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There is a carbon-carbonsigma bondand four carbon-hydrogensigma bonds. So ethene contains 1pi bondbetween the two carbon atoms and 5sigma bondsin total. There are 5sigma bonds(strong) and 1pi bond(weak) in ethene. There are 4 (C-H)bonds(sigma) and 1 (C-C)bond(sigma).The valency of carbon is 4.

Find long, flexible plant stems. These will form the main shape of the nest, and are much easier to work with than hard, short twigs. ...

Bend the stems into a loop. ...

Shape the rest of the nest. ...

Decorate with scavenged materials. ...

Place eggs inside

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ans: 1Structure of ClO3- is O- | O= Cl =OHere, hybridisation of Cl is 'sp2' which means it has one vacant p orbital.this implies that, it forms one out of two π bond by the vacant p orbital and the formation of other π bond includes d orbital

only 2 pie bonds are formed which are between d and p orbital

and there is no vacant p orbital there are only d vacant orbitals which chlorine is having

1. Ionic bonding. Because the cation ammonium (NH4) has a single electron in its valence shell, and Chlorine needs a single electron to fill its valence shell, it takes that one, and they stick together.2. It also consists of covalent bond present in Ammonium ion between Nitrogen and Hydrogen atoms and one co-ordinate bond between one hydrogen and nitrogen.

a) Carbons are the bad conductors of the electricity because the carbon atoms do not have any free electron which is in the conduction band.

They are not able to conduct in the room temperature so, if you increase the temperature of the room, then the electrons will start acquiring energy and will start contributing to the conduction.

b) Any cycloalkane can be the answer.Cyclopentane (C5H10) or cyclohexane (C6H12) are two examples.

All these have the general formula CnH2n.Since all the cycloalkanes contain single bonds, they are saturated.

a) Covalent bond are poor conductor of electricity because they are formed by sharing of electrons..they don't have a free electron that is required for electricity transfer thus they are bad conductors.. b) IUPAC name of CH3COCH3 is acetonealso known as propanone or dimethyl ketone

Carbon compounds are poor conductors of electricity as they form covalent bonds, so it does not give rise to free electrons ( all electrons are used in making the covalent bond) and as a carbon compound does not dissociate itself into ions, therefore carbon compounds are poor conductors of electricity.

Most of the carbon compounds do not conduct electricity because they have low melting and boiling points.Nature of bonding in carbon compounds is different from that observed in ionic compounds thus they are poor conductors of electricity.Bonding in carbon compounds does not involve the formation of ions which indicates the absence of ions in carbon compounds.So we can say that in carbon compounds, the bonding between carbon and other atoms is non-ionic in nature.

lactometer is the device used to measure purity of milk

The electronic configuration of Ni+2 = [Ar] 3d8

The electronic configuration pf Fe+3 = [Ar] 3d5.

So, as we know that half filled subshells are more stable,Thus we can see that Fe+3 ion will be more stable than Ni+2 , because of more number of exchanges in Half filled subshell.

The electronic configuration of Ni+2 = [Ar] 3d8

The electronic configuration pf Fe+3 = [Ar] 3d5.

So, as we know that half filled subshells are more stable,Thus we can see that Fe+3 ion will be more stable than Ni+2 , because of more number of exchanges in Half filled subshell.

Electronorbitalsthat have the same energy levels are calleddegenerate orbitals. When assigning electrons toorbitalsin determining electron configurations, the Aufbau principle states that lower energyorbitalsare filled before higher energyorbitals.

please specify the question that you wants to be answered

They are B. Producers

Ferromagnetismis the basic mechanism by which certain materials (such asiron) form permanent magnets, or are attracted to magnets.

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Mg reduces Al2O3at a temperature higher than 13500C . this temperature is so high that the process becomes economically unviable and technologically difficult . that is why it is not used in the reduction of alumina in the metallurgy of aluminium .

Inchemistry,isomersare ions ormoleculeswith identical formulas but distinct structures. Isomers do not necessarily share similar properties. Two main forms ofisomerismarestructural isomerism(or constitutional isomerism) andstereoisomerism(or spatial isomerism).In longeralkenechains, the additional carbon atoms are attached to each other by single covalent bonds. Each carbon atom is also attached to sufficient hydrogen atoms to produce a total of four single covalent bonds about itself. ... Forexample, thealkeneof molecular formula C4H8has twoisomers.Stereoisomers.

2,2 dimethyl ethanol

Mass of water in solution = (50 – 13.2) = 36.8 g

Solubility of NaCl = Mass of NaCl/Mass of water × 100 = 13.2/36.8 × 100=35.86



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Secondary School

In case of Pehal, 20% of sugar solution in which she added 20 g of sugar more.

Mass of sugar before addition to the solution = 20 g

Mass of sugar after addition to the solution = 20 +20 = 40 g

Mass of water in solution= 80 g

= Total mass of solution= 80 g + 40 g = 120 g

In case of Ishaan, 50% of sugar solution from which he evaporated 20 g of water.

Mass of sugar in solution = 50 g

Mass of water before evaporation= 50 g

Mass of water after evaporation = 50 g - 20 g = 30 g

 = Total mass of solution=50 g + 30 g = 80 g

After mixing both the solution

Total mass of sugar after the mixing of solutions,(M) = 40 g + 50 g = 90 g

Total mass of the final solution= =120 g + 80 g = 200 g

Mass percentage of sugar in final solution=

The concentration by mass of final solution is 45%

Blow up two balloons and attach a piece of string to each. Hold one balloon by the string in each hand and position the two balloons so that they are at your nose level and 6 inches apart. Blow hard into the space between the balloons. This lowers the air pressure. The pressure of the surrounding air is now higher and it will push the balloons together.

The process of waste paper recycling most often involves mixing used/old paper with water and chemicals to break it down. It is then chopped up and heated, which breaks it down further into strands of cellulose, a type of organic plant material; this resulting mixture is called pulp, or slurry. It is strained throughscreens, which remove any glue orplastic(especially fromplastic-coated paper) that may still be in the mixture then cleaned, de-inked, bleached, and mixed with water. Then it can be made into new recycled paper.

Can u also tell the major steps

Advantages of Biogas

1. Biogas is Eco-Friendly

Biogas is a renewable, as well as a clean, source of energy. Gas generated through biodigestion is non-polluting; it actually reduces greenhouse emissions (i.e. reduces the greenhouse effect). No combustion takes place in the process, meaning there is zero emission of greenhouse gasses to the atmosphere; therefore, using gas from waste as a form of energy is actually a great way to combat global warming.

Unsurprisingly, concern for the environment is a major reason why the use of biogas has become more widespread. Biogas plants significantly curb the greenhouse effect: the plants lower methane emissions by capturing this harmful gas and using it as fuel. Biogas generation helps cut reliance on the use of fossil fuels, such as oil and coal.

Another biogas advantage is that, unlike other types of renewable energies, the process is natural, not requiring energy for the generation process. In addition, the raw materials used in the production of biogas are renewable, as trees and crops will continue to grow. Manure, food scraps, and crop residue are raw materials that will always be available, which makes it a highly sustainable option.

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Air is a mixture of gases consisting of approximately 4/5 Nitrogen and 1/5 Oxygen so answer is both a and b

no of neutrons= atomic mass- no of protons =235-92 =143

Answer:A)1.44Explanation :

Double salts are salts containing more than one cation or anion, and are obtained by combination of two different salts which were crystallized in the same regular ionic lattice. Examples of double salts include alums or Tutton's salts.

a)Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. This is anexothermicreaction(oxidation rxn.)

b) Reaction type: single replacement

Thereactionbetween calcium oxide (CaO) and water (H2O) to form calcium hydroxideCa(OH)2is an exothermic combinationreaction.

Only A is alkaline because alkaline means a base in aquas form

So here you go.

a)X is weakly acidic as it gives orange colour.Y is Weakly basic as it gives bluish green.

b)pH of X=3-6.pH of Y=7-9.

Combination bands describes weak absorptions in IR spectra corresponding to the sum of two or more fundamental vibrational frequencies. These combination modes arise from the anharmonicities of the oscillators which leads to an interaction of the vibrational states in polyatomic molecules.

1)CuO undergoes reduction as it is removal of oxygenand H2 undergoes oxidation as it has addition of oxygenCaCO3(calcium carbonate) is reduced in industries to get CaO and CO2. Calcium oxide is used in the manufacture of cement.

But HCL contain H+ ions .

Here we are talking about dry HCL

Dry HCL contain H+ ions but here H+ ions does not dissociate in dry HCL .

because it can not release h+ ions so dry HCl do not change the colour of litmus paper m

The solid baking soda does not change colour of dry litmus paper because in solid states ions are not free to move. And solution of baking soda in water leads to change in the colour of dry litmus paper because in water baking soda dissociate into ions and ions leads to change in colour of litmus paper.

Bluelitmus paperturns red under acidic conditions and redlitmus paperturns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). Neutrallitmus paperis purple.

The ions fromKClderive from a strong acid (HCl) and a strong base (KOH). Therefore, neither ion will affect the acidity of thesolution, soKClis aneutralsalt.

Litmus solution is apurpledye, which is extracted from Lichen, a plant belonging to division Thallophyta and is commonly used as an acid-base indicator.

efflorescence is the correct answer