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A EQUATORIAL POSITION

This is a BEAUTIFUL 12" THALI or PLATE set MADE of matchless, premium quality bronze popularly known as kansa. It is also known as bell metal. ... Bell- metal plates, tumblers and bowls never tarnish like brass or COPPER and are longer lasting than steel.

The element is LIKELY to be sillicon.
There is a high jump in IP value from IP4 to IP5. This shows that after losing 4 electrons, the element attains noble gas configuration.

Hence, as we require more energy to remove an electron from a stable element there is d increase in energy.

The element now has 4 valence electrons which is same as that of Si.

Endoplasmic reticulam is the MEMBRANE OUTSIDE the NUCLEOLUS.
it is of two types.

function:
1.Help in the FORMATION of plasma membrane.
2.Help in the transportation inside the CELL.

Bell metal is a HARD ALLOY used for making BELLS , it is a form of bronze with the HIGH content of tin.

Dye is a MIXTURE of TWO or more than two COLOURS .
The ink that we use has water as the solvent and dye as a solute. As the water rises in the filter paper it TAKES ALONG with it is the Dye particles.

O = 2 , 6

since there are 6 electron in its valence shell

so valency = 8-6 = 2

MEANS it NEEDS 2 e to complete its valence shell so -2

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Please find below the solution of your ASKED query:

2H2 + O2 → 2H2O

According to the balanced chemical EQUATION;


(2 * 2) = 4g of Hydrogen reacts with 32g of Oxygen.

So, 3G of Hydrogen will react with (3 * 32) / 4 = 24g of Oxygen.

Since, the amount of Oxygen given (29g) is more than the required amount of Oxygen (24g). Thus, oxygen is the EXCESS REAGENT and hydrogen is the limiting reagent. The amount of water formed will depend upon the amount of Hydrogen.

4g of Hydrogen produces (2 * 18) g of water.

So, 3g of Hydrogen produces (2 * 18 * 3) / 4 = 27g of water

The amount of Oxygen left un-reacted = 29g - 24g = 5g
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Electronic configuration N3- ION = 1s2 2s2 2p6

Atomic mass of N = 14g/mole

Therefore, number of moles of nitride ions in 4.2 G = 4.2/14

  = 0.3 moles

Therefore, number of nitride ions in 0.3 moles = 0.3 x 6.022 x 1023

Number of valence ELECTRONS in one nitride ion = 8

So, number of valence electrons in 0.3 x 6.022 x 1023 nitride ions = 8 x 0.3 x 6.022 x 1023

   = 14.45 x 1023

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A covalent bond, ALSO called a molecular bond, is a chemical bondthat involves the sharing of electron PAIRS between ATOMS. These electron pairs are known as shared pairs orbonding pairs, and the stable BALANCE of attractive and REPULSIVE forces between atoms, when they share electrons, is known as covalent bonding.

The CO2 has more MOLECULES.

your ANSWER of the QUESTION is B2Be3

Your ANS.. is -CHEMICAL COMPOSITION of the COMPONENT.

What is your QUESTION??????????

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Secondary SchoolChemistry 8+4 pts


Write a balanced chemical EQUATION to represent decomposition of lead nitrate on heating what are brown fumes due to
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Report by Horiadjayvarulajan 09.03.2017
Answers

MVB
MVB Samaritan
The equation is ----

Lead (II) nitrate → Lead (II) oxide + Nitrogen DIOXIDE + Oxygen

The balanced equation is----

2 PB(NO3)2 (s) → 2 PbO (s) + 4 NO2 (g) + O2 (g)


The chemical name of white salt is Lead nitrate Pb(NO3)2.

The salt on heating produces brown fumes. This is so because the salt contains nitrate ion. This salt can be any nitrate but if the RESIDUE left after heating is yellow in colour it definitely implies that the salt is lead nitrate.

Hope it helps!!!

CHEAP in production.

Easy to produce.

Easy to use.

Less Weight.

less in COST.

STP - 273 K
NTP - 273K
These are the two different STATES with different temperatures .
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HOPE THIS HELPS
THANK YOU :))

BECUASE chemical reaction TAKES PLACE bewteen NA2CO3 and HCL.

First, CONSIDER the chemical environment near the dissociating hydrogen: the hydrogen is a proton near the electron cloud around the oxygen. Now consider how the density of the electron cloud affects the hydrogen - oxygen bond: because the hydrogen nucleus is attracted to the electron cloud, a more dense electron cloud means a stronger hydrogen-oxygen bond (and thus, a weaker acid), while a less dense electron cloud means a weaker hydrogen-oxygen bond (and thus, a stronger acid). Now ONTO the problem:

In nitrobenzoic acid, the nitro group is quite electronegative and would naturally draw electrons away from the other atoms in the bond. In META nitro benzoic acid, the nitro group is CLOSER to the acid group than in para nitro benzoic acid, so the nitro group does a better job drawing electrons away from the acid group in meta nitro benzoic acid than in para nitro benzoic acid. Thus, the acid group in para nitro benzoic acid has higher electron cloud density than the acid group in meta nitro benzoic acid, and, by logic in the first paragraph, para nitro benzoic acid is the weaker acid.

,here is your ANSWER

Reductant => who LOST its electrons in the REDOX reaction.

Oxidant=> who gains electrons in the Redox reaction.
Example of this is RUSTING of IRON.
Fe+O2=> Fe2O3

Here Iron is a reductant and oxygen is a oxidant.

Because COPPER is more POWERFUL thanthe IRON

The burning of petrol is an EXTREMELY complex reaction that involves MANY steps and concepts, however, this answer can be broken down into more ELEMENTARY terms. For a chemical reaction to occur, the reactants must have a certain amount of energy. In this case, the energy necessary for petrol to BURN is rather high, and is not EASILY achieved at room temperature. Petrol does burn when exposed to a match, however, because the heat energy from the match provides enough energy for a small amount of the petrol to burn. But when that small amount of petrol burns, the energy released from the reaction heats up nearby molecules and causes those molecules to reaction, creating a chain reaction that quickly consumes the entire supply of petrol. Hope this helps!

The short ANSWER is, although NITROGEN has valency 3, it has 4 electron pairs around it, and it's the 4 electron pairs that allows it to form 4 bonds in the ammonium ion. A more detailed explanation is as follows:

I'll explain for the ammonium ion; the explanation for all other COMPOUNDS in which nitrogen forms four bonds follows ANALOGOUSLY:

First, consider the structure of NH3: the nitrogen has four electron pairs around it, three of which are shared pairs with hydrogen nuclei, and one of which is unshared. These electron pairs arrange themselves into an approximately tetrahedral shape, so that the hydrogens are on one side of the molecule and the nitrogen is on the other. This electron pair geometry exposes the unshared electron pair to the environment. If a hydrogen ion was in the environment, it would be attracted to the unshared electron pair and the attractive force between the hydrogen ion and the electrons would form a bond between the hydrogen ion and the nitrogen, so that the nitrogen has 4 hydrogens ATTACHED to it.

PF5 EXISTS but PH5 does not because of the FOLLOWING reasons -

H is  smaller in size  than F

PH5 is formed by the overlap of d orbitals with Sp3d HYBRIDISATION. 

F is more electronegative so Sp3d  hybridisation is possible but  H has LESSER electronegativity and can not form sp3d hybridization and PH5 cannot be formed.

When gases cool down they again CONVERT BACK into liquid STATE,this process is called condensation.

PAULING: ELECTRONEGATIVITY: the power of an atom in a molecule to attract ELECTRONS to itself.

Mulliken: Electronegativity is SIMPLY the average of the first ionization energy and electron affinity. Unlike Pauling Electronegativity, Mulliken's equations are absolute and need no starting reference point.

Hope it's useful

Answer  Friedel-Crafts ACYLATION of ANISOLE with ACETYL chloride and aluminium chloride as CATALYST is a standard laboratory procedure to synthesize acetanisole. The fact that this reaction is possible does not imply that there is no complex formation with AlCl3.

Explanation:

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good morning___________✌️✌️✌️

We are given that the compound contains 6.67% of hydrogen, 40 % of CARBON and rest oxygen.

Therefore ;

100 grams of the compound will contain 6.67 g of hydrogen,

40 g of carbon and

(100 - 40 - 6.67)g  = 53.33 g of oxygen.

Number of moles in 6.67g of hydrogen = mass of hydrogen / molar mass of hydrogen

= 6.67 / 1 = 6.67

Number of moles in 40g of carbon = 40 / 12 = 3.33

Number of moles in 53.33g of oxygen = 53.33 / 16 = 3.33

Now, we will calculate the simplest ratio of the elements by dividing the number of moles of each element by the smallest value,

that is 3.33.

Thus

we will get

Simplest ratio of elements =

C(3.33/3.33)H(6.67/3.33)O(3.33/3.33)

= CH2O

Thus the empirical formula of the substance is CH2O and therefore the empirical mass is 

= (molar mass of carbon + 2 X molar mass of hydrogen + molar mass of oxygen)

= (12 + 2 + 16)

= 30g

Now, we know that the volume of one mole of gas is 22.4 L or 22400 cm3. We are given that 0.6g of the gas weighs 224 cm3. Thus

 22400 cm3 of a gas = 1 mole

 1cm3  = (1/22400) moles

 224 cm3  = (224/22400) moles

 = 0.01 moles

This means that the mass of 0.01 moles of a gas is 0.6g. Now we also have the RELATION

 number of moles = mass of substance / molar mass of substance

 0.01 = 0.6 / molar mass of substance

 So molar mass of substance = 60g

Thus n = molar mass / empirical mass

= 60 / 30

= 2

So, the molecular formula of the substance will be (CH2O)2 = C2H4O2

Thanks and regards

Ajay
B.tech , IIT(BHU)Varanasi

It is because if the industrial WASTE DIRECTLY throwed out in the rivers it can cause harmful effects to the aquatic LIFE it MAY KILL the organism living in the rivers

Non metals reacts with OXYGEN in the AIR to produce metal OXIDE. Sulphur DIOXIDE nd nitrogen oxide dissolved in water in clouds nd RESPONSIBLE for acid rain which harms building.

2Na2S2O3+I2--Na2S406+2NaI
Thus the above EQUATION is BALANCED

Rutherford's Gold Foil Experiment PROVED the existance of a small massive CENTER to atoms, which would LATER be known as the nucleus of an atom. Ernest Rutherford, Hans Geiger and Ernest Marsden carried out their Gold Foil Experiment to OBSERVE the effect of alpha particles on matter.

It's a ORANGE COLOUR ACCORDING to me

I 50 molecule of z2
ii-1 MOL X +1 mol of y
iii-25 ATOMS of y
Iv-2.5 mol of x

The atom's CENTER, or NUCLEUS, is POSITIVELY CHARGED and the electrons that whirl around this nucleus are negatively charged, so they attract each other.

when a COMPOUND dissolves in water, it dissociates to form ions. The reaction between anhydrous COPPER(II) sulfate and water is used as a test for water. The white SOLID turns blue in the presence of water. The backward reaction is EXOTHERMIC - energy is TRANSFERRED to the surroundings when it happens.

Because it's CATCH FIRE quickly.


Hope it's HELP you FRIEND ☺️

Summer Ploughing" is defined as the ploughing the field across the slope during hot summer with the help of specialized tools with primary objective of opening of the soil crust accompanied by deep ploughing and simultaneously overturning of the soil underneath to disinfect it with the help of piercing sun rays. 

Perform deep summer ploughing (off season tillage) with pre-monsoon showers (during May) to recharge the soil profile. It facilitates to sow the crops immediately after onset of southwest monsoon. Off season tillage increases water content of soils and reduces runoff. It also reduces pest and weed infestation.

The number and depth of ploughing depends on weed intensity. At best two summer ploughings are done prior to advent of monsoon at an interval of 15-20 days. Third ploughing can be done once with the help of harrow or cultivator to pulverize the soil and prepare field beds for sowing/transplanting soon after the first monsoon rain.

Benefits of summer ploughing

The first and foremost benefit is that due to breaking of HARD crusted upper layer of the soil and deep ploughing the infiltration capacity and PERMEABILITY of the soil increases which increases in-situ moisture conservation. Consequently plant roots will get more moisture with less effort.
Summer ploughing improves soil STRUCTURE due to alternate drying and cooling.
Tillage improves soil aeration which helps in multiplication of micro-organisms. Organic matter docomposition is hastened resulting in higher nutrient availability to the plants.
Increased aeration also helps in degradation of herbicide and pesticide RESIDUES and harmful allelopathic chemicals exuded by root of previous crops and weeds (such as couch grass) which inhibit the growth of other near by plants.
Since the capacity to absorb rainwater increases atmospheric nitrate mixed with water enters the soil and it increases soil fertility.
Lot of insects and pests hibernate underneath the soil crust or stubbles during hot summer season. Due to overturning of the soil in summer ploughing the sharp rays of sun enters the soil and kills the eggs, larvae and pupae of soil borne insects and pests, thereby the hazards of insects and pests on subsequent crop is reduced. Consequently the farmer's expenditure in procuring insecticides and pesticides decreases.
A lot of harmful bacteria spores and fungal microbes die due to exposition to heat of summer. Farmers can get relief in purchasing fungicides and pesticides because of the inhibition of plant diseases due to summer ploughing.
. Plant parasitic nematodes are microscopic organisms, ubiquitous in nature, which remain hidden inside the soil and attack subsequent crops so much so that there is chances of total crop failure. Summer ploughing and crop rotation are important methods to control nematodes. Use of nematicides for nematode control is very rare due to their prohibitive costs while summer ploughing does it with free gift of nature.
Deep ploughing and overturning uproots the weeds. Consequently the roots and stems of the weeds get dessicated and die. As a result, weed control and less application of weedicides is one of the major advantage of summer ploughing As a result of it competition between the crops and weeds for same plant nutrients is reduced, there by the productivity increases.
Ploughing of field across the slope breaks the continuity of soil slope, there by reducing the soil carrying capacity of run off water. So water erosion of soil is restricted. More over the land surface is LEFT with clods, so that effect of wind erosion of nutritive soil particles is restricted.

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