1. chemistry

    If you ran silver nitrate on tap water and distilled water,which one may show a slightly positive reaction? Why?
  2. science

    If the aim is to let a 700 kg pump flout on the surface of water, how many cylinders ( 50cm*90cm ) containing fresh water should we have ?
  3. chemistry

    Water is a polar solvent. Which of the following will not dissolve in water? sugar table salt vinegar olive oil
  4. physics

    Water flows over a section of a waterfall at the rate of 5.4 104 kg/s and falls 38 m. How much power is generated by the falling water?
  5. college chemistry

    The solubility of Ar in water at 321.9 torr is 0.02538 g/L. What is Henry's Law constant (M/atm) for Ar in water?
  6. Physical Science

    A quantity of water is poured into a graduated cylinder, which then reads 145ml. what is the mass of the water in kilograms?
  7. math

    A marathon is 26.2miles long. there is a water station every 1 31/100miles along the rare route. What is the number of water stations?
  8. chemistry

    what would be the vapor pressure of water in a solution wiith 23.7g NaCl dissolved in 500mL of water at 50degrees centigrade
  9. chemistry

    what is the freezing point of a solution that contains 20.2g of urea CO(NH2)2 in 295mL water? Assume a density of water of 1.00g/mL
  10. science

    what will you measure to record data of the experiment of mixing water and sugar/salt dissolved in hot water?
  11. Chemistry

    I need to find the boiling point, but I am confused on this question 0.250M glucose in water (assume the density of water is 1.00 g/ml)
  12. phys

    A 0.600-kg aluminum teakettle contains 4.00 kg of water at 26.0° C. How much heat is required to raise the temperature of the water (and kettle) to 100.0° C?
  13. chemistry

    what is something that would lower the freezing point of water to -3.7 degrees c if one mole were placed in 1000 g of water? I don't understand how to do this question, I'd appreciate the help (: Thank you
  14. chemistry

    What is the molality of a solution prepared by dissolving 75.2 g of ethylene glycol, HOCH2CH2OH, in 1.34 L of water? Assume the density of water is 1.00 g/ml.
  15. chemistry

    the vapor pressure of water at 25 C is 27.66 torr. is 0.5 g water is enclosed in a 1.5 L sealed container, will there be nay liquid. If yes, what mass?
  16. Chemistry

    If 689000 J of energy are added to 4.00 L of water at 284 K, what will the final temperature of the water be? Answer in units of K
  17. physics

    If the pelican was traveling at the same speed but was only 2.3 m above the water, how far would the fish travel horizontally before hitting the water below? Answer in units of m
  18. Chemistry 110

    Pure water in contact with air has a higher conductivity than the same water that has had nitrogen gas bubbled through it. Why?
  19. chem

    A 5.0×101 kg sample of water absorbs 312 kJ of heat.If the water was initially at 20.1C, what is its final temperature?
  20. chemistry

    how much heat, in kilojoules, must be added to 178 grams of water to increase the temperature of the water by 50 degrees celisus?
  21. Physics

    Work of 730 J is done by stirring an insulated beaker containing 80 g of water. What is the change in the temperature of the water? Please show calculation
  22. chemistry 110

    Pure water in contact with air has a higher conductivity than the same water that has had nitrogen gas bubbled through it. Why?
  23. chemistry

    Use the heat of fusion of water, 79.7 cal/g. to answer the following question. How much energy in calories is released when 30.0g of water freezes?
  24. match

    If a lateral line ditch will store 800 gallons of water how long will it take for one inch of water to be absorbed?
  25. Physics

    Water flows over a section of a waterfall at the rate of 4.9 104 kg/s and falls 36 m. How much power is generated by the falling water?
  26. Chemistry

    How much energy in kilocalories is needed to vaporize 255g of water? The heat of vaporization of water is 540 cal/g.
  27. Chemistry

    What is the freezing point of a solution that contains 21.1g of urea, CO(NH2)2, in 305mL water, H2O? Assume a density of water of 1.00 g/mL.
  28. IPC

    If the specific heat of water is 1.0 calorie/gram°C, how many calories are required to raise 500 grams of water 10.0°C?
  29. Chemistry

    What is the molality of a solution prepared by dissolving 81.5 g of ethylene glycol, HOCH2CH2OH, in 1.36 L of water? Assume the density of water is 1.00 g/ml.
  30. chemistry

    A 46kg sample of water absorbs 4.00×102kJ of heat. If the water was initially at 29.7 ∘ C , what is its final temperature?
  31. physics

    If the pelican was traveling at the same speed but was only 2.3 m above the water, how far would the fish travel horizontally before hitting the water below? Answer in units of m
  32. physics

    A water fall is 84 metre.If half of kinetic energy is converted into heat.What is the rise in the temperature of water?
  33. Chemistry

    A backyard swimming pool holds 185 cubic yards (yd^3) of water. What is the mass of the water in pounds?
  34. science

    How joules many are needed to heat 1500 gram pot of water up to (100c) water temp is 22c
  35. Science

    Which of the following best describes the process in which surface water becomes water vapor? A. condensation B. Precipitation C. Percolation D. Evaporation My answer A
  36. Chemistry

    A 249-gram sample of water is heated from 2° C to 85° C. Calculate the amount of heat absorbed (in kJ) by the water. Please explain.
  37. Chemistry

    A 45-kg sample of water absorbs 345 kJ of heat. If the water was initially at 22.1 degrees celcius, what was the final temperature?
  38. physics

    if an adult gets 50cc plus 850 water eaquling 900. what is the ration for a child when the final # is 40 . what amount cc, to water?
  39. Earth Science

    How do increased understanding of the hydrosphere, watersheds and human uses of water support the phrase, "Water is life?'
  40. chemistry

    if the solute is MgSO4 and it is disolved in 800g water water are the ideal melting and boiling pionts of the solution?
  41. Physics

    What is the magnitude of buoyant froce acting on a 720 cm^3 toy submarine foating in fresh water? (d water=1 g/cm^3)
  42. chemistry

    The molal freezing point constant for water is 1.86 C/m. at what temperature will a micture of 2.00g of CalCl2 and 25.0g of water freeze?
  43. Chemistry

    The heat of vaporization of water is 9.73 kcal/mol. At what pressure (in torr) would pure water boil at 89◦C?
  44. Chemistry/Math

    The density of water is 1 g/cm^3. What is the mass of 7.500 liters of water reported in kilograms? I got 7.5kg. Is this correct?
  45. chemistry

    A total of 506 J of heat are added to 50.0 g of water initially at 15.0 degrees Celsius. What is the final temperature of the water?
  46. chemistry

    how to calculate the ph level of 2.5g NaOH, 2g H2SO4 and 1.5g ethenoic acid in water? Each compound being put in a liter of water.
  47. Math

    A running tap dispenses 0.15 gallons of water every second. How many pints of water is dispensed after 20 seconds? Please show me how to get the answer.
  48. chemistry

    14. 100 g of water, H2O, is heated from 25C to 50C. What is the entropy change for the process? Cp = 4.2J/K·mol for water?
  49. PHyiscs

    A HELICOPTER hovering above a forest fire dumps a large bucket of water. How far does the water fall in the first 3.0 seconds t=3.0s
  50. science

    sodium flouride is soluble in water at the rate of 4.09g/100g of H20. how much will dissolve in 500g of water
  51. Physics

    Little Timmy falls down a well and hits the water 1.5s later. Determine the distance from the top of the well to the water below. Just an equation would be fine. Thanks in advance.
  52. chemistry

    Calculate the molar mass of a non-electrolyte that lowers the freezing point of 25.0 g of water to - 3.9 oC when 4.27 g of the substance is dissolved in the water.
  53. physics

    The bulk modulus of water is B = 2.2 x 109 N/m2. What change in pressure ÄP (in atmospheres) is required to keep water from expanding when it is heated from 11.2 °C to 38.8 °C?
  54. Chemistry

    Calculate the change in heat when 11.5 g of water vapor (steam) at 100.0°C condenses to liquid water and then cools to 5.00 °C
  55. Chemistry

    A fish tank holds 40 gallons of water (density 1.00g/mL) when full. What is the mass of the water in kilograms (kg)?
  56. physics

    Water falls from a height of 84 m. Assuming that all the energy is converted into heat, the rise in temperature of water will be (4200 J/(kg °C) and g=10 m/s2)?
  57. nursing

    Because water is an essential requirement for sustaining life, why is local or international water assessment necessary to prevent disease?
  58. Physics

    A plastic tube allows a flow of 13.4 cm^3 /s of water through it. How long will it take to fill a 215 cm^3 bottle with water? Answer in units of s
  59. chemistry

    When a certain amount of MgF2 is added to water, the freezing point lowers by 3.5 oC. What was the molality of the magnesium fluoride? (Kf for water = 1.86 oC/m)
  60. Chem

    What gas law explains why hot water diffused the food coloring faster than the cold water?
  61. ipc

    If the specific heat of water is 1.0 calorie/gram C how many calories are required to raise 500 grams of water 10.0C
  62. Chemistry

    A 5.0×101kg sample of water absorbs 3.10×102kJ of heat. If the water was initially at 21.3 ∘ C, what is its final temperature?
  63. chemistry

    50.0 mL of water is heated from 60 C to 85 C. How much heat was absorbed by the water sample in joule Can anybody help me understand the process or rules to figuring this out? Thanks
  64. chemistry

    A 43 kg sample of water absorbs 343 kJ of heat. If the water was initially at 22.1°C, what is its final temperature? I got 1.9 but i think i didn't do it correctly
  65. chemistry

    The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer.
  66. math

    Determine the water level inside a tank that has a diameter of 40 feet and contains 180,000 gallons of water?
  67. Math

    Joe takes twice as long as to row against a current as with it. If he rows 6 miles an hour in still water, what is the rate of the water?
  68. science

    To conserve water, an animal's kidneys can pump ions across cell membranes, allowing water to move by
  69. chemistry

    Calculate the Calorimeter Constant if 25 g of water at 58C was added to 25 g of water at 25C with a resulting temperature of 35C?
  70. chemistry

    The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer.
  71. math

    water has a chemical formula h2O which means each molecule of water contains two atoms of hydrogen one atom of oxygen if oxygen atom has a mass 16 times as much as the hydrogen one .what are the propotions of oxygen and hydrogen in 2kkg of water
  72. Mathss

    Item 20 A bathtub is draining at a constant rate. After 2 minutes, it holds 28 gallons of water. Three minutes later, it holds 7 gallons of water. Write an equation that represents the number y of gallons of water in the tub after x minutes.
  73. Air conditioning

    The partial pressure of water vapor in an atmosphere at 35oC and 740 mm Hg pressure is 37 mm Hg. What is the relative humidity? What is the actual concentration of water vapor, expressed in ppm? The vapor pressure of water at 35oC is 42 mm Hg.
  74. Physics

    An automobile tire has a radius of 0.380 m, and its center moves forward with a linear speed of v = 19.0 m/s. (a) Determine the angular speed of the wheel. (Assume that there is no slipping of the surfaces in contact during the rolling motion.) rad/s (b)
  75. Chemistry

    Compounds like CCL2F2 are known as chloroflourocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is
  76. Chemistry

    The question on one of my assignments says, "Explain why a thick layer of ice on the lake can support the weight of a person, but the liquid water cannot." I would assume it's because solids are solid and liquids are liquid, but I feel like they want a
  77. chemistry

    would the molar mass of a volatile liquid, calculated using the procedure in this experiment, be incorrectly high, incorrectly low, or unaffected by the following? You forgot to measure the volume of the flask, so you used the volume printed on the g=flask
  78. chemistry

    What volume of air is needed to burn an entire 60-L (approximately 16-gal) tank of gasoline? Assume that the gasoline is pure octane, C8H18. Hint: air is 20% oxygen by volume, 1 mol of a gas occupies about 25 L at room temperature, and the density of
  79. chem

    would the molar mass of a volatile liquid, calculated using the procedure in this experiment, be incorrectly high, incorrectly low, or unaffected by the following? You forgot to measure the volume of the flask, so you used the volume printed on the g=flask
  80. Science

    Was the term 'water closet' from John Harington, who invented the toilet long ago? Water closet seems to mean either the toilet or a room with the toilet. Then the water closet which John Harington invented was a toilet bowl, its seat and water tank in the
  81. Chemistry

    Pure ethanoic acid (25.0cm3, CH3COOH), pure ethanol (35.0 cm3, C2H5OH) and pure water (20.0cm3, H2O) were mixed in a sealed flask at room temperature. The flask was placed in a heated water bath and maintained at 323K until equilibrium was established.
  82. Physical Science

    These are two questions that I need help with: 1.What statement about light traveling through water and glass is true? A.Water and glass absorb different colors of light B.Light changes colors as it passes from water to glass C.Light travels at different
  83. chemistry

    Can someone please tell me the tools needed to measure amount of substance, area, volume, density, energy, and pressure? Thanks in advance! It depends on what you are measuring and the quantity. For amount of substance, the mass can be measured with a
  84. physics

    A 50.2 kg child slides down a water slide with a velocity of 1.1 m/sec at the top. At the bottom of the slide, she is moving horizontally, 1.5 meters above the water. She splashes into the water 2.5 meters to the right of the bottom of the slide. a)
  85. math

    In a Grand Prix automobile race, Speedy Ryder averaged 110 miles per hour for the first half of the course and 130 miles per hour for the second half of the course. Cannonball Carter maintained a constant speed of 120 miles per hour throughout the race.
  86. math

    In a grand prix automobile race, Speedy Ryder averaged 110 miles per hour for the first half of the course and 130 miles per hour for the second half of the course. Cannonball Carter maintained a constant speed of 120 miles per hour throughout the race.
  87. chemistry/engineering

    Wet sugar, containing one-fifth water by mass is conveyed through an evaporator in which 85.0% of the entering water is vaporized. Taking a Basis of 100 kg of feed to the evaporator A barrel of oil contains about 6 million Btu and about 1000 Btu is needed
  88. physics

    a car of the mass m kg travels on a straight,level road. the driving force of the engine is 4000N and the total resistance due to air friction and tires on the road is 300N. if the car accelerates at 3m/s2 ,what is the mass m of the car
  89. Mpindweni s.s.s science

    A rocket of mass 5000kg is launched vertically upwards into the sky at an acceleration of 2om/s. The magnitude of the force due to gravity on the rocket is 49000 N calculate the magnitude and diretion of the force of the rocket's engine.
  90. Physics

    A toy rocket is launched upwards from rest. The rocket engine will cause the rocket to accelerate at 25 m/s^2 for 3.0 seconds. a) How fast is the rocket moving aft the end of the 3 seconds? b) What is the maximum height reached by the rocket? c) What is
  91. math who helps me step by step

    25g of a sample of ferrous sulphate was dissolved in water contains dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of N/10 kmn04 solution for complete oxidation. Calculte the percentage of f2s04 7 h20 in the sample My
  92. Chemistry

    Thanks for your help; I am still have a few problems, could you check my work: Given: Volume of vinegar analyzed-5mL Con'c of NaOH-0.09890M Avg. Volume of NaOH from titration-43.75mL Density CH3COOH: 1.049g/mL Calculations: 1.Moles of NaOH required to
  93. Physics

    While stationary on a boat you are measuring the time it takes for the coin to leave your hand and hit the water.In order to measure that time you are tuned to the sound of the coin hitting the water. You know that it takes 5.5 seconds for the coin to
  94. Chemistry

    These are the answers I got for the following problems - am I right? 1) How many grams of water, H2O, and propene, C3H6, can be formed from the reaction of 6.0 g of 2-propanol, C3H8O? C3H8O ----> C3H6 + H2O 1.8g H2O and 4.2g C3H6 2) How many moles of
  95. calc

    hydrogen is being pumped into a spherical balloon at the rate of 250 cubic inches per minute. in a and b, you must provide an equation with their proper numerical factors when showing the relationships inquired A) write an equation showing the relationship
  96. Math

    Some of Helen's plants need water every day, some need water every other day, and others need water every third day. If she waters them all today, how many days will it be before she waters them all again?
  97. math

    A tank is 1/4 filled of water.when 90 liters of water are pumped into it the tank becomes 3/4 full.how much water in liters does the tank hold?
  98. Physics

    The work done by one mole of a monatomic ideal gas (gamma=5/3) in expanding adiabatically is 964 J. The initial temperature and volume of the gas are 395 K and .0848 m^3. Obtain a) the final temperature and b) the final volume of the gas.
  99. Chemistry

    A gaseous reaction occurs at a constant pressure of 50.0 atm and releases 69.8 kJ of heat. Before the reaction, the volume of the system was 8.80 L . After the reaction, the volume of the system was 2.80 L . Calculate the total internal energy change,
  100. Chemistry

    A sample of gas is confined to a cylinder housed with a movable piston. Initially, the gas occupies a volume of 2.7 L at 6.0 atm and 25°C. Calculate the volume of the gas sample if the pressure is reduced to 1.8 atm and the temperature decreased to 20°C.