1. physics

    You hold a hose 45 degrees to the horizontal and at a height of 1 m from the floor. The water reaches a maximum distance of 10 m from where you are standing. Now you place your thumb over the end of the hose to occlude the opening by 80%, which in turn

    asked by carolyn on April 4, 2015
  2. business

    2. Think of a risk response plan that you have in your personal life, such as automobile, homeowner’s, or renter’s insurance. What were some of the decision criteria that influenced your decision about how much coverage to purchase? How does your

    asked by barry on July 1, 2011
  3. Statistics

    Suppose an automobile association reports that the average time it takes to respond to an emergency call is 25 minutes. Assume the variable is approximately normally distributed and the standard deviation is 4.5 minutes. If 104 calls are randomly selected,

    asked by Renita on February 3, 2012
  4. creating environment for learning

    which of the following behaviors might be resolved by changing the environment? a. two children fighting over a toy fire engine. b. children wandering rather than participating in activities during center time. c. children climbing on furniture d. all of

    asked by Anonymous on June 30, 2014
  5. physics

    a rocket blasts off and moves up with an acceleration of 12 m/s2 until it reaches 30 m then the engine shuts down and the rocket continues in free fall. What is the max hieght of the rocket and what is the total duration of the rockets flight?

    asked by kristin on September 1, 2011
  6. Physics

    A rocket is fired vertically with an acceleration of 16m/s^2. After time T, the rocket's engine runs out of fuel and it begins to fall freely. The maximum height of the rocket is 940m, what is the minimum value of T?

    asked by Liam on September 30, 2016
  7. creating enviornment

    which of the following behaviors might be resolved by changing the environment? a. two children fighting over a toy fire engine. b. children wandering rather than participating in activities during center time. c. children climbing on furniture d. all of

    asked by Anonymous on June 30, 2014
  8. physics

    A 1500-kg car coast in neutral down a 2.0degrees hill. The car attains a terminal speed of 20.0 m/s. The question is:how much power must the engine deliver to drive the car on a level road at 20.0 m/s?? Help me out please!!

    asked by Anonymous on April 29, 2014
  9. math

    The path of water from a hose on a fire tugboat can be approximated by the equation y = −0.0055x2 + 1.2x + 10, where y is the height, in feet, of the water above the ocean when the water is x feet from the tugboat. When the water from the hose is 6 feet

    asked by anonymous on September 27, 2018
  10. math

    The path of water from a hose on a fire tugboat can be approximated by the equation y = −0.0055x^2 + 1.2x + 10, where y is the height, in feet, of the water above the ocean when the water is x feet from the tugboat. When the water from the hose is 6 feet

    asked by anonymous on September 27, 2018
  11. Chemistry

    A salt water swimming pool is 47.0 m long, 25.1m wide, and 2.79 m deep. If the pool is filled with salt water having a density of 1.06 g/ cm3, how many pounds of salt water are in the pool when it is filled? 1 kg = 2.20 lb I'm not sure how to approach

    asked by Jamie on August 29, 2016
  12. physics

    An insulated beaker contains 300g of water initially at 30 degree celsius. water at 100 degree celsius is added until the temperature of mixture reaches 50 degree celsius . the specific heat capacity of water is 4.2J/(kg degree celsius). how much water is

    asked by annie on May 22, 2016
  13. Chemistry

    Natural gas is almost entirely methane, CH4. What volume of natural gas at 20 C and 1.00 atm pressure is required to heat one quart of water from 20 C to 100 C? The density of methane at 20 C is 0.665 g/mL. The reaction for the combustion of methane is CH4

    asked by Anonymous on March 19, 2014
  14. chemistry

    Okay so the question is: what would be the molarity of a saturated aqueous solution of NaI prepared at 25 C, assuming that the added NaI does not add significantly to the volume of the water? My question is, I got confused on what formula I use to for the

    asked by Unknown on June 10, 2015
  15. chemistry

    A volatile liquid was allowed to evorate in a 43.298g flask that has a total volume of 252mL.the temperature of the water bath was 100 celsius at the atmospheric pressure of 776 torr.the mask of the flask and condensed vapor was 44.173g.calculate the molar

    asked by Jetta on June 28, 2010
  16. Chemistry

    In a constant-pressure calorimeter, 60.0 mL of 0.330 M Ba(OH)2 was added to 60.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 21.71 °C to 26.21 °C. If the solution has the same density and specific heat as water,

    asked by Heather on February 11, 2012
  17. physics

    An aluminum can is filled to the brim with a liquid. The can and the liquid are heated so their temperatures change by the same amount. The can’s initial volume at 5 oC is 3.5×10−4​ m3. The coefficient of volume expansion for aluminum is

    asked by Guadalupe on May 13, 2014
  18. chemistry

    When 0.320 moles of NH4Cl is dissolved in 1.00 L of water, the temperature drops by 13.7 degrees C. What is the heat of solution of ammonium chloride? The solution has a density of 1.0012 g/mL and a specific heat of 0.9818 cal/g degrees C. How do you find

    asked by anita on April 7, 2010
  19. Math

    On a site plan for a new house, a water main runs along the edge of the property straight from point W(10, 34) to point M(2, 2). The water service will enter the house at point H(24, 22). The grid intervals on the plan represent 0.5m. A) At what point on

    asked by Afreesh on January 15, 2011
  20. 6th grade math

    I'm not sure how to solve this problem using unit rate. Jonathan is baking several boxes of bread. He used 9cups of water to 12 cups of flour. How much water was used per cup of flour? Ans: 9cups water/12cups flour = 3/4 cups water --is the problem solved

    asked by Alex on October 10, 2013
  21. Cell biology

    you ask your lab assistant to prepare IL of solution Zeta at a concentration of 1M. He comes up to you with a 0.5M stock solution ans asks for help in calculating how much to use. what do you tell him? I dont think my answer is correct. I got 2000 mL of

    asked by Maria on September 5, 2018
  22. chemistry

    1. Ceramic material made by the sol-gel process involve the reaction of a. water and acids. b. ethanol and water. c. water and metal oxides. d. acids and metal alkoxides. e. water and metal alkoxides. my ans. c 2. The step in the sol-gel process that forms

    asked by 657 on December 2, 2012
  23. Math

    What graph would be the best for this problem: The following are prices (in dollars) 2004 automobiles, as listed in a sale ad in the automobile section of the newspaper: 12,997 14,891 18,666 21,799 17,495 17,266 21,517 14,414 14,257 15,634 15,734 27,825

    asked by Anonymous on November 1, 2009
  24. General chem lab

    This involves Enthalpy of Neutralization: A student determined the calorimeter constant of the calorimeter. Using a plotted line. The student added 50ml of cold water to 50 ml of heated water in a Styrofoam cup. The initial temperature of the cold water

    asked by Toni on March 24, 2007
  25. Physics Fluids

    Water is flowing through a rectangular channel that is 12 m wide with a speed of 0.75 m/s. The water then flows into four identical rectangular channels that have a width of 3.0 m. The depth of the water does not change as it flows into the four channels.

    asked by Drew on April 6, 2015
  26. Math

    Hayden had 2 1/2 gallons of water in his watering can. The seed packet said to use 1/4 of a gallon for peppers and 5/8 of a gallon for tomatoes. Hayden then used some of the water for lettuce. If Hayden had 3/4 gallons of water left over, about how much

    asked by iris on September 28, 2015
  27. Chemistry

    Heat Capacity at constant volume: CV = (partial q / partial T) with V constant since volume is constant, work is zero and dq = dU, so CV = (partial U / partial T) with V constant Delta U = CV * Delta T Does this final relationship hold during a reaction

    asked by jake on March 5, 2009
  28. 5th grade math

    Two pails of different sizes contain 34.5 liters of water altogether. When 0.68 liter of water is poured from the bigger pail into the smaller pail, the amount of water in the bigger pail is 9 times that in the smaller pail. How much water was there in

    asked by Bella on April 5, 2016
  29. chemistry

    Calculate the number of grams of reactant left over when 28.35 grams of silver reacts with 50.0 liters of air at STP which is 20.9476 % oxygen by volume. The density of air at STP is 1.292 g/L. attemtp at solution volume of oxygen= .209476*50L=10.5L How do

    asked by jason on November 8, 2008
  30. chem

    Calculate delta G, delta A, and delta Stotal for each of the following processes and state any approximations made: (a) Reversible vaporization of 39 g of C6H6 at its normal boiling point of 80.1°C and 1 atm; (b) Adiabatic reversible expansion of 0.100

    asked by tang on October 5, 2017
  31. English

    Thank you very much for your corrections. I still have a few alternatives for you to check. 1) The demand for new clothes created the necessity (better: caused the development of new machinery?) to invent machinery for cloth-making. 2) New factories were

    asked by Franco on November 26, 2010
  32. Physics

    container holding 340g of water (initially at 14 degrees celsius) is placed in microwave oven, which is turned on for 3 minutes. Assuming all microwave energy is absorbed by water, how much water is left in container?

    asked by Dave on April 25, 2012
  33. science

    Low water flows are a common problem for ecosystems in semi-urban streams. Should the suggestion of using domestic drinking water supplies to increase water flows in the streams be adopted?

    asked by Anonymous on July 24, 2012
  34. Physics

    An 75 kg man drops from rest on a diving board −3.1 m above the surface of the water and comes to rest 0.6 s after reaching the water. The acceleration due to gravity is 9.81 m/s2. What force does the water exert on the man? Answer in units of N.

    asked by Michael N. on January 24, 2011
  35. math

    A fisherman has caught a 5kg fish with a line and is lifting it vertically out of the water. While the fish is still in the water he raises it at a constant speed of 0.4 ms^-1. If the water resists this motion with a force of 6N, what is the tension in the

    asked by todd on October 26, 2013
  36. chemistry

    The heat of fusion of water is 335 J/g, the heat of vaporization of water is 2.26 kJ/g, and the specific heat of water is 4.184 J/deg/g. How many grams of ice at 0 ° could be converted to steam at 100 °C by 9,946 Joules of heat?

    asked by Dakota on November 15, 2013
  37. PHYSICS!

    An 70 kg man drops from rest on a diving board 3.2 m above the surface of the water and comes to rest 0.57 s after reaching the water. The acceleration due to gravity is 9.81 m/s2. What force does the water exert on the man? Answer in units of N.

    asked by MIKE HUNT on October 29, 2008
  38. Chemistry

    When 155 mL of water at 26 degrees Celsius is mixed with 75 mL of water at 95 degrees Celsius, what is the final temperature of the mixture? (d Water = 1.00 g/mL) Im really stuck on this problem and chemistry isnt exactly my strong point, thanks in

    asked by David on May 19, 2014
  39. physics

    If you slosh the water in a bathtub at the correct frequency, the water rises first at one end and then at the other. Suppose you can make a standing wave in a 145 cm long tub with a frequency of 0.31 Hz. What is the velocity of the water wave?

    asked by Anonymous on March 9, 2012
  40. science

    A mass,m of water at 100degree celcius is added to another mass of water ,m at a temperature,t. The reslting temperature of the mixture is T. If the specific heat capacity of water is 4.2J/gk. Drive an expression for L terms of other quantities.

    asked by n s k on April 22, 2012
  41. PHYS

    the water in a swimming pool transfers 1.09 x 10^10 J of energy as heat to the cool night air. If the temp of the water, which has a specific heat capacity of 4186 J/kg x °C, decreases by 5.0°C, what is the mass of the water in the pool?

    asked by arriell on November 2, 2009
  42. physics

    An 70 kg man drops from rest on a diving board −2.9 m above the surface of the water and comes to rest 0.58 s after reaching the water. The acceleration due to gravity is 9.81 m/s 2 . What force does the water exert on the man? Answer in units of N

    asked by allioe on January 10, 2014
  43. physics

    Water is forced out of a fire extinguisher by air pressure. How much gauge air pressure in the tank (above atmospheric) is required for the water jet to have a speed of 34.6 m/s when the water level is d = 0.520 m below the nozzle?

    asked by Anonymous on December 4, 2009
  44. physics

    The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 62-gal (1.00 gal = 3.79 x 10-3 m3) unit starts with cold water at 11 °C and delivers hot water at 53 °C. The unit is

    asked by Anonymous on February 18, 2013
  45. Physics

    The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. Suppose that a 62-gal (1.00 gal = 3.79 x 10-3 m3) unit starts with cold water at 11 °C and delivers hot water at 53 °C. The unit is

    asked by Anonymous on February 18, 2013
  46. physics

    The basic function of the carburetor of an automobile is to atomize the gasoline and mix it with air to promote rapid combustion. As an example, assume that 31.0 cm3 of gasoline is atomized into N spherical droplets, each with a radius of 8.00 10-5 m. What

    asked by neeba on September 13, 2012
  47. S

    An automobile travelling at 80km/hrs has tyres of radius 80cm. On applying brakes the car is brought to a stop in 30 complete turns of the tyres. What is the magnitude of the angular acceleration of the wheels? How far does the car move while the brakes

    asked by Jitender on February 15, 2017
  48. physics

    the human body can survive a negative acceleration trauma incident if the magnitude of the acceleration is 250m/sq. s. If you are in an automobile accident with an initial velocity of 29.17 m/s and are stopped by an airbag that inflates from the dashboard,

    asked by judel on February 23, 2017
  49. Calculus

    A cylindrical water tank has a radius of 2 feet and a height of 6.0 feet. Compute the work done to pump the water out of a filled tank through the top. [The density of water is 62.4 lbs/ft3.]

    asked by Beth on December 6, 2011
  50. math

    A water delivery truck with a cylindrical tank measuring 8 ft in diameter and long dispenses water to drought victims in cartons measuring 6 in. × 6 in. × 12 in. How many victims will get a full container of water?

    asked by kate on December 21, 2009
  51. math

    A water delivery truck with a cylindrical tank measuring 8 ft in diameter and 8 ft long dispenses water to drought victims in cartons measuring 6 in. × 6 in. × 12 in. How many victims will get a full container of water?

    asked by Brandi on October 29, 2009
  52. Math

    A water delivery truck with a cylindrical tank measuring 8 ft in diameter and 8 ft long dispenses water to drought victims in cartons measuring 6 in. × 6 in. × 12 in. How many victims will get a full container of water

    asked by Chris on October 26, 2009
  53. Math

    A fire hose has a circular cross-section which has a diameter of 20 cm. The hose is full of water and the water in the hose is flowing at a speed of 5m/s. How many liters of water can flow from the hose in 1 minute? (1m^3 = 1000 L)

    asked by Maria on October 23, 2012
  54. math

    A water delivery truck with a cylindrical tank measuring 8 ft in diameter and long dispenses water to drought victims in cartons measuring 6 in. × 6 in. × 12 in. How many victims will get a full container of water?

    asked by kate on December 20, 2009
  55. physics

    A 400 calorie quantitiy of heat is added to 20 grams of water and as a result, the water reaches a final temp of 70 deg. C. The starting temp of the water was most nearly _____ deg C.

    asked by Sonya on November 12, 2010
  56. Precalculus

    Water is flowing at the rate of 50 m^3/min from a conical reservoir (vertex down) of base radius 45 meters and height 6 meters. What is the water level when the reservoir has 5000 m^3 of water left in it?

    asked by Maddie on August 17, 2015
  57. chemistry

    The boiling point of water at 735mmHg is 99.073C. What mass of NaCl should be added to 3.11kg water to increase the boiling point to 100.000C. Kb for water = 0.510K kg mol-1.

    asked by Gina on October 11, 2010
  58. Calculus

    Water is flowing into a hemispherical bowl having a radius of 10cm at constant rate of 3cm^3/min. When the water is x cm deep, The water level rises at a rate of 0.0149 cm/min. What is the value of x?

    asked by Francois on September 26, 2016
  59. Geometry

    A water delivery truck with a cylindrical tank measuring 8 ft in diameter and 8 ft long dispenses water to drought victims in cartons measuring 6 in. × 6 in. × 12 in. How many victims will get a full container of water?

    asked by aleah on November 23, 2009
  60. math

    A water delivery truck with a cylindrical tank measuring 8 ft in diameter and 8 ft long dispenses water to drought victims in cartons measuring 6 in. × 6 in. × 12 in. How many victims will get a full container of water?

    asked by Brandi on October 31, 2009
  61. physics

    calculate the refractive index for a ray travelling from air to water given that the angle of incidence is 30degrees and the angle of refraction in the water is 22 degrees.Determine the speed of the ray in water.

    asked by ceasar on November 10, 2011
  62. Physics

    A raft is 4.2 m wide and 6.5 m long and it floats on water (density of water = 1000 kg/m3). When a horse is loaded onto the raft, it sinks an additional 0.027 m deeper into the water. What is the weight of the horse (in N)?

    asked by Joe Shmo on July 22, 2013
  63. Physics-science

    A block of wood has a mass of 3.6kg and specific gravity of 0.6. It is to be loaded with lead of density of 11300 kg per cubic metre so that it floats in water with 0.90 of its volume immersed. What mass of lead is needed? (a) if the lead is on top of the

    asked by KAZIN BONNY on January 2, 2016
  64. Chemistry/pH- Weak Acid

    Hi again! I have a new question, Can you help me? Consider 50.0 mL of a solution of a weak acid HA (Ka = 1.00.E-6), which has a pH of 4.000. What volume of water must be added to make the pH = 5.000? My Calculations: To calculate the concentration of x, I

    asked by Mary on August 17, 2008
  65. Physics

    Hi im new so maybe one of you can help me understand this question, can't find it anywhere in the book. A person weighs 723N in air and has a body-fat percentage of 29.3% . What is the overall density of this person's body? What is the volume of this

    asked by Danny on December 4, 2009
  66. chemistry

    Vinegar is a solution of acetic acid, a weak acid. How can you produce more acetate ions in the solution? CH 'subtext' 3 COOH(aq) H+(aq) + CH 'subtext' 3 COO^- (aq) A. Evaporate some of the water. B. Decrease the pressure. C. Increase the volume of the

    asked by emma on September 10, 2016
  67. AP Physics

    Hi im new so maybe one of you can help me understand this question, can't find it anywhere in the book. A person weighs 723N in air and has a body-fat percentage of 29.3% . What is the overall density of this person's body? What is the volume of this

    asked by Danny on December 3, 2009
  68. Organic Chemistry

    Assume that a round bottom flask holds 100 mL and the distilling head has an internal volume of 12 mL in the vertical section. At the end of a distillation, vapor would fill this volume, but it could not be forced through the system. No liquid would remain

    asked by Omama on October 19, 2010
  69. Engineering

    Three CSTRs are used in series. The second reactor has a volume twice that of the first and third reactors. The influent flow has a concentration of 150 mg/l of A, and the flowrate is 380 l/min. The reaction is first order, the rate equation is -dCa/dt=

    asked by Anonymous on October 7, 2018
  70. Chemistry - Urgent Please help!!

    The problems: 0.0513 grams of Al (Wt. 27.0) was reacted with excess HCI to produce H2 according to the following balanced equation: 2 Al + 6 HCI ---> 2 AlCl3 + 3 H2 a) Determine the number of moles of H2 evolved from that quantity of Al when collected over

    asked by Kishwa on April 23, 2013
  71. Chemistry

    Test corrections :) They're calculations/short answers. I'd just like something to compare answers to or help me get the full answer (all partial credits). Thanks! #9. When water is electrolyzed it produces hydrogen and oxygen. If 10.0% of 150.0g of water

    asked by Nina on May 30, 2012
  72. Visitor623

    I could not find this site in the Search Engines index This is not a search engine. You can find it among the first 10 listed by Googling the words "homework help", with or without quotes.

    asked by Visitor623 on July 28, 2007
  73. Physics

    An electric heater that produces 860 W (1 W = 1 J/s) of power is used to vaporize water. How much water at 100 0C can be changed to steam in 5 min by the heater? Use Lv = 2.25x106 J/kg for water at 100 0C and express your final answer in grams.

    asked by Anonymous on June 7, 2016
  74. Physics

    You are heating water in a pot on the stove. Shortly before the water boils properly, bubbles of steam begin rising from the bottom of the pot but vanish before they reach the water’s surface. What happened to those bubbles?

    asked by Bob on May 30, 2012
  75. science

    Does salt water evaporate faster than fresh water? No. The reduction in vapor pressure and evaporaton rate is related to the fraction of the surface that is salt ions instead of water molecules. The Na+ and Cl- ions are not volatile.

    asked by Kara on February 15, 2007
  76. chemistry

    A 0.90g sample of liquid water was introduced into an evacuated 2.00 L flask, which was then sealed and heated to 37 (degree)C. What percentage, by mass, of the water remained as liquid? [Vapor pressure of water at 37 (degree)C=48.2 torr]

    asked by Jim on June 23, 2010
  77. Physics

    Brett decided that he was going to go bungee jumping at the WEM mall water park. If Brett weighs 95kg and he is 30 m above the water, how far will he fall IF the elastic force of the bungee cord is 1000N? Will he hit the water?

    asked by Jocelyn on November 11, 2012
  78. Physics

    You are heating water in a pot on the stove. Shortly before the water boils properly, bubbles of steam begin rising from the bottom of the pot but vanish before they reach the water’s surface. What happened to those bubbles?

    asked by Bob on May 29, 2012
  79. chemistry

    A 10.0 g sample of liquid gallium metal, at its melting point, is added to 50.0g of water. The initital temperature of the water is 24.0 degrees C. If the molar enthalpy of freezing gallium is -5.54 kj/mol, what is the final temperature of the water?

    asked by Bob on November 8, 2010
  80. science

    which of the following properties of water explains its characterization as the universal solvent. a)kinetic energy of liquid water molecules b)high specific heat c)polarity of water molecules d)high surface tension

    asked by Brenda on August 26, 2015
  81. physics

    Water towers store water above the level of consumers for times of heavy use, eliminating the need for high-speed pumps. How high above a user must the water level be to create a gauge pressure of 3.00×105 N/m2 ?

    asked by Mohanad on April 7, 2014
  82. Chemstry

    Dry air is bubbled through 25 litres of water at a rate of 15 litres (STP)/min. The air leaving the liquid is saturated with water at 25 degrees celcius and 1.5 atm. How long it will take for all of the water to vaporize.

    asked by Simon on August 5, 2012
  83. physics

    Water at 29.0 °C is sprayed onto 0.188 kg of molten gold at 1063 °C (its melting point). The water boils away, forming steam at 100.0 °C and leaving solid gold at 1063 °C. What is the minimum mass of water that must be used?

    asked by anonymous on August 30, 2015
  84. science

    A lever scale is balanced with a partially filled glass of water on one side. Will the balance be upset (and if so how?) if you put your finger carefully into the water without touching the glass? What happens if the beaker is filled with air instead of

    asked by annonymous on February 13, 2014
  85. Chemistry

    A 1.0-mL volume of 0.010 M H2SO3 is added to a mixture of 12 drops of 0.010 M HIO3, 8 drops of deionized water, and 1 drop of starch solution. a color change occured after 40 seconds. assuming 25 drops per mL for all solutions, determine the initial molar

    asked by Anonymous on February 22, 2013
  86. Chemistry (Check)

    In a calorimeter experiment done at constant pressure in which all the heat from a chemical reaction was absorbed by the surrounding water bath, the temperature of the water went up by 2.31 K. If the size of the water bath was 200 g, what was the amount of

    asked by Anonymous on November 13, 2015
  87. Physics

    In a hydroelectric dam, water falls 26.0 m and then spins a turbine to generate electricity. What is ∆U of 1.0 kg of water? Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must

    asked by Zach on November 30, 2009
  88. Chemistry

    Balanced Chemical Equation: 1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H20(g) If you start with: 5.0 x 10^4g hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yielded)? 2) How many moles of water can be produced? 3)

    asked by Roger on November 19, 2010
  89. Chemistry

    Balanced Chemical Equation: 1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H20(g) If you start with: 5.0 x 10^4g hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yielded)? 2) How many moles of water can be produced? 3)

    asked by Roger on November 19, 2010
  90. Chemistry

    A sample of KHC2O4 weighing 0.5839 g is dissolved in 25 mL of water and an endpoint is reached when 31.99 mL of KOH has been added. Calculate the molarity of the KOH solution. KHC2O4(aq) + KOH(aq) ¨ K2C2O4(aq) + H2O(l) because the coefficents are all

    asked by Andrew on January 9, 2008
  91. Chemistry

    A volume of 10cm^3 of 2M H2SO4 is placed in a volumetric flas of 250cm^3 and filled to the mark with distilled water. What is the molar conc. of the H2So4 in the flask? After I found how many moles there are in 10cm^3, which is 0.02 mol, what is my next

    asked by Matt on December 30, 2012
  92. chemistry

    1. If a gaseous sample contains 73% N2 by volume, what is the solubility of N2 in water at 25°C and 1.0 atm (kH in H2O at 25°C = 7.0 10-4 mol/Latm)? 2. Calculate the vapor pressure of a solution of 0.60 mol of cholesterol in 4.5 mol of toluene at 32°C.

    asked by Ashley on January 31, 2011
  93. Science questions

    Leaving a beaker of water open to the air until it is empty is a phisscal or chemical change ? Heating a piece of calcium carbonate is a physical or chemical change ? Adding copper sulphate to crystal water is it a chemical or physical change? How to seeds

    asked by Wales on May 2, 2007
  94. Algebra 2

    Ordinary corn syrup contains dextrose sugar. A process called enzyme conversion changes it into a syrup that is 42% fructose. This new syrup can be further treated with fractionation columns to make a syrup that is 95% fructose (high fructose corn syrup).

    asked by Anonymous on February 13, 2014
  95. Physics

    To supply the plumbing system of a New York office building, water needs to be pumped to a tank on the roof, where its height will provide a "head" of pressure for all the floors. The vertical height between the basement pump and the level of the water in

    asked by Steven on June 15, 2012
  96. Chemistry

    The solubility of KNO3 is 80g/100g water at 50 degrees and 10g/100g water at 0 degrees. The solubility of CuSO4 is 60g/100g water at 50 degrees and 20g/100g water at 0 degrees. A mixture contains 13.8g of KNO3 and 1.94g of CuSO4. A) Calculate the minimum

    asked by Lauren on October 6, 2014
  97. physics

    An engine does 17700 J of work and rejects 6320 J of heat into a cold resevoir whose temperature is 283 K. What would be the smallest possible temperature of the hot resevoir?

    asked by Anonymous on November 7, 2012
  98. English

    I just wanted to know if number 2 is completely wrong. 1.I havent' finished repairing the car enginge. 2.I haven't finished to repair the car engine. Thank you.

    asked by Henry2 on September 6, 2011
  99. physics

    .10 kilogram rocket designed to deliver an impulse of 6 newtons seconds. If the rocket engine burns .75 seconds, what average force does it produce.

    asked by trent on November 19, 2013
  100. 12th Calculus

    a cone of height h and radius r is constructed from a flat, circular disk of radius 4 inches. by removing a sector AOC of arc length x inches. and then connecting the edges OA and OC. what are length x will produce the ocne of maximum volume, and what is

    asked by elley on November 17, 2008