1. physics

    The system of small objects shown in the figure below is rotating at an angular speed of 2.0 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened to 0.15

    asked by mark on April 5, 2016
  2. chemistry

    The specific heat capacity of gold at 25°C is 1.290×10-1 J/g/K. For a 5.25×102 g sample of gold, how much will the temperature increase if 6.908×102 J of energy is put into the system? (Assume that the heat capacity is constant over this temperature

    asked by korko on September 25, 2014
  3. Physics!

    A 20 kg square slab with side lengths 3.0 m rotates around an axis perpendicular to the slab. A particle of mass 0.60 kg sits on each of the corners of the square. Also, a particle of mass 0.80 kg sits at the center of each of the edges. What is the moment

    asked by Lilly on June 9, 2012
  4. HCA/220

    Hello, I am working on an assignment and I am stuck. Was wondering if you can help? This assignment states: determine the primary function of the following system components. Then states Function- What is the type of muscle movement involved with each

    asked by Nikol on October 28, 2010
  5. chemistry

    Calculate the freezing point of a solution contaning 5.0 grams of KCl and 550.0 grams of water. answer is -0.45 C but i don't know how to get here

    asked by Paloa on October 4, 2012
  6. chemistry

    If you made up a solution of NaOH by adding 0.010 mole of solid NaOH to 1.0 liter of distilled water, what would be the concentration of the OH-(aq)?

    asked by carli on April 29, 2013
  7. chem

    The solubility product of Mg(OH)2 is 1.2 x 10^-11. What minimum OH- concentration must be attained (for example, by adding NaOH) to decrease the Mg concentration in a solution of Mg(NO3)2 to less than 1.0 x 10^-10 M (molar)?

    asked by Mischa on November 1, 2008
  8. chemistry

    How many mL of 0.250 M MgCl2 must be added to 350.0 mL of 0.250 M NaCl to produce a solution in which the concentration of chloride ion is 0.300M Cl-?

    asked by Holly on August 30, 2011
  9. Chemistry

    Can calcium hydroxide solution be used to distinguish Co(NO3)2 and Fe(NO3)3 solutions using only the titration technique? Justify your answer with an explanation.

    asked by Ella on September 23, 2013
  10. Chemistry

    I have two questions that I do not know how to answer. Thanks for your help! 1. Calculate the [OH^-], [H^+], pH, and pOH for a 0.50M solution of CN^- 2. Calculate the molar solubility of PbCl2 in 0.40M KCl

    asked by Liz on January 11, 2015
  11. chemistry

    the concentration of urea (MW=60.0g/mol) in a solution prepared by dissolving 23g of urea in 64g of H2O is ____ molal

    asked by Lanna on August 19, 2018
  12. Science-Chemistry

    Calculate the number of grams of carbon dioxide that can be absorbed by a complete reaction with a solution that contains 5.00 grams of sodium hydroxide

    asked by Kelsey on December 2, 2010
  13. chemistry

    Find the pH during the titration of a 20.00mL of 0.1000 M butanoic acid, CH3CH2CH2COOH (Ka=1.54 x10^-5), with the addition of 10 mL of 0.1000 M NaOH solution??

    asked by anonymous on April 9, 2012
  14. chemistry

    IF 10ml of H2SO4 is need to neutralize 20ml of 1N NaOH, how many milliliters of H2SO4 is needed to make 1 liter of 11M solution?

    asked by sp on September 8, 2010
  15. chemistry

    You wish to prepare a 10% CaCl2 solution. Only CaCl2 * 10H2O is availalbe. How many grams of the hydrated compound are required for 250ml of the reagent? Ca=40 Cl=35.5

    asked by j on September 5, 2010
  16. Chemistry

    When one of the following substances is dissolved in water, the only positive ions in the solution are hydrogen ions. NaOH NaH H2S Nh3

    asked by Christian on February 25, 2012
  17. Chemistry

    A 4g sugar cube(sucrose: C12H12O11) is dissolved in a 350ml teacup of 80 degree water. what will be the molality of the sugar solution.

    asked by Evans on May 10, 2018
  18. chemistry

    What mass of KCl \rm KCl is needed to precipitate the silver ions from 13.0mL mL of 0.200 M M AgNO 3 \rm AgNO_3 solution

    asked by Anonymous on September 29, 2013
  19. chemistry

    What mass of benzoic acid CH6H5COOH, would you dissolve in 400.0 mL of water to produce a solution with a pH= 2.90? Ka= 6.3 x 10^-5 mass in grams is needed.

    asked by papermate on April 11, 2011
  20. Math

    start with the word RODE. change one letter at a time to form a new until u have the word FILM. the best solution has the fewest steps.

    asked by walter on December 16, 2010
  21. Chemistry

    Considering the effect of ionic strength, calculate the solubility of BaSO4 in 0.100 mol/L NaCl solution Ksp of BaSO4 = 1.1 X 10^-10

    asked by Patel on October 20, 2008
  22. chemistry

    What is the final concentration (in M) of 17.6 mL sodium chloride solution with an initial concentration of 1.86 M which is diluted with 18.9 mL of solvent? Assume the volumes are additive.

    asked by Anonymous on April 12, 2012
  23. Chem II

    Ammonia is a weak base. If Ammonium nitrate is added to it, the pH of the ammonia solution will _____________ (increase, decrease, stay the same)

    asked by Ken on April 14, 2008
  24. Chemistry

    How does one calculate the pH of a solution that is only 1.84% ionised? determine the concentration of the H+, which will be in a monoprotic acid, concentration * decimal percent. then determing pH in the normal way.

    asked by Fiona on May 20, 2007
  25. Chemistry

    How long (in seconds) does it take to deposit 1.065e+001 g Zn on a steel gate when 2.375e+001 A are passed through a ZnSO4 solution?

    asked by Jon on January 11, 2015
  26. Chemistry

    h2so4 is labelled as 9.8 by weight. specific gravity of h2so4 is 1.8. the volume of acid to be taken to prepare 100 ml of 0.18M solution is?

    asked by Anonymous on September 3, 2017
  27. chemistry

    Given that a 0.160 M HCl(aq) solution costs $39.95 for 500 mL , and that KCl costs $10/ton, which analysis procedure is more cost-effective?

    asked by madie on September 11, 2015
  28. chem

    A 120.0 mL buffer solution is 0.105 M in NH3 and 0.135 M in NH4Br, What mass of HCl could this buffer neutralize before the pH fell below 9.00?

    asked by moe on October 25, 2010
  29. Chemistry

    Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 2.640. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. I need to know what equations to use to find the answer not just how to get it

    asked by Sonya on February 23, 2014
  30. Chemistry

    If a chemist titrates 120.0 mL of NaOH with a 5.0 M solution of HCl and requires 56.0 mL of the acid to reach the endpoint, what is the concentration of the NaOH?

    asked by Anonymous on February 17, 2012
  31. Chemistry

    If I spill 100ml of a .5 M H3PO4 solution, how many grams of NaOH should be dissolved in water and added to the spill to neutralize the acid?

    asked by Loretta on October 10, 2012
  32. Chemistry

    Calculate the mass percent of a NaCl solution in which 158g of NaCl is dissolved in 3.81L of water at 25 ∘C (density = 0.997 g/mL).

    asked by Alicia Estrada on June 16, 2015
  33. Chemistry

    To what volume must 10ml of 5M HCl be diluted to make a 0.5M HCl solution......???? A.1ml B.50ml C.100ml D.500ml E.1000ml

    asked by Sawera on October 29, 2016
  34. science..chemistry

    given the solubility product;Ksp,of calcium hydroxide is 0.0000064M,caculate its solubility at this temperature in i.water ii.0.1M calciumchloride solution

    asked by kange on April 26, 2012
  35. Chemistry

    What is the molarity of each ion present if 18.0 g of Al2(SO4)3 is present in 201 mL of solution? _____ M Al3+ _____M SO42-

    asked by Anonymous on October 28, 2016
  36. Chemistry

    What is the molarity of each ion present if 18.0 g of Al2(SO4)3 is present in 201 mL of solution? _____ M Al3+ _____M SO42-

    asked by Anonymous on October 28, 2016
  37. math

    A 12-meter high post casts a 19-meter shadow. Find the angle of elevation to the sun. -what is/are given? -formula used -solution

    asked by Daniela on February 20, 2017
  38. Chemistry

    How many grams of sucrose (C12H22O11) must be dissolved in 60 g water to make a solution in which the mole fraction of sucrose is 0.2? Answer in units of g.

    asked by Cheyenne on September 23, 2010
  39. Chemistry

    Calculate the molar mass of a molecular compound if a solution of 6.70 g of the compound in 22.60 g of water boils at 100.78 degrees C (at 760mmHg).

    asked by chemwizard on February 23, 2017
  40. chemistery

    the mass percent of a solution prepared by dissolving 0.500 moll KCL ( Molar mass = 74.6 g) in 850 g of water is ?

    asked by ogb on December 9, 2012
  41. chemistry

    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?

    asked by Lisa on December 13, 2010
  42. Chemistry

    Calculate the volume 0.1 M of acetic acid and 0.1 M sodium acetate required to prepare 300 mL of 0.05 M acetate buffer solution at pH 5.5.

    asked by Anonymous on October 26, 2015
  43. Chemistry

    What is the pH change of a 0.220M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.155M with no change in volume?

    asked by Samantha on June 16, 2015
  44. Chemistry

    What minimum number of moles of NH4Cl must be added to 1.0 liter of solution that is 0.10 M in Mg(NO3)2 and 1.0 M in NH3 to prevent precipitation of Mg(No3)2?

    asked by Ana on October 24, 2010
  45. Chemistry

    If I spill 100ml of a .5 M H3PO4 solution, how many grams of NaOH should be dissolved in water and added to the spill to neutralize the acid?

    asked by Loretta on October 10, 2012
  46. Chemistry

    If a chemist titrates 120.0 mL of NaOH with a 5.0 M solution of HCl and requires 56.0 mL of the acid to reach the endpoint, what is the concentration of the NaOH?

    asked by Spacy1996 on February 17, 2012
  47. AP Chemistry

    How many grams of sucrose (C12H22O11) must be dissolved in 60 g water to make a solution in which the mole fraction of sucrose is 0.4? Answer in units of g.

    asked by Matt on September 19, 2012
  48. Chemistry

    What is the pH of a 1.24 mol/L solution of HCN(aq) if its Ka = 6.2 x 10^-10? I am not sure how to this question... I did 6.2x10^-10/ 1.24?? I am not sure if it is right OR are we suppose to find the Kb value which i already did Kb= kw/ka =

    asked by Lloyd on April 10, 2008
  49. 8 grade math

    Can somebody please help me I don't understand this problem.? Determine whether each ordered pair is solution of y=x+3. 1. (2, 9) 2. (5, 23) can you please explain this to me step by step till you get the answer .thank you so much.

    asked by jenn k on August 22, 2013
  50. physics

    A 2-kilogram ball is accelerated from rest to a speed of 8 m/sec. What is the ball`s change in momentum? Looking for? Given? Relationship?(formula) Solution?

    asked by mya on November 18, 2014
  51. Biochemistry

    Calculate the ph of a 1L solution to wgich has been added 25ml of 10mM acetic acid and 25ml of 30mM sodium acetate

    asked by Grace on July 23, 2017
  52. math

    Please anyone to help the solution and the answer# A piece of copper wire is 52 2/3 m long. If each piece has been cut of 3/4 m from it. What length will remain after cutting pieces?

    asked by kelvin on July 23, 2018
  53. Chemistry

    If the osmotic pressure of urea (CH4N20) in water is measured at 0.0259 atm at 25 degress C what is the molartiy of the urea solution?

    asked by Shelly on December 10, 2012
  54. algebra 2

    a. find the value of the discriminant b. describe the number and type of root c. find the exact solution by using quadratic formula 1. p^2+12p=-4 2. 9x^2-6x+1=0 3. 2x^2-7x-4=0

    asked by Reina Bonilla on December 14, 2014
  55. Chemisty

    if the chemist mistakenly makes 275 ml of solution instead of the 200ml, what molar concentration of sodium nitrate will the chemist have actually prepared

    asked by Jayla on February 16, 2017
  56. chem

    A hydrofluoric acid buffer solution has the following concentrations: [HF]=0.43M [F-]=0.45M If 40 mL of 0.1M NaOH is added to 500 mL of the buffer, what is the resultant pH?

    asked by Jess on April 19, 2012
  57. chemistery

    The forensic technician at a crime scene has just prepared a luminol stock solution by adding 11.0 of luminol into a total volume of 75.0 of .

    asked by Anonymous on September 25, 2010
  58. chemistry

    Calcium chloride, CaCl2, has been used to melt ice from roadways. Given that a solution is 25% CaCl2 by mass, estimate the freezing point.

    asked by Akkam on December 20, 2010
  59. Operations research

    36) Consider the following minimization problem: Min z = x1 + 2x2 s.t. x1 + x2 ≥ 300 2x1 + x2 ≥ 400 2x1 + 5x2 ≤ 750 x1, x2 ≥ 0 What is the optimal solution?

    asked by Pauline on December 12, 2010
  60. Chemistry

    What is the freezing point of each solution? a)1.40mol Na2SO4 in 1750 g H2O b)0.060 mol MgSO4 in 100g H2O

    asked by Jack on April 29, 2010
  61. chemistry

    In a 1.0x10^-4 M solution of HClO(aq), identify the relative molar amounts of these species:HClO, OH-, H3O+, OCl-, H2O

    asked by karla on October 12, 2012
  62. Chemistry

    What is the osmotic pressure of a 50% sucrose solution at a temperature of 37 degrees celcius with a molar mass of sucrose of 342.30 grams

    asked by Ruffles on December 4, 2013
  63. math

    What does "give a brief explanation as to what kind of solution(s) you expect the linear equation to have: 18x+1/2=6 (3x+25). Transform the equation into a simpler form if necessary" mean?

    asked by Samantha on January 23, 2014
  64. Biology

    Need to write a brief description of the procedure required to make 900mL of a 0.5 M NaCl solution. The formula weight of NaCl is 58.4g/mole.

    asked by Debbie on September 23, 2012
  65. chemistry

    How many milliliters of a 0.16 M HCl solution are needed to react completely with 4.8 g of zinc to form zinc(II) chloride? Answer in units of mL

    asked by cheri on September 19, 2012
  66. Math. - Please Help.!

    a^2 - 10ab + 3b^2 *I need a lot of help with this.How do I do this one.? Try: (a + r b)(a + s b) Then: r + s = -10 r*s = 3 From the first equation: s = -(10 + r) Inserting in second expression: r*(10 + r) = -3 --> r^2 + 10 r + 3 = 0 ---> r = 5 +/-

    asked by [C]razy Baby.-[iloveyou] (Margie) on February 9, 2007
  67. chemistry

    If the mole fraction of sulfuric acid (H2SO4) in an aqueous solution is 0.325, wat is the percent by mass of H2SO4?

    asked by Lola on May 23, 2010
  68. Chemistry

    A 100.0 ml sample of .50 M HCl (aq) is titrated with a .10 M NaOH. What volume of the NaOH solution is required to reach the endpoint of the titration?

    asked by Arianna on March 13, 2012
  69. chemistry

    Need to write a brief description of the procedure required to make 900mL of a 0.5 M NaCl solution. The formula weight of NaCl is 58.4g/mole.

    asked by Debbie on September 24, 2012
  70. chem

    How many grams of NaOH must be dissolved in water to make 750ml of 1.7 M solution? (molecular weight of NaOH = 4Og/mol)

    asked by nero on May 11, 2012
  71. chemistry

    A 600ml sample of a saturated solution of MgCO3 is reduced to 125 ml by evaporation. What mass of MgCo3 is formed? Ksp=4*10^-5

    asked by maureen on March 25, 2012
  72. chemistry

    Determine the maximum mass of calcium iodate that can be dissolved in a 10.0L jug of 3.25x10^-2 molar calcium sulphide solution.

    asked by Kayleigh on January 29, 2013
  73. chemistry

    How many grams of KCl are required to make .75 L of 0.29 M solution? Round to one decimal place. i got .2907 is this correct im not sure about the decimal places thanks

    asked by amber on October 4, 2010
  74. Chemistry

    An aqueous solution of volume 7 dm3 is obtained by dissolving 5.5 kg of C12H22O11 in enough water. express the concentration in mol/L and mol/Kg

    asked by Susan on May 10, 2012
  75. chemistry

    Calculate the mass percent concentration of a solution made by dissolving 5.00g of NaCl in 25.0g of water? I got 5.00g/25.0g=0.2 x 100= 20% Is this right?????

    asked by Sarah on November 21, 2011
  76. chemistry volume problem

    Can someone please explain to me how to do this?! I am completely lost. Calculate the volume indicated for each of the following: liters of a 2.00M KCl solution to obtain 0.600mol of KCl.

    asked by chelsea on November 6, 2013
  77. Chemistry

    A solution consisting of 25.00 g Nh4Cl in 178 ml of water is titrated with 0.114M KOH. How many mL of KOH are required to reach the equivalence pt?

    asked by Ashley on March 24, 2011
  78. Chemistry

    An aqueous solution of volume 7 dm3 is obtained by dissolving 5.5 kg of C12H22O11 in enough water. express the concentration in mol/L and mol/Kg

    asked by Susan on May 13, 2012
  79. math

    What does "give a brief explanation as to what kind of solution(s) you expect the linear equation to have: 18x+1/2=6 (3x+25). Transform the equation into a simpler form if necessary" mean?

    asked by Samantha on January 23, 2014
  80. Chemistry Homework

    Hello! Could someone help me with this? I'm confused on what to do. Thanks!! The mole fraction of carbon dioxide (CO2) in water is 0.25. Determine the molarity of CO2. The density of the solution is 1.0 g/mL.

    asked by Amber on April 5, 2017
  81. Chemistry

    The concentration of fluoride ions in a saturated solution of barium fluoride is __________ M. The solubility product constant of BaF2 is ???

    asked by Jane on December 2, 2014
  82. chemistry

    i need help with finding the ph of a buffer solution initially consisting of 0.0400 moles NH3 and 0.025 moles NH4^+ and 20 ml 0.75 NaOH. ka of NH+4 = 5.6 ×10^-10

    asked by joelle on March 19, 2012
  83. math

    ms.pritchard wrote the following inequality on the board 5.6 with the sign greater on equal to then negative fourteen what should be the solution set for the inequality

    asked by brooke on February 27, 2011
  84. chemistry

    i need help with finding the ph of a buffer solution initially consisting of 0.0400 moles NH3 and 0.025 moles NH4^+ and 20 ml 0.75 NaOH. ka of NH+4 = 5.6 ×10^-10

    asked by joelle on March 19, 2012
  85. chemistry

    If 0.2g of iodine is stirred in 100cm3 of water at 298k till equilibrium is reached what will be the mass of iodine found in solution

    asked by saquib on May 26, 2015
  86. math

    How many of the first 1001 Fibonacci numbers are divisible by 3? I know the correct answer is 250....... but i need solution of how it comes out to be 250........ kindly hellp me sooooooooooon

    asked by jamesbond on May 12, 2013
  87. chemistry

    25.0g of 5.0% (by mass) acetic acid solution are titrated with 0.300 M NaOH. What volume of NaOH will be needed to neutralize this sample?

    asked by Cynthia on May 28, 2010
  88. chemistry

    What mass of silver nitrate (AgNO3) is re- quired to prepare 400 g of a 3.50% solution of AgNO3? 1. 14 g 2. 0.00875 g 3. 114.28 g 4. 1400 g

    asked by cheri on September 19, 2012
  89. AP Chemistry

    How many milliliters of a 0.62 M HCl solution are needed to react completely with 4.7 g of zinc to form zinc(II) chloride? Answer in units of mL

    asked by Gabriella on September 10, 2013
  90. Chemistry

    how many milliliters of a 0.78 M HCl solution are needed to react completely with 6.4 g of zinc to form zinc(II) chloride? Answer in units of mL.

    asked by Nathan Espinosa on October 5, 2010
  91. chem

    calculate the solubility of barium sulfate (Ksp=1.1x10^-10) in a) water b) a 0.10 M barium chloride solution help is GREATLY appreciated

    asked by brooke on March 18, 2012
  92. Chemistry

    Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic metal. M(OH)2 (s) M^2+ (aq) + 2OH- (aq) Ksp=4e-16 M(OH)2 (s) + 2OH- (aq) M(OH)4 ^2- (aq) Kf=0.06 Estimate the solubility of M(OH)2 in a solution buffered at pH= 7.0, 10.0, and 14.0 I'm not

    asked by anon on May 9, 2012
  93. Chemistry

    If the Ka of a monoprotic weak acid is 4.5x10^-6 what is the pH of a .10M solution of this acid. I don't even know how to start this problem, I'm totally lost please help!

    asked by Molly B on July 13, 2013
  94. History

    What things need to be considered in finding a solution for the oil problem in the Middle East? What obstacles are there in solving the oil issue?

    asked by Christian on February 25, 2008
  95. Chemistry

    Hi! I am totally stuck on this question: Explain why a cool flame is important to use in heating a solution to dryness. Can you please explain to me exactly why because I really do not understand. thank you!

    asked by Abigail on September 9, 2015
  96. Algebra-help please

    I already asked this question once about the absolute value of 3x-2=8 and absolute vale x+1=1....value of x?...and the answer I received was does 0 or -2 satisfy both ....they dont...so is it no solution? Please help - I do not understand this

    asked by Deborah on February 1, 2013
  97. Math

    Calculate the sum from k=1 to infinity (or n) of (k^4)- (k-1)^4 It says that the solution is n^4, but I do not know why, I tried separating it in a telescoping sum, and expanding it, but I obtain at the end more values than expected. Please help

    asked by Amy on November 13, 2018
  98. chem

    Determine whether Cd^2+ can be separated from Zn^2+ by bubbling H2S through a 0.3 M HCl solution that contains 0.005M Cd^2+ and 0.005 M Zn ^2+. Ksp for CdS is 8*10^-7. Ksp for ZnS is 3*10^-2

    asked by coleman on December 15, 2010
  99. Chemistry

    Hydrocyanic acid has a Ka of 4.0 X 10-10. What is the percent of ionization of a 1.0 molar solution? my answer is 0.004% is this correct? a) 0.004% b) 0.0020% c) 0.0004% d) 0.02%

    asked by Centhia on May 10, 2010
  100. chemistry

    For the following reaction in acidic solution. Cr2O7^2- + I- ---> Cr^3+ + IO3- give the balanced half reduction reaction. Indicate the oxidizing species.

    asked by Annie on June 17, 2013

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