1. thermodynamics

    A piston-cylinder device contains 100 g of ethylene gas initially at 27oC, 115 kPa. Ethylene is heated and the piston starts to rise until the volume reaches 90 L and merely touches a linear spring that has a spring constant of 60 kN/m. More heat is added

    asked by sara on March 26, 2012
  2. English

    Thank you very much for your corrections. Here are a few more sentences on the same subject I'd like you to check. 1)The Industrial Revolution brought several changes to Britain. First of all, it caused an enormous increase in production and consequently

    asked by Franco on October 11, 2010
  3. cinquain poem

    For social studies we had to make our own 4 topic of cinquain poems. I asked some people and not many knew this type of poem, but one person said it all seem good except for the last lines. Do you think I did the format corret? Thanks for your help

    asked by liz on October 8, 2013
  4. Gen Chem

    Light of wavelength 272 nm shines on a piece of magnesium metal. What is the speed of the ejected electron? (Light energy greater than that of the work function of magnesium ends up as kinetic energy of the ejected electron. The work function is the

    asked by Z on January 18, 2010
  5. Quatitative Analysis

    What is the correct charge balance equation for an aqueous solution of MnCl2 that ionizes to Mn2 , Cl–, MnCl , and MnOH ? What is the correct mass balance equation for the same solution?

    asked by Whitney on September 17, 2013
  6. math

    A hallway measuring 90 feet x 7 feet requires 1/2 a fluid ounce of cleaning solution per square foot. How much cleaning solution is required to clean the hallway

    asked by Anonymous on June 11, 2014
  7. chemistry

    A solution was prepared using 1,00 liter of water, 59 g glucose, and 2,3 g NaCl. One liter of water weighs 1000 grams. The solution needs to be labeled in terms of % glucose and % sucrose.

    asked by Sergejs on September 19, 2014
  8. Chemistry

    Which contains more solute particles a 0.10 M aqueous solution of methanol (CH3OH) or a 0.10 M aqueous solution of table salt (NaCl)? Are we supposed to go M*L=moles*(6.022*10^23 solute particles)

    asked by Felix on November 3, 2018
  9. chemistry

    Assuming that sea water is a 3.5 wt% solution of NaCl in water, calculate its osmotic pressure at 20 deg C. The density of a 3.5% naCl solution at 20 deg C is 1.023 g/mL. How do I go about solving this?

    asked by Sarah on February 28, 2008
  10. working with school aged children

    Which of the following is the final step in problem solving? A. Implement the solution. B. Rule out possible solutions. C. Decide who owns the problem. D. Test the solutions. I would think it would be D since u would have to do the rest of them before you

    asked by Heather on May 16, 2011
  11. chemistry

    for an aqueous solution having Calcl2 (2molar) and Mgcl2 (5molal) and specified gravity of solution is 1.145 calculate molality of chloride ion and molality if chloride ion.

    asked by riya on May 10, 2013
  12. chemistry

    An isotonic solution contains 0.86% by mass per volume. Calculate the percent mass per volume for an isotonic solution of KCl at 30 degrees C. Assume a van't Hoff factor of 1.9.

    asked by Anonymous on February 3, 2011
  13. math

    The equation for the pH of a substance is pH = –log[H+], where H+ is the concentration of hydrogen ions. A basic solution has a pH of 11.2. An acidic solution has a pH of 2.4. What is the approximate difference in the concentration of hydrogen ions

    asked by Anonymous on March 9, 2016
  14. Chemistry

    A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initial volume of H2SO4 was 13.28 and the final volume of H2SO4 was 28.29 mL when the solution turned very slightly pink. What is the concentration of H2SO4?

    asked by Ivy on December 7, 2010
  15. Algebra 2

    Is the solution to this rational expression extraneous? The problem: (2x-3)/7 -(7x)/14 My answer: x = -9/4 My teacher wants to know if the solution is extraneous and I know I have to plug my answer back into the expression to check but I still don't

    asked by Wade on October 7, 2015
  16. Chemistry

    A glucose solution contains 55.0g of glucose C6H12O6 in 475g of water. Compute the freezing point and boiling point of the solution. Assume a density of 1.00g/mL for water.

    asked by Monica on September 18, 2012
  17. Science

    I need to find out if sucrose, sucrose solution, sodium chloride, sodium chloride solution, water, vinegar, and aluminum are electrolytes and what type of bond they are but I don't know where to look.

    asked by Anonymous on December 20, 2009
  18. Chemistry - Equilibrium

    Silver ion concentrations are needed for a solution. You have 0.050 M AgNO3, if you added 5.0mL of 12. M NH3 to 500.mL of this solution, how much silver ion in M will you have at equilibrium? [Kf for Ag(NH3)2+ is 1.5 x 10^7]

    asked by Shawn on April 25, 2012
  19. chemistry

    How would you prepare a solution of about 8mg/100ml of ascorbic acid in water (25ml)? I'm not sure if they mean to use that ratio of ascorbic acid in water to make a 25 ml solution or if the wording means something else.

    asked by solution chemistry on February 22, 2014
  20. Freezing solution

    An ethylene glycol solution contains 26.2g of ethylene glycol (C2H6O2) in 81.4mL of water. Calculate the freezing point of the solution. (Assume a density of 1.00 g/mL for water.) how do I set this up?

    asked by Chemistry on April 27, 2015
  21. chemistry

    please check if I did this right ... calculate the mass of white solid CaCO3 that forms when 98ml of a 0.1M Ca(NO3)2 solution is mixed with 54 ml of a 2.5M Na2CO3 solution. Ca(NO3)2 + 2NaCO3 -> Ca(CO3)2 + 2NaNO3 .098*0.1 =.0090 .054*2.5 =.135 limiting

    asked by Krissy on January 29, 2010
  22. Chemistry

    What does ammonia have anything to do with bogdan's rocket building? -can't find this anywhere if we had to order ammonia we don't order in pure. it is ordered in clandestine, liquid solution. the ammonia exists in this aq solution in eq. what is the eq

    asked by Xi on October 27, 2008
  23. chemistry

    The enthalpy change for the solution process when solid sodium hydroxide dissolves in water is -44.4 kJ/mol. When a 13.6 g sample of NaOH dissolves in 250.0 g of water in a coffee-cup calorimeter, the temperature increases from 23.0 o C to __________ o C.

    asked by Anonymous on November 15, 2010
  24. chemistry 112

    A volume of 60.0mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 19.2mL of 1.50 M H2SO4 was needed? The equation is

    asked by Sam on October 7, 2014
  25. Chemistry

    What does ammonia have anything to do with bogdan's rocket building? -can't find this anywhere if we had to order ammonia we don't order in pure. it is ordered in clandestine, liquid solution. the ammonia exists in this aq solution in eq. what is the eq

    asked by Xi on October 27, 2008
  26. Algebra

    1.Solve 2x = 5x2 for x. A. 2.322 B. 0.431 C. 0 and 2.322 D. 0 and 0.431 2.Which of these is a factor of 2x100 − x7 − 1? A. x B. x − 2 C. x + 1 D. x − 1 3.If P(x) is a polynomial with P(–6) = –1.12 and P(–5) = 0.6 then which of the following

    asked by nash on May 5, 2012
  27. math

    The lengths in inches (x and y) of two fish are related by the equation 5x – 4y = 24. The two ordered pairs that follow are solutions to the equation: (4, -1) (12,9) Which statement best evaluates whether these two solutions make sense in this situation?

    asked by samone on November 4, 2013
  28. physics

    Two factors: 1) the weight of the car is now partially down the cable, it adds to tension: mgsinTheta is the component of weight pulling back on the cable. 2) going up you have mass*acceleration. Total tension: ma +mgsinTheta check my thinking, draw a

    asked by bobpursley on November 13, 2006
  29. microeconomics

    Just when you really, really want an ice cream cone, the price is rising. But it isn't summertime gouging by manfacturers. The cost of milk fat, the principal ingredient in ice cream, jumped 71% druing the past 6 months to 2.22 at the end of June. As a

    asked by Kim on February 21, 2007
  30. DrBob222-re: chem question

    Sorry, I did make an error when I posted the earlier question: It should have said: A solution has [OH-] = 2.0 x 10-^14 M. The [H+] in this solution is? I hope you can help. Thank you. Sorry about the earlier error.

    asked by Cassandra on April 23, 2015
  31. math

    what is the concentration of the mixture of two mixture if two quarts of 30% acid solution is mixed with 3 pints of 20%acid solution

    asked by tasu on June 15, 2016
  32. chemistry

    Suppose you have a solution containing both an iron ii salt and an iron iii salt. how would you proceed to identify both Fe 2+ and Fe 3+ in this solution?

    asked by Ash on February 12, 2013
  33. chemistry

    describe how you would prepare from the specified stock solution: 400 mL of 0.45 M urea starting with a 6 M urea stock solution

    asked by luv2swim on July 24, 2011
  34. science

    what is the concentration of the mixture of two mixture if two quarts of 30% acid solution is mixed with 3 pints of 20%acid solution

    asked by tasu on June 15, 2016
  35. Chemistry

    a sulfuric acid solution that is 65.0 h2so4 by mass has a density of 1.55 g/mL. What is the molality of sulfuric acid in this solution

    asked by Scott on May 31, 2014
  36. hum 111

    How does the process of refining a solution for a problem differ from the process of refining a solution for an issue? Which do you think is more challenging?

    asked by Anonymous on October 25, 2012
  37. chemistry

    25.00 mL of a 2.00 M solution of NaCl is diluted to a final volume of 100.0 mL. What is the concentration of NaCl in the final solution?

    asked by Lia on December 7, 2010
  38. chemistry

    A 45.8mL sample of 5.8M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0 g of KNO3.

    asked by Monique on November 6, 2011
  39. Chemistry

    You have a stock solution of 13.4 M NH3. How many milliliters of this solution should you dilute to make 100.0 mL of 0.100 M NH3

    asked by Nancy on October 15, 2010
  40. chemistry

    Potassium 2:5 Chloride solution 30ml. How many milliliters of a potassium chloride 3:5 solution do you need to prepare the order?

    asked by chi on July 28, 2014
  41. Chemistry Lab

    You need 123 mL of 0.245 M NaOH solution for a certain experiment, and the only solution available in the lab is 1.252 M. How many mL OF THE 1.252 M NaOH would you need?

    asked by Thao on May 10, 2011
  42. algebra

    how many liters of distilled water must be added to 80 liters of 60% acid solution to obtain a 50 % acid solution?

    asked by cheszka on June 8, 2017
  43. Math

    How many milliliters of pure acid must be added to 150 milliliters of a 70% solution of acid to obtain a 80% solution?

    asked by Anonymous on February 18, 2013
  44. 180g/l

    I want to make up a 180g/l solution acid using 98% Sulphuric Acid. How much H2SO4 do I use should I make a stock solution first.

    asked by Jillian on September 22, 2014
  45. pharmacy math

    Rx Potassium 2:5 Chloride solution 30ml. How many milliliters of a potassium chloride 3:5 solution do you need to prepare the order?

    asked by Anonymous on March 3, 2014
  46. Chemistry

    How do we prepare 500mL of 0.5 percent w/v solution of NaOH if we have stock solution of 50 percent w/v NaOH on hand?

    asked by Stacy on October 12, 2012
  47. chemistry

    you must prepare 300 mL of .750M NaBr solution using 2M NaBr stock solustion. how many mL of stock solution should you use?

    asked by abby on March 17, 2011
  48. Algebra

    how much pure acid must be added to 15 ounces of an acid solution which is 40% acid in order to produce a solution which is 50% acid?

    asked by Anonymous on January 12, 2014
  49. math

    A salt solution of 15 litres contains 20%salt. How much water must you add to salt solution, in order to dilute it 15% salt?

    asked by HEMENDU KUMAR on December 19, 2016
  50. Chemistry

    how would you prepare 250 mL of 0.69M Al2(SO4)3 solution from a 2.0M Al2(SO4)3 stock solution?

    asked by Cass on July 30, 2014
  51. chemistry

    In a .25 M solution, a weak acid is 3.0% dissociated. A. calculate the pH of the solution B. calculate the Ka of the acid Please explain steps.

    asked by anonymous on March 19, 2012
  52. chemistry

    Calculate the molarity of each. a. 1.50 mole of NaCl in 8.00 L of solution 0.188 M NaCl b. 270 mg of NaCl in 3.00 mL of solution 90 M NaCl

    asked by krystal on February 22, 2012
  53. Chemistry

    how would you prepare 250 ml of 0.69m al2(so4)3 solution from a 2.0 al2(so4)3 stock solution

    asked by Sam on July 29, 2014
  54. Grade 12 Chemistry

    Determine the concentration of a calcium chloride solution if 1.75 L of the solution contains 0.125 mol of calcium chloride.

    asked by Rachel on March 22, 2011
  55. Science

    calculate the mass of sodium nitrate in grams in a 150 ml solution of a 5.00 M solution of sodium nitrate

    asked by Stephanie on April 19, 2011
  56. chemistry

    How many liters of water must be added to 4 liters of a 6 molar HNO3 solution to create a solution that is 2 molar?

    asked by Hiba on September 14, 2010
  57. Pharmacy Math

    How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution? ____

    asked by Jean on July 30, 2012
  58. Chemistry

    If a basic solution has a pH of 11.88, is it considered to be a strong base? Is an acidic solution with a pH of 4.44 considered to be a strong acid?

    asked by Jessica on December 10, 2015
  59. Math

    Write the equations described below. a) an addition equation with one variable that has a solution of 3 b) a subtraction equation with one variable that has a solution of 2/3

    asked by Bryn on February 6, 2018
  60. Pharmacy Math

    How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution? ____

    asked by Betty on July 30, 2012
  61. chemistry

    how many milliliters of .400M hydrogen Monobromide solution can be made from 50mL of 8M hydrogen monobromide solution?

    asked by sandraaa on April 8, 2014
  62. Chemistry

    A sulfuric acid solution that is 65.0% H2SO4 by mass has a density of 1.55 g/mL at 20°C. What is the mass of h2so4 per liter of solution?

    asked by Veronica on May 31, 2014
  63. DON VASCO PATNA

    A salt solution of 15 litres contains 20% salt.How much water must you add to salt solution in order to dilute it 15% salt?

    asked by YATHART on November 21, 2014
  64. chem

    How do you prepare a solution of 12 M HCl and want to prepare 500 mL of a 0.4 M solution. Assume you have a 500-mL volumetric flask

    asked by maggie on October 16, 2012
  65. chemistry

    I fyou had only 12g of KOH remaining in a bottle, how many ml of 12.8%(w/v) solution could you prepare? (in mL) How many ml of 0.29 M solution could you prepare using 12 g of KOH?

    asked by nicole on November 21, 2010
  66. College Algebra

    How much water must be evaporated from 32 ounces of a 7% salt solution to make a 8% salt​ solution? (Answer is in ounces)

    asked by Ana on August 27, 2017
  67. pharmacy math

    RX Potassium Chloride 3:5 solution 30ml. how many millimeters of a potassium chloride 2:5 solution do you need to prepare the order?

    asked by cleondra on August 12, 2012
  68. Chemistry

    a stock solution of perchloric acid is 75.5% perchloric acid and has a density of 1.67g/ml. What is the molarity of the solution?

    asked by Michelle on November 23, 2012
  69. math

    how many liters of distilled water must be added to 80 liters of 60% acid solution to obtain a 50 % acid solution?

    asked by pau on August 29, 2015
  70. Biology

    You need to prepare 270ml of a 20% sucrose solution (w/v). Sucrose has a molecular formula of C12H22O11. How would you prepare this solution?

    asked by Anonymous on January 19, 2015
  71. math calc 2

    a cattle trough has a trapezoidal cross section with a height of 1 m and horizontal sides of width 1/2 m and 1 m assume the length of the trough is 10 m. A. how much work is required to pump out the water in the trough? B. if the length is doubled does the

    asked by arnulfo on October 25, 2012
  72. math calc 2

    a cattle trough has a trapezoidal cross section with a height of 1 m and horizontal sides of width 1/2 m and 1 m assume the length of the trough is 10 m. A. how much work is required to pump out the water in the trough? B. if the length is doubled does the

    asked by arnulfo on October 26, 2012
  73. Integration

    a cattle trough has a trapezoidal cross section with a height of 1 m and horizontal sides of width 1/2 m and 1 m assume the length of the trough is 10 m. A. how much work is required to pump out the water in the trough? B. if the length is doubled does the

    asked by Anonymous on December 21, 2014
  74. Algebra

    A motorcycle breaks down and the rider has to walk the rest of the way to work. The motorcycle was being driven at 45mi/hr and the rider walks at a speed of 6mi/hr. Teh distance from home to work is 25 miles and the total time for the trip was 2 hours. How

    asked by kaitlyn on November 11, 2012
  75. 8th grade Algebra

    I'm trying to help my young friend -- and am totally lost. He has a math crossword puzzle and here are three words we cannot find. 11. The number of solutions of a system in which the lines are parallel 11 letters, probably beginning with N 14. A line used

    asked by Ms. Sue on April 17, 2009
  76. Physics

    Determine the amount of work required for each of the following: a) to lower a 35kg sack of rice through a height of 3.5m b) to carry the 30kg sack of rice 10m along a corridor c)to crave the sack of rice 15m along the corridor at a constant velocity

    asked by Amy on March 28, 2017
  77. chemistry

    20 mL of 0.125 M potassium iodide solution is mixed with 10 mL of 0.1 g L–1 sodium thiosulfate solution and 0.2 g of solid iodine indicator is added. To this solution is added 20 mL of 0.025 M peroxodisulfate solution. After 46 seconds a blue colour

    asked by dan on May 9, 2014
  78. physics

    Machines A, B, and C do the same amount of work, but they each take a different amount of time. Machine A takes more time as compared to machine C. Machine B takes the maximum time to do the same amount of work. Which machine expends the most power doing

    asked by al on May 21, 2017
  79. Math

    You work at a grocery store. You hourly rate is greater after 6:00p.m. than it is during the day. One week you work 20 daytime hours and 20 evening hours and earn $280. Another week you work 30 daytime hours and 12 evening hours and earn a total of $276.

    asked by Lynn on November 14, 2011
  80. physics

    A weightlifter has a basal metabolic rate of 80.0 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450-Calorie bagel if he stays in bed all day? (b) How long does it take him if he’s

    asked by Marcus on November 28, 2012
  81. Career Studies

    Hi, I have to do a visual presentation on a current economic or social trend. I'm not allowed to use bristol board/posters or powerpoint/slideshows, because she wants us to be creative. What are some trends I could choose from, and what kind of

    asked by Emma on June 14, 2010
  82. Computers(Java Programming)

    Service Class: Lottery Write a Lottery class that simulates a lottery. The class should define an array of five integers named lotteryNumbers. The constructor should use the Random class (see the Java API) to generate a random number in the range of 0 to

    asked by Elaine on September 8, 2009
  83. com 200

    Kyle has struggled to feel comfortable in science classes with labs since his junior year of high school, when a solution he was working with ignited. He was always cautious with chemicals but his lab partner that year enjoyed seeing what would happen when

    asked by elizabeth on June 15, 2014
  84. Math

    Can u pls pls pls solve this algebraic expression?? I cant solve it although I tried many possible ways and solutions :/ 10+1/3[4k-(18+7k)]

    asked by Sally on July 31, 2011
  85. MATHS

    i need a lil help with this If x=2 is a root of the equation 6x^3 - px^2 - 14x + 24=0, find p,hence, solve the equation 6*(2)3-p*(2)2-14*2+24=0 6*8-p*4-14*2+24=0 48-4p-28+24=0 Can take it from here? yes..i got p to be 11. I do not know what else to do from

    asked by Kim on December 9, 2006
  86. Chemistry

    An iron nail with a mass of 0.750 g was dissolved in dilute sulfuric acid and diluted to 100.0 mL volume. A 10.0 mL aliquot of this solution was then titrated with standard 0.200 M potassium permanganate solution, according to the following equation: MnO4-

    asked by Marina on January 3, 2016
  87. world civilization

    why were river valleys vital to the development of civilization why were river valleys vital to the development of civilization It is diffiult to farm on the hilltops or sides of hills. Valley are where the water is, the soil is, and the moderate

    asked by zeid on October 10, 2006
  88. Calculus

    If any body can solve this I would be greatly appreciative. I spent an hour in the tutoring center and no one could solve. Here goes: A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a

    asked by Linda on October 5, 2011
  89. Algebra

    Rod is a pilot for Crossland Airways. He computes his flight time against a headwind for a trip of 2900 miles at 5 hr. The flight would take 4 hr and 50 min if the headwind were half as great. Find the headwind and the plane’s air speed. Please help me

    asked by Julissa on November 22, 2008
  90. triggggg help

    Let cos 67.5° = [√(2(+√2)]/2, find tan 67.5°. Show work and simplify. I'm not too sure if i'm doing this correct. I know that the given is cos 67.5° = [√(2(+√2)]/2 sin^2 x + cos^2 x = 1 x=67.5° sin^2 67.5° + cos^2 67.5° = 1 sin^2 67.5° = 1 -

    asked by Jane on January 28, 2016
  91. Chemistry

    Question: you have a clear, colorless aqueous sample in a beaker that contains either CO2^-2(aq) or C^-1(aq) or a mixture of both ions. the following aqueous reagents are available: NaCl, HNO3, and AgNO3. describe a procedure that will allow the

    asked by Anonymous on May 12, 2009
  92. Chemistry

    carbon dioxide (CO2) is the gas mainly responsible for global warming (the greenhouse effect). the burning of fossil fuels is a major cause of the increased concentration of CO2 in the atmosphere. carbon dioxide is also the end product of metabolism. a

    asked by Lauren on June 13, 2011
  93. science

    About a month ago I asked you a question and it was, A quantity of gas has a volume of 0.20 cubic meter and an absolute temperature of 333 degrees Kelvin. When the temperature of the gas is raised to 533 degrees Kelvin, what is the new volume of the gas?

    asked by Mirayah Robinson on August 17, 2005
  94. western michigan university

    A 30 gram metal at 100 degrees Celsius was dropped into 132 grams of water at 25 degrees Celsius and the final temperature for the metal in water system was 29 degrees Celsius. Calculate the specific heat capacity of the metal if the specific heat capacity

    asked by lorena on December 6, 2012
  95. Chemistry

    in this experiment you are you will begin by preparing a dilute soultion of sodium hydroxide by taking 50 ml of 3 M NaOh stock solution and diluting it with 250 ml of water. i found that and the answer was .5 but how do i do this b. calculate the number of

    asked by Chris on February 23, 2010
  96. Physical Chemistry

    Determine the temperature change when 18.0 g of the following salt is dissolved in 190. g of water. The specific heat capacity of water is 4.184 J·K-1g-1. The enthalpies of solution in the table are applicable. Do not take the added mass of the salt into

    asked by Trixie on February 10, 2010
  97. chemistry

    Show the calculation of (1) the expected grams of aspirin (C9H8O4) formed in the reaction of 2.7 grams of salicylic acid (C7H6O3) with excess acetic anhydride and then show the calculation of (2) the % yield if the actual yield of aspirin is 1.44 grams.

    asked by emily on March 12, 2015
  98. math

    A tangent line is drawn to the hyerbola xy=c at a point P. 1) show that the midpoint of the line segment cut from the tangent line by the coordinate axes is P. 2) show that the triangle formed by the tangent line and the coordinate axes always has the same

    asked by justin on October 16, 2007
  99. Organic Chemistry

    A half-life of a H2O2 solution at a certain condition is 4 weeks. You have a 100 mL of 1.00M H2O2 solution. How many moles of H2O2 will be left in the solution after the following weeks? 04 weeks after: moles 08 weeks after: moles 16 weeks after: moles 20

    asked by Ashley on July 1, 2012
  100. Chemistry

    A half-life of a H2O2 solution at a certain condition is 4 weeks. You have a 100 mL of 1.00M H2O2 solution. How many moles of H2O2 will be left in the solution after the following weeks? 04 weeks after: moles 08 weeks after: moles 16 weeks after: moles 20

    asked by Ashley on July 1, 2012

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