Shenaya

Most popular questions and responses by Shenaya
  1. Inorganic Chemistry

    Can Cu2+ oxidize 1) SO2 2) C2O4(2-) Does this happens also when the solution is basic? Cu2+ + H2S ---> CuS + H2

    asked on June 14, 2017
  2. Chemistry

    1)In the reaction O2+2F2--> 2 OF2, F2 is the oxidizer. 2)F can't have positive oxidation states. Does 2 explains the reason for the 1st one or is it because because of F's higher electronegativity?

    asked on July 31, 2017
  3. Chemistry

    We have been thought that BaC2O4 is a precipitate when dissolved in H2O. When comparing its solubilty in water and in an aqueous acidic solution,what is the reason for its higher solubility in an aqueous acidic solution than water?

    asked on July 9, 2017
  4. Inorganic Chemistry

    What will happen if we add Mg powder to a (NH4)2SO4(aq) solution? What would be the products?

    asked on June 19, 2017
  5. Can't submit follow up questions or thank the tutor

    I can't submit a follow up question or thank the tutor after an answer or a response is posted by a tutor,as the "post answer" button not available in the bottom of the form,as it used to be. I tried reopening,refreshing the browser and switching the

    asked on July 30, 2017
  6. Organic Chemistry

    Does Ethanoyl Chloride gives out a white precipitate with aqueous AgNO3? We've been thought that an acid chloride gives out the relative Carboxylic acid with water.So in the same way can we take that Ethanoyl Chloride reacts with the water in this aqueous

    asked on July 11, 2017
  7. Math

    The equation 2x^2+2y^2+x+4y+2c=0 represents a circle.(let's name it S1) 1)Find the values of a,b and and show that c

    asked on July 31, 2017
  8. Mathematics-Integration

    Question: Prove that [integrate {x*sin2x*sin[π/2*cos x]} dx] /(2x-π) } from (0-π) = [ integrate {sin x*cos x*sin[π/2*cos x} dx ] from (0-π). My thoughts on the question: We know that integrate f(x) dx from (0-a) = integrate f(a-x) dx from (0-a) From

    asked on June 8, 2017
  9. Chemistry

    Question: A solution of H2X of unknown concentration is given. pH of the solution is 4. ka1=2*(10)^-6 M ka2=1*(10)^-11 M Find the concentrations of [H2X] ,[HX-] and X^2- in the solution. My thoughts on the question: The temperature which the solution is

    asked on May 31, 2017
  10. Mathematics -binomial theorem

    How do we find the value of(1.01)^5 approximately up to three decimals,only with the use of the Binomial theorem?

    asked on May 24, 2017
  11. Chemistry

    Question : State whether the following are true or false. SO2 gas changes the colour of a KMnO4(aq) solution They have taken this as false and given the following equation: SO2+H2O+2KMnO4-->K2SO4+MnSO4+H2SO4 (not balanced) But why they have taken this as

    asked on July 29, 2017
  12. Organic Chemistry

    What will happen from the following if H3C-C6H6-N2Cl is treated with Na2CO3? a)CO2 will emit 2)NH3(g) will emit c)N2Cl-C6H6-CH3 will be produced d) NH2-C6H6-CH3 will be produced We get C6H6-NH2 when Sn/conc.HCl are reacted with Nitro Benzene.This become

    asked on June 12, 2017
  13. Mathematics

    State whether this infinite series converges or diverges? 1+(t) + (t^3)+...... t=[(5x+6)/(3x-2)] My thoughts on the question: The sum of 'n' terms in a geometric progression is a[r^n - 1]/(r-1)--(let's calk this 1), where r>1 and when r

    asked on June 8, 2017
  14. Chemistry-ksp and kb

    We were given a 0.1 M KOH solution.25cm3 of that solution is taken and 5g of MX precipitate is added to that.X- is an anion of a strong acid. Kb for MOH=2*(10)^-5 Ksp for MX= 3*(10)^-6 M 1)find the [M+] in the solution 2)Find the [X-] concentration and pH

    asked on May 24, 2017
  15. Physics-can someone check thjs question?

    cgi?id=1501763622#1501763622.1501764356

    asked on August 4, 2017
  16. Physics

    The speed of light in vacuum depends on, 1)wavelength 2)frequency 3)intensity 4)temperature 5)none of the above I know that 1 and 2 are correct. What about the others?

    asked on August 3, 2017
  17. Chemistry

    Order the following considering their boiling point in an aqueous solution. 1) pentan-2-one 2) pentan-2-ol 3) 2-aminopropanoic acid The answer key says the order (increasing) is, 1 < 2 < 3 and states 1 only have weak permanent dipole dipole forces and Van

    asked on July 28, 2017
  18. Chemistry

    If we wish to find the molar mass of a pure solid organic compound, which measurement would be most useful and why? A)melting point of the solid B)melting point depression of the mixture of the solid with 1,4-dichlorobenzene C)Heat of combustion

    asked on July 26, 2017
  19. Chemistry-titrations

    Question: An unknown mass of (NH4)2CO3 is mixed with 4g of NaOH and dissolved in 100cm3 of water,which results a clear solution.Gasses are removed by heating the final solution. 2 parts of 25cm3 of final solution is taken and one is titrated with 0.5 M HCl

    asked on May 29, 2017
  20. Math

    Find the greatest value of a,so that integrate [x*root{(a^2-x^2)/(a^2+x^2)} ] from 0-a

    asked on August 1, 2017
  21. Chemistry

    When comparing the boiling points of two compounds,one is a gas and the other is a liquid,is there anything like the liquid will have a lower boiling point than the solid? The molecular mass of the liquid is lower than the solid and they have the same type

    asked on July 31, 2017
  22. A suggestion -@Writeacher

    I don't know whether suggestions are welcomed,but I would like to express what I feel about this change and hope anyone won't misunderstand this as being rude. From my point of view this change will be causing some difficulties to students and also

    asked on July 30, 2017
  23. Chemistry

    What should be the pH value of the solution to double the solubility of the ionic compound NX? Ka of HX=2*(10)^-5 M My thoughts on the question: Let the solubility of NX=x M 1) NX(s) N+(aq) + X-(aq) eq:con: x x (moldm-3) X^- HX + OH^- -->(2) HXH^+ + X^-

    asked on July 12, 2017
  24. Chemistry

    When a concentrated NaCl aqueous solution is electrolyzed, what is the reason for the stabality of the products to be lesser stable as of thermodynamically, with respect to the reactants? Is it because the products are gasses? H20(l) +4e--->H2(g) +

    asked on June 19, 2017
  25. Chemistry to DrBob222

    Regarding my question on display.cgi?id=1496901710(I can't post URLs) Can we apply the formula PM=dRT seperately to the systems before and after being heated,and solve this one?

    asked on June 14, 2017
  26. Mathematics-Integration

    Question: For any positive integer n,show that integrate.[(sin x)^2n dx ] from o - π/2 = [(2n)!*π]/[(2)^(2n+1)*(n!)^2 ] What I thought: Let I =int.[(sinx)^2n dx] And again I= int.[ (sin(π/2-x))^2n dx] = int.[ (cos)^2n dx] 2I= int.[(sin x)^2n + (cos

    asked on June 12, 2017
  27. Math

    Show that for real x that {[cos x + 2 sin x + 1]/[cos x + sin x] } cannot have a value between 1 and 2. Let y = [(cos x+2 sin x + 1)/(cos x + sin x) ] y(cos x + sin x) = (cos x + 2 sin x + 1) sin x(y-2) + cos x(y-1)=1 , I just feel that this isn't the way

    asked on August 1, 2017
  28. Chemistry

    Does a neutral solution always act as a buffer solution?

    asked on July 31, 2017
  29. Chemistry

    Do the reaction rate depends on the concentration of catalyst? I googled this and found that the decomposition of H2O2 stops of we add excess MnO2. Are there any other examples like this? Or does this happens with every catalyst when they are in excess or

    asked on July 31, 2017
  30. A suggestion - @Writeacher

    I forgot one main thing:it would be a great help for us students,who use phones,if we are allowed to post the link to our original questions. Thanks again!

    asked on July 30, 2017
  31. To @Writeacher

    Yes,I used my phone to access this site from the very first day because I'm far from home due to my studies and usually I use my phone to get help with my studies.And it wasn't until yesterday this happened. So will I have to post it as a new

    asked on July 30, 2017
  32. Chemistry-@DrBob222

    I apologize for having to bother you again,but I still can't post follow up questions and I can't find the reason.I even tried reinstalling the browsers,and still the same. Anyway you responded to my last post regarding H2 O2 fuel cell, "I agree". So did

    asked on July 30, 2017
  33. Chemistry

    If we were asked to order SO2,H2O,CuO and CaO considering their acidity, how do we find what is more acidic from CaO and CuO?

    asked on July 27, 2017
  34. To DrBob222

    This is regarding the Biochemistry question postef by Grace.. I'm wasn't able to mention this in the subject section due to the large no.of characters! I apologize for any inconveniences made! In this case,to calculate pH of the solution, we should find

    asked on July 23, 2017
  35. Physics

    A hemisphere of radius r is placed on a horizontal plane and a small mass of "m" is placed on the top of the hemisphere. Find the height from the ground to the mass m,at the moment it loses it's contact with the hemisphere.And the contact is frictionless.

    asked on July 11, 2017
  36. Chemistry

    How do we order the following considering their acidic nature? 1)CH3COOH 2)Phenol 3)C6H5COOH 4)CH3C(triple bond)CH 5)a cyclic alcohol [ (CH2)5-CH-OH ] I know that Phenol is acidic than alcohols and Carboxylic acids are acidic than alcohols and the alpha H

    asked on July 10, 2017
  37. Chemistry

    With which of the following AgNO3 makes a precipitate quickly? And what would be the reason? 1) C6H5Br 2)C6H5-CH2Br 3)(CH3)3-C-Br 4)C6H5-CH2-CHBr-C(triple bond)H 5)C6H5-CH2Br-CH=CH-CH3 I feel like that 1st one is most probably,not the answer as it is not

    asked on June 29, 2017
  38. Organic Chemistry

    We are asked to order the following compounds considering their hydrolysis. 1)CH3COCl 2)CH3CO-C2H5 3)CH3-CO-N:H2 4) CH3-CO-O-CH3 What are the main factors which determine how easily they tend to hydrolysis?

    asked on June 18, 2017
  39. Chemistry- Henry's Law

    Why Ammonia is a deviation from the Henry's Law,when it is dissolved in water? Does that has anything to do with Ammonia having Hydrogen bonds? Or what could be the reason?

    asked on June 12, 2017
  40. Chemistry

    Under special conditions D2 is reacted with Ca to make CaD2.What would result if D2 is reacted with H2O?

    asked on June 12, 2017
  41. Chemistry

    What is more basic KO2 or KOH? I know that KO2 is also craeted this way; KO2 + 2H2O ----> 2 KOH + H2O2 + O2 I think,as KOH is created by this reaction and KO2 being a raectant, the compounds created should have less strong,more stable characteristics when

    asked on June 12, 2017
  42. Chemistry - percipitates

    10g of AgI is dissolved in 100cm3 of water and Na2SO4(s) is added to the solution with the ppt.After about 10mins.25cm3 of the solution is taken and added Cl2 and heated.The remains Cl2 is removed and a small amount of KI(s) is added and then the solution

    asked on June 12, 2017
  43. Mathematics -Integration : to Steve

    But how do we integrate ln|1+tanx| da X=theta =int.[ln|cos x|dx] +int.[sin x| dx ] - int.[ln|cos x| dx] ?

    asked on June 9, 2017
  44. Mathematics-Integration

    Using a suitable substitution show that integrate {[ln|1+x|]/[1+(x)^2]} from 0-1 = (π/8)ln|2| On this one, I don't really have any ideas of going forward solving this.I don't see a substitution which will simply the integral.

    asked on June 9, 2017
  45. Mathematics - Complex numbers

    /display.cgi?id=1496234706

    asked on June 8, 2017
  46. Mathematics-Complex Numbers

    Question: If z1 , z2 ,z3 are complex numbers and |z1|=|z2|=|z3|=1 and (z1)^3+(z2)^3 + (z3)^3 +z1*z2*z3=0 find the maximum and minimum values of |z1+z2+z3|. My thoughts on the question: Let z1=a , z2=b and z3= We know that |a+b+c|

    asked on May 31, 2017
  47. Chemistry-pH

    Question: v cm3 of a 0.2 M HX solution and v cm3 of 0.1 M KOH solution is mixed.pH of the final solution is 5.3 1)Find ka of HX 2)Find the moles of NaOH and HCl should be added respectively,for the pH of 1dm3 of the solution to increase and decrease by 1

    asked on May 31, 2017
  48. Chemistry-kD

    A chemical "X" is included in a water in a pond. 1)5dm3 of water from the pond is taken and is mixed with 200cm3 CHCl3.Then CHCl3 layer is taken out separately and left to vaporize. Then the remaining mass of X is measured.There was 10mg. 2)The remaining

    asked on May 29, 2017
  49. Physics

    A man climbs down a rope which is connected to a tree.The breaking stress of the rope is 75℅ of his mass.Find the maximum acceleration he can climb down the rope? Does the breaking stress here acts as the tension(T) If so by applying F=ma downwards, mg-T

    asked on August 3, 2017
  50. Physics

    Inside a box(mass "M"), a light string "X" is atthached to it's bottom and the other end of the string is attached to a mass "m"(this makes a pendulum). This system is attached to the point O(the center of gravity of the system), by a string " Y" and moved

    asked on August 3, 2017
  51. Math-to Steve

    I posted a follow-up question to your response at my post available at, display.cgi?id=1501575066 Hope you saw it! Thank you!

    asked on August 3, 2017
  52. Chemistry

    How do we order the folllwing considering how easily they grab H^+ ions, when dissolved in liquid ethanoic acid? 1)OH^- 2)F^- 3)Cl^- 4)Br^- 5)I^- I think the correct order is 5

    asked on July 31, 2017
  53. Chemistry

    Why do Chloroethanoic acid(s) do not hydrolyze? Is it because it they has(have) Cl atom(s)? But the NH4^+ ions in NH4Cl do hydrolyze. What is the reason for this difference?

    asked on July 31, 2017
  54. Chemistry

    State whether the following statements are true or false. The importance of using H2 O2 cell in jet engines; a)because it doesn't release gasses which cause Greenhouse Effect b)because it doesn't release gasses which cause Ozone layer depletion The answer

    asked on July 29, 2017
  55. Math-intergration

    Show that integrate.[e^(-4x)*(cos 3x)] from 0-infinity =4/25 I got the answer(without applying limits) as, {(e^(-4x) )[3sin(3x) - 4cos(3x)]}/25 But when applying the upper limit what is the value of, {(e^(-infinity) )[3sin(3*infinity) -4cos(3*infinity) ]

    asked on July 29, 2017
  56. Math

    7 men are 5 women are seated in a row.Find the ways they can be sated so that two women are not together. Starting with a man, the ways=(7!*5!)*2!,multiplied by 2! because we can reverse the way seated. Starting with a woman,

    asked on July 28, 2017
  57. Math

    Is there any method to calculate the value of (1+i)^n + (1-i)^n , without using the binomial theorem or Euler formulation? As (1-i) is the conjugate of (1+i) we can take the value of (1+i)+(1-i)= real part of (1+i) But how to avoid Euler formula?

    asked on July 28, 2017
  58. Physics

    A rope kept on a horizontal plane moves with a constant acceleration. If a constant force "f" acts on the rope,the tension of the middle of the rope is T. Which of the following are true? a)If the rope has a weight,T/f=1/2 b)If the rope is light,T/f=1 c)If

    asked on July 27, 2017
  59. Chemistry

    If we are given the ksp of AgCl at 14°C and 42°C,how do we find the ∆H° for the dissociation of AgCl(s)?

    asked on July 26, 2017
  60. Chemistry

    Why can't we apply Kd directly to a equilibrium solution of CCl4 and H2O,with CH3COOH dissolved? Do CH3COOH form polymers in CCl4? or are their single molecules of CH3COOH in CCl4?

    asked on July 26, 2017
  61. Chemistry

    How do we order the following,considering their stability when they are in (+3) oxidation state? Al Ga Tl Sc We've been taught that (+3) is the common oxidation state of Sc. And when it comes to Al ,Ha,Tl how do we order them?

    asked on July 24, 2017
  62. Chemistry-Ideal gases

    Can we convert an ideal gas into a liquid?

    asked on June 19, 2017
  63. Chemistry

    What is more acidic from [CuCl4]^(-2) and ethanoic acid? And what is the reason?

    asked on June 19, 2017
  64. Mathematics-Integration

    Question: f(x)=ax^2 + bx + c {a,b,c €R} When 0

    asked on June 12, 2017
  65. Mathematics-Integration

    How do we integrate {[1/(√(1-x^2) )]*[ln|(2x+3)(√(1-x^2))] } ? Is there any suitable substitution or do we have to do this by parts? I don't have any idea to proceed on.

    asked on June 12, 2017
  66. Chemistry-titrations

    When an acid is titrated with a Carbonate, do we have to heat the system when Hph is the indicator? If so what is the reason?

    asked on June 12, 2017
  67. Chemistry

    Question: At 300 K,Carbon powder and O2 are included in container of 10dm3.When the system is heated well,all the O2 converts into CO2.Then the system is cooled to the initial temperature. The volume of the Carbon powder is negligible. Find the percentage

    asked on June 8, 2017
  68. Chemistry

    Question: 50cm3 of 0.4 M Ba(OH)2 and 50cm3 of HA of unknown concentration is added together.At 25°C,pH of the solution is 9.With appropriate assumptions calculate the [HA] and ka of HA. My thoughts on the question: There are more than one approach which

    asked on May 28, 2017
  69. Calculus

    How do we integrate [(cosx)^2(nx)(sin(nx))]/[a-(cos(nx))] dx?

    asked on May 27, 2017
  70. Maths-Complex numbers

    If z is any complex number where |z|=1,show that using the Argand plane 1

    asked on May 23, 2017
  1. physics

    Hope you've heard about equations of motion. For this one we can use v=u+at , where v=final velocity(in m/s) , u=initial velocity(in m/s) , a=uniform acceleration(in m/S^2) and t=time(in seconds). Now substitute values for the above equation to find the

    posted on December 1, 2017
  2. Chemistry

    Moles of Na3PO4 = 5.45 g/molar mass of Na3PO4 g/mol Let the volume of the Na3PO4 solution be=v dm^3 1.86 mol/dm^3 * v dm^3 = moles of Na3PO4 Hope this helps..

    posted on December 1, 2017
  3. Chemistry

    I hope you may have learned about the Ideal gas equation(PV=nRT), where P=Pressure of the gas , V=Volume of the gas , n=amount of gas/substance(in moles) , R= Universal gas constant , T= Absolute Temperature of the gas We use this equation for the

    posted on December 1, 2017
  4. Chemistry

    Assuming complete dissociation of NaI as it is an ionic compound, NaI --> Na^+ + I^- x x (moldm^-3) and, AgI Ag^+ + I^- y y (moldm^-3) y=solubility of AgI So the total [I^-]=(x+y) moldm^-3 But, Ksp AgI = [Ag^+][I^-]=y(x+y) mol^2dm^-6 = 1.5*10^-16

    posted on December 1, 2017
  5. Physics

    Thank you!

    posted on August 3, 2017
  6. Physics

    typo: * 1 and 2 are incorrect Actually I was expecting a simpler explanation than what I've found on them already. :-)

    posted on August 3, 2017
  7. Physics

    *Ty - (M+m)v^2/R + (M+m)g = (M+m)*0 Ty= (M+m)[(v^2/R) - g ]

    posted on August 3, 2017
  8. Math

    Did you find any mistakes in my calculations? I thought they were expecting a whole number!

    posted on August 3, 2017
  9. Math

    Many thanks to both of you!

    posted on August 1, 2017
  10. Chemistry

    At the same temperature one is a liquid and other is a liquid. Being a liquid and having one more step to become vapour,is that a reason for the liquid to have a lower boiling point than the solid?

    posted on August 1, 2017
  11. Math

    2x*3y*4z= 24xyz Now substitute the given values to find the value of (24xyz)

    posted on August 1, 2017
  12. Math

    (x+1)^2 = x^2 + 2x + 1 So x^2 + 2x + 1 = (7)^2 = 49

    posted on August 1, 2017
  13. Chemistry

    How about I2 and Br2 for an example,at room temperature? Br2 is a liquid at room temperature and it's molecular mass is lower than I2(s) and they have same kind of intermolecular forces too.

    posted on August 1, 2017
  14. Chemistry

    Never mind and thank you!

    posted on August 1, 2017
  15. Chemistry

    I understand and thank you very much!

    posted on August 1, 2017
  16. Chemistry

    Thank you!

    posted on August 1, 2017
  17. Chemistry

    Question: At the same temperature and under same pressure, one is a liquid and the other is a solid.The molecular mass of the liquid is lower than the solid and they have the same kind of intermolecular forces. Can we simply say the liquid has a lower

    posted on July 31, 2017
  18. Chemistry

    I've made a very bad mistake.It should be corrected as one is a solid and the other is liquid. I apologize for the inconveniences made!

    posted on July 31, 2017
  19. Chemistry

    I think we have to assume that they are under the same pressure to compare their boiling points. I should've mentioned that!

    posted on July 31, 2017
  20. Chemistry

    Yes...Both of them are right. But the answer key has taken that 2nd statement doesn't explain the 1st.That's what I've being thinking about...

    posted on July 31, 2017
  21. Chemistry

    At the same temperature one is a liquid and other is a liquid. Being a liquid and having one more step to become vapour,is that a reason for the liquid to have a lower boiling point than the solid?

    posted on July 31, 2017
  22. Chemistry

    Or are they both reasons(as they are related)

    posted on July 31, 2017
  23. Chemistry

    Thank you!

    posted on July 31, 2017
  24. Chemistry

    And one more question: Is the type of bond(covalent!ionic) also important in deciding how easily a compound will hydrolyze?

    posted on July 31, 2017
  25. Chemistry

    Thank you!

    posted on July 31, 2017
  26. Math

    I've studied calculus. And we're asked to find this for positive integers of c,(c

    posted on July 31, 2017
  27. Math

    And what if it's (x+p)^2 + y^2 =p^2 ,instead of (x+p)^2 = p^2 ? How do we eliminate y^2 ?

    posted on July 31, 2017
  28. Math

    Thank you!

    posted on July 31, 2017
  29. Math

    *so a - (1/a) =(7/12) Multiply both sides from 12a to get, 12(a^2) - 12 =7a

    posted on July 31, 2017