Popular questions and responses by Jenni
  1. Chemistry

    Consider the following reaction: 2NaCl(aq) + H2O(l) -> Cl2(g) + H2(g) + 2NaOH(aq) A 10.0g sample of sodium chloride was placed in 10.0 g of water. If 3.85 g of Cl2 was obtained, what was the percent yield of Cl2?

    asked on November 28, 2011
  2. Chem II

    Choose the aqueous solution below with the lowest freezing point. These are all solutions of nonvolitile solutes and you should assume ideal van't Hoff factors where applicable. a. 0.075 m NaI b. 0.075 m (NH4)3PO4 c. 0.075 m NaBrO4 d. 0.075 m LiCN e. 0.075

    asked on August 2, 2012
  3. physics

    when a 0.05kg bullet is fired into a block that is suspended by a long cord so that it can swing as a pendulum. if the block is displaced so that its centre of gravity rises by 0.10m,what was the speed of the bullet?

    asked on December 20, 2011
  4. Physics

    A packing crate is placed on a 32° inclined plane. If the coefficient of static friction between the crate and the plane is 0.67, will the crate slide down the plane? What is the minimum angle to which the plane must be raised so that the crate will slide

    asked on November 30, 2010
  5. Physics

    A 4 kg block slides down a frictionless incline making an angle of 60° with the horizontal. (a) What is the total work done on the block when the block slides 2 m (measured along the incline)? (b) What is the speed of the block after it has slid 1.5 m if

    asked on November 3, 2010
  6. chemistry

    What does 1.5 fold dilution and 2.5 fold dilution mean?

    asked on July 26, 2012
  7. Physics

    A train is moving 50km/h east. A person is walking 5 km/h west on the train. How fast is the person on the train going relative to an observer on the earth?

    asked on January 31, 2011
  8. biology

    Would you like to help me answers some of my questions in Biology? 1/ Darwin concluded that the most well adapted individuals in a population will leave the most offspring for future generations. This can be considered a measure of an individual's.. a/

    asked on May 8, 2011
  9. Chem 1

    Which one of the following electron transitions would result in the loss of energy from a hydrogen atom? a. n=1 to n=3 b. n=5 to n=3 c. n=4 to n=6 d. n=1 to n=5

    asked on May 17, 2012
  10. Chemistry!

    10.2 g of Pb(NO3)2 are dissolved in 100 mL of water, and added to 250.0 mL of a 0.250 M solution of KI. Determine the mass in grams of Pbl2 produced, and find the number of moles of the excess reagent. PLZ explain chemistry - DrBob222, Monday, December 13,

    asked on December 14, 2010
  11. poetry

    name an example of alliteration in Gwendolyn McEwan's Night on Gull Lake

    asked on May 24, 2011
  12. Physics

    The outer edge of a truck tire that has a radius of 20cm has a velocity of 21 m/s. what is the angular velocity of the tire in rad/s?

    asked on October 25, 2010
  13. chemistry

    What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!

    asked on December 4, 2010
  14. Compare two college essays, everyone please come!!

    I come back... and bring an new college application essay, please help me to revise the new one(the first one), and more important... to compare which one is better for my college application. If you are not good at writing, it doesn't matter, just tell me

    asked on December 3, 2006
  15. Algebra

    Given the function H(x)=81-12log(x+1), x>0, what happens to the function H(x) as the value of x increase.

    asked on December 12, 2019
  16.!! =)

    What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction? Assume a final volume of 285 mL. Zn(s) + CuCl2(aq)--> ZnCl2(aq) + Cu(s) Please Explain!! Thanks!!

    asked on December 6, 2010
  17. science

    can you please help me put these events in order from latest to earliest?: -pangea, the supercontinent, begins to divide -trilobites -dinosaur extinction -first crocodiles -archaeopteryx (early bird) -first flowering plants -protozoa (single-celled,

    asked on November 21, 2007
  18. Question about college application

    I had submitted a college application essay three days ago, but after I submitted it, I felt so uncomfortable with that one, because the essay was so bad, but I had to do that, it was the last day for priority application. Since I could not change anything

    asked on December 3, 2006
  19. Physics Problem

    A 60 kg skydiver moving at terminal speed falls 50m in 1 s. What power is the skydiver expending on the air? This what I got so far: powerloss=weight * velocity powerloss=60kg *50m powerloss=3000 (but I don't know the units)

    asked on September 25, 2007
  20. Topic of College Essay -- Draft

    Any one can help me to revise this college essay? It is very important for me, your help will me invaluable for me!! Thank you! Question: At the University of Maryland, we value a diverse community. How have your life experiences and background shaped you

    asked on November 23, 2006
  21. Math

    Tina can drive 46.8 miles on $6 worth of gasoline. Write a proportion(equation) that can be used find x the number of miles she can drive on $25 worth of gasoline.

    asked on November 30, 2010
  22. biology

    How do I calculate protein concentration if I know the purity is 97.3% and MW = 2666.31 kDA Thanks

    asked on July 17, 2012
  23. civics

    what are the advantages of a nondemocratic government?

    asked on October 11, 2007
  24. chemistry

    Posted by Jenni on Monday, December 13, 2010 at 3:32pm. Determine the molarity of nitrate ions in a solution prepared by mixing 25.0 mL of 0.50 M Fe(NO3)3 and 35.0 mL of 1.00 M Mg(NO3)2 Please explain fully do not know where to start? chemistry - DrBob222,

    asked on December 14, 2010
  25. Math please help

    Let s and t be any two whole numbers, excluding 0. True or False The statement s/t = t/s is always true? and What did you do first to answer this question?

    asked on November 30, 2010
  26. Math / Fractions

    I am having a hard time figuring out how to solve these fraction word problems. For example: A patch of dirt needs 3 5/6 cubic yards (yd3) of concrete to cover it. If Nick decides to cover only 3/4 of the dirt . how much sod does he need. How do I work

    asked on August 27, 2008

    Determine the molarity of sodium cations in solution when 6.21 g of sodium sulflate are mixed with 2.97 g of sodium nitrate in pure water to produce 350.0 mL of solution.......please explain every step. thanks!

    asked on December 13, 2010
  28. Math

    Let s and t be any two whole numbers excluding 0. True or false. The statement s/t = t/s us always true? what did you do first to answer this question?

    asked on November 30, 2010
  29. MATH

    1.Graph the function f(x) = (x + 3)3 by hand and describe the end behavior.

    asked on February 8, 2011
  30. physics

    A 5.4 kg wagon is pulled along a horizontal surface. The acceleration of the object is 0.9 m/s^2. What is the coefficient of friction between the surfaces? Any help is much appreciated! I am not sure how to go about the problem other than I think I must

    asked on December 29, 2010
  31. Chemistry!

    Determine the pH of the following, giving your answers to two decimal places. I don't know how to do these problems =( a. 0.100 M ammonia b. 0.11 M oxalic acid. Assume that dissociation resulting from Ka2 is negligible relative to that from Ka1

    asked on December 15, 2010
  32. Calculus

    what is x and cosh ln(x) when tanh(lnx^(1/2)= 12/13

    asked on November 8, 2014
  33. MATH

    Mrs. Wilkerson noticed that her in-laws’ birth dates have an unusual property. Her mother-in-law was born 5-31-36, and her father-in-law was born 9-25-34. Furthermore, her hus- band’s grandfather was born 7-7-14. How many birth dates in a century have

    asked on March 5, 2014
  34. chemistry

    I have 3 mg/mL AMP in 50ul stock solution; How do I dilute it to 50ug in 50ul thanks you

    asked on July 5, 2012
  35. chem

    How does the mammalian heart control blood flow to different parts of the body?

    asked on July 28, 2008
  36. math trigonometry

    If cos 20=m determine the values of the following in terms of m. (a) cos(-200) (b)sin 250 (c)sin 20 thanks

    asked on June 10, 2015
  37. math

    A box contains two black balls and three gold balls. Two balls are randomly drawn in succession from the box. a. If there is no replacement, what is the probability that both balls are black? b. If there is replacement before the second draw, what is the

    asked on December 15, 2010
  38. Physics Homework

    I have a few questions that I don't understand and would like to get checked, please? 5.If energy is conserved and momentum is conserved, would they both have to be conserved simultaneously in some interaction? My answer: No because each engergy and

    asked on September 25, 2007
  39. Application Essay

    Is it better now? Is anyone can give me some suggestions other than grammar problem? For example, ideas, etc. Of course...suggestions about grammar are also welcomed Thank you so much! I was glad that I had an opportunity to be an interpreter in a Howard

    asked on November 21, 2006
  40. physics

    a rock with a mass of 2 kg is thrown from the top of a cliff 75 m high with a velocity of 10m/s. how much Kinetic energy does it have when it gets to the bottom?

    asked on March 3, 2014
  41. Organic chem 1

    What is cyclopentane with a butane called?

    asked on March 11, 2013
  42. Chem 1

    consider 400 mL of a0.266 M LiNO3 solution. To what volume must it be diluted to make a 0.075 M LiNO3 solution.

    asked on May 2, 2012
  43. Chem 1

    Consider the following reaction. Assume that there is excess C3H7SH present. If we start with 0.5 moles O2, how many mols of SO2 can form?

    asked on May 2, 2012
  44. math

    3 (g-3) = 6 find the value of g

    asked on January 17, 2011
  45. chemistry

    calculate the molarity of 70.7g C2H6O in 2.25 L of solution, can someone walk me through this and provide the right answer? please and thank you =))

    asked on December 3, 2010
  46. math

    The Houston Chronicle on January 13, 2007 reported on Texans' ticket prices to be charged Texas football fans for the 2007 season. The average Texans' ticket price will be $60.63, an increase of $2.88 from last year. Before the 2007 season, 22 teams

    asked on July 16, 2010
  47. math

    A right cicular cylindrical can is to be constructed to have a volume of 57.749 cubic inches (one quart). The sides of the can are to be formed by rolling and welding a strip of metal, which may be purchased in rolls with width equal to the desired height

    asked on November 29, 2006
  48. Short answer for college application

    Could anyoneplease help me about this short answer for college application? I think I wrote a very bad paragraph, I have nothing to say about these two skills, is any one give me some ideas about how to expend my ideas, and help my writing, too. Thank you

    asked on November 25, 2006
  49. Gen chem 1

    According to the following reaction, what volume of 0.25 M CaCl2 solution is required to react exactly with 50.0 mL of 0.20 M Pb(NO3)2 solution? CaCl2(aq) + Pb(NO3) (aq)- PbCl2(s) + 2 KNO3(aq).

    asked on March 11, 2013
  50. Physics

    This problem is about the work-energy theorem. What is the final speed of the particle? Express your answer in terms of K_f and M.

    asked on March 1, 2012
  51. Chemistry!!

    Determine the pH of 0.100 M aqueous HCN to two decimal places, and determine the concentration of CN- at equlibrium to two singificant figures. Can you show me all the steps to this question? Please and thank you!

    asked on December 15, 2010
  52. college essay

    Yeah...The Multiculturalism is very appropriate to my idea. What I worried was, is it sounds too teminological? Anyway, now I use it. On the application form, there is only 9 lines that I can write this paragraph. I think only fit in about 100 words,so I

    asked on November 21, 2006
  53. Math 221

    What is 9/10+3/8=

    asked on July 13, 2014
  54. music

    this the guy that directed Newbies the same guy who directed High School musical?

    asked on November 2, 2013
  55. vet tech

    Which of the following sets of Library of Congress call numbers is in the correct order? A. E88 G2512 S57 1998, E88 G62 D225, E88 G62 L45, E88 G62 L166 1995 B. E88 G62 D225, E88 G62 L166 1995, E88 G62 L45, E88 G2512 S57 1998 C. E88 G62 L166 1995, E88 G62

    asked on July 31, 2012
  56. biology

    How do I calculate protein concentration if I know the purity is 97.3% and MW = 2666.31 kDA Thanks

    asked on July 17, 2012
  57. math

    3x-5y=24 3x+5y=6

    asked on March 23, 2012
  58. math-computer

    Please help me do this question!!!!! (C): 116.98GB Assuming a disk should never get more than 85% full, and assuming you were generating 200MB of new data per week, at what point would you need to add another hard disk to this PC? How long until you have

    asked on July 22, 2010
  59. Reading Strategies

    what does "getting above your raisins" mean? thanks for answer my question:)

    asked on July 18, 2010
  60. college essay

    Please tell me how to write better for this short Paragraph on the collge application. Thank you very much. Please choose one of the commitments that you listed above (activity, interest, or work experience) and provide a short description of its

    asked on November 21, 2006
  61. math

    absolute value of(x + 3) + absolute value of (3 - x) < 9. I am not sure how to go about this question. Although, we generally use three cases.

    asked on February 22, 2011
  62. bio

    Why is nitrogen fixation necessary? How is it accomplished in nature? How can soil nitrogen be supplemented for agriculture?

    asked on July 1, 2008
  63. Math 221

    What is 5(8+v)= Please break it down for me to get a better understanding?

    asked on July 8, 2014
  64. Topic of college essay

    There is a question that comes from a undergraduate application: At the UM, we value a diverse community. How have your life experiences and background shaped you into an individual who will enrich the UM community? I am an immigrants from China, I came

    asked on November 22, 2006
  65. Math 221

    6.25,16.1, and 9 is what length in meters

    asked on July 13, 2014
  66. College Essay

    Is it better now? Anyone can give me some suggestions other than grammar problem. For example, ideas, etc. Thank you so much! I was glad that I had an opportunity to be an interpreter in a Howard County event. I feel lucky that I can speak two different

    asked on November 21, 2006
  1. Spanish for Mary

    casino online play casino games online online casino gambling casinos online online casino gambling

    posted on December 3, 2018
  2. MATH

    Make up a set of numbers having the following landmark Median 9 Range 7 mínimum 5

    posted on September 4, 2017
  3. math


    posted on August 21, 2015
  4. Chem 1

    Thank you Dr. Bob, you rock

    posted on May 17, 2012
  5. Chem 1

    0.266 x 0.400/0.075= 1.42 L

    posted on May 7, 2012
  6. Chem 1

    8x10 -2

    posted on May 2, 2012
  7. intergers

    12 + -5

    posted on January 19, 2012
  8. Math


    posted on September 21, 2011
  9. math

    Thank You!

    posted on February 23, 2011
  10. Physics


    posted on January 31, 2011
  11. physics

    I forgot to mention that the wagon is pulled by a force of 20 N.

    posted on December 29, 2010
  12. chemistry


    posted on December 14, 2010

    6.21g/142.042 = 0.0437 2.97g/84.994 = 0.3494 M=moles/L 0.0437+0.3494/350.0= 1.12x10^-03 So I got = 1.12x10^-03 but my book says [Na+]= 0.350M Where did I go wrong?

    posted on December 13, 2010
  14. math-computer

    x=5, right? I kind of confused about this question. Can you give me more explanation. Thanks

    posted on July 23, 2010
  15. math

    thanks henry^^

    posted on July 16, 2010
  16. Ethnic Diversity

    There is alot of good information here: AMP Report – July 3, 2008 American Muslims alarmed at the new profiling policy By Abdus Sattar Ghazali American Muslim community is alarmed at the proposed Justice Department policy change that would allow the FBI

    posted on September 18, 2008
  17. spanish

    How did the geography influence the immigration for the exploration in Colombia and Venezuela? How did the indegenous mix with the Europeans to develop the culture in Colombia and Venezuela?

    posted on December 6, 2007
  18. science

    i think it's like: -earth formed -water appeared on earth's surface -first vascular land plants (plants with roots and stems) -pangea forms -pangea divides -grass -earliest life (bacteria-like) - first flowering plants -forests of coal plants -first land

    posted on November 21, 2007
  19. civics

    ok. Thank you again!

    posted on October 11, 2007
  20. civics

    I have another queston. What is the disadvantage of a democratic government?

    posted on October 11, 2007
  21. civics

    Ok. Thank you so much!

    posted on October 11, 2007
  22. Accounting

    Guests pay one night’s stay in advance. On receiving the advance: Dr Cash 220, Cr Advance room rental revenue 220 (liability a/c). When the guest has stayed there and checked out: Dr Advance roon rental revenue 220, Cr Room rental revenue 220 (revenue

    posted on September 12, 2007