Questions and answers by

Shenaya

Questions (70)

cgi?id=1501763622#1501763622.1501764356
1. 1 answer
2. 297 views
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
1. 2 answers
2. 502 views
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
1. 3 answers
2. 543 views
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
1. 1 answer
2. 612 views
I posted a follow-up question to your response at my post available at,display.cgi?id=1501575066 Hope you saw it! Thank you!
1. 0 answers
2. 448 views
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. 4 answers
2. 636 views
Find the greatest value of a,so thatintegrate [x*root{(a^2-x^2)/(a^2+x^2)} ] from 0-a<=(π-2) Let I =integrate{ [x*root{(a^2 -
1. 4 answers
2. 697 views
How do we order the folllwing considering how easily they grab H^+ ions, when dissolved in liquid ethanoic acid?1)OH^- 2)F^-
1. 2 answers
2. 493 views
Does a neutral solution always act as a buffer solution?
1. 2 answers
2. 482 views
Do the reaction rate depends on the concentration of catalyst?I googled this and found that the decomposition of H2O2 stops of
1. 2 answers
2. 664 views
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
1. 4 answers
2. 4,333 views
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
1. 8 answers
2. 635 views
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<(17/16)
1. 7 answers
2. 977 views
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
1. 5 answers
2. 443 views
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
1. 1 answer
2. 468 views
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
1. 2 answers
2. 595 views
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
1. 3 answers
2. 648 views
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
1. 2 answers
2. 534 views
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"
1. 3 answers
2. 877 views
State whether the following statements are true or false.The importance of using H2 O2 cell in jet engines; a)because it doesn't
1. 2 answers
2. 552 views
Question : State whether the following are true or false.SO2 gas changes the colour of a KMnO4(aq) solution They have taken this
1. 3 answers
2. 625 views
Show that integrate.[e^(-4x)*(cos 3x)] from 0-infinity =4/25I got the answer(without applying limits) as, {(e^(-4x) )[3sin(3x) -
1. 2 answers
2. 746 views
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,
1. 2 answers
2. 802 views
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. 1 answer
2. 521 views
Order the following considering their boiling point in an aqueous solution.1) pentan-2-one 2) pentan-2-ol 3) 2-aminopropanoic
1. 3 answers
2. 542 views
A rope kept on a horizontal plane moves with a constant acceleration. If a constant force "f" acts on the rope,the tension of
1. 2 answers
2. 782 views
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?
1. 3 answers
2. 641 views
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)?
1. 2 answers
2. 548 views
Why can't we apply Kd directly to a equilibrium solution of CCl4 and H2O,with CH3COOH dissolved?Do CH3COOH form polymers in
1. 5 answers
2. 805 views
If we wish to find the molar mass of a pure solid organic compound, which measurement would be most useful and why?A)melting
1. 4 answers
2. 905 views
How do we order the following,considering their stability when they are in (+3) oxidation state?Al Ga Tl Sc We've been taught
1. 2 answers
2. 426 views
This is regarding the Biochemistry question postef by Grace..I'm wasn't able to mention this in the subject section due to the
1. 2 answers
2. 528 views
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
1. 2 answers
2. 715 views
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
1. 4 answers
2. 812 views
Does Ethanoyl Chloride gives out a white precipitate with aqueous AgNO3?We've been thought that an acid chloride gives out the
1. 0 answers
2. 1,010 views
How do we order the following considering their acidic nature?1)CH3COOH 2)Phenol 3)C6H5COOH 4)CH3C(triple bond)CH 5)a cyclic
1. 3 answers
2. 622 views
We have been thought that BaC2O4 is a precipitate when dissolved in H2O.When comparing its solubilty in water and in an aqueous
1. 2 answers
2. 2,681 views
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
1. 0 answers
2. 582 views
What will happen if we add Mg powder to a (NH4)2SO4(aq) solution?What would be the products?
1. 5 answers
2. 2,817 views
Can we convert an ideal gas into a liquid?
1. 2 answers
2. 490 views
What is more acidic from [CuCl4]^(-2) and ethanoic acid? And what is the reason?
1. 4 answers
2. 406 views
When a concentrated NaCl aqueous solution is electrolyzed, what is the reason for the stabality of the products to be lesser
1. 0 answers
2. 511 views
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
1. 0 answers
2. 452 views
Can Cu2+ oxidize1) SO2 2) C2O4(2-) Does this happens also when the solution is basic? Cu2+ + H2S ---> CuS + H2
1. 7 answers
2. 4,699 views
Regarding my question ondisplay.cgi?id=1496901710(I can't post URLs) Can we apply the formula PM=dRT seperately to the systems
1. 8 answers
2. 539 views
Question:f(x)=ax^2 + bx + c {a,b,c €R} When 0<=x<=1 , |f(x)|<=1 Show that |a|+|b|+|c| <= 17 I don't see a way to even start
1. 2 answers
2. 611 views
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
1. 2 answers
2. 819 views
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
1. 0 answers
2. 771 views
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
1. 0 answers
2. 519 views
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
1. 3 answers
2. 430 views
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?
1. 2 answers
2. 474 views
Under special conditions D2 is reacted with Ca to make CaD2.What would result if D2 is reacted with H2O?
1. 3 answers
2. 491 views
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
1. 2 answers
2. 631 views
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
1. 6 answers
2. 689 views
But how do we integrate ln|1+tanx| daX=theta =int.[ln|cos x|dx] +int.[sin x| dx ] - int.[ln|cos x| dx] ?
1. 5 answers
2. 548 views
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
1. 2 answers
2. 588 views
Question:At 300 K,Carbon powder and O2 are included in container of 10dm3.When the system is heated well,all the O2 converts
1. 2 answers
2. 589 views
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}
1. 3 answers
2. 895 views
/display.cgi?id=1496234706
1. 2 answers
2. 370 views
State whether this infinite series converges or diverges?1+(t) + (t^3)+...... t=[(5x+6)/(3x-2)] My thoughts on the question: The
1. 5 answers
2. 712 views
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
1. 1 answer
2. 897 views
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
1. 0 answers
2. 928 views
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 5.31)Find ka of HX
1. 4 answers
2. 684 views
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
1. 2 answers
2. 610 views
Question:An unknown mass of (NH4)2CO3 is mixed with 4g of NaOH and dissolved in 100cm3 of water,which results a clear
1. 2 answers
2. 679 views
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
1. 6 answers
2. 598 views
How do we integrate [(cosx)^2(nx)(sin(nx))]/[a-(cos(nx))] dx?
1. 3 answers
2. 512 views
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
1. 4 answers
2. 655 views
How do we find the value of(1.01)^5 approximately up to three decimals,only with the use of the Binomial theorem?
1. 3 answers
2. 525 views
If z is any complex number where |z|=1,show that using the Argand plane 1<= |z+2|<=3 and (-pi/6)<= arg(z+2)<= (pi/6)...I know if
1. 2 answers
2. 482 views