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rth shell has 4 SUBSHELLS: the subshell, which has 1 orbital with 2 ELECTRONS, the subshell,

acid = concentration of more H+ ionsweak base= LOW concentration of OH- ions

ater the electronegativity DIFFERENCE, the more ionic the bond is. Bonds that are partly ionic are called polar covalent bonds. Nonpolar covalent bonds, with EQUAL sharing of the bond ELECTRONS, arise when the electronegativities of the two ATOMS are equal.

s a piece of calcium float when put in WATER ?The reaction of calcium with water is not very violent. SO, the heat RELEASED is not sufficient for the hydrogen to catch fire. Calcium starts floating because the bubbles of hydrogen gas which are formed during the reaction STICK to the surface of the metal and hence caclium floats on water.Does magnesium react with cold water, why or why not ?Very clean magnesium ribbon has a very slight reaction with cold water.Hope this helped youPlease mark the brainliest

tion of standard solution of oxalic acid [ 250ml / 0.1M ] we know, molar mass of oxalic acid ,  = 126g/mol GIVEN, molarity = 0.1Mand volume of solution , V = 250mlso, mass of oxalic acid = M × molarity × V/1000= 126 × 0.1 × 250/1000 = 126 × 0.1/4 = 3.15 g now, determination of strength of  using standard solution of oxalic acid. in this titration, potassium permanganate is titrant while oxalic acid is ANALYTE. also we observed that potassium permanganate is oxidising agent. and oxalic acid is reducing agent.The reaction between potassium permanganate and oxalic acid is carried out in an acidic medium because permanganate ion in the acidic medium is a very strong oxidizing agent. Acidity is introduced by adding dilute sulphuric acid.The chemical reaction that takes place during titration can be represented by the chemical equation.molecular reaction, -------------------------------------------------------- is overall reaction. ionic reaction, --------------------------------------------------------------- overall ionic redox reaction. from balance chemical equation, it is clear that two mole of potassium permanganate reacts with five moles of oxalic acid. according to molarity concepts , molarity of  × volume of  /molarity of oxalic acid × volume of oxalic acid = mole of /mole of oxalic acid = 2/5 so, molarity of  = molarity of oxalic acid × volume of oxalic acid × 2/volume of  × 5If oxalic acid is to be titrated, add the required amount of DIL. sulphuric acid and HEAT the flask to 60°-70°C. The purpose of heating is to increase the rate of reaction, which otherwise is slow at room temperature.

A strategic metal is basically a metal or mineral element that is important for some kind of INDUSTRIAL process or other USE. Rare earth METALS zinc, COPPER, silver, lead , silicon, titanium and CHROMIUM.

ve are the MERITS and DEMERITS of medeleev'periodic table

ctron pair which forms a bond between TWO SIMILAR non-metallic atoms will be covalent bond.Hope it HELP.

sium is the ANSWER

salt. A salt that crystallizes from an AQUEOUS solution of a mixture of two different ions. The mineral dolomite (CaMg(CO 3)2), for example, is a double salt that crystallizes from a solution CONTAINING both calcium and MAGNESIUM ions. Double salts exist only as solids.

e earth metals have only two electrons in their outermost shell.Alkaline earth metals have RELATIVELY LOW ionization energies for their first two electrons; because of this, alkaline earth metals exist with a 2+ charge most of the time.When alkaline earth metal oxides are placed in water, the RESULTING product is basic.Alkaline earth metals react with nonmetals to form ionic compounds. They are Not found FREELY in nature.They have High boiling points.And High melting points.Low density.Hope it HELPS

y Any one cation and anion from the following given salt.(a)CaCO3 (b)BaCl2 (c)ZnS (d)Pb(NO3)2 (e)FeCl3 1.physical characteristic,2.dry and wet test for cation ,3.dry and wet test for anion ,4.confirmatory test for cation and anionHere we take calcium carbonate to identify of cation and anion. You can use other ones .(a) Identification of cation in CaCO3 : here Calcium is cation and carbonate is anion. calcium present in fifth group.Solution of the fifth group precipitate in acetic acid gives a white precipitate with ammonium oxalate solution.CaCO3 + 2CH3COOH ---> (CH3COO)2 Ca + H2O + CO2 (CH3COO)2Ca + (NH4)2C2O4 ----> (COO)2Ca + 2CH3COONH4Here, (NH4)2C2O4 is ammonium oxalate and (COO)2Ca is white precipitation of calcium oxalate. flame test : Calcium imparts brick red colour to the flame which looks greenish-yellow through blue glass.Identification of anion in CaCO3 : CO3²-, (carbonate ) is anion in the presence of calcium carbonate. If there is effervescence with the evolution of a COLOURLESS and odourless gas on adding dil. H2SO4 to the SOLID salt, this indicates the presence of carbonate ion. The gas TURNS lime water milky due to the formation of CaCO3.Na2CO3 + H2SO4 ---> Na2SO4 + H2O +CO2Ca(OH)2 + CO2 ----> CaCO3 + H2OIf CO2 gas is passed in excess through lime water, the MILKINESS produced disappears due to the formation of calcium HYDROGEN carbonate which is soluble in water.CaCO3 + CO2 + H2O-----> Ca(HCO3)2

your answerHope it HELPS

isode 13 Tamil so you know the right choice of this money VISA LIKE green pink YELLOW mix and classic colour and FANTASTIC look like classical colours and fantastic looking like BEAUTIFUL minus 1 by 2 + 3 by 106 0.60

ces which ALTER the rate of a chemical reaction without themselves GETTING changed are called as catalysts. The amount of catalyst used for any particular reaction is generally very small as compared to that of the reactants. We have two types of catalysts namely positive catalyst which increases the rate of a reaction and negative catalyst which decreases the rate of a reaction. In a number of chemical reactions, transition metals and their oxides are used as catalysts. Transition metals such as iron, cobalt, NICKEL, platinum, chromium, manganese and their compounds are the common catalysts used in various industries these days. An image of transition metals in the periodic table is given below: Catalyst Explanation for behavior of catalyst Transition metals show catalytic behavior mainly due to the following reasons: The presence of vacant d orbitals. They have the ability to exhibit variable valencies. They have a tendency to form complex compounds. Transition metals form unstable intermediates with their reactants as they have a tendency to exhibit variable valency and form complexes. The unstable intermediate formed during the reaction provides an alternative path having lower activation energy for the reaction. The lowering of activation energy increases the rate of the reaction. Later these unstable intermediates decompose in order to give final product and the catalyst is regenerated towards the end of the reaction.  In many cases finely divided catalysts are used as they can provide a greater surface area for the reaction to take place. This large surface area actually provides free valencies through which the reactant molecules get absorbed on the surface. A large surface are facilitates more reactant molecules to move closer and get combined and hence the rate of reaction is increased Applications Catalysts find application in ALMOST all the reactions that are used in industries for commercial purposes. Following are some of the reactions where catalysts are used: In hydrogenation reactions we use finely divided nickel as catalyst. The catalyst is mainly used for hydrogenating oil in order to manufacture vegetable ghee. In the synthesis of ammonia by Haber’s process finely divided iron is used as catalyst. V2O5 is used in the MANUFACTURING of H2SO4 by Contact process. TiCl4 is used in the manufacturing of high density polythene.

saturated HYDROCARBONS burnwith blue flame and unsaturated burnwith a suthe flame? Ans: It depends on Carbon to HYDROGEN ratio. The molecules which contains alomsot equal number of Carbon and hydrogens will burns with sooty flamehope it helps you PLZ MARK as branliest

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alides (ALSO KNOWN as HALOALKANES) are compounds in which one or more hydrogen atoms in an alkane have been replaced by halogen atoms (fluorine, chlorine, bromine or iodine). Alkyl halides fall into different classes DEPENDING on how the halogen atom is positioned on the chain of carbon atoms; there are some chemical differences  between the various types.HOPE IT WILL HELP UHPLS MARK ME AS BRAINLIST

that one gram of hydrogen reacts with oxygen is equal to 8 gramtherefore 3 gram of hydrogen reacts with oxygen is equal to 8 into 3 is equal to 24 gramcars 24 gram of Oxygen GAS WOULD be REQUIRED to react completely with 3 gram of hydrogen gasplease mark it as brilliant

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tal ROW of PERIODIC table is called periodElements with atomic number11 to 18 BELONGS to 3rd period of periodic tableHOPE THIS WILL HELP YOU

's CLEAR..........

der name is baking powder.it is an EDIBLE acid LIKE tartaric acidCa(OH)2+Cl2------->CaOCl2+H2O

necobalt(III) Hexacyanochromate(III)it is an example of COORDINATION isomers in which NH3 LIGAND are bond to Co(+3) and CN(-1) ligand to Cr(+3)please MARK it as brilliant

no. of electrons in OUTERMOST shell are five. For BECOMING stable, it can! GAIN 3 electrons to comp. 8 electrons in outermost shell or! loose 5 electrons.Bt loosing 5 electrons will take so much energy as compared to gain 3 electrons. So, it will gain 3 electrons.So VALENCY of element = -3Hope it may HELP u....

on is a growing issue in the world and is the major cause that contributes to many environmental problems. What is usually classified as pollution, what kind of pollution is present in the world, and what the people are doing to deal with this pollution issue in the world. There are SEVERAL problems with world pollution that are associated with global warming and include waste disposal, water pollution, and air pollution. These things are usually caused by people on the planet who produce waste. This has been a growing complication and is (omit) now been taken as a serious issue. Solutions to these situations have been considered to keep the Earth and all the things in it.One of the situations that are involved with world“The problem of exposure to hazardous materials remains, except that it is spread over a wider area” (Newton). Illegal waste disposal is also another reason that contributes to world pollution. It may be defined as the improper disposal of waste at any site other than a regularly licensed landfill or other facility. Usually this kind of disposal is done because people are unaware of the law and are unwilling to take the time or refuse to pay the costs for properly disposing materials, or are in possession of TOXIC materials that may cause legal problems. (Watts) “Illegal waste dumping RANGES from being a simple nuisance to a serious health hazard and often occur in isolated or desolate places. In the United States, illegal waste dumping is often THOUGHT of as a local problem; however, the motives and types of people who engage in it—including multinational corporations, criminal syndicates, and individuals—persist throughout the world” (Watts). The DANGERS of disposing of waste illegally are often unknown by some corporations or even ignored. By not getting rid of waste properly it encourages more dumping, so a small problem may rapidly become a major hazard.

he equation C3H8+5O2⟶3CO2+4H2OCX3HX8+5OX2⟶3COX2+4HX2O and that enthalpies of formation for H2O(l)HX2O(l) is −285.3 kJ/mol−285.3 kJ/mol and CO2(g)COX2(g) is −393.5 kJ/mol−393.5 kJ/mol, and the ENTHALPY of COMBUSTION for the reaction is −2220.1 kJ/mol−2220.1 kJ/mol, I need to FIND the heat of formation of propane.My initial idea was to USE Hess's law, and I got[3(−393.5)+4(−285.3)]−[−2220.1]=−101.6 kJ[3(−393.5)+4(−285.3)]−[−2220.1]=−101.6 kJI then doubted myself because Hess's law gives the ΔHorxnΔHrxno which is different from the ΔHofΔHfo forC3H8CX3HX8 that we are trying to find.So I used another APPROACH using the individual equations for the formation of H2O,CO2HX2O,COX2, and C3H8+5H2O⟶3CO2+4H2OCX3HX8+5HX2O⟶3COX2+4HX2O and combining the equations to get the equation for the formation of C3H8CX3HX8 (which is 3C+4H2⟶C3H83C+4HX2⟶CX3HX8). After manipulating the equations, I got +2220.1−1141.2−1180.5=−101.6 kJ

proton 9 no. of NEUTRON 10no. of ELECTRON 9 so atomic mass is 18.998 at mass UNIT.

s have an UNPAIRED electron that is present in the outermost shell (valence shell) of the atom. When photons (light particles) of suitable energy HIT the atom, the electron gets excited and moves to HIGHER energy STATES in the atom.hope it will helps you FRIEND

Bhabha RD, Ward No. 8, NCL COLONY, Pashan, Pune, Maharashtra 411008

g point of colloidal SOLUTION is lower than TRUE solution at same CONCENTRATION of a solute.

argon=40gmass of 10^25 MOLES of argon=40×10^25 =40×10^25g

ms IA a type of test that can used differentiate between ethanol and methanol --when ethanol is warmed with lodine in the PRESENCE of NAOH it forms of yellow colored precipitate.Methanol on the other hand does react positively to lodoforms test I hope this ANSWER will be helpful..

्यक्ति औसत वार्षिक कार्बन डाइऑक्साइड उत्सर्जन, वे 20 मीट्रिक टन थे, जो कि विश्व औसत चार टन की तुलना में था। लेकिन "मंजिल" जिसके नीचे यू.एस. में कोई भी नहीं पहुंच सकता है, किसी भी व्यक्ति की ऊर्जा पसंद नहीं है, 8.5 टन निकला, वर्ग मिला।

iodination of benzene is not possible because the reaction is reversible and the HI so produced in the reaction is a very strong reducing agent which reduces iodobenzene back to benzene.C₆H₆ + I₂   ⇄  C₆H₅I + HIHence this reaction is carried out in presence of strong oxidising agent LIKE IODIC acid or nitric acid which oxidizes the HI formed to iodine for the reaction to MOVE forward.5HI + HIO₃ -------> 3H₂O + 3I₂

e...Here is your CORRECT ANSWER.....Hope this will help you.....Calcium bicarbonate and magnesium bicarbonate ...... are the TWO salts of calcium and magnesium which makes the water hard...... Don't forget to mark as a brainliest....PLZZ plzz plzz plzz plzz☃️☃️...

the ORDER of reaction?i THINK it's 1ST order, so the ANSWER would be0.693 / K = 480Hence, k = 0.00144375or, k = 1.44 x

h PH3 is a larger molecule with greater dispersion forces than AMMONIA, NH3 has very polar N-H BONDS leading to strong hydrogen BONDING. This the dominant intermolecular force and RESULTS in a greater attraction between NH3molecules than there is between PH3molecules