins that is involved in the metabolism of glucose,fat, and alcohol to produce energy. Both function primarily in energy metabolic redoxreactionsof the breakdownofcarbs,proteins, alcohol, and carbohydrates, serving as coenzymes to over 400 enzymes.

NH4NO3Find the mass of the compound.14+1*4+14+3*16=80Mass of nitrogen in that compund=28

28/80=0.350.35*100=35%

Answer is 35%

I was just checking whether the app is working

As iron is a constituent element in the structure of haemoglobin so the metal iron is associated with haemoglobin.

if there is 4s2 and 3d4 then 1 electron of 4s goes to 3d4 to make it 3d5 and the final configuration is

Ar 3d5 4s1

are u 100% sure?

yes.. this is the correct answer.

it is found in group 5 period 4 NAA

its atomic no is 23 na

yeah

then 24electrons

yeah

1s2 2s2 2p6 3s2 3p6 4s2 3d4

3d5 half filled orbitals are more stable

Area of a sphere :

A = 4πr²

Area of hydrogen atom :

Convert the nm to m

1nm = 1 × 10⁻⁹ M

3.142 × 4 × [0.05 × 10⁻⁹] ² = 3.142 × 10⁻²⁰ M²

Area of hydrogen proton:

3.142 × 4 × [1.5 × 10⁻¹⁵] ² = 2.8278 × 10⁻²⁹ M²

(2.8278 × 10⁻²⁹) ÷ (3.142 × 10⁻²⁰) = 9 × 10⁻¹⁰

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Benzenehas molecular formula C6H6 that is there is presence of a double bondin between alternate carbon atoms and each carbon is attached to two carbon atoms by means of a singlebondand a doublebondand a hydrogen atom by a singlebond.

So there are a total of 12sigma bondsand 3pi bonds in benzene.

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The required reaction is,

H2 + Cl2 ==>2HCl

Here 6 litres of H2 reacts with 4 litres of chlorine.

But by Gay Lussacs law,

1 volume of hydrogen will react with 1 volume of chlorine.

Here the taken volume is 4 litres.

As HCl is highly soluble in water.It will soon dissolve[as water is added].And H2 gas will be left.

So the residual gas volume is = 6 litres - 4 litres.

= 2 litres.

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IUCDstands for Intra-Uterine Contraceptive Devices

chartered accountant

It is calcium or charted accountant

calcium and another is charted accountant

Bhai wrong abbreviation...It will me Ca that is calcium

option d

The atomic number (Z) ofsulphuris sixteen and itselectronicconfiguration is 2, 8, 6.

A tinctureiodine is a mixture of iodine (solid) in alcohol (liquid) it can be treated as solid in liquid solution. It is volatile in nature and can be used as an antisepticsolution.

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10. milk and water form emulsion.

11.Tincture of iodine, iodine tincture, or weak iodine solution is an antiseptic. It is usually 2–7% elemental iodine, along with potassium iodide or sodium iodide, dissolved in a mixture of ethanol andwater. Tincture solutions are characterized by the presence of alcohol.

solute - iodinesolvent - water/alcohol

Strong and Weak Bases and Base Ionization Constant, K. As with acids, bases can either be strong or weak, depending on their extent of ionization. A strong base is a base, which ionizes completely in an aqueous solution. The most common strong bases are soluble metal hydroxide compounds such as potassium hydroxide.

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When acetic acid is dissolved in water, it dissociates partially into H+or CH3COO–and ions and the following equilibrium is obtained.

CH3COOH + H2O<-----> CH3COO– + H3O+

Applying law of chemical equilibrium, In dilute solution, [H2O] is constant. The product of K and constant [H2O] is denoted as Ka, the ionization constant or dissociation constant of the acid is,Ka= [CH3COO–]×[H3O+]/[CH3COOH] …..(a)

The fraction of total number of molecules of an electrolyte which ionise into ions is known as degree of dissociation/ionisation α.Let'C" moles L–1be the initial molar concentration of acetic acid and α bethe degree of dissociation. Therefore, molar concentrations of different species before the ionisation and at equilibrium point are expressed as follows:

CH3COOH (aq)<----> H3O+(aq) + CH3COO-(aq)

Initial conc. C 0 0

Conc. at equil C(1- α) Cα Cα

Substituting the values of the equilibrium concentrations in equation (a),we get

Ka= Cα.Cα/C(1–α)= C2α2/C(1–α)

= Cα2/1–α

Since for weak electrolytes, the value of α is very small and can be neglected in comparison to 1 i.e., .1 – α = 1.Hence, we get

Kα= Cα2or α = √Ka/C

Furher, if V is the volume of the solution in litres containing 1 mole of the electrolyte,

C = 1/V.

Hence we have

α =√KaV ......(b)

Similarly, for a weak base like NH4OH, we haveα = √Kb/C = √KbV ........(c)

From equations (b) and (c),we can conclude the following statement.

In case of a weak electrolyte at a given temperature, the degree of ionization is inversely proportional to the square root of the molar concentration or directly proportional to square root of the volume of the solution which contains one mole of the electrolyte. This is calledOstwald’s dilution Law.

The octet rule is violated whenever a bonded atom has either fewer or more than eight valence electrons in its valence shell. BH₃ has only six valence electrons around B. The B atom has an incomplete octet.

BF3 has permanent dipole momentas there is higher electronegativity difference.

but can you explain it by structure

option A , energy depends on frequency and not on intensity

a) Fractional distillation is a technique used to seperate liquids according to their boiling points.

b) the mixture of two miscible liquids having difference of 10 degree celcius can be easily seperated by distillation and is based upon the principle the boiling point of more volatile liquid of the mixture and less volatile liquid of the mixture, since the more volatile is distilled first.

15.

Metal is a better conductor of heat than glass is, so if we serve them in metal utensils the utensils will get hot early and it would be hard to handle them.

Non-ideal solution is the one which does not obey theRaoult'slaw. The mixture has a minimum boiling point that means it has a maximum vapour pressure. Since the molecules are having a high VP means they have a tendency to escape more easily. Such a mixture cannot be separated completely by fractional distillation. We can only get either one of the components in pure state,not both.This can be deciphered on the basis of liquid-vapour equilibrium diagrams. This mixture of A-B shows positive deviation from Raoult's law.Suppose the mixture A-B has a composition x. The vapour given off has composition x1. So, the composition of distillate will shift towards C and residue towards A.so by repeated distillation we will only be able to get pure A not B,in the end A and C are obtained. If the mixture has composition y then we get pure B and distillate C.On mixing the two there is enthalpy change and heat is absorbed , H=+ve.That means temperature gets lowered.

Miscible liquids

Miscible liquids are harder to separate as they dissolve in each other. Miscible liquids are often separated using fractional distillation. This is possible as miscible liquids have different boiling points.

2)Immiscible means that the liquids don't dissolve in each other – oil and water are an example. It is possible to shake up the liquids and get them to mix but they soon separate. Separating immiscible liquids is done simply using a separating funnel. The two liquids are put into the funnel and are left for a short time to settle out and form two layers. The tap of the funnel is opened and the bottom liquid is allowed to run. The two liquids are now separate.

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A polymer is a large molecule, or macromolecule, composed of many repeated subunits.

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Two properties that liquids have in common with gases:1)The molecules of liquids and gases can slip and slide over each other causing them to flow.2)Liquids and Gases both assume the shape of their containers.

The technique to separate

1) Butter from curd can be separated by the technique of centrifugation.

2) mixture of miscible liquids is separated by the process of fractional distillation

3) To separate oil from water, add a solution of soluble ionic salt to the solution. Distillation, which involves boiling and condensing the water

4 mixture of Ammonium Chloride and saltCan be separated by sublimation.

A. Slagh. siliconL. low k. dyne s cm. cm is the correct answer

Iron articlesarepaintedto prevent them from rusting. After painting ironsurface does not come in contact with moisture and air which cause rusting.

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radius of the hydrogen atom is directly proportional to the square of its principle quantum number.

Area of circle (orbit) =π r²

Radius (r) of a shell =α n²/Z

Therefore, Area A = α π n4 (Z = 1 for both)

1st orbit:- n = 1, A = α π (1)⁴/Z = 1

2nd orbit:- n =2 ; A = α π (2)⁴/Z = 16

Therefore, ratio of second to first orbit is 16:1.

but the anwer is 64:1

We have to calculatethe work done on/by the system if the internal energy of the system falls by 100 joules even when 200 joules of heat is supplied to it.Solution:By sign convention,dQ = du + dw .......... (1)du = 200 J (∵Heat absorbed is positive )dw = - 100 J (∵Heat given out is negative)Substitutethese values in (1):dQ = 200 - (-100)dQ = 200 + 100dQ = 300 JThis is the required answer.

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