Smiley

Popular questions and responses by Smiley
  1. physics

    The current-density magnitude in a certain circular wire is J = (2.75 × 10 10 ⁄ )r 2 , where r is the radial distance out to the wire’s radius of 3.00 mm. The potential applied to the wire (end to end) is 60.0 V. How much energy is converted to

    asked on October 16, 2012
  2. SCIENCE!!

    a. Find the speed required to throw a ball straight up and have it return 6 seconds later. Neglect air resistance. b. How high does the ball go? Please Help!! Thanks!! :)

    asked on September 20, 2010
  3. Social Studies

    Apply your knowledge of Texas' economic development and geographic regions to explain where in Texas you would convince a tech company to locate. Explain why you would steer them away from other regions of the state.

    asked on September 19, 2016
  4. Science

    What is the difference between a controlled experiment and a natural experiment?

    asked on December 31, 2013
  5. personal finance

    A. The amount of an employee's income that an employer sends directly to the federal, state, or local tax authority B. Taxes, insurance, and saving plans deducted from a paycheck C. Provides a summary of the payroll information for each pay period D.

    asked on September 4, 2019
  6. Teacher Aide

    According to Ginott,if you make demands on misbehaving students, you can expect what?

    asked on May 17, 2014
  7. Earth science

    what is the material between 2900 kilometers and 5200 kilometers below earths surface inferred to be

    asked on April 8, 2010
  8. chemistry

    Where can I find the answers to these questions in my text, "fundamentals of analytical chemistry" by skoog, west, holler and crouch. 1. Why is acetylsalicylic acid analyzed using back titration? 2. Discuss the importance of simmering the tablet in the

    asked on July 14, 2007
  9. science gr.8

    A kicker strikes a ball with a strong force. a) Explain the evidence that shows the ball is not filled with liquid? b) Describe what is happening to the particles inside the ball? * chapter is about forces and pressure*

    asked on February 22, 2014
  10. science gr.8 science fair topic ideas

    what are some ideas for science fair projects gr.8?!?! and please give an experiment with it thank u!!

    asked on January 23, 2014
  11. socials gr.8!!

    what contributions has the arab society made to the canadian society?!? ANSWER IN COMPLETE SENTENCES PLEASE AND EXPLAIN!!!!

    asked on January 21, 2014
  12. poems

    does anyone know a poem about seashores and it has to be aroung grade 6 level thank u?

    asked on May 12, 2012
  13. language arts/math

    what is an irregular polygon. what is congruent. what are corresponding angles. what are corresponding sides. FULL SENTENCES PLZZZ!!!!

    asked on April 22, 2012
  14. language arts

    can anyone plz tell me a gud story if u were evr a shape for example this wut my friend her shape was a rectangle she wrote that the rectangle is going to apply for a job and the job is of an ice cream cart meaning like the ice cream cart and at the end

    asked on April 4, 2012
  15. science

    what are the characteristics of plants and animals

    asked on April 3, 2012
  16. calculus

    y'=xy/2ln y how do you solve the differential equation by seperation of variables

    asked on March 17, 2011
  17. SCIENCE!!!!!!!!!!

    a. Find the speed required to throw a ball straight up and have it return 6 seconds later. Neglect air resistance. b. How high does the ball go? Please Help!! Thanks!! :)

    asked on September 20, 2010
  18. SCIENCE!!

    a. When a ball is thrown straight up, by how much does the speed decrease each second? b. After the ball reaches the top and begins its return back down, by how much does its speed increase each second? c. Compare the times going up and coming down. Please

    asked on September 20, 2010
  19. English

    Name a database that would help you with current events. Please Help!! Thanks!!

    asked on September 20, 2010
  20. English

    What is the subject covered in the encyclopedia with the call number 150 ENC? Please Help :P Thanks!! :))

    asked on September 20, 2010
  21. Judges

    Explain possible consequences of ineffectiveness

    asked on February 15, 2010
  22. Math (PLEASE HELP!!)

    Through how many degrees does the hour hand move... 1. In 3 hours? 2. In 2 hours?___________ 3. In 1 hour?___________ 4. In 1/2 hour?____________ 5. In 10 minutes?___________ Please Help!! Thank You!!

    asked on February 18, 2009
  23. Math (PLEASE HELP!!)

    Through how many degrees does the minute hand move... 1. From 10:00 to 11:00?_______________ 2. From 4:00 to 4:30?_______________ 3. From 6:00 to 6:15?_______________ 4. From 9:00 to 9:05?_______________ 5. From 3:00 to 3:01?_______________ Please Help!!

    asked on February 18, 2009
  24. riddle

    what comes next? O,T,T,F,F,S,S,E,......

    asked on February 8, 2009
  25. English

    Which sentence is better? 1. Between May 15, 1941-July 17, 1941, DiMaggio held the longest consecutive game hitting streak (56 games). 2. Between May 15-July 17, 1941 DiMaggio held the longest consecutive game hitting streak (56 games). Please Help!!

    asked on February 7, 2009
  26. English

    Which sentence is better? 1. On May 15, 1941-July 17, 1941, DiMaggio held the longest consecutive game hitting streak (56 games). 2. On May 15-July 17, 1941, DiMaggio held the longest consecutive game hitting streak (56 games). Please Help!! Thanks!!

    asked on February 7, 2009
  27. spelling

    I am doing a Frayer model and my spelling word is region. That is a non-characteristic for region? Thank you for your help.

    asked on February 4, 2009
  28. Math

    Julia wants to build another garden wall, 10 bricks long and 3 bricks high. Can she build it with red and white bricks, so that no two bricks of the same color are next to each other? r w r w r w r w r w w r w r w r w r w r r w r w r w r w r w I say yes.

    asked on January 29, 2009
  29. Math

    Ray is setting the table for a birthday diner.He needs to set 12 places at a round table.he has 3 different kinds of plates:white plates; blue plates; and gold plates.How can he set the table so that no two of the same kind of plates are next to each

    asked on January 29, 2009
  30. sose

    what is the meaning of life?

    asked on May 20, 2008
  31. CHEMISTRY

    What is the effect of cyclohexane as the solvent in the electrophilic aromatic substitution of acetanilide by bromine?

    asked on January 19, 2008
  32. chemistry

    What is the effect of using cyclohexane as the solvent in the bromination of acetanilide?

    asked on January 19, 2008
  33. chemistry

    Why can't we add charcoal to benzoic acid in purification by sublimation

    asked on November 23, 2007
  34. analytical chemistry

    "experiment: spectrophotometric determination of the acid dissociation constant of methyl red" 1. Why is pH plotted against log([MR-]/[HMR]) to get the pKa of methyl red? 2. Why is it right that HMR has a pH equal to 2 and MR- to have a pH equal to 8?

    asked on September 22, 2007
  35. chemistry

    "experiment: spectrophotometric determination of the acid dissociation constant of methyl red" 1. Why are matched cells used in the experiment? 2. Why is pH plotted against log([MR-]/[HMR])? 3. Why is it right that HMR has a pH equal to 2 and MR- to have a

    asked on September 20, 2007
  36. chemistry

    Why is it important that the sequence of addition of reagents be followed? What could possibly go wrong when this is not followed? Reagents added: 1st: Fe3+ solution 2nd: 2.00 mL 10% NH2OH-HCl (hydroxylamine hydrochloride) 3rd: excess 0.20%

    asked on September 15, 2007
  37. chemistry

    Why is it important that the sequence of addition of reagents be followed? What could possibly go wrong when this is not followed? Reagents added: 1st: Fe3+ solution 2nd: 2.00 mL 10% NH2OH-HCl (hydroxylamine hydrochloride) 3rd: excess 0.20%

    asked on September 15, 2007
  38. chemistry (spectrophotometry)

    I'm sorry but I still don't understand the concept of spectral analysis and the baseline. What does these words mean and what are they for? I'm confused... Note: the experiment determines the concentration of iron in iron(II) phenanthroline by

    asked on September 15, 2007
  39. chemistry

    Why is an Fe3+ solution instead of an Fe2+ solution used in calibrating the spectrophotometer? Note: hydroxylamine hydroxide is added to the Fe3+ solution then 1,10 phenanthroline is added to the solution after the addition of hydroxylamine hydroxide.

    asked on September 15, 2007
  40. chemistry

    Why should an Fe3+ solution be used in calibrating the spectrophotometer for the spectrophotometric determination of iron in Fe2+ complexes?

    asked on September 14, 2007
  41. chemistry

    1. Why Beer's law is expressed in terms of absorbance instead of transmittance? 2. What is the significance of spectral scanning? 3. What is the importance of the baseline?

    asked on September 14, 2007
  42. chemistry

    In experiment concerning potentiometric determination of puriy and Ka of KHP, we obtained an experimental pKa of 5.04 and when compared with the theoretical pKa of 5.51, we obtained a % relative error of 192%. Could this error mean that a cerain impurity

    asked on September 10, 2007
  43. chemistry

    Based on the experimental data, I was able to calculate the experimental pKa value which is 5.04 and the literature value of the pKa for KHP is 5.51. If I would be computing for the relative error between the two pKa's it would be 8.52994555%. But then,

    asked on September 8, 2007
  44. chemistry

    what does it mean if I got a % relative error that is higher than 100%? - would it mean that I did the experiment erroneously?

    asked on September 8, 2007
  45. chemistry

    The phosphorus in a completely dried fertilizer sample weighing 0.4498 grams was precipitated as MgNH4PO4*6H2O. The precipitate weight was determined to be 236.8 mg and ignited to Mg2P2O7. The weight of the ignited precipitate was 268.9 mg. Calculate the

    asked on August 31, 2007
  46. chemistry

    Please help me through this problem... A 0.5117 gram fertilizer containing phsphorus was oven dried. The weight of the dried sample is 0.4998 grams. However, 10% moisture is still retained in the sample. Calculate the moisture content in the sample in as

    asked on August 31, 2007
  47. chemistry

    Please help me with my formal report on "Potentiometric Determination of the Purity and Dissociation Constant of Potassium Hydrogen Phthalate" Please give me links to websites that could be used for my reference... In addition, please do suggest books that

    asked on August 19, 2007
  48. chemistry

    Again, from my previous question about gravimetric analysis... Why can't NH4Cl be used as a substitute for NH3 in precipitating MgNH4PO4*6H2O? Please critique my thought: I found out that a precipitate is more soluble at lower pH and since NH4Cl acidic, it

    asked on August 19, 2007
  49. chemistry

    In precipitating magnesium ammonium phosphate, why can't NH4Cl be used as a substitute for NH3? Isn't pH critical? The solubility is vastly different at pH 9 versus pH 4. In addition, how do you obtain NH3 from NH4Cl? The NH3 is for pH adjustment as Bob

    asked on August 18, 2007
  50. chemistry

    Experiment: Gravimetric Determination of Phosphorus in Fertilizer Samples 1. Can NH4Cl be used as a substitute to precipitate the phosphorus in the sample? Why or why not? - I think, NH4Cl can be used although I'm not quite sure if Cl- ions have some

    asked on August 17, 2007
  51. chemistry

    experiment: Gravimetric determination of moisture in fertilizer samples 1. What are the advantages of weighing by difference to direct weighing when using an analytical balance? 2. Why are the samples grinded before drying in the oven? Weighing by

    asked on August 10, 2007
  52. chemistry

    1. What are other methods of moisture determination besides oven drying? 2. During the drying of samples, the weight is considered constant when the last two weights are within ± 0.0003 grams. What is the reason for this? For #1, here is a site for you to

    asked on August 10, 2007
  53. chemistry

    Topic: Iodometry 1. the reason why the Cu2+ solution has to be titrated immediately after addition of KI - I thought, because if allowed to stand for a long time, iodine will volatilize and a change in concentration of iodine will occur...is this right?

    asked on July 29, 2007
  54. chemistry

    Topic: Iodometry 1. the reason why the Cu2+ solution has to be titrated immediately after addition of KI Answered above.

    asked on July 29, 2007
  55. chemistry

    Topic: Iodometry 1. The importance of precipitating the Cu2+ ions using NH3 and redissolving it with acetic acid 2. What are other means of detecting endpoint in iodometry aside from adding starch indicator 1. A pH that is too low leads to excessive

    asked on July 29, 2007
  56. chemistry

    What is an aliquot factor? It is a whole divisor. For instance 5 is an aliquot factor of 15, and 15 is an aliquot factor of 150. I'm sorry, but I don't seem to understand it. For example, how do you get the aliquot factor of 50? 2, 5, 10, 25 would be

    asked on July 14, 2007
  1. Math

    the last step not clear where did the 2747.08 come from

    posted on November 8, 2017
  2. All about DRAMA! P.S. - Please check!

    akame is right 100%

    posted on April 15, 2017
  3. Math! Pls Help!

    Thanks so much!!

    posted on January 30, 2017
  4. Technology

    Anonymous is correct i just took the test and i got 100% thanks!!

    posted on January 27, 2017
  5. Math

    2.50 x 8.00 = ?, ? x 30.50 = ?, Now what is your answer?

    posted on September 19, 2016
  6. Literature-Poetry

    1. B Correct 2. A Correct 3. B C STUDY GUID 88-93 4. B Correct 5. A Correct 6. B Correct 7. D A STUDY GUIDE 95 8. B Correct 9. C Correct 10. D B STUDY GUIDE 86-87 11. A Correct 12. B Correct 13. D Correct 14. A Correct 15. A D STUDY GUID 86-88 16. C B

    posted on July 9, 2015
  7. physics

    Well I wanted to get answers but I ended up posting an answer instead.

    posted on February 11, 2015
  8. Penn Foster

    D0 Light box

    posted on May 26, 2014
  9. Science data

    well not really because graphs are used to display your data, and just the date would be considered as ur info not the display.

    posted on February 22, 2014
  10. Chemistry

    its wrong!

    posted on July 20, 2012
  11. Math

    u measure

    posted on April 22, 2012
  12. spanish

    i think its nombre

    posted on April 22, 2012
  13. life orientation

    pollution, landfills, animals homes destroyed, less space on earth,

    posted on April 22, 2012
  14. Health: 6th grade

    do u mean sling?

    posted on April 5, 2012
  15. math

    Well - Two fractions equivalent to 2/5: 4/10 an d6/15. - Two fractions equivalent to 7/11: 14/22 and 21/33. - Two fractions equivalent to 150/325: 300/650 and 450/975. To solve this you should of multiplied each fraction by a number (E.G. 2/2) For 2/5, I

    posted on November 13, 2011
  16. math

    What is a g

    posted on April 12, 2011
  17. Chem.

    Its name is methyl ethanoate. First, you must find the carboxylate part. In your case, this is ethanoate. Next, determine what is attached to the O (not the one double bonded to C) of the carboxylate. In your case, this is CH3 and you would call this

    posted on June 8, 2009
  18. Chem help

    ln(K1/K2)=(∆Horxn/R)((1/T2)-(1/T1)) ln((6.5x10^-2)/K2)=((-49.5 kJmol^-1)/R)((1/(250+273.15))-(1/(100+273.15))) That's it! Just solve for K2. Don't forget that your R must have the units of kJ/molK. Hope this helps. Cheers!

    posted on June 8, 2009
  19. chem

    you have 157.5 mmol of AgNO3 and 243 mmol of MgCl2. From the balanced chemical equation, 1 mol of MgCl2 would consume 2 moles of AgNO3. It would then require 315 mmol of AgNO3 to completely consume the MgCl2. Therefore, AgNO3 is the limiting reactant and

    posted on June 8, 2009
  20. riddle

    argh!!

    posted on February 8, 2009
  21. riddle

    Here is another one: J,F,M,A,M,J,J,A,.....

    posted on February 8, 2009
  22. riddle

    Hint: The answer is not "E".

    posted on February 8, 2009
  23. English

    I think he did set more than 1 0r 2 records, right?

    posted on February 8, 2009
  24. English

    Power & greed are sometimes the main cause of war because: Power: You are strong & want to gain more land, food, things, etc... Definition: The possession of control or command over others; authority. Ability to do or act; capability of doing or

    posted on February 8, 2009
  25. English

    Actually, I wanted to use the sentence below: During May 15-July 17, 1941, DiMaggio held the longest consecutive game hitting streak (56 games). Does that make sense? **It makes more sense because it was during that year, not between it. Thanks!!

    posted on February 8, 2009
  26. English

    which sentence is correct, #2 or #3? SraJMcGin chose #2 & Ms. Sue chose #3. I do not know which one to choose..... HELP!!

    posted on February 7, 2009
  27. Chemistry------DrBobb..

    hi

    posted on February 7, 2009
  28. english

    hi

    posted on February 7, 2009
  29. Ionic Crystal Structures

    How did you get that answer then?

    posted on February 7, 2009
  30. spelling

    I'm sorry yes. could you tell me what is a non characteristic of region? Please help, thank you.

    posted on February 4, 2009
  31. Math

    A trapezoid, parallelogram, and rhombus. they all have 45 degrees angles.

    posted on January 28, 2009
  32. Math

    a parallelogram.

    posted on January 28, 2009
  33. chemistry

    what is apectral scanning? I really don't have an idea on this. As for the baseline, we indicated a range of 350 nm to 600 nm in the spectrophotometer and found that lambda max is at 510.4 nm. What then is the significance of the baseline?

    posted on September 14, 2007
  34. chemistry

    Based on the experimental data, I was able to calculate the experimental pKa value which is 5.04 and the literature value of the pKa for KHP is 5.51. If I would be computing for the relative error between the two pKa's it would be 8.52994555%. But then,

    posted on September 8, 2007
  35. chemistry

    So, the moisture content (as received) is ((0.5117-0.4998)/0.5117)* 100 = 2.326% and the the moisture content (dry basis) is ((0.1*0.4998)/0.5117)*100 = 9.767% and when the sample is completely dried, it would weigh 0.4998-(0.1*0.4998) = 0.4498 Am I right?

    posted on August 31, 2007