ericka

Most popular questions and responses by ericka
  1. 1 math question

    Which is J = 4rb solved for r? a. r = J/4b ** b. r = 4b/J c. r = J - 4b d. r = J/b

    asked on January 8, 2016
  2. Chemistry

    Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10-2 hr-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

    asked on December 10, 2009
  3. physics

    A 1.5-kg block rests on top of a 7.5kg block. The cord and pulley have negligible mass, and there is no significant friction anywhere. Part a) What force F must be applied to the bottom block so the top block accelerates to the right at 2.9 m/s^2 ? Part b)

    asked on May 7, 2012
  4. chemistry

    A buffer is made by adding 0.300 mol HC2H3O2 and 0.300 mol NaC2H3O2 to enough water to make 1.00 L of solution. The pH of the buffer is 4.74 . Calculate the pH of this solution after 0.020 mol of NaOH is added.

    asked on December 10, 2009
  5. Science

    CH4 + 20 2 --> CO2 + 2H2O How many liters of CO2 would be produced if 32 grams of CH4 are combined with oxygen??? How many grams of H2O would be produced when the 32 grams of CH4 are burned???

    asked on April 1, 2011
  6. Chemistry

    The Ka of hydrazoic acid (HN3) is 1.9 × 10-5 at 25°C. What is the pH of a 0.35-M aqueous solution of HN3?

    asked on December 10, 2009
  7. physics

    Given: latent heat of fusion of water 3.33x10^5 J/kg. A 147 g cube of ice at 0 degress C is dropped into 1.3 kg of water that was originally at 79 degrees C. What is the final temperature of the water after the ice melts.

    asked on December 8, 2009
  8. Chemistry

    The approximate concentration of a hydrochloric acid solution is 0.5M. The exact concentration of this solution is to be determined by the titration with 0.5M solution of sodium hydroxide. A 10.00 ml of HCl solution was transferred by pipet to an

    asked on May 17, 2015
  9. chemistry

    If the concentration of Pb2+ is found to be 2.3 x 10-9 mol/L in a saturated solution of Pb3(PO4)2, what is the Ksp of Pb3(PO4)2 ?

    asked on April 19, 2008
  10. chemistry

    24 mL of 0.39 mol/L acetic acid is titrated with a standardized 0.33 mol/L KOH solution. Calculate the pH of the solution after 17 mL of the KOH solution has been added. Assume the Ka of acetic acid is 1.8 x 10-5.

    asked on April 19, 2008
  11. math

    If someone's height is six feet and is enlarged to 16.8 inches, what is the scale factor?

    asked on January 20, 2011
  12. chemistry

    24 mL of 0.39 mol/L acetic acid is titrated with a standardized 0.33 mol/L KOH solution. Calculate the pH of the solution after 17 mL of the KOH solution has been added. Assume the Ka of acetic acid is 1.8 x 10-5.

    asked on April 19, 2008
  13. chemistry

    24 mL of 0.39 mol/L acetic acid is titrated with a standardized 0.33 mol/L KOH solution. Calculate the pH of the solution after 17 mL of the KOH solution has been added. Assume the Ka of acetic acid is 1.8 x 10-5.

    asked on April 19, 2008
  14. History

    I need help please I am not understanding what my instructor means by "trace the contextof the question across the entire sweep of time, from pre history to c. 1500CE, converting at least 3 separate eras as they are viewed in at least three world culture

    asked on February 15, 2013
  15. statistics

    The data set given below has y^ = 3x - 5 for its regression equation. Find the standard error of estimate. x 3 2 5 8 y 4 1 10 19 A) 1.29 B) 0 C) 2.06 D) 0.17

    asked on March 23, 2012
  16. physics

    Question # 1 : What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.82? Question # 2 : A 1.5-kg block rests on top of a 7.5kg block. The cord and pulley have negligible mass, and

    asked on May 7, 2012
  17. Pre-Calculus

    A surveyor measures the distance between buildings X and Y as 200 feet. The angle of elevation from the base of X to the top of Y is 25 degrees. What is the height of building Y?

    asked on May 20, 2013
  18. Chemistry

    A student performed an experiment to determine the molecular weight of a gaseous compound. Using the ideal gas law PV = nRT, and knowing the pressure, temperature, and volume of the vapor, the student calculated the number of moles of gas, n, to be 0.0443

    asked on November 15, 2015
  19. Math Finite

    How many years will it take for $12,000 to grow to $15,000 at 5.75% compounded monthly?

    asked on December 8, 2010
  20. Science

    A rectangular brick measures 6cm by 9cm by 20cm and has a mass of 2.563 kilograms. What is the density of the brick in grams per cubic centimeter?

    asked on October 27, 2013
  21. Math

    Flying against the wind, an airplane travels in hours. Flying with the wind, the same plane travels in hours. What is the rate of the plane in still air and what is the rate of the wind? Rate of the plane still in the air= ____km/h Rate of the wind=

    asked on April 14, 2010
  22. Finite Math

    Two balls are drawn from a bag with 4 black balls and 2 white balls. Find th probability distribution got drawing 2 black balls.

    asked on June 16, 2013
  23. math

    5th grade math equations

    asked on September 25, 2012
  24. Finite Math

    What interest rate, compounded weekly, would you need to be paid in order to grow an $8000 investment into $12,000 over a ten year period?

    asked on December 7, 2010
  25. Finite Math

    What interest rate, compounded monthly, would you need to be paid in order to grow a $2000 investment into $3500 over a five year period?

    asked on December 7, 2010
  26. math

    3x^2+11x+5=15?

    asked on December 1, 2010
  27. Chemistry

    10g of Sodium Chloride are dissolved in 200ml of H2O. What is the mass percentage of solute in this solution?

    asked on December 10, 2009
  28. Percy Jackson:Lightning Thief

    What is the motif in "Lightning Thief" ?

    asked on August 27, 2013
  29. fractions

    Write the following fraction as a numeral: One piece of pie from a pie that is cut into six parts. Please check: 1/6

    asked on August 21, 2013
  30. World civilizations

    Although most students begin by assuming settled farming life was better than that lived by hunter-gatherers, closer acquaintance with full Paleolithic Hunter-Gatherer life shows us many aspects that could be considered easier than that of very early,

    asked on January 28, 2013
  31. Biology

    A student claims the probability a human sperm will receive all chromatids of maternal origin is 50 %. Explain why she is wrong.

    asked on September 17, 2011
  32. Biology

    A student claims the probability a human sperm will receive all chromatids of maternal origin is 50 %. Explain why she is wrong.

    asked on September 17, 2011
  33. Math Finite

    A two card hand is dealt from a standard deck. What is the probability of drawing at least one face card?

    asked on December 9, 2010
  34. interior decorating

    historically, who influencedthe style and trends of art, architecture, furniture and fashion? a. interior designers b. upper class c. architects d. artists

    asked on December 7, 2010
  35. Chemistry

    I have to list all of the ions of zinc, the thing is, the only ion I could find was Zn^2+. I've googled "ions of zinc" but this was the only one I could find. Are there any others? Thanks.

    asked on April 22, 2009
  36. geometry

    the supplement of an angle is 15 degree less than twice the angle.find the measure of the angle and its supplement.

    asked on January 3, 2017
  37. geometry

    the complement of an angle is 18 degree more than the angle.find the measure of the angle and its complement.

    asked on January 3, 2017
  38. world history

    According to Aristotle , what makes the rich and downtrodden poor rulers?

    asked on December 12, 2015
  39. fractions

    What are some helpful hints or tips about fractions?

    asked on August 22, 2013
  40. Percy Jackson:Lightning Theif

    I have to print some pictures about or from the book "Lightning Theif" Does anyone know some pictures? *It cannot be from the movie.

    asked on August 3, 2013
  41. physcis

    What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.82?

    asked on May 7, 2012
  42. physics

    Question # 1 : What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.82? Question # 2 : A 1.5-kg block rests on top of a 7.5kg block. The cord and pulley have negligible mass, and

    asked on May 7, 2012
  43. chemistry

    The body-centered cubic unit cell of a particular crystalline form of silver is 2.2887A on each side. Calculate the density of this form of silver?

    asked on December 10, 2009
  44. syllable patterns

    how can you tell rather the first vowel in a word has a long or short vowel and how do you divide them

    asked on October 13, 2009
  45. Chemistry

    What is zinc's hardness (high, medium or low) I found the number on a hardness scale, (2) but I have no idea how the scale works, and if this would be considered high.

    asked on April 22, 2009
  46. HCA 270

    Has anyone taken Axia's HCA 270? Need help on Checkpoint: Ration Analysis.

    asked on November 7, 2008
  47. chemistry

    Find the temperature at which the reaction below is spontaneous given this data: Hfo of NH3(g) = - 46 kJ/mol, So of NH3(g) = 192.5 J/mol·K, So of N2(g) = 191.5 J/mol·K, So of H2(g) = 130.6 J/mol·K. N2(g) + 3H2(g) ßà 2NH3(g)

    asked on April 19, 2008
  48. geometry

    find the measure of an angle whose complement and supplement sum up to 126 degrees

    asked on January 3, 2017
  49. Science

    Which pair of states is most likeley to have a similar climate? Oregón arizona? Virginia and North dokota? Ohio and florida? Kansas and missouri?

    asked on December 7, 2016
  50. Math

    What is a lcm

    asked on August 29, 2016
  51. batlle of seven oaks

    how could the battle of seven oaks be seen as a turning point in metis history?

    asked on December 4, 2015
  52. Algebra

    I'm confused regarding the elimination method for 5x - 7y = -16, 2x + 8y = 26

    asked on November 9, 2013
  53. definition

    What is a motif?

    asked on August 26, 2013
  54. analogies

    How do I put this into 2 sentences? up:down heavy:light For example: water:liquid ice:solid Water is a type of liquid. Ice is a type of solid.

    asked on August 13, 2013
  55. World history

    "As his power grows, Charlemagne proves himself a mastermind, next to military and civil government." In what ways?

    asked on February 14, 2013
  56. physics

    What is the pressure inside a 33.1 L container holding 109.1 kg of argon gas at 399 K?

    asked on November 12, 2012
  57. 9th grade history

    how did mccarthyism affect the lives and political thinkink of th e people in the u s

    asked on September 29, 2009
  1. Math

    umm is the answer 100-(5*4)

    posted on December 13, 2018
  2. Math

    hit or miss

    posted on December 13, 2018
  3. Can someone check these answer for me?

    TySm Nashi ty to u tht I got a perfect 100% suckers yep anon ur wrong and Nashi is right feel the pain ugly

    posted on February 21, 2018
  4. math fraction

    Brain has 3 basketball cards And 5 baseball cards . What fraction of brain's cards are baseball cards?

    posted on March 27, 2017
  5. Algebra

    I think the answer is 20

    posted on September 27, 2016
  6. math

    Dera mom i love you so much do you love me

    posted on February 25, 2015
  7. Science

    All these answers were correct when I used them. I got a 100%! Thank you!

    posted on March 31, 2014
  8. GEOMETRY(SURFACE AREA)

    18.63

    posted on October 14, 2013
  9. Percy Jackson:Lightning Thief

    Ok. What is a motif, though?

    posted on August 27, 2013
  10. physcis

    well noone answered it and so i reposst it. thank you for your responnse but the last message was not needed.

    posted on May 7, 2012
  11. Math

    License plates are made using 2 letters followed by 2 digits. How many plates can be made if repetition of letters and digits is allowed?

    posted on April 21, 2012
  12. Substitution Method in Algebra!HELP PLZ!

    knfnkasnga \

    posted on November 16, 2009
  13. HCA 270

    Sorry, I need help with the whole assignment, CheckPoint: Ratio Analysis. I have no idea what needs to be done to get the answers.

    posted on November 7, 2008
  14. chemistry

    Whats wrong with this answer? Ksp = [Pb2+]^3 [PO4]^2 = (2.3E-9)^3 (2/3 * 2.3E-9)^2 = 4/9 * (2.3E-9)^5

    posted on April 19, 2008
  15. chemistry

    Ionization equation for Pb3(PO4)2 is Pb3(PO4)2 --> Pb^2+ + 2PO4^3- Ksp = [Pb^2+][2PO4^3-] Ksp = [2.3 x 10-9 mol][4.6 x 10-9 mol] = 1.1 x 10-16 mol I am stuck

    posted on April 19, 2008