Total # Posts: 2,671
Calculate the concentrations of all species in a 1.41 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 102 and Ka2 = 6.3× 108. Na^+ = 2.82M SO3^2- = 1.40M HSO3^- = 0.00047M H2SO3 = OH^- = H^+ = I have been ...
October 11, 2012
Two boys of the same mass, 45 kg, are on a playground merry-go-round that has a diameter of 4.0 meters. Both boys are at the very edge of the ride. One boy stands with the coefficient of friction between his shoes and eh ride being .45 whereas the other is on his knees with a ...
October 10, 2012
Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place. I apologize for the re-post, but I felt the previous one was labeled ...
September 27, 2012
Thank you very much for the reply. I was able to solve for X (X = 7.03E-8), which I added to that of HCl (Total = 1.405E-7) and was able to obtain the pH (6.85, assume this answer is deemed correct). Here is my problem: I took the (H^+) from HCL (X?) and divided it by the (...
September 27, 2012
Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place.
September 27, 2012
Chris is shopping for CDs and decides to purchase 3 movie soundtracks. The store has 9 different movie sountracks in stock. How many different selections of movie sountracks are possible?
September 19, 2012
2. ________ in the pancreatic islets secrete the hormone insulin in response to a high concentration of glucose in the blood. A. Beta cells B. Alpha cells C. Gamma cells D. Sigma cells i put b but it said it was wrong
September 18, 2012
. The cheetah is the fastest running animal in the world. Cheetahs can accelerate to a speed of 20 m/s in 2.5 an can continue to accelerate to reach a stop speed of 29 m/s. Assume the acceleration is constant until the stop speed is reached and is zero thereafter. (a) Express ...
September 16, 2012
Can someone check my answers for me? True or False... 1. TRUE you should use a comma before the word and. 2. FALSE The following is a sentence fragment: It no longer flies. 3. TRUE In the following sentence, the ()'d word is used correctly: The (Jones) ...
September 13, 2012
prepare some 0.1 HCl by diluting the appropriate volume of stock 'conc' HCl to 1L. The stock acid is 37.4% HCl by weight and has a density of 1.19g/mL . Measure out the required volume with a graduated clyinder
September 13, 2012
In a stunt for an action movie, the 100 kg actor jumps from a train which is crossing a river bridge. On the river below, the heroine is tied to a raft floating towards a waterfall at 3 m s−1. The raft and heroine have a total mass of 200 kg. a If the hero times his ...
September 12, 2012
An open top box is made by cutting congruent squares from the corners of a 12 inch by 9 inch sheet of cardboard and then folding the sides up to create the box. What are the dimensions of the box which contains the largest volume?
September 9, 2012
A manufacturing company issues a bond with a 100,000 face value and a coupon rate of 7%. If the bond has a life of 30 years, pays annual coupons, and the yield to maturity is 6.8%, what percentage of the bond's price is the present value of the face value?
September 6, 2012
How is overall molecular polarity affected by molecular symmetry (specifically shown for alkenes in book)? And what are the consequences for melting and boiling points (in cases of high molecular symmetry versus low molecular symmetry)? I looked for help in the book but it ...
September 5, 2012
How is overall molecular polarity affected by molecular symmetry (specifically shown for alkenes in book)? And what are the consequences for melting and boiling points (in cases of high molecular symmetry versus low molecular symmetry)?
September 4, 2012
Mean intake of seafood in the United States is approximately 3- 1/2 ounces per week, and increased intake is? A. Not advised B. Believed to cause harm C. Not likely to help or harm D. Recommended i think c
August 23, 2012
HELP?! 1.-9^2 2.(5x^9y)(-2x^-2y^-3) 3.(a^1b^-2) / (a^-2b^4) 4.(7x^-1/y^4)^-2 Scientific notation: 5) .0000745 Decimal Form: 6) 9.3*10^6 Solve: 7.3√-27 8.√(-5a)^2 Simplify: 9.√60x^5y^2 10.√75x^3 / √3x
August 16, 2012
The Jones Act, as the Merchant Marine Act was passed to support a strong national merchant marine, requiring that ships transporting goods on U.S. territorial waters to be built, owned and operated by U.S companies. The majority of the crew also must consist of U.S. citizens. ...
August 9, 2012
When is the best time to read review the discussion questions? A. Immediately after you have finished all of the reading. B. After you write your notes. C. Before you begin any detailed reading. D. At least 1 hour after your detailed reading.
August 8, 2012
A 565 N mountain climber moves across a rope strung across a canyon. When she is more than halfway across, she notices the rope makes a 10.0 degree angle (from horizontal) behind her and a 25.0 degree angle (from horizontal) ahead of her. What are the tensions in the rope in ...
July 30, 2012
1.También tengo mi propio auto. 2. Me llamo Mario Verdejo. 3. Soy el mejor chofer de Santiago. 4. Mi nuevo cliente se llama Jaime Talavera y es de los Estados Unidos. 5.Mañana vamos al Valle de Maipo. can some one help me put this in order cant seem to figure it ...
June 29, 2012
The phrase "my eye caught the shadow means" : A. I saw the shadow out of the corner B. My eye went and grabbed hold of a shadow C. The shadow grabbed my eye D. I saw a man standing at my side
June 24, 2012
A wave is described by the equation y = (4.5×10−2) sin (1.9x − 3.2t), where lengths are measured in meters and time in seconds. What is the displacement of a particle at position x = 2.7 m at time t = 5.8 s? Note: Remember that the argument of the sine ...
June 15, 2012
Oakwood Plowing Company purchased two new plows for the upcoming winter. In 200 days, Oakwood must make a single payment of $22,950 to pay for the plows. As of today, Oakwood has $22,500. Assume the Oakwood puts the money in a bank today, what rate of interest will it need to ...
June 13, 2012
The figure shows a uniform disk with a circular hole cut out of it. The disk has a radius of 4.00 m. The hole's center is at 2.00 m, and its radius is 1.00 m. What is the x-coordinate of the center of gravity of the system? The center of the disk is (0,0) The center of the...
June 10, 2012
You have finally saved 10,000 and are ready to make your first investment. You have the three following alternatives for investing that money: 1) Captial cities ABC Inc. bonds with a par value of $1000 that pays an 8.75 percent on its par value in interest, sells for $1.34 and...
June 7, 2012
Her are the data on $1000 par value bonds issued by Microsoft, Ford, and Xerox at the end of 2008, Assume you are thinking about buying these bonds as of January 2009. Answer the following questions. a. Calculate the values of the bonds if your required rates of return are as ...
June 7, 2012
An applied force accelerates a 50-kg crate along a frictionless floor from rest to 5 m/s.The work performed by this force is most nearly 125 J 250 J(x) 500 J 625 J 1,250 J Can someone please explain this to me and help? I thought it was 250 J but my calculation was wrong.
June 2, 2012
Why did Queen Mary imprison her half -sister Elizabeth? a-She had converted to Calvinism b- She had led an uprising c- She was beautiful d- She was popular and protestant answer: D correct?
June 1, 2012