Explore topic-wise InterviewSolutions in Current Affairs.

Answer:

Electrons are placed in fixed energy levels called shells. These shells are also called orbits. These orbits or shells are represented by the letters K, L, M, N,… or the numbers n=1, 2, 3, 4,…. The arrangement of electrons in the shells is known as electronic configuration. The maximum number of electrons that can accommodated into 1st(K )shell -2, 2nd(L)shell -8, 3RD (M)shell -8, 4th shell 18, 5th shell -18, 6th shell-32 and 7th shell is 32.

The order of arrangement of electrons into various shells is 2 8 8 18 18 32 32 For example, sodium Atomic number of sodium is 11 Electronic configuration of sodium is 2 8 1. Valency: The combining CAPACITY of an element is known as valency. The combining capacity of the atoms to form molecules either with same or different elements is defined as valency. Atom contains less than four electrons in its outermost shell; the valency of an atom is EQUAL to the number of electrons present in the valence shell.

Example: Sodium has one electron in its outermost shell, so the valency of sodium is 1. Calcium has two electrons in its outermost shell, so the valency of calcium is 2. Aluminum has three electrons in its outermost shell, so the valency of aluminum is 3. If the outer shell has more than four electrons, the valency = 8 - the number of electrons in the outer shell. Example: Chlorine Atomic number of chlorine is 17 Electronic configuration of chlorine = 2 , 8 ,7 The valence shell has 7 electrons Hence number of valence electrons present in chlorine = 7 Valency of chlorine = 8 – 7 = 1

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ANSWER:

YA in the water air is also maintain space. ALTHOUGH u can't SEE water vapour u can feel it......

Hey USER here is Answer

Question

what is the CHEMICAL formula of lake water ?

Answer

H2o

Answer:

First equation is worng as HYDROGEN gas also evolved and formula of aluminium SULPHATE also INCORRECTLY written

EXPLANATION:

i) NA get oxidised while O2 get reduced.

ii ) H2 get oxidised , Cu get reduced .

Explanation:

An OXIDE is any chemical compound that contains one or more OXYGEN ATOMS. ... Nonmetal oxides are oxides of nonmetals. The main difference between METAL oxides and non metal oxides is that metal oxides are basic compounds whereas nonmetal oxides are acidic compounds.

Answer:

CHEMICAL reaction is a reaction which occurs in a chemical change process. we can observe it by FINDING FORMATION of new SUBSTANCES

Explanation:

The normal BLOOD glucose level (tested while fasting) for non-diabetics, should be between 3.9 and 7.1 mmol/L (70 to 130 mg/dL). The GLOBAL mean fasting plasma blood glucose level in humans is about 5.5 mmol/L (100 mg/dL); however, this level FLUCTUATES throughout the DAY.

it is a COMBINATION reaction

by the WAY it HANDWRITING is superrrr

hope this HELPS U

HEY USER ,

HERE IS YOUR ANSWER:-

Hydrochloric acid contributes to protein digestion by supplying H+ ions which activates pepsinogen , the precursor of pepsin.

sulphuric acid is a key substance in the chemical industry. it is most commonly used in fertilizer MANUFACTURE , it is also important in mineral processing , oil refining .

acetic acid is used for the treatment of OUTER ear infections like the growth of fungus and bacteria .

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Answer:

by their ODOUR or taste or COLOUR or pressure APPLIED by them.

naso4+bacl-baso4+nacl

I can't SOLVE this.

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Answer:

Silver chloride is stored in dark COLOURED bottles because it reacts with sunlight and decomposes to FORM silver and chlorine gas. So to prevent this it is stored in dark coloured bottles. the type of REACTION is photolytic DECOMPOSITION reaction.

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Answer:

It reacts with water to form Calcium Hydroxide Ca(OH)2 (SLAKED lime) and HYPOCHLOROUS acid. (HOCL)This RELEASES the active Chlorine which will be the oxidizing agent.

Answer:

So 1 mole of ELECTRONS has a mass of 9.1 X 10¯³¹ x 6.023 x 10²³ ≈ 5.481 X 10^(-7) kg. One mole of electron means Avogadro NUMBER of electrons or 6.023×10^(23) electrons. Since mass of 1 electron is 9.1×10^(-31)kg when you do the MATH, the mass of one mole of electron would be 5.486×10^(-7)kg.

Answer:

To avoid the bumping of the boiling liquid.

Explanation:

While determining the boiling point of WATER, teacher suggested to add some pumice STORM pieces to the hard glass test tube containing water. This is done because when the water in the test tube boils, the temperature of the liquid increases. The energy of increased temperature is given in FORM of bubbles. But increasing more temperature the water of the tube may explode out. Thus stones of pumice stone are added to the test tube to give more surface AREA to the bubbles and thus save the test tube water from exploding out.

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Answer:

it is CALLED LATENT heat

Explanation:

latent heat is the heat energy that is observed to OVERCOME the INTERMOLECULAR FORCE of attraction

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ANSWER:

It's

EXPLANATION:

UNIVERSAL TRUTH that is why

matter have mass and occupy SPACE

hope this HELPS U

EXPLANATION:

ASK the ACCURATE QUESTION

This QUESTION is INCOMPLETE. PLZ UPLOAD it CORRECTLY again.

Explanation:

given mass , m =19.7 kg

N= no. of atoms

A= avogadro no.

molar mass , M= 197

m/M=N/A

19.7/197 =N/6.022×10^23

0.1×6.022×10^23 = 6.022×10^22 atoms

u can ALSO convert kg into gram

ANSWER:

No, boiling of water is a physical CHANGE.

Explanation:

It is a physical change because no NEW substances with new properties are formed. It is a reversible PROCESS.

Therefore, boiling of water is a physical change.

Answer:

The III sturcture is AROMATIC SINCE it FOLLOWS (4n+2)π electron system hence it is most stable.

The II STRUCTURE possess anti aromatic behaviour due to which it is very UNSTABLE whereas the I structure is resonance stabilized and also possess aromatic behaviour in the ring hence the order should be.

Answer:

This catalyst had high ACID density as characterized by SCANNING electron MICROSCOPE ...

To date, HOWEVER, no studies have examined the FUNCTION of miR172 in Jatropha

Answer:

VINEGAR is ALSO KNOWN as dilute acetic acid  that is CH3COOH.

it consist of ELEMENT  carbon oxygen and hydrogen

and magnesium chloride consist of magnesium and chlorine

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Answer:

When a soap is used in hard water, a SOLID SUBSTANCE we call scum FORMS.

This is because charged calcium and magnesium particles (called ions ) present in the water react with soap to FORM an insoluble substance. Scum BUILDS up on clothes, baths and sinks. ...

The new substance, scum, does not dissolve in water.

Hi there,

GIVEN

Carbon ATOM CONTAINS

6 protons

6 neutrons

6 electrons

Sample mass is 6 gm

Atomic mass of carbon is 12 gm

Avogadro's number = 6.02×10^23

◇◇◇◇◇◇◇◇◇◇◇◇◇◇◇◇◇

So,

☆ Number of moles of the sample

is Sample mass ÷ atomic mass

= 6÷12=0.5 mol

☆ Number of atoms is

number of moles × avogadros nub

0.5×6.02×10^23 = 3.01×10^23 atom

☆ Sum of particals in ONE atom is 18 particals

☆ So total number of paricals are

18× 3.01×10^23

♡ Hope the answer is helpful

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Answer:

1. The chemical formula of calcium carbonate is CaCO3. The elements calcium, carbon and oxygen form the compound calcium carbonate. This compound is available in the nature in the form of sedimentary rock like limestone, metamorphic rock like marble. It is extracted from the rock forming mineralssuch as calcite and travertine.  Calcium carbonate has very many uses in the real world.

2.Calcium is an important mineral needed by us and other living organisms. In humans, it is very important for bone formation and teeth formation. Plants and animals absorb calcium carbonate from water where it is found in the form of calcium bicarbonate (calcium hydrogen carbonate) to build their skeletons and shells. The main components of shells of marine organisms, snails, pearls, coral, and a NUMBER of sea shells is calcium carbonate. Egg shells are MADE of approximately 95% calcium carbonate. When plants and animals die, the compound is returned to nature AIDING in rock formation. 

3.Pure material is a soft, white, insoluble powder. This powder used in the form of thin sticks makes the Chalks that are used as teaching aid. The mineral calcite is used by the construction industries to produce cement, concrete, and manufacture of iron, steel and glass. When calcium carbonate is heated, it decomposes into lime and carbon dioxide which are further used as raw material.

4.Calcium carbonate reacts uniquely with acids. When it comes in contact with acid, however strong it may be, it produces carbon dioxide. This results in the natural phenomena STALACTITES and stalagmites which TAKES more than thousands of years to form.

Answer:

yes

Explanation:

yes every matter can exist at 3 different STATES namely solid liquid and gaseous state

when the material is cooled up to the freezing point it exists as a solid and when it is heated up to the melting point it exists as water and when it is heated up to the boiling point it exists as a gas

not only in 3 states it exists in two more states

when it is SUPERCOOLED it exist in Bohr-einstein condensate state and when it is SUPER heated it exists in plasma state

but u asked only about three TYPES so here are the examples for those three types

ex:- solid :- ice , liquid :- water , gas :- watervapour

hope this helps u......

but if u need more info about those two more states of matter then here u go

Plasma :- It is the state of matter where the material is HIGHLY heated up

ex :- sun

Bohr Einstein condensate :- it is the state of matter where the material is super cooled

ex:- super fluid helium

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The particles of SAND remain of the same shape....their shape doesn't change.... The have a FIXED shape..... HENCE they are not a LIQUID......

Ex. Sugar can be put into any container but the shape of INDIVIDUAL sugar crystal doesn't change.

Answer:

In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop EXPERIMENT to determine the charge of an electron. They SUSPENDED tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with UPWARD drag and electric forces. The density of the oil was known, so Millikan and Fletcher could determine the droplets’ masses from their observed radii (since from the radii they could calculate the volume and thus, the mass). Using the known electric field and the VALUES of gravity and mass, Millikan and Fletcher determined the charge on oil droplets in mechanical equilibrium. By repeating the experiment, they confirmed that the CHARGES were all multiples of some fundamental value. They calculated this value to be 1.5924 × 10−19Coulombs (C), which is within 1% of the currently accepted value of 1.602176487 × 10−19 C. They proposed that this was the charge of a single electron.

Specific Conductivity And Molar conductivity
This topic explains about the specific conductivity and molar conductivity. The conductance of material is the property of materials due to which a material allows the flow of ions through itself and thus conducts ELECTRICITY. It is generally defined as the reciprocal of resistance of that material. SI unit of conductance is S (Siemens). Specific conductivity (better known as conductivity) is the measure of the ability of that material to conduct electricity. It is represented by the symbol “К”. Hence, by DEFINITION,

G = 1R

R= ρ1A

К= 1ρ

G =К Al

Where,

К = conductivity,

ρ = resistivity of the material

G= conductance

R= resistance

l = length

A= area of cross section

The conductance of a material depends on the NATURE of the material, no. of valence electrons for a material and temperature. Metals are good conductors of electricity due to their valence electrons. We observe that the conductance of materials decreases with increase in temperature.

Water in its pure state is known to have very low conductivity due to the presence of hydroxyl ions. The presence of electrolytes further ENHANCES the conductivity as they furnish their ions in the solution. The conductance of electricity by ions present in the solution is called electrolytic or ionic conductance.Specific conductivity or conductivity of an electrolytic solution at any given concentration is the conductance of one unit volume of solution KEPT between two platinum electrodes with the unit area of cross-section and at a distance of unit length.The conductivity of electrolytic solutions depends on:

The nature and the concentration of the electrolyte added
The size of the ions produced and their salvation.
Solvent nature and viscosity.
Temperature.
Due to charge, concentration and size of the ions in which electrolytes dissociate or ease with which the ions move under a potential gradient, the conductivity of solutions of different electrolytes differs with the same solvent and at a given temperature. Hence we define a more common term molar conductivity for an electrolyte solution. The molar conductivity of a solution at a given concentration is the conductance of the volume of solution containing one mole of electrolyte kept between two electrodes with the unit area of cross section and distance of unit length. In general terms, it is defined as the ratio of specific conductivity and the concentration of the electrolyte. The symbol Ʌm denotes it.

Ʌm= Kc

Where,

К = specific conductivity

c= concentration of electrolyte.

LIQUID is the answer

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the ANSWER is above .

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Answer:

The decomposition of VEGETABLE matter into COMPOST in an exothermic reaction beacouse microbes need energy to break the BOND of vegetable that's why it produces heat energy HENCE this decomposition reaction is a exothermic reaction.

UR question is not clear.... So PLZ.. It's a HUMBLE request..... Type ur questions PROPERLY and then only post....

i DONT KNOW ASK to your TEACHER

Important Points About NUCLEAR Power in India. Nuclear power in India is the fourth-largest source of electricity after thermal, hydroelectric, and RENEWABLE SOURCES (of electricity). India has 22 nuclear reactors operating in 8 nuclear power PLANTS. The total installed capacity of nuclear power in India is 6780 MW.

Nuclear energy is a clean, safe, reliable and competitive energy source. It is the only source of energy that can replace a significant part of the fossil fuels (coal, oil and gas) which massively pollute the atmosphere and contribute to the greenhouse effects

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Secondary School

Chemistry

5+3 pts

Write the formula of compounds which are formed by the following pairs of elements. 

Silicon and bromine 

Aluminium and sulphur

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 by Anantabordoloi1897 24.02.2019

Answers





Mahira887 

Virtuoso

(a) SiBr4 : Silicon tetra bromide

(b) Al2(SO4)3 : Aluminium sulphate..

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Gadakhsanket 

★ Brainly TEACHER ★

Dear student,

● Answer -

Silicon + bromine => SiBr4

Aluminium + sulphur => Al2S3

● EXPLAINATION -

(1) Silicon + Bromine -

Silicon on reaction with bromine gives silicon bromide with molecular formula SiBr4.

Si + 2BR2 --> SiBr4

(3) Aluminum + Sulphur -

Aluminum on reaction with sulphur gives aluminum sulphide with molecular formula Al2S3.

2Al + 3S --> Al2S3

Hope this helped you.

Thanks for asking..

Explanation:

Generic term used in the CASE of polymeric material that may contain other substances to improve performance or reduce costs.

Note 1: The USE of this term instead of POLYMER is a source of confusion and thus is not recommended.

Note 2: This term is used in polymer engineering for materials often compounded that can be processed by flow.[1]

MG+2H2O-----Mg(OH)2+H2

hope this HELPS U

Answer:

Explanation:

DIRECT effects of WEATHER on AIR quality. ... For example, sunshine, RAIN, air temperature and wind can affect the amount of air pollution present: Sunshine - makes some pollutants undergo chemical reactions, producing smog. Rain - washes out water-soluble pollutants and particulate matter.

ANSWER:

I think the right answer is water.

Hope it HELPS

ANSWER:

ovicides and larvisides

Explanation:

CHEMICAL EQUATION need to be balanced so that it follows the law of conservation of mass balance chemical equation OCCURS when number of the DIFFERENT atoms element in the REACTANT side is equal to that of the product side balancing chemical equations process of trial and error

EXPLANATION:

its ENDOTHERMIC REACTION BEACAUSE it absorve SUNLIGHT

ANSWER:

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Explanation:

FORMULA of ethane=C2H6

Formula of ETHYLENE dichloride=C2H4Cl2

conversion

=C2H6 + C12=C2H5Cl +Hcl