Mohamed
This page lists questions and answers that were posted by visitors named Mohamed.
Questions
The following questions were asked by visitors named Mohamed.
What is the derivative of x - 4/x square. Just the denominator is squared.
15 years ago
A particular reaction has an activation energy of 51.6 kJ/mol-rxn. How much faster is the reaction at 50 oC versus 25 oC? a. 2 times b. 5 times c. 3 times d. half as fast d. 20% as fast I think it would be A??
13 years ago
The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I - = H2O + IO - (slow) H2O2 + IO - = H2O + O2 + I - (fast) Which o...
13 years ago
What is the pH of 1.0M Na2SO3 (aq)solution at 25C? a) 3.40 b) 6.03 c) 10.60 d) 7.96 e) 10.40 How can I get ph from only the Molarity?
13 years ago
What volume of carbon dioxide is produced when 0.979 mol of calcium carbonate reacts completely according to the following reaction at 0oC and 1 atm? calcium carbonate (s)---> calcium oxide (s) + carbon dioxide (g) Should I use the ideal gas law?
13 years ago
How many moles of hydrogen gas are required to react completely with 807 L of ethylene (C2H4) according to the following reaction at 0oC and 1 atm? hydrogen (g) + ethylene (C2H4) (g)---> ethane (C2H6) (g) Should I use the ideal gas law here?
13 years ago
What volume of hydrogen sulfide is required to produce 161 liters of sulfur dioxide according to the following reaction? (All gases are at the same temperature and pressure.) hydrogen sulfide (g) + oxygen (g)----> water (l) + sulfur dioxide (g)
13 years ago
1. An aqueous solution contains 0.154 M ascorbic acid (H2C6H6O6) and 0.196 M hydrobromic acid. Calculate the ascorbate (C6H6O62-) ion concentration in this solution. Can you explain how to do this please? thank you. Also if you can is number 2 missing inf...
13 years ago
A woman weighing 500 N stands in an elevator that is traveling upward. At a given instant the speed of the elevator as well as the women is 10m/s and both are decreasing at a rate of 2 m/s2 at that instant the elevator is exerts a force on the woman that...
13 years ago
Fill in the blanks with the chosen words. words: after and till because as but for if when since so though unless until while or 1) The children went home. It was getting dark. 2) The boys were allowed to read books. The teacher was absent. 3) Mother told...
11 years ago
Choose the following words to combine these sentence. words: after and till because as but for if when since so though unless until while or 1) The children went home. It was getting dark. 2) The boys were allowed to read books. The teacher was absent. 3)...
11 years ago
Is this sentence is correct? He wanted to polish his shoes, for it were covered with mud. or else replace it with they.
11 years ago
If you try hard enough, you will surely succeed.
11 years ago
Ho, ho! That was a good joke. Good heavens! You won the first price. Oh dear! You should not done that Bravo! You have won the prize. have you spent all your pocket money? Tut-tut! Did you break the cup. Hush! The king is going to speak
11 years ago
2^(x+2)-2^(x)=24 ??
9 years ago
Mg3N2(s) + 6H20 = Mg(OH)2(s) + 2NH3(g) When 2 moles of H20 react How many grams of NH3 are produced ?
9 years ago
If x+ay=b, then y equals
9 years ago
find the rate of interest compound semi-annually at which birr 2000 will grow to birr 5000 in 9 years?
9 years ago
You throw a small rock straight up from the edge of a highway bridge that crosses a river. The rock passes you on its way down, 7.00 s after it was thrown. What is the speed of the rock just before it reaches the water 29.0 m below the point where the roc...
9 years ago
A 543-N physics student stands on a bathroom scale in an 805-kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 473 N A) Find the magnitude of the acceleration of the elevator.
9 years ago
(6x^3-8x^2-6x)/(3-11x-8x^3)
8 years ago
Horizantal limit of (6x^3-8x^2-6x)/(3-11x-8x^3)
8 years ago
Michael Van Gough an attorney experienced in real estate transactions and his wife Kimberly were interested in buying certain property being sold by Carol Martin for her former husband Johnny Martin. When Van Gough asked Carol Martin if there had been any...
8 years ago
3y^2-5y+2=0
6 years ago
Which of the following play centers can be added to the block center?
5 years ago
Construct a quadrilateral pqrs such that /pql=8cm,qps =105,angle pqs=30°,/pr/=9cm,/rs/=9cm,/RS/=/rq/ Measure /rsl measure/ps/ Measure<qrs
5 years ago
If 3.21mol of a gas occupies 56.2L at 44C and 793torr ,5.29 mol of this gas occupies _______ L under these conditions.
5 years ago
Pellets of sodium hydrogen Carbonate and anhydrous CuSO4 were put in petri-dishes and left in the open. What will be the observation?
5 years ago
How many grams of ethanol C2H5OH(1),must be added to 500.0 g of water to make a solution that freezes at0.00 F? The molal freezing point depression constant water is 1.86 C.kg/mole
4 years ago
Name ten branches of P H E
4 years ago
Q/ Find the parametric equations of the line joining the points P1( 1, 1, -1) and P2( 1, 2, 0)?
4 years ago
What can be done to correct the quotation integration example below? In the story, Grandfather replies to the narrator with a "very sad shake of his very old head". Remove the words that appear after the quotation Remove the words that appear prior to the...
3 years ago
The sum of the 3rd and the 7th term of an A P is 44,if the 9th term is 42 calculate the first term and the common differences
3 years ago
Answers
The following answers were posted by visitors named Mohamed.
integral of(1/3)tan(3x)dx = (1/3)integral of(sin3x/cos 3x) dx = (1/3)ln|sin 3x| + C then the final answer is (x tan3x)/3 - (1/3)ln|sin 3x| + C
17 years ago
1) cosθ=0.8 , θ is in fourth quadrant θ= cos^(-1)0.8=36.86989765 + 270=306.87 so , sin 2θ= sin2(306.87)= -0.96 answer : a
17 years ago
1) cscθ = (-5/3) , θ is in third quadrant 1/sinθ = (-5/3) => sinθ= -3/5 θ= -36.8699 θ is in third quadrant so θ = 36.8669+180 = 216.8669 tan2θ = tan2(216.8669) = 3.42724 = 24/7 answer : c
17 years ago
thanks for note Reiny .
17 years ago
(8.66 10^-9 m )x( 1mm / 10^-3 m ) =(8.66 10^-9 )x( 1mm / 10^-3 ) = 8.66 x 10^-6 mm
17 years ago
There are to points : (42,20) , (52,10) m=(20-10)/(42-52)= -1 => m=-1 choose any point from the two points . (42,20)=(x1,p1) p-p1=m(x-x1) => p-20=-1(x-42) p=-x+42+20 => p=-x+62
17 years ago
Its A The set S has 4 elements which are f h m and r
15 years ago
Wait I think I got it The equation can be written as x-4x^-2 so d/dx(x)=1 and d/dx(-4x^-2)= -2(-4)(x^-2-1) which is 8x^-3 d/dx(x-4/x^2)= 1+8x^-3 correct?
15 years ago
pH = -log(concentration) pH of HClO4= -log(5.8x 10^-2 M) use a calculator and figure it out do the same for the second.
15 years ago
Okay first lets figure out the equation P+H2---->PH3 balance it now we have: 2P + 3H2 --->2PH3 equation is now balanced. let us now find the reactant in excess 2 moles of P= 3 moles of H2 2(31)g of P = 3(2)g of H2 6.2 g of P= x x= 6.2x6/62= 0.6 g of H2 4...
15 years ago
So based of the rule of thumb, its going to be 5 times faster. Also how can I use Arrhenius equation without the rate constant (k)?
13 years ago
B for the second question
13 years ago
is 10.97 L correct?
13 years ago
Don't you have to divide moles of calcium carbonate by 2 to get moles of carbon dioxide? and then multiply by 0.0821 and 273 and then divide by 1?
13 years ago
PMT= $2363.1
11 years ago
1) Because 2) For 3) As 4) Till 5) when 6) but 7) So 8) But 9) If 10) While Correct the mistakes and re-post it.
11 years ago
They have not given the blanks
11 years ago
3/8
11 years ago
(-30,20)
11 years ago
R=sqrt(3^2 + 4^2) =sqrt(9+16) =sqrt(25) =5 N. the two vertical and horizontal forces are basically components of the resultant. Good luck in your studies!
10 years ago
Actually this is an interesting topic since it requires looking at the geographic extent of the Arabic language before and after the spread of Islam. Although not every Muslim speaks Arabic today, the geographic extent of the Arabic language being spoken...
9 years ago
I don't get any pic sorry I didn't
9 years ago
Not correct but thanks anyway
9 years ago
What volume (in liters) would the gas occupy at a pressure of 1.20 atm if its temperature remained unchanged?
9 years ago
P8 -3A
9 years ago
please send me answer
9 years ago
352.4285714286
9 years ago
kills
7 years ago
The correct ans. is (c)
7 years ago
Of course, 4,000 :)
7 years ago
Reason Why Boys Should Not Help In The Kitchen
7 years ago
Motion That Boys Should Not Help In The Kitchen
7 years ago
How we do it?
6 years ago
Thanks a lot for given me all my reguested answers
6 years ago
Helping my children
4 years ago
good
4 years ago
This the best website i ever came across
4 years ago
To help me
3 years ago
Answer
3 years ago
what is the importance of using the McFarland standard?
3 years ago
Waiting
3 years ago
Knowledge
3 years ago
Solve it
3 years ago