1. Chemistry

    10.6gram of hydrated zinc tetraoxosulphate (vi) on heating to constant mass gave 5.95g of the anhydrous form.Calculate the number of molecules(x) of water of crystalization in the hydrated salt.(zn=65,s=32,o=16,h=1)

    asked by Ashlyn on May 6, 2015
  2. fluid mechanics

    A dam has been constructed of a large cylindrical pipe 10ft in diameter and 3ft long. Calculate the net vertical and horizontal components of the fluid(water) force on this dam.

    asked by Kim on March 22, 2015
  3. chemistry

    Moles chemistry? Calculate the mass of solute required to prepare ib the solution 200cm^3 of solution containig 0.50 mol dm ^-3 cl-iond prepared by dissolving cacl2.6h2o in water.

    asked by joanna on December 8, 2016
  4. chemistry

    From the following information, calculate the standard change of enthalpy for the combustion of coal. C + O2 -> CO2 COMPOUND HEAT OF FORMATION coal 0.0 carbon dioxide -393.5 water (l) -285.9 oxygen 0.0

    asked by Annabelle on July 15, 2012
  5. college-chemistry

    calculate the ph of a buffer solution prepared by adding 0.397 mole of the sodium salt of a weak organic acid HA to 0.474 L of 1.023m acid HA with pka=4.82 and diluting to 1.00 L WITH WATER

    asked by Meenakshi on September 18, 2012
  6. Chemistry

    A certain amount of calcium reacts with water and the formed hydroxide 49g completely neutralized phosphoric acid. Calculate the volume of hydrogen obtained, at STP, and the mass of calcium.

    asked by Jessica on January 22, 2016
  7. MATH

    Aiden uses 1/4 of the water in a bucket to water 1 plotted plant.How many plotted plants can Aiden water with 3 full buckets of water?

    asked by - on January 6, 2018
  8. Algebra

    A water tank holds 500 gallons of water. The water is used at a rate of 12 gallons per hour. How much water is in the tank after 11 hours.

    asked by Nelle on November 20, 2016
  9. math

    A supersoaker water pistol can hold up to 4 litres of water. If each shot uses 11/12 of amount of water of its previous shot, the amount of water fired by a fully loaded supersoaker's first shot is? x/4000ml=11/12 x=3666.7mL why is the answer 333mL?

    asked by cyn on January 9, 2010
  10. chemistry

    When ice at 0C melts to liquid water at 0C, it absorbs 0.334 kj of heat per gram. Suppose the heat needed to melt 31.5 g of ice is absorbed from the water contained in a glass. If this water has a mass of .210 kg and a temperature of 21.0C, what is the

    asked by Capacino on June 24, 2009
  11. math

    how many cubic inches in 7'8"L, 12'2"W, 10'1" tall? please show how you get to the answer. I added up the feet (7+12+10=29 ft) and multiplied by 12 inches (29x12=348 in), then added on the remaining inches (8+2+1=11, 348+11) to come up with an answer of

    asked by Matt on November 16, 2014
  12. 10th grade

    An unsaturated solution is made by completely dissolving 20.0 grams of NaNO3 in 100.0 grams of water at 20.0°C. (the gram formula mass=85.0 grams per mole) Determine the minimum mass of NaNO3 that must be added to this unsaturated solution to make a

    asked by R on December 25, 2009
  13. chemistry

    what are some source errors in my experiment? determine absolute zero. We attached a capillary to a ruler with a thermometer. placed it in water and heated. I recorded and my partner did the readings. source errors: -partner didn't stir the water before he

    asked by dan on June 21, 2009
  14. Chemistry!!

    A chemist wants to prepare a stock solution of H2SO4 so that a sample of 20.00mL will produce a solution with a concentration of .50 M when added to 100.0mL of water. A)what should the molarity of the stock solution be? B)If the chemist wants to prepare

    asked by Anonymous on April 22, 2013
  15. Chemistry

    A mixture contains only NaCl and Al2(SO4)3. A 1.45-g sample of the mixture is dissolved in water and an excess of NaOH is added, producing a precipitate of Al(OH)3. The precipitate is filtered, dried, and weighed. The mass of the precipitate is 0.107 g.

    asked by Melissa on September 18, 2010
  16. chemisty

    A mixture contains only NaCl and Al2(SO4)3. A 1.76-g sample of the mixture is dissolved in water, and an excess of NaOH is added, producing a precipitate of Al(OH)3. The precipitate is filtered, dried, and weighed. The mass of the precipitate is 0.126 g.

    asked by hope on February 5, 2011
  17. chemisty

    A mixture contains only NaCl and Al2(SO4)3. A 1.76-g sample of the mixture is dissolved in water, and an excess of NaOH is added, producing a precipitate of Al(OH)3. The precipitate is filtered, dried, and weighed. The mass of the precipitate is 0.126 g.

    asked by hope on February 5, 2011
  18. Chemistry

    1. Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.240 M pyridine, C5H5N(aq) with 0.240 M HBr(aq): (a) before addition of any HBr (b) after addition of 12.5 mL of HBr (c) after addition of 22.0 mL of HBr (d) after addition

    asked by Mia on February 20, 2014
  19. math

    A water treatment plan is built with three cylindrical tanks to contain the water for a town. Each tank has a radius of 15 feet and a depth of 25 fee. If there are about 7.5 gallons in a cubic foot of water, approximately how many gallons of water can be

    asked by lucy on February 10, 2009
  20. Chemistry pls clearly step step for me

    2gm of mixture hydrated sodium carbonate and sodium bicarbonate was dissolved in water and made up to 250cc. 25cc of this solution was titrated using methyl orange as indicator and 22.5cc of 0.087N hcl were required for naturalization. calculate the

    asked by ken on June 21, 2014
  21. Chemistry

    1. How much heat is added to 40.0 g of ice at –20 o C to convert it to steam at 120 oC? 2. How much heat is added to 25.0 g of ice at –25 o C to convert it to steam at 120 oC? 3. How much heat is added to 10.0 g of ice at –20 o C to convert it to

    asked by Briana on January 2, 2013
  22. thermochemistry

    . Mountain climbers often brew tea by melting snow, which they heats over a stove. Our stove burns butane (C4H10), which has a heat of combustion of -2878 kJ/mol. The temperature of the snow is initially at -20 °C, and we need 80 °C water to brew tea. a.

    asked by David on April 9, 2017
  23. science

    3 moles of pesticide of molecular mass 200 g/mole is applied to a closed system consisting of 20 m3 of water, 10 m3 of air, 1 m3 of sediment, and 0.001 m3 of fish. Determine the concentration and amount in both grams and mole units in air, water, sediment

    asked by gift on March 27, 2014
  24. math

    Water is flowing at a rate of 10 m3/s into the cylindrical tank shown below. a) Find the volume V of the water as a function of the water level h. b) Find h as a function of the time t during which water has been flowing into the tank. height of cylinder:

    asked by lou on July 18, 2011
  25. chemistry

    A solution is prepared by mixing 5.00 grams of compound Z (molar mass 15.00 g/mol) in 100.0 ml of water. The density of the solution is 1.09 g/ml. Calculate the molarity of the solution

    asked by Angela on January 27, 2011
  26. Science

    If you swung a bucket of water quickly in an upside down circular path, the water would not fall out of the bucket. Which of the following best describes why this happens? a. Due to centripetal force, the water is pushing on the bottom of the bucket.*****

    asked by Anonymous on February 7, 2018
  27. physics

    An aluminum plate of mass 0.1 kg at 95oC is immersed in 0.5 litre of water at 20oC kept inside an insulating container and is then removed. If the temperature of the water is found to be 23oC, then the temperature of the aluminum plate is ___________ oC.

    asked by Rohan on June 2, 2016
  28. Chemistry

    In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 58.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 C when the reverse

    asked by Tracy on February 18, 2012
  29. physics As

    Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge A piece of fuse wire has a diameter of

    asked by cylinder on December 14, 2017
  30. As physics

    Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge A piece of fuse wire has a diameter of

    asked by cylinder on December 12, 2017
  31. Physics I NEED HELP WITH EQUATIONS

    A 7kg block is pulled at a constant velocity by a horizontal 25 N force - Calculate normal & gravitational forces - Calculate the applied & frictional forces - Calculate the coefficient of friction CAN SOMEONE PLEASE HELP ME WITH THE EQUATIONS FOR ALL OF

    asked by Jamika on June 3, 2014
  32. math

    n added to a number equals 14. A number added to 14 equals 114. What does the variable y represent? And what number plus 14 equals 114? I keep coming up with n = 0 and x = 100 I think we are all trying to understand what your problem really says. Where

    asked by geo on April 11, 2007
  33. Chem

    Am I doing this right? Find the concentration of the phosphate ion. 1.00 mL 210 micro molar. DI water added to 25 ml line. 1.00 mL phosphate solution * 1L/1000mL * 210 mol phosphate solution/1L solution * 1.0 *10^-6 mol/ 1 micromol * 1 mol PO4 3- / 1 mol

    asked by Allie on March 8, 2018
  34. Chemistry

    A 110.-g sample of copper (specific heat capacity = 0.20 J/°C · g) is heated to 82.4°C and then placed in a container of water at 22.3°C. The final temperature of the water and copper is 23.5°C. What is the mass of the water in the container, assuming

    asked by Brittney on July 11, 2011
  35. Chemistry

    Select the statements that correctly describe buffers.? 1) The pH of a buffer solution does not change significantly when any amount of a strong acid is added. 2) The Ka of a buffer does not change when any amount of an acid is added to the buffer

    asked by Aria on September 23, 2013
  36. Chemistry

    When atmospheric pressure is 700. mmHg, water boils at 97.714 degrees C. Calculate entropy change of water if 50.0 grams is vaporized under these conditions. The heat of vaporization of water can be found in almost any reference text, and Cp H2O= 33.6

    asked by Chris on March 7, 2007
  37. REALLY HARD CALCULUS PROBLEMMMM PLEASE HELP ME???

    A circular swimming pool has a diameter of 16 m, the sides are 3 m high, and the depth of the water is 2.5 m. How much work (in Joules) is required to pump all of the water over the side? (The acceleration due to gravity is 9.8 m/s 2 and the density of

    asked by Sarah with an 'H' on October 15, 2014
  38. physics

    A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.30 m/s and her body makes an angle of 83.0° with respect to the horizontal surface of the water. Determine her initial velocity,

    asked by help on February 7, 2011
  39. Chemistry

    Sally Scientist is trying to determine Avogadro's number using a procedure analogous to that in Experiment 4. She fills a watchglass with diameter 11.9 cm with water and is trying to create a monolayer of stearic acid on the top of the water. What is the

    asked by Mindy on February 7, 2010
  40. Physics- Algebra based

    A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.10 m/s and her body makes an angle of 80.0° with respect to the horizontal surface of the water. Determine her initial velocity,

    asked by Bailey on February 5, 2011
  41. physics

    A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.00 m/s and her body makes an angle of 71.0° with respect to the horizontal surface of the water. Determine her initial velocity,

    asked by tom on November 3, 2010
  42. physics

    A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.10 m/s and her body makes an angle of 77.0° with respect to the horizontal surface of the water. Determine her initial velocity,

    asked by james on February 7, 2010
  43. Physics

    A diver springs upward from a board that is 3.00 m above the water. At the instant she contacts the water her speed is 8.90 m/s and her body makes an angle of 75.0 degrees with respect to the horizontal surface of the water. Determine her initial velocity

    asked by Anonymous on September 23, 2010
  44. physics

    Objects A and B have the same mass of 3.4 kg and are at their melting points. They melt when 4.9 × 104 J of heat is added to A and when 11 × 104 J is added to B. (a), (b) Determine the latent heat of fusion for the substance from which each object is

    asked by Anonymous on April 24, 2013
  45. Math

    A jug has 400 mL of 1/2 strength orange juice. The following amounts of full-strength juice are added to the mix. Find a fraction to describe the strength of the orange drink after the full-strength juice is added a) 100 mL I don't get what this question

    asked by Anonymous on February 6, 2017
  46. chemistry

    . Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 moles ratio. What volume of compound D is to be added? ***Dr

    asked by Bob on December 11, 2011
  47. Chemistry

    When doing a simple distillation of ethanol-water, is the vapor pure ethanol or does it also contain water? (knowing that ethanol has lower boiling point than water) If it is not pure ethanol, why is it not possible to separate water & ethanol completely?

    asked by Namie on January 4, 2012
  48. College Chemistry

    1. From data below, calculate the total heat (in J) associated with the conversion of 0.514 mol ethanol gas (C2H6O) at 451°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. (Pay attention to the sign of the heat.) Boiling point at 1 atm 78.5°C cgas

    asked by Arian on January 23, 2011
  49. College Chemistry

    1. From data below, calculate the total heat (in J) associated with the conversion of 0.514 mol ethanol gas (C2H6O) at 451°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. (Pay attention to the sign of the heat.) Boiling point at 1 atm 78.5°C cgas

    asked by Arian on January 22, 2011
  50. College Chemistry

    1. From data below, calculate the total heat (in J) associated with the conversion of 0.514 mol ethanol gas (C2H6O) at 451°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. (Pay attention to the sign of the heat.) Boiling point at 1 atm 78.5°C cgas

    asked by Arian on January 22, 2011
  51. english FIXED

    original thread: cgi?id=1330376726 1. Water is the source of life. We all depend on it. Water is important, and we cannot survive a week without it. 2. Water should be free; it is a basic need for living. We should not consider buying bottled water. 3.

    asked by ESLstudent on February 27, 2012
  52. Chemistry

    When a diprotic acid, H2A, is titrated by NaOH, the protons on the diprotic acid are generally removed one at a time, resulting in a pH curve that has the following generic shape. (a) Notice that the plot has essentially two titration curves. If the first

    asked by Franklin on March 7, 2013
  53. physics

    Consider N atoms con¯ned on a surface of area A at temperature T . The atoms form a two-dimensional (2D) gas of classical, noninteracting particles. (a) Calculate the partition function for the system. (b) Calculate the Helmholtz free energy, F , of the

    asked by esmat on June 13, 2011
  54. chemisry

    What are the specializations of sanitary engineering? Drinking water supply Sewage Wastewater treatment 2) Name the different parts of the drinking water supply system? Production Storage Distribution 3) Which of the following three systems can be

    asked by Anonymous on September 24, 2013
  55. chemistry

    Electrolysis of water produces hydrogen gas and oxygen gas, which can be collected over water: 2H2O(l) → 2H2(g) + O2(g) An electrolysis reaction at 735 mmHg pressure produced 25.00L of gas at 25°C; at which point, the vapor pressure of water is 23.76

    asked by Lay on October 13, 2015
  56. Math

    A marine biologist is testing a new under water probe. The probe is catapulted from the ship into the air, descends under water to a predetermined depth, and then returns to the surface where it can be collected. The function that models the probe’s path

    asked by Ryan on October 30, 2014
  57. Chemistry

    If the thermometer reads 22 c and this corresponds to 19.8mmhg of water pressure , what is the pressure of a pure gas collected over water if the total pressure is 760 mmhg?next calculate the pressure of the gas and lets assume its hydrogen gas in atm.

    asked by Flor on March 25, 2017
  58. math

    you are responsible for buying supplies for an upcoming camping trip. you can buy packages of stew that just need water added and then are heated. Each package costs $4.95 and contains enough stew for 2 people. You need to buy enough packages so that you

    asked by Taylor on September 9, 2013
  59. math

    you are responsible for buying supplies for an upcoming camping trip. you can buy packages of stew that just need water added and then are heated. Each package costs $4.95 and contains enough stew for 2 people. You need to buy enough packages so that you

    asked by Taylor on September 9, 2013
  60. physics

    a) 2.0 kg of molten copper at its melting point of 1083 ºC (the copper is 100% liquid) is poured into a mold in a cooling water bath at 20 ºC. What mass of water is needed to bring the solidified copper and water to an equilibrium temperature of 30 ºC,

    asked by Eric on December 12, 2006
  61. chemistry

    2. Bromine can be added to limonene to create a brominated compound. The balanced equation is shown below. When 613 mg of limonene and 3.5 mL of a 10% (v/v) solution of Br2 in dichloromethane (a solvent) are combined, 959 mg of the product is isolated.

    asked by Grace on February 23, 2010
  62. physics

    Water is leaking out of an inverted conical tank at a rate of 10700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 7.0 meters and the diameter at the top is 4.0 meters. If the

    asked by emily on December 10, 2015
  63. Chem

    In the previous experiment, you recrystallized salicylic acid. If you were askedto take melting point of your crystals, would it be necessary to dry the salicylicacid crystals thoroughly first? What result would you expect from your melting point

    asked by Jason on October 13, 2008
  64. College Chemisty

    The pH of water collected in a stormwater run-off downstream from a Union Carbide chemical factory is 4.82. Calculate the H+ ion concentration of rainwater. The problem may start with: pH= -log H+ = 4.82. The answer is 1.5x10 power -5. Again, Can you

    asked by Elleni on October 22, 2010
  65. Chemistry

    Please help me with these questions: 1. Consider the equation:2Na+ 2H2O-->2NaOH +H2 -If 92.0g of sodium is reacted with 76.0g of water until the reaction goes to completion, which reactant will remain and in what quantity? A: I know that H20 is the

    asked by Sally on January 27, 2011
  66. Scince

    am having trouble with Restate the problem in terms of the following: Manipulated variable Constant (control) variables Principles of experimental design State in correct form the hypothesis you intend to demonstrate. I have conducted the experiment but I

    asked by pookie on December 16, 2008
  67. Chemistry

    1000 g of 55%(mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution. How many liters of water should be added to the starting solution?

    asked by Wube on May 2, 2012
  68. science chemistry

    1000g of a 55%(mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution.how many liters of water should be added to the starting solution?

    asked by Muhammad on November 5, 2012
  69. science chemistry

    1000g of a 55%(mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution.how many liters of water should be added to the starting solution?

    asked by Muhammad on November 5, 2012
  70. Chemistry

    Calculate the molar solubilty of CaC2O4 in a solution that has been buffered to a pH of 4.00 Remember to account for reactions involving H2C2O4 acting as an acid in water. To account for the buffer, simply assume that H+ = 1.00X 10^-4

    asked by Matt on October 30, 2007
  71. !chemistry !experiment!

    Design an experiment which is not a tritation, you could use to calculate the percentage of water of crystalallization in NA2CO3.xH20. Need apparatus, detailed method including precutions and assumptions, how the results are recorded and how the percentage

    asked by Cameron on June 1, 2010
  72. Chemistry

    Assuming that seawater has a total ion concentration (aka colligative molarity) of 1.10 M conc, calculate how many liters of seawater are needed to produce 68.7 L of fresh water at 20 C with an applied pressure of 51.0 bar.

    asked by Michael Stoll on January 11, 2014
  73. Science

    Chemistry Enthalpy Calculations? Given the equation: CaO + H2O ----> Ca(OH)2 A 1 g sample of CaO is dissolved in 100 ml water with density 1.00g/ml. The temperature rise is 3.7 degrees C. The specific heat is 4.00 J/g*deg. 1. Calculate the heat (in J)

    asked by Pablo on October 18, 2012
  74. Chemistry(Please check, thank you)

    For an experiment on the effect of a buffer solution, I need to calculate the expected pH of the buffer. I know that I have to make an amounts table and use the Hasselbalch equation to find the pH. For the first part, 0.10M HCl was added to a buffer. The

    asked by Hannah on March 29, 2012
  75. Algebra 2

    Damon thank you for the previous help. A geyser sends a blast of boiling water high into the air. During the eruption, the height (h) (in feet) of the water (t)seconds after being forced out from the ground could be modeled by h = -16t*t + 70t. The last

    asked by Adam on March 12, 2008
  76. Physics

    A body of volume hundred centimetre cube is immersed completely in water contained in a jar containing water. the weight of the jar and the water before immersion was 700 grams. After immersion weight of the jar and the water will be

    asked by Vidhi on July 27, 2016
  77. physics

    (a) Assuming that each cubic centimeter of water has a mass of exactly 1 g, find the mass of 3.76 cubic meter of water in kg. (b) Suppose that it takes 10.4 hours to drain a container of 59.1 m^3 of water. What is the “mass flow rate,” in kg/s, of

    asked by sagara on January 26, 2011
  78. science

    a u-tube is partially filled with water.oil which does not mix with water is next poured into one side until water rises by 2.5cm on the other side.if the density of oil be 0.8 ,the oil level will stand higher than the water level by how much?

    asked by abuobaida johar on May 17, 2012
  79. chemistry -3.2.4

    Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D.

    asked by erika on September 15, 2016
  80. chemistry

    Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D.

    asked by erika on September 15, 2016
  81. Chemistry

    Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D.

    asked by Laura on September 18, 2016
  82. Ap Biology

    In the case of water, solid water is less dense then liquid water. What is happening at the molecular level? a. Molecules move faster in ice than water. b. Hydrogen bonds break more easily in ice. c. Hydrogen bonds break more easily in water. d. Molecules

    asked by Carol on May 23, 2017
  83. physics

    The amount of heat Q needed to turn a mass m of room temperature T_1 water into steam at 100degrees C T_2 can be found using the specific heat c of water and the heat of vaporization H_v of water at 1 atmosphere of pressure. Suppose that a commercial

    asked by Anonymous on November 27, 2008
  84. Chemistry

    Experiment 1 results: mass of crucible 88g mass of hydrate 93g mass of salt 91.196g 1. Calculate the following: a:mass of water in the hydrate sample (g) b:number of moles of water in the sample c:mass of pure salt in the sample (g) d:number of moles of

    asked by Leanna on March 7, 2015
  85. Chemistry

    O.k. I am confused. So here is what I did. Mass of empty flask plus stopper: 37.34g mass of stoppered flask plus water: 63.67g Mass of stoppered flask plus liquid: 52.01g Mass of water: 63.67 - 37.34= 26.33 Volume of Flask(density of H20 at 25*C, 0.9970

    asked by Sara on August 22, 2007
  86. Chemistry

    Experiment Na2C2O4 is added to Pb(NO3)2.Precipitate forms (I think its PbC2O4). After the liquid above was decanted to another container. Dilute HNO3(aq) was added to it. The decanted cloudy solution cleared up a little but it was kinda cloudy still. Im

    asked by Andy on April 1, 2012
  87. Math

    A juice concentrate containing 65% solids is added to a single-strength juice solution(containing 15% solid), in order to generate a final product which contains 45% solids. Calculate the amounts required for the concentrate and for the single strength

    asked by Janice on February 7, 2012
  88. Chemistry

    Is the following a physical or chemical separations: salt water --> water+ sodium chloride Do you change the composition of the water? Do you change the composition of the salt. I can't say which because you don't tell me how you separated them. For

    asked by George on September 9, 2006
  89. Math

    The school is having a big event in the gym and wants to use their rectangular tables. 6 people can sit together at one rectangular table. If 2 tables are placed together, 10 people can sit together. So the pattern I noticed is 4 people added whenever a

    asked by John Dosley on July 27, 2016
  90. chemistry

    What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O? 2. A solution is made by adding 1.23 moles of KCl to 1000.0 g of water. What is the % by mass of KCl in this solution? 3. If you have 100.0 mL of a 25% aqueous solution of ethanol, what

    asked by Anonymous on February 10, 2011
  91. chemistry

    What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O? 2. A solution is made by adding 1.23 moles of KCl to 1000.0 g of water. What is the % by mass of KCl in this solution? 3. If you have 100.0 mL of a 25% aqueous solution of ethanol, what

    asked by Anonymous on February 10, 2011
  92. CHEMSTRY

    . A small amount of solid Hg2Cl2 and 25 ml of metallic mercury were added to a solution of 5.03 x 10-2 M NaCl. A platinum electrode immersed in the layer of mercury was connected to a reference half-cell whose electrode potential was 0.222V. The voltage of

    asked by ABDULALEH on November 22, 2008
  93. AP CHEM

    Kc = 1.87 10-3 for the following reaction. PH3BCl3(s)=>PH3(g) + BCl3(g) (a) Calculate the equilibrium concentrations of PH3 and BCl3 if a solid sample of PH3BCl3 is placed in a closed vessel and decomposes until equilibrium is reached. (b) If the flask has

    asked by Ashley on February 7, 2009
  94. chem 101

    Concentrated sulfuric acid is 18.0 M. If you are asked to make a 1L solution of 6M sulfuric acid. How much water (L) and how much acid (L) should be added to make this solution?

    asked by gale on November 23, 2015
  95. Chemistry

    Mass of an empty flask and stopper is 55.844g. 5mL of an unknown liquid is added and heated in a water bath at 99.7 degrees C. It then cools down. The stopper is removed and then replaced. The weight of all of this is 56.101g. The volume of the flask is

    asked by Gg on October 21, 2014
  96. calculus

    A water-trough is 10m long and has a cross-section which is the shape of an isosceles trapezoid that is 30cm wide at the bottom, 80cm wide at the top, and has height 50cm. If the trough is being fi lled with water at the rate of 0.2 m3/min, how fast is the

    asked by asdf on December 1, 2012
  97. math

    Water is leaking out of an inverted conical tank at a rate of 11400 cm^3/min at the same time that water is being pumped into the tank at a constant rate. The tank has height 8.0m and the the diameter at the top is 3.5m. If the water level is rising at a

    asked by shelby on March 25, 2008
  98. math

    Water is leaking out of an inverted conical tank at a rate of 10600.0 cm3/min at the same time that water is being pumped into the tank at a constant rate. The tank has height 14.0 m and the the diameter at the top is 6.0 m. If the water level is rising at

    asked by Anonymous on April 12, 2015
  99. calc rates

    Water is leaking out of an inverted conical tank at a rate of 10600.0 cm3/min at the same time that water is being pumped into the tank at a constant rate. The tank has height 14.0 m and the the diameter at the top is 6.0 m. If the water level is rising at

    asked by Anonymous on April 12, 2015
  100. Calculus 1

    Water is leaking out of an inverted conical tank at a rate of 9,500 cm^3/min at the same time that water is being pumped into the tank at a constant rate. The tank has height 6 m and the diameter at the top is 4 m. If the water level is rising at a rate of

    asked by TayB on October 8, 2015