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.

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??

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...

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?

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?

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?

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)

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...

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...

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...

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)...

Is this sentence is correct? He wanted to polish his shoes, for it were covered with mud. or else replace it with they.

If you try hard enough, you will surely succeed.

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

2^(x+2)-2^(x)=24 ??

Mg3N2(s) + 6H20 = Mg(OH)2(s) + 2NH3(g) When 2 moles of H20 react How many grams of NH3 are produced ?

If x+ay=b, then y equals

find the rate of interest compound semi-annually at which birr 2000 will grow to birr 5000 in 9 years?

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...

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.

(6x^3-8x^2-6x)/(3-11x-8x^3)

Horizantal limit of (6x^3-8x^2-6x)/(3-11x-8x^3)

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...

Which of the following play centers can be added to the block center?

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

If 3.21mol of a gas occupies 56.2L at 44C and 793torr ,5.29 mol of this gas occupies _______ L under these conditions.

Pellets of sodium hydrogen Carbonate and anhydrous CuSO4 were put in petri-dishes and left in the open. What will be the observation?

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

Name ten branches of P H E

Q/ Find the parametric equations of the line joining the points P1( 1, 1, -1) and P2( 1, 2, 0)?

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...

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

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

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

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

thanks for note Reiny .

(8.66 10^-9 m )x( 1mm / 10^-3 m ) =(8.66 10^-9 )x( 1mm / 10^-3 ) = 8.66 x 10^-6 mm

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

Its A The set S has 4 elements which are f h m and r

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?

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.

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...

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)?

B for the second question

is 10.97 L correct?

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?

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.

They have not given the blanks

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!

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...

I don't get any pic sorry I didn't

Not correct but thanks anyway

What volume (in liters) would the gas occupy at a pressure of 1.20 atm if its temperature remained unchanged?

please send me answer

The correct ans. is (c)

Of course, 4,000 :)

Reason Why Boys Should Not Help In The Kitchen

Motion That Boys Should Not Help In The Kitchen

Thanks a lot for given me all my reguested answers

Helping my children

This the best website i ever came across

what is the importance of using the McFarland standard?