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Ans :- Multiple reflectionof light is thereflectionof light back and forth several times betweenreflectingsurfaces. If areflectedlight ray isreflectedagain on being incident on another surface, it is termedmultiple reflections. In a Kaleidoscope, beautiful patterns are formed due tomultiple reflections.

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From the chemical equivalence No. Of equivalents of acid = No. Of equivalents of H3o+ H2O^+H^+= H3O^+ n-factor of H3O^+ is 1 Let the equivalent wt of acid be x 20g/x=0.5*1(no.of equivalents=n factor*moles) x =40g

From the chemical equivalence

No. Of equivalents of acid = No. Of equivalents of

H3o+ H2O^+H^+= H3O^+

n-factor of H3O^+ is 1

Let the equivalent wt of acid be x

20g/x=0.5*1(no.of equivalents=n factor*moles)

x =40g

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The answer is Graphite

thanks

The one non metal that is a conductor of electricity is graphite

Given mass = 20 gMolar mass of water (H₂O) = 2 x 1 + 16 = 18 gNo: of moles = given mass / molar mass = 20/18 = 1.11 moles

180g of water = 9.99 mole

moles = given mass/ total mass.

12/32=moles

when non-metals are combined with oxygen then "neutral" or "acidic" oxides are formed. EX:- NO2 and SO2

when non metals combine with oxygen then it forms acidic oxide(non metal oxide) Eg-. Chlorine is a non metal . It forms cl2o

(a)32 grams of Oxygen gas = 1 moleThen, 12 grams of Oxygen gas = 12 / 32 mole = 0.375 mole(b)18 grams of water = 1 mole20 grams of water = 20 / 18 mole ≈ 1.11 moles(c)44 grams of CO2 = 1 mole22 grams of CO2 = 22 / 44 mole = 0.5 mole

Theoxygen moleculeis made up of twooxygenatoms bonded together. However, in certain circumstances, threeoxygenatoms bond together,formingamoleculecalled ozone.Oxygen moleculeisformedby the sharing of electrons (2 electrons each) between 2Oxygenatoms.

Suppose a chemist has chosen 10 to the power of 20 as the number of particles in a mole, what would be the molecular mass of oxygen gas?

Answer

4

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3 ANSWERS



Alexander Mathey, former Chemical Engineer, retired, lives in Athens, GR

Answered Oct 8, 2017

Avogadro’s number is the number of atoms (or molecules) in a gram-atom (or gram-molecule) of substance.

It is therefore tied to the definition of1 g = 1 kg*10^(-3).

If you would introduce some other number of atoms (or molecules) as a new unit, say “Newmol”, this would in no way change the Atomic (or Molecular) Mass of elements and compounds, since these are calculated in Atomic Mass Units (AMUs), where 1 AMU is:

“1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest”.

You see, grams, or any other man-made unit of mass, doesn’t enter the definition of AMU

3.2 g oxygen molecules = 0.1 moles of oxygen molecules

0.1 moles O2 x avagadro's number = number of oxygen molecules

since each oxygen molecule has 2 oxygen atoms, and each oxygen atom has 8 electons, each oxygen molecule has 16 electrons. multiply the number of molecules by 16...that will give you the total number of e- in 3.2 g O2.

A=c2h2 the second part is not clear

Mercury is a liquid at room temperatureSodium can be cut easily with knifeSilver is best conductor of heatLead is poor conductor of heat

it is the best conductor of heat

1=мєя¢υяу2=ѕσ∂ιυм3=Ѕιℓνєя4=вιѕмαт

1. mercury2. sodium3. silver4. wood

The solids are characterized by incompressibility, rigidity and mechanical strength. The molecules, atoms or ions in solids are closely packed, i.e., they are held together by strong forces and cannot move about atrandom. Thus solids have definite volume, shape, slow diffusion, low vapour pressure and possess the unique property of being rigid. Such solids are known as true solids.E.g. NaCl, KCL, Sugar, Ag, Cu, etc.On the other hand the solid which loses shape on long standing, flows under its own weight and is easily distorted by even mild distortion force is called pseudo solid e. g. glass, pith etc.

When we calculate the oxidation states for the first 3 option the cationic part is A3= +2x3 = +6.Thus the anionic part has to be -6C4= -2x4 = -8 & B = +5 overall = -3total 2 such ions = -3 x 2 = -6thus counterbalances the charge on A = +6correct answer is option c

Option cReaction occurs as follows,

L ---> M

Initially L was 10 gram

In 30 minutes it decreases to 5 gram i.e.50%

In 60 minutes it decreases to 2.5 gram i.e.25%

In 90 minutes it decreases to 1.25 gram i.e.12.5%

We observe uniform decrease in reactant here, Hence this is a first order reaction.

2/3(3/4+4/5)=2/3{(15+16)/20}=2/3×21/20=7/10.

2/5 is curect answer

the answer is 10/3 you can do it it's very easy

option (2) is the correct answer

option (3) is the right answer

options 2 is the correct answer.

436 is the correct answer

This mechanism is far more simple than a can of spray paint. Syringes of all types utilize Boyle's law on a very basic level.

When you pull the plunger out on a syringe, it causes the volume within the chamber to increase. As we know, this causes the pressure to do the opposite, which then creates a vacuum. When a syringe is empty, the vacuum within the chamber sucks fluid in through the needle.

if we dip the red litmus paper in distilled water no reaction will take place.if we dip in an acidic solution it will remain red in colour but if we dip in the basic solution the red litmus paper will turn blue.

B) is correct answer

B) is correct answer

option D is the correct answer I think

potion 'd' is correct answer

(A)chain isomerism .........

(d) all of abovealcohol exhibits chain, position,functional, optical isomerism

4) Optical isomerism and geometric isomerism

Explanation:In stereoisomerism, the atoms making up the isomers are joined up in the same order but still manage to have a different spatial arrangement. Optical isomerism and geometrical isomerism are forms of stereoisomerism.

i) A structural isomer, or constitutional isomer, is a type of isomer in which molecules with the same molecular formula have different bonding patterns and atomic organization, as opposed to stereoisomers, in which molecular bonds are always in the same order and only spatial arrangement differs.ii) In stereochemistry, stereoisomerism, or spatial isomerism, is a form of isomerism in which molecules have the same molecular formula and sequence of bonded atoms, but differ in the three-dimensional orientations of their atoms in space.

Thunderstorms result from the rapid upward movement of warm, moist air, sometimes along afront. As the warm, moist air moves upward, it cools,condenses, and forms a cumulonimbus cloud that can reach heights of over 20 kilometres (12mi). As the rising air reaches itsdew pointtemperature, water vapor condenses into water droplets or ice, reducing pressure locally within the thunderstorm cell. Any precipitation falls the long distance through the clouds towards the Earth's surface. As the droplets fall, they collide with other droplets and become larger. The falling droplets create adowndraftas it pulls cold air with it, and this cold air spreads out at the Earth's surface, occasionally causing strong winds that are commonly associated with thunderstorms

All you have to do is unplug the telephone and unnecessary appliances,avoid running water,turn off the air conditioner,draw the blinds in case a window breaks,listen to the news for updated weather reports,pull off of the highway during a storm,avoid using electronics including cell phones or two-way radios,make sure all windows and doors are shut.

Ans :- The anode used for this process is made up impure. Cathode: The cathode used for the electrolysis is pure copper sheets. Electrolyte: Copper sulphate solution is used as an electrolyte in this process.

During electrolytic refining, impure metal is made anode and a thin strip of pure metal M is made cathode and the electrolyte used is the soluble salt of Metal M which is to be refined.

Electrolytic refining:- Many metals, such ascopper,zinc,tin,nickel,silver,goldetc. are refined by electrolysis.

Hence,option A is correct.

differences between voluntary and involuntary

Dalton law- In chemistry and physics, Dalton's law states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases. This empirical law was observed by John Dalton in 1801 and published in 1802. and is related to the ideal gas laws.b) Avogadro law: a law stating that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.c) Berzelius law: An avid and methodical experimenter, Jöns JakobBerzelius(1779–1848) conducted pioneering experiments in electrochemistry and established thelawof constant proportions, which states that the elements in inorganic substances are bound together in definite proportions by weight.d) hunds rule: Hund's rule of maximum multiplicity is a rule based on observation of atomic spectra, which is used to predict the ground state of an atom or molecule with one or more open electronic shells

Oxidizing Agent:- An oxidizing agent is a substance that has the ability to oxidize other substances,in simple words to cause them to lose electrons.

Oxidant :- An oxidant is a reactant that removes electrons from other reactants during a Redox reaction. An oxidant may also be called an oxidizer or oxidizing agent.

thanx

2PbO is reduced to 2PbC is oxidised to CO2oxidising agent - 2PbOreducing agent - C

Fertilizer grade is an expression referring to the legal guarantee of the available plant nutrientsexpressed as a percentage by weight in a fertilizer, e.g. a 12-32-16 grade ofNPK complex fertilizerindicates the presence of 12 %nitrogen(N), 32%phosphorous(P2O5) and 16%potash(K2O). On a fertilizer bag, the NPK content is always written in the sequence N, P2O5, K2O.

Fertilizers are classified as

Straight fertilizers: These contain one of the 3 major nutrients N, P or K.

Compound /complex fertilizers: These contain at least two out of the three major nutrients.