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Explanation:Reaction of aluminium with HCl and Naoh.both the reaction gives RISE to SALT and water

ear advantages to natural gas are as follows: Natural gas is environmentally friendly because it BURNS cleaner than other fossil fuels. It's safer and easier to STORE when compared to other fossil fuels. Natural gas is extremely RELIABLE, UNLIKE electric power that can be knocked out during a storm.itzDopeGirl

all are not EQUAL because they are not the same ELEMENTS

C.Protons and NeutronsHope it HELPS you.Plz MARK me down the BRAINLIEST plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

X=pbcl2+y=cuExplanation:

i'm not surepotassium carbonstemanaganese borate SODIUM  hexa cyano ferrate(2)SILVER sulphitesodium silicateExplanation:

s of SUBLIMATION: "DRY ice" or SOLID CARBON dioxide sublimes.itzDopeGirl

Brainly.inWhat is your question?1boorgalavinay253908.09.2018ScienceSecondary School+5 ptsAnsweredExplain the preparation of PLASTER of Paris with the help of balanced chemical equation2SEE ANSWERSLog in to add commentAnswers chandraprakash05chandraprakash05 ExpertWhen the gypsum is heated on 373°k it convert into plaster of Paris CaSO4. 2H2O +energy 373°k =CaSO4. 1/2H2O+3/2H2OAnswer by cp4.834 votesTHANKS 60Comments Report prmkulk1978prmkulk1978 AcePlaster of Paris is also known as Calcium SULPHATE hemihydrated salt with chemical formula CaSO4.1/2H2OPreparation METHOD :Plaster of Paris is prepared from gypsum.Gypsum is heated to a TEMPERATURE of 100⁰c . It looses 3/ 4th of its water ofcrystallization and forms Plaster of Paris.Balanced Chemical equation:CaSO4.2H2O-----> CaSO4 .1/2H2O + 3/2 H2O

FE2o+C_a+bBALANCE THE EQUATION

fe304+H2 it is the RIGHT ANSWER

what do you MEAN by this QUESTION

x is glucoseExplanation:12thChemistrySolutionsVapour Pressure of Liquid SolutionsThe VAPOUR pressure of 100 ...CHEMISTRYThe vapour pressure of 100 g water reduces from 3000 NM −2 to 2985 Nm −2 when 5g of substance X is dissolved in it. The substance X is :October 15, 2019avatarShamil SisangiaShareSaveVIDEO EXPLANATIONANSWERRaoult's law states that relative lowering of vapour pressure and is EQUAL tothe mole FRACTION of the solute.p 1 p 10 −p 1 =x 2 p 10 =3000 Nm −2 = vapour pressure of solution.p 1 =2985 Nm −2 = vapour pressure of sollvent.x 2 = mole-fraction of solute.Let molecular wt. of X is x.No of moles of X is x5 No of moles of solvent is 18100 .Mole-fraction of X is (100/18)(5/x) =9/10xSo,30003000−2985 = 109 x⟹x=180The molecular weight of glucose is 180 g/mol.

ion of but-1-ene to but-2-ene is by CATALYTIC ISOMERISATION. But-1-ene undergoes isomerisation to but-2-ene on a nickel CATALYST in the presence of HYDROGEN atoms. CH3CH2CHBRCH3. We then add alcoholic KOH to get but-2-ene.

The cleansing action of both SOAPS and DETERGENTS results from their ability to lower the surface tension of WATER, to emulsify oil or grease and to hold them in a SUSPENSION in water. This ability is due to the structure of soaps and detergents. In water, a sodium soap dissolves to form soap anions and sodium cations.

potential formula isEcell = E° −  0.0591 LOG [H₂]                        1         [H⁺]⇒ for  [H⁺]                          pH = 10 so,                           or  [H⁺] = 10∧⁻pHpH = − log [H⁺]                            pH = 10  so [H⁺] = 10⁻¹⁰                            [H⁺] = 10⁻¹⁰ ⇒ E° = 0⇒ [H₂] = 1 [1 atm]Ecell = E° −  0.0591 log [H₂]                        1         [H⁺]        = 0 −  0.0591 log   [1]                        1         [10⁻¹⁰ ]        = −  0.0591 (log 10¹⁰)        = −  0.0591 (10 log 10)        = −  0.0591 (10 * 1)      {log 10 =1}        = −  0.0591 x 10 Ecell = − 0.59 V

s no MOLAR MASS of CL ATOM is 35.5 ..... the molar mass of MOLECULE(Cl) is there i.e. 70.9

is PARAMAGNETIC

test the presence of nitrogen gas present in packet of CHIPS and other snacks. MATERIAL REQUIRED: Match box, CANDLE, Packet of chips. PROCEDURE: 1. Take a burning candle or burning matchstick. 2. OPEN packet of chips near to the flame of candle or burning matchstick. 3. RECORD your observation. OBSERVATION: The matchstick or candle will get EXTINGUISHED. BASIC PRINCIPLE INVOLVED: The packet of chips and many other products have nitrogen gas in it, which prevents spoilage of food due to oxidation because nitrogen is very less reactive. CONCLUSION: Presence of nitrogen is tested and understood the method of preserving food stuff. PRECAUTION: To be done under parental supervision.

V1 / T1 =  P2   V2 / T2   - Ideal gas law      V2 =   P1  V1  T2 / (T1  P2)              =  380 mm * 1 Litre * 288 K / [ 303 K  * 750 mm ]2.    P V = n R T          ideal gas law      n = R T / (P  V )  =  8.314 * (273+550) / [ 0.2 * 1.013 *10^5  * 0.350)         n =  m / M        =>          M =  m / n  =   0.05 / n 3.    P V = n R T = m R T / M       M =  m R  T / [ P V ]  = d  R T / P,    d = density            = 1.5 * 10^-3 * 8.314 * (273+65) / [750 * 1.013 * 10^5 / 760 ]            = 1.5 * 10^-3 * 8.314 * (273+65) * 760 / [750 * 1.013 * 10^5  ]4.  which conditions ?  where are they?5.open vessel   pressure P and V volume of gas remain constant.T1 = 300 K.     P1=P ,      V1 = V,     n1 = MOLES present               P  V = n1 R T1P    and V2 = V,        n2   <  n1          T2 > T1            P  V =  n2  R  T2,          n2 moles of gas remains after heating         n2 T2 = n1 T1          n2 =  (1-3/5) n1 = 2/5 * n1           =>   T2 / T1 = n1/n2 = 5/2 = 2.5          T2 = 300K * 2.5 = 750 K  ,   at this temperature only 2/5th of initial gas is present.a)  If the vessel now is heated to  T3 = 900 K, then         n3 / n1 = T1 / T3 = 1/3           =>  only 1/3 is present.  and  2/3 of air escapes out.b)  let       n4 /n1 = 1/2        n4/n1 = T1/ T4     =>   T4 = 600K====================6.V = 10L =  0.01 m^2        T = 300Kp  = m R T / (MV)p_He = 0.4  8.314 * 300 / (4 * 0.01 )     Pap_O2 = 1.6 * 8.314 * 300 / (32 * 0.01)   Pap_N2  = 1.4 * 8.314 * 300 / (28 * 0.01)  Paadd the three. to get total pressure.P = 8.314 * 300 [ 0.4/4 + 1.6 /32 + 1.4/28 ] / 0.01  ====================7.   one of N2 gas =  N = avogadro num = 6.023 * 10^23 number of molecules. volume of each MOLECULE =  4/3   Pi  r^3,        r = 2 * 10^-10 mvolume of gas at NTP,  22.4 litres = 0.0224    m^3empty space =      0.0224  -  6.023 * 10^23 * 4/3  pi   2^3   10^-30  8.P_A = 2 P_B              V_A = 2 V_B               T_A = 2 T_BP V / RT = n   =>      n_A  / n_B  =   2      =>   m_A = 2  m_B===========9.m1 = 5.40 gm        T1 = 300 K              V1 = V           P1 = Pm2 = 0.14 gm     M2 = 2        n2 = 0.07            T2 = 290 K          V2 = V         P2 = Pn1 T1  =  n2  T2     =>    n1 = 0.07 * 290 / 300     M =   m1 / n1=======================10.          P ,    d = m / V1         T1 = 300 K            P =  d R T / M        =>         d1 T1 = d2 T2                          0.75 d / d =  300 / T2          => 400 K======11V = 1 litre       P = 1 atm     T = 373 Knum of moles in STEAM:      n2 = P V / R T  = 3.381 * 10^-6  mass of this 1 litre of vapour  at 373 K,   m2 = density * Volume        =>  m2 = 0.0006 g/cc * 1000 cc =  0.6 gmsIn liquid FORM,   the water molecules weighing  0.6 gms  occupy  0.6 cc.If we assume that in water , the molecules are very CLOSELY packed (as compared to the gas vapor), then    the volume occupied by water molecules is 0.6 cc   in one litre (1000 cc) of the water vapour  at 1 atm at 373 K.

P2 / P1 =  T2/ T1           10^6  / 0.25 * 10^6  =  T2 / 300 K         => T2 = 1200 K       It will  blow up at  1200 K============3.       P1 = 5 atm      T1 = 303 K          V1          n1      m1               P1  V1 =  n1  R T1     T2  = 293 K,       n1,   m1 same     V2  = 160% V1 = 1.6 V1           =>    P2 =  P1 /1.6     n3 =  n1 * 120%  = 1.2 n1            V3 = V2 = 1.6 V1     T3 = ?        P3 =  P1       P3 V3 / [P1 V1 ] =  n3 R T3 / [ n1 R T1 ]       1.6 = 1.2 * T3 / 303         T3 =  1.6 / 1.2 *    303 K========================4.I think there is a misprint in the number :  10 deg C  increase in temperature or  10% increase in pressure....    Increase of 10 deg. C  cannot increase pressure by 10%.m = 12 gm          T1 = 273+t deg K          V1 = v litre        P1 = 1 atmM = 120        => n = 0.1  number of molesif the increase of temperature is:  100 deg C   T2 = 373+t  deg K            V2 = v litre        P2 = 1.10  atm       P2/P1 = T2 / T1      =>     1.10 (273 + t) = 373 + t               =>    t = 10 *  72.7  =  727 deg Cif the increase of pressure is 1 % only and increase of temperature is 10 degC,             P2/P1 = 1.01 = 283+t  / (273+t)                   t = 727 deg  C=================================then CALCULATE V as:          v  = n *  R (273+t)  / P1          as all quantities are known

prove  vibrating spoon can sound like a bell.Apparatus Required :             1.Two spoons             2. String.Procedure :  ---> Tie a spoon in the middle of the string             ----> And hold the ends of the string with the INDEX fingers and  bring it close to ears.             ---> Ask your friend to hit gently the spoon with another spoon.Observation:             If we listen carefully , we hear the sound which resembles like a  bell LASTING for a while.Conclusion:    Sound is PRODUCED by Vibrating Bodies. Sound travels faster in solid medium

ng  to  PLANK's quantum theory, hypothesis, and radiation law:1.    False.  Energy is emitted by a vibrating PARTICLE only when it changes from one energy state to another.    2.  true.  energy is propagated in the form of radiation or photons with energy = h ν,  where ν is the frequency of the emitted wave3.  False.    According to Plank's quantum theory, energy states of the particle oscillating,  energy emitted and energy absorbed are all in discrete multiples of a quanta =  h ν.    A fraction of this quantum is not possible to emit/absorb.4.  True.  It has been OBSERVED that  BLACK body radiant energy at the same temperature, first increases with wavelength to a maximum and then it decreases.

state of MATTER MEANS when any matter  is in the FORM of GAS  or vapours called the GASEOUS state of matter .like  the gaseous from of water  is water vapours .

tial PRESSURE of gas is a MEASURE of the concentration of a gas in a MIXTURE of GASES........

o because the smell of hot FOOD is hot and hotness is TREATED as energy so smells particle GETS energy and travel a large distance and shows their PROPERTY of fluidity and CREAT randomness.and cold food 's smell doesnot posses much energy as hot food's smell.hence it don't travel much distance.

rrange N resistors of value R ohms in series, the effective RESISTANCE:     n R ohmsif we arrange n resistors of value R ohms in parallel, then the effective resistance:    R / n ohmsfor getting effective resistance of 4 ohms from 6 ohm resistors, we can PUT two resistors in series, and their equivalent resistance = 12 ohms.  Then CONNECT the third resistance of 6 ohms in parallel.      equivalent resistance = 12 * 6 /(12+6) = 4 ohms.=============if we connect two resistors in parallel then effective resistance = 6/2 = 3 ohms.We connect the third resistance in series.  The effective resistance: 3 + 6 = 9 ohms

fill fixed volume of GAS in a TIRE tube because the tube has its own flexibility if you fill more amount of AIR or any gas for that matter it can STRETCH to only a certain extent . And if you fill more than that the pressure will increase and eventually it will blast off.

etals that can be used for making coin is called coinage METAL,generally coinage METALS are least reactive for example gold coin and SILVER coin etc

point of alcohol = 351 °Kboiling point of water = 373 °KHigher boiling point means that more kinetic energy is needed by the MOLECULES in the liquid state to go into the vapor state.  That means that the bonds between the molecules of water are more than the bonds between the molecules of Alcohol.Since Alcohol molecules have less cohesive FORCES, they escape into gaseous state much more RAPIDLY, when same amount of heat is supplied to both liquids.Also due to the smaller cohesive force, the latent heat of vaporization of ETHYL Alcohol: 841 kJ/kg.  and  that of water = 2, 260 kJ/kgSince less latent heat is required, Alcohol VAPORIZES much more rapidly than water

law:Molecular mass of carbon dioxide = 12+2*16=44Mass of CO₂ dissolving in 500 ml of WATER at a PRESSURE of 2.5 atm at 298 °K =            44 * 0.758 * 10⁻³ = 33.352 MG.

are a vegetarian, please don't eat EGG. It is not veg food. The PEOPLE who are calling themselves vegetarian now infront of OTHERS, are not able to RESIST the taste of egg. So they are eating it and telling it a veg food. They are saying that there is no fertilisation. So there is no animal in it. But all these are base less reasons. They just don't wanna feel bad ABUOT  what they are doing.

as are present in 18th group in periodic table. And all NOBLE gases are inert in nature because their all shell are FULL FIELD with electron. this is special cheractristics of noble gases. This chemical series of noble gases are HELIUM(He), neon(Ne), argon(Ag), krypton (k), xenon(Xe), and radon(Rn).

law states that : where p = partial pressure of the gas above the SOLUTION.   is the Henry's SOLUBILITY CONSTANT for the solvent & solute at GIVEN T°C    c = molar concentration  of the solute in the solution in  moles/Litre  at given T°C     c = m / V ,    m = MASS of the gas  and  V = volume of the solventSo solubility of directly proportional to the partial pressure of the gas over the  solution.  Since solubility is directly proportional to the mass of the gas solute, the mass dissolved is directly proportional to the partial pressure. p1 = 1 bar              m1  = 6.56 * 10⁻² gm p2  = ?                  m2 =  5 * 10⁻²  gmThe partial pressure is less than 1 bar which is for saturated solution.

ressure of air above WATER = P = 10 atm.partial PRESSURE of O2 in air above water  = P1partial pressure of N2 above water = P2Volume of air above water = VVolume of O2 = V1 = 0.20 VVolume of N2 = V2 = 0.79 Vlet n1 moles of OXYGEN and n2 moles of N2 be present in air in volume V.Let n  = total number of moles of gases in airFrom Daltons' law of partial pressures and the law of ideal gas mixture:             Henry's law for solubility :      where  p = partial presssure of the gas above the liquid in equilibrium with solution       Henry's constant     c = molar concentration of the gas in moles/Litre in the solution           c1 = concentration of O2 in water     = mol/Litre     = 4.606 * 32 * 10⁻⁵ gm/Litre = 1.474 mg/kg of water     =  0.1474 % of water by mass  or  8.291 * 10⁻⁵  moles/100 moles of waterc2 = concentration of N2 in water   = mol/Litre   = 2.582 mg/Litre = 0.2582 % of water by mass  = 16.6*  10⁻⁵ moles/100 moles of water

ich has been SUBJECTED to the action of heat,of STRONG  nitric acid,CHLORINE,ETC.