1. chem-intermolec forces

    are covalent bonds broken when.... melt benzene melt quartz boiling C2H5OH evaporating water disolving bromine in water?

    asked by Jay on December 2, 2008
  2. chemistry

    A 25.0 g piece of copper at 90.0 C is placed in 100.0 g of water at 20.0 C. What is the temperature (in C) of the water once the system reaches equilibrium? The molar heat capacity of copper is 24.5 J/(mol·K).

    asked by erika on October 17, 2010
  3. Chemistry

    What concentration of aqueous CaCl2 solution freezes at -10.2ºC? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/m. A. 5.48 m B. 11.0 m C. 1.83 m D. 6.12 m E. 2.74 m

    asked by Michelle on August 21, 2010
  4. physical science

    a ball was dropped off a cliff and took 3.59s to fall to the water below. neglecting air resistance how fast in m/s was the ball moving just as it hit th water

    asked by lora on June 18, 2012
  5. science

    The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?

    asked by Quan on June 5, 2013
  6. IPC

    The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?

    asked by Katy on October 12, 2010
  7. science

    If the two ponds were perennial (i.e., year-round) ponds, because of intersecting the water table, how would the presence or absence of water in the other depressions differ from that which is shown?

    asked by Lola on June 17, 2013
  8. Chemistry

    The combustion of how many moles of ethane would be required to heat 838 grams of water from 25.0 to 93.0 degrees C? Assume liquid water is formed during the combustion.

    asked by k on November 2, 2012
  9. physics

    A 1.0m³ block of ice floats in fresh water. 92% of its volume is below the surface of the water. What is the magnitude of the buoyancy force acting on the block?

    asked by Anonymous on November 12, 2018
  10. Physics help please!

    A cylindrical metal can with a radius of 4.25 cm is floating upright in water. A rock is placed in the can, causing it to sink 0.0230 m deeper into the water. What is the weight of the rock?

    asked by Sammy on June 15, 2012
  11. math

    About 80% of the mass of a human body is water. If Hugo is 85kg, how man kilograms of water are in his body? this question is for financial mathematics topic

    asked by MN on February 1, 2017
  12. general physics

    Determine the minimum gauge pressure needed in the water pipe leading into a building if water is to come out of a faucet on the twelfth floor, 38 m above that pipe.

    asked by Anonymous on April 18, 2010
  13. chemistry

    a metal object has a mass of 8.37g. when it was placed in a graduated cylinder containing 20.0ml of water, the water level rose to 23.1 ml. what is the density and identity of the metal?

    asked by kim on February 16, 2014
  14. Physics

    A cylindrical metal can with a radius of 4.25 cm is floating upright in water. A rock is placed in the can, causing it to sink 0.0234 m deeper into the water. What is the weight of the rock?

    asked by Jamie on June 17, 2012
  15. Ancient cultures

    This water feature was a means of travel for the ancient peoples and in the modern era was significant during the military conflict within the region. What is this water feature?

    asked by Kerry on March 10, 2008
  16. Physics

    "Water flows over a section of Niagara Falls at the rate of 1.2*10^6 kg/s and falls 50.0m. How much power is generated by the falling water?" It's a the kg/s that is confusing me. I don't know how to work with it.

    asked by Stuck on July 25, 2010
  17. Science

    if you are given a graduated cylinder that has 56ml of water in it and you drop a rock into the cylinder, the water level rises to 62ml. explain how you find the density

    asked by Anonymous on September 7, 2017
  18. Math

    Yan water leaks from a hemispherical bowl of 8 cm diameter at the rate of 10 cm per hour .How fast is the surface falling when the water is 2 cm deep in the bowl

    asked by Yan on September 8, 2015
  19. chemistry

    What concentration of aqueous CaCl2 solution freezes at -10.2ºC? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/m.

    asked by Cecilia on September 1, 2010
  20. science

    Calculating A sample of barium nitrate is placed into a jar containing water. The mass of the barium nitrate sample is 27 g. Assume the water is at 20 ºC and that the resulting barium nitrate solution is saturated. What mass of water is present in the

    asked by diane on December 21, 2011
  21. organic chemistry

    suppose solute A has a partition coefficient of 4.0 between diethyl ether and water. Demonstrate that if 100mL of solution of 5.0g of A in water were extracted with two 25mL portion of diethyl ether, a smaller amount of A would remain in the water than if

    asked by Krystal on February 24, 2011
  22. Science

    A student collected nitrogen by displacing water in a graduated cylinder. the atmospheric pressure was 738.9 mmhg; the height of the water remaining in the cylinder was 13.2 mm; the partial pressure of the water was 18.8 mmhg. determine the partial

    asked by Mouna on November 11, 2018
  23. chemistry

    If a gram of water at sea level is heated from 37 degrees Celsius to 101 degrees. How much heat would be absorbed by the water?

    asked by john on November 20, 2011
  24. math

    a cylindrical tank with diameter 2.0m and height 3.2m is to be filled with water. how many litres of water are needed to fill the tank? 100cm3 = 1L

    asked by laf on January 13, 2013
  25. Maths

    Water from a tap flows into a bath at a rate of 750ml/s. How long does it take to fill a bath with 180 litre of water?

    asked by Junior on February 4, 2018
  26. chemistry

    Which of the following pairs of liquids are miscible in all proportions? Question 3 options: ethanol and oil ethanol and water gasoline and water All of the above

    asked by Clair on October 30, 2014
  27. Math -Calculus

    A cylinder with radius of 20 ft is being filled with water at a rate of 2000 ft^3/hour. Find the rate at which the height of the water is increasing.

    asked by Puja on November 19, 2012
  28. chemistry

    when it absorbed energy from a 79.4 g sample of water whose initial temperature was 70.1 °C. What is the specific heat of the metal in J/g·°C? How do i get the final temperature of water

    asked by lace on February 10, 2015
  29. Physics

    What would the gauge pressure be on a diver in atmospheres if she could dive to a depth of one km in sea water? One atmosphere is 1.01 X 10^5 N/m2. The density of sea water is 1.03 X 10^3 kg/m3.

    asked by Alex on November 30, 2010
  30. Chem Apps

    The solubility of sugar (surcose) in water is 4.0 g/mL at room temperature, what is the maximum amount of sugar that will dissolve in 850 mL of water?

    asked by Katie on January 21, 2010
  31. Geography

    What happens to temperature and precipitation as one moves inland and away from water bodies? I know that land heats and cools faster than water bodies.

    asked by Sara on February 17, 2011
  32. physics

    Water waves in a lake travel 5.23 m in 1.52 s. The period of oscillation is 0.84 s. What is the speed of the water waves? Answer in units of m/s. what is the wavelength?

    asked by josh on March 17, 2015
  33. Math

    The amount of water,V cm3 , in a leaking tank at time t seconds is given by V = (15-t)^3 for 0

    asked by Aaqib zaman on January 28, 2015
  34. chemistry

    dissolving 4.022 g of a salt in 100 mL of water changes temperature by -1.2^oC: what is the heat absorbed? The specific heat of water is 4.184 J/(g*C)

    asked by Bob on March 28, 2015
  35. college

    a 200 L electric water heater uses 15 kW of electric power. If the herter is 90% efficient, how long does it take to heat the water in the tank from 16 C to 61 C?

    asked by Bill on December 17, 2009
  36. Chemistry

    What volume of water would be required to dissolve 1 g of BaF2? mass of BaF2 is 1.31 g and it dissolves in 1 L of water. The answer is 0.763. Can someone please explain how they got this?

    asked by Kev on June 11, 2011
  37. Chemistry

    The following reaction represents the decomposition for water: 2H2O - 2H + O How many molecules of hydrogen are produced from the decomposition of 12.2 grams of water into its elements?

    asked by Stacey on March 25, 2010
  38. Environmental Science

    Earth's surface water is found in a.lakes b.rivers c.streams d.all of the above I picked d. because that's where SURFACE water is at right? yup ditto.....

    asked by Mack on April 20, 2007
  39. physics

    Suppose that it takes 10.0 h to drain a container of 5100 m3 of water. What is the "mass flow rate," in kilograms per second, of water from the container?

    asked by andre on August 26, 2011
  40. science

    Water is useful for reducing friction between objects. However you also learned that (due to friction) moving water causes rough rocks to become smooth. How can this be?

    asked by Caitlin on November 3, 2015
  41. Chemistry

    A 250 g sample of water with an initial temperature of 98.8 c loses 7,500 joules of heat. What is the final temperature of the water ?

    asked by Raul on October 3, 2015
  42. physics

    A person is standing at the edge of the water and looking out at the ocean. The height of the person's eyes above the water is h = 1.6m. and the radius of the earth is R = 6.38 X 10^6 m. (a) How far is it to the horizon?

    asked by linda on September 14, 2010
  43. chemistry

    If 1.20 grams of sodium metal are reacted with 4.00mL of water, how many grams of NaOH will be produced (density of water= 1.00g/mL)

    asked by Andy on September 21, 2009
  44. Chemistry

    The balanced equation for the synthesis of water is: 2H2 + O2 > 2H2O If I have 5.5 grams of water, at least how many grams of Oxygen gas was needed?

    asked by Erin on January 21, 2017
  45. chemistry

    How much heat energy is needed to change the temperature of 25.00 mL of water from 5.0°C to 75.0°C? The molar heat capacity of water for this process Cp = 75.38 J/(mol °C), d = 1.00 g/mL.

    asked by Anonymous on May 6, 2014
  46. Science

    A cicular pool with a radius oF 12 meter if filled with water to a depth of 3 meters. What is the weight of water in the swimming pool?

    asked by Kim on October 19, 2016
  47. Earth Science

    Please and Thank you. Mercury is 13.6 times more dense than water. If a container can hold 20g of water, how much more massive would an equal volume of mercury be?

    asked by Steve on September 29, 2010
  48. Chemistry

    How much heat in kJ is required to melt 54 grams of ice at 0 degrees C into water at 0 degrees C if delta Hvap for water = 6.01 kJ/mol?

    asked by Hannah on December 14, 2010
  49. Physics

    If an oil tank that if 15ft tall which is holding oil and water, the water being 8 ft, how much pressure will have when I is opened and begins to flow?

    asked by Melissa on November 28, 2014
  50. physics

    A diver achieves a horizontal velocity of 3.76 m/s from a diving platform located 6m above the water. How far from the edge will the diver be when she hits the water?

    asked by Rachel on October 5, 2014
  51. physics

    Water is lifted out of a well 38.0m deep by a motor rated at 1.00hp. assuming70% efficiency, how many kilograms of water can be lifted in 1 min?

    asked by bec on November 7, 2011
  52. chemistry

    The 17.35 g of NaCl sample was dissolv ed in an unknown amount of water. All we know is that prepared solution has 22.5% of NaCl . The mass of water is _____ g.

    asked by shawna on October 17, 2016
  53. math

    the building supply store sells one liter bottles of water for $1.09 approximately how many 8 ounce servings of water in 1 liter

    asked by chris on July 11, 2016
  54. General Science

    Would you expect to find more dissolved oxygen in ocean water around the North Pole or in ocean water nearer the equator?Why?

    asked by Jen on February 19, 2008
  55. science

    A certain mass of water gains 1,673 J of thermal energy when it's temperature increases by 2.0 degrees Celsius. What is the mass of the water?

    asked by Mary on November 10, 2014
  56. Sciene

    Mercury is 13.6 times more dense than water. If a container can hold 20g of water, how much more massive would an equal volume of mercury be?

    asked by Steve on September 29, 2010
  57. Math

    Hank's fish bowl holds 9/10 gallon of water. It is now 2/3 full. How much water is in the bowl? I subtracted and my answer is 7/30. Is this correct?

    asked by Alice on March 3, 2015
  58. calculus(work)

    a rectangular water tank has a length 20 ft, width 10 ft , and depth 15 ft . if the tank is full , how much work does it take to pump all the water out (using calculus)?

    asked by tony on April 2, 2011
  59. physics

    Water with a mass of 0.500 kg at 15.0 degree C is mixed with 0.800 kg of water at 35.0 degree C. What is the final temperature T_f of the mixture?

    asked by christy on April 3, 2012
  60. Physics

    Why is it that when water is in a bucket and spinning around in a circular motion and then upside down the water in the bucket does not move or spill? Am not sure on what terms to use to explain why this happens

    asked by Angie on November 4, 2009
  61. physics

    A fountain sends water to a height of 149 m. What is the difference between the pressure of the water just before it is released upward and the atmospheric pressure?

    asked by melisa on October 25, 2011
  62. Chemistry

    If all of the energy from a 60-watt bulb was put into 1 gram of water at room temperature for 2 seconds, how much would the temperature of the water increase?

    asked by Karmelo on December 8, 2010
  63. Physics

    A 755 N diver is standing on a platform 10.0 m above the surface of the water. What is the diver's speed when he hits the water? (disregard friction)

    asked by Einna on February 27, 2015
  64. physical science

    a ball dropped off a cliff and took 3.59s to fall to the water below. neglecting air resistance how far in meters did it fall how far is it down to water

    asked by lora on June 18, 2012
  65. Math

    Hi! You need 2 cups of water, but you only have a liquid measuring cup that measures up to 3 pints. what can you do to get the 2 cups of water that you need? explain and show your work.

    asked by Jessica L. on January 15, 2018
  66. Chemistry

    12.00 g of sugar is dissolved in some water in a cylinder of diameter 7.00 cm. To what height should the cylinder be filled (with more water) to produce a solution with concentration 11.00 g/dm^3?

    asked by Henry on January 20, 2011
  67. science

    an object was placed into a container of water. the arrow shows that thermal energy is flowing from the water to the object. what is a valid conclusion

    asked by Anonymous on February 4, 2015
  68. math

    A tank is full in 60 min with water.If amount of water is doble in 1min then in what time the half tank is fill.

    asked by Ple on February 9, 2016
  69. Chemistry

    If all of the energy from a 60-watt bulb was put into 1 gram of water at room temperature for 2 seconds, how much would the temperature of the water increase?

    asked by Karmelo on December 7, 2010
  70. Physics

    An outdoor swimming pool contains 100000 kilogram of water how much energy is needed yo heat water from 15 celius to 20 celius

    asked by Anonymous on March 2, 2015
  71. chemistry

    The compound sodium sulfate is soluble in water. When this compound dissolves in water, which ion listed below would be present in solution?

    asked by shanw on February 19, 2014
  72. Chem

    How much heat do I need to convert 200g of liquid water at -25C to water at 30C?. The specific heat capacity of H2O(s) is 2.1 J g*C

    asked by diana on February 28, 2011
  73. Algebra

    A tank contains 1200 litres . A tap is turned on and 40 litres of water escape each minute. How much water has escaped in 12 minutes.

    asked by Nic on August 27, 2014
  74. Science

    Julie dissolved 20 g of sugar in a cup of water. The mass of the solution was 500 g. What volume of water did Julie start with?

    asked by Anonymous on February 3, 2016
  75. Math

    write an inequality representing the temperature t of the ocean water during the formation of the hurricane if the ocean water is above 80 degrees farenheit

    asked by Angelina on March 9, 2015
  76. Physics

    A water tank is20m deep if the water barometer reads10m at that place then what is the pressure at the bottom of the tank in atmosphere

    asked by Vijay on November 23, 2016
  77. chemistry

    If the atmospheric pressure is not corrected for vapor pressure of water, what effect will this have on number of moles of oxygen calculated? Use numbers from your experiment and determine the percent deviation caused by this omission. Is this a

    asked by Anonymous on September 3, 2010
  78. physics

    Five identical resistors, each of resistance R, are connected in series to a battery, and a total current of 9.74 A flows in the circuit. i. Now, another resistor of resistance R is added to the circuit, in series with the rest of the resistors. Find the

    asked by kelly on October 8, 2014
  79. Physics

    A 50kg by runs up the steps to the third floor of height 10.5m in 45s.While at the third floor,the boy drops a 0.25kg ball and strike the ground 1)Calculate the rate of work done. 2)By using work-energy theorem,calculate the speed of the ball just before

    asked by Anonymous on October 3, 2017
  80. statistics

    In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. All lung cancer deaths were ascertained and the following data were available: • Fifteen (15) lung cancer deaths occurred

    asked by DANIELLE on April 10, 2008
  81. statistics

    In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. All lung cancer deaths were ascertained and the following data were available: Fifteen (15) lung cancer deaths occurred among

    asked by DANIELLE on April 10, 2008
  82. geometry.

    use midpoint formula to calculate the midpoint of AB. Name it point M and plot it in the graph. Calculate lengths AB, AM, MB. thanks for help.

    asked by robin on April 6, 2015
  83. chemistry

    % recovery: how do i calculate it? we're doing a recrystallization in chem class we used 0.1 g and we recovered 0.3 g how do i calculate the percent recovery?

    asked by jessie on February 9, 2011
  84. geometry

    In the following figure given a circle C(o,3) Bp=AB and BA^N = 30 a) Calculate AP,BN and AN b)Calculate AQ and BQ c) Show That M is the mid point of (AP) d)Show that (OM)is perpendicular to (A)

    asked by Nour on April 16, 2010
  85. Physical Science

    How do you calculate the mass and volume of an irregular solid object and calculate the density of that object?

    asked by Alex on January 25, 2009
  86. Math - Probability Statistics

    P(E)=.4, P(F)=.5 and P(E[intersect]F)=.1 , Calculate P(F|E)=? Using conditional probability, I got .2 as the answer, using: P(E[interstect F)/P(F) = .1/.5 = .2 Calculate P(E|F) is .25 using: P(E[intersect F)/P(E) = .1/.4 =.25 Is this now correct?

    asked by Dee on August 31, 2009
  87. Science

    1. Use the image below to answer the following question. An image shows a diver crouching on a diving board labeled 1. The diver launching off the board is labeled 2. The diver just about to enter the water is labeled 3 The diver in the water feet above

    asked by Luna on December 6, 2018
  88. Chemistry

    A 67gr mass of solid iron is heated by a flame until the temp of the iron equals the temp of the flame. The solid iron is then dropped into 250gr of liquid water at 26 degrees C. After 5 mins, the iron and the water are both at 47 degrees C. Specific heat:

    asked by Lacey on March 30, 2009
  89. chemistry - decomposition of water(help)

    Hydrogen is a very appealing fuel, in part because burning it produces only non-polluting water. One of the challenges that researchers face in making hydrogen fuel a reality is how to produce hydrogen economically. Researchers are investigating methods of

    asked by Farah on March 3, 2011
  90. chemistry - decomposition of water(help)

    Hydrogen is a very appealing fuel, in part because burning it produces only non-polluting water. One of the challenges that researchers face in making hydrogen fuel a reality is how to produce hydrogen economically. Researchers are investigating methods of

    asked by Farah on March 3, 2011
  91. Chemistry

    At 298 K, deltaGo = - 6.36 kJ for the reaction: 2N2O(g) + 3O2(g) ↔ 2N2O4(g) Calculate deltaG (in kJ) at 298 K when PN2O = 3.12 atm, PO2 = 0.0081 atm, and PN2O4= 0.515 Calculate deltaG (in kJ) at 298 K for some solid ZnF2, 0.025 M Zn2+ and 0.038 M F-(aq).

    asked by Anonymous on April 3, 2013
  92. Physics

    The archerfish hunts by dislodging an unsuspecting insect from its resting place with a stream of water expelled from the fish's mouth. Suppose the archerfish squirts water with a speed of 2.45 m/s at an angle of 53.0 degrees above the horizontal, and aims

    asked by Leah on September 15, 2009
  93. Chemistry

    So we're doing oxidation-reduction reactions and batteries and voltages. We did a lab where we would take two metals, put it in a mixture (bleach/water/vinegar/salt) and used a voltmeter to see the DC voltage. Now we're supposed to 'calculate the potential

    asked by Ari on May 5, 2013
  94. earth science

    Which item in the list below is most responsible for storm surge during a hurricane? A. Water mounding caused by a hurricane's low pressure center B. The strong horizontal surface winds in the hurricane push water ashore C. Heavy precipitation in the

    asked by Alz on October 1, 2018
  95. English

    Can you check these sentences about summer holidays? Thank you. 1) When I was at the seaside, I usually bathed twice in the mornings. (went for swims). 2) I pushed my child on a swing and I watch him going on a slide. When I was at the swimming pool, I

    asked by Henry2 on September 12, 2011
  96. physics

    a mercury column in a simple barometer at a height of 75.9cm. An amount of pure water is introduced into the barometer column and form a 1.20cm layer on top of mercury. The mercury column now stand at height of 78.08cm . what is the pressure in the space

    asked by temi on June 22, 2018
  97. College Chem

    A 1000 g sample of metal with a specific heat of 0.50 J/goC is heated to 100.0oC and then placed in a 50.0 g sample of water at 20.0oC. (Hint: Specific heat of water at 20.0oC is 4.182 J/goC). What is the final temperature of the metal and the water? Write

    asked by nia on February 17, 2017
  98. Physics

    i'm really lost here. please show me how to solve this A 0.10 kg piece of copper at an initial temperature of 94 degrees C is dropped into 0.20 kg of water contained in a 0.28 kg aluminum calorimeter. The water and calorimeter are initially at 15 degrees

    asked by teamjakeward on February 15, 2009
  99. Physics

    A hostess wants to cool her 100g of soup which is currently at 50Celsius, and it's specific heat is 0.8 cal/g celsius, by adding water (specific heat = 1 cal/ g celsius) at a temperature of 5Celsius, how much water should she add, assuming that all the

    asked by Mad on March 2, 2016
  100. Physics

    1. Calculate the kinetic energy of a 5.2kg object moving at 2.4 m/s 7. Calculate the potential energy of a 5.2kg object positioned 5.8m above the ground 21. Calculate the speed of a 5.2 kg object that possesses 26.1 J of kinetic energy.

    asked by Mary on February 12, 2017