1. Physics

    A solar still is used to make fresh water from salt water by evaporation. Assume that during a summer day that 1000 BTU/ft sq of solar energy falls on the surface of the salt water. Determine how many inches of water are evaporated in 30 days. Assume that
  2. Physics

    A solar still is used to make fresh water from salt water by evaporation. Assume that during a summer day that 1000 BTU/ft sq of solar energy falls on the surface of the salt water. Determine how many inches of water are evaporated in 30 days. Assume that
  3. Chemistry

    Is dissolving salt in water an example of reversible? I don't think so because once salt is in water, the water is not clear anymore. Pls help. thanks. Yes, it is reversible. One ca physically separate the salt and water (evaporation) What do you mean by
  4. science-plz help this is so urgent!

    8. a) after the oceans, where is the next largest reserve of water found? b) does this reserve contain salt water or fresh water? Fresh water lakes on the surface. Glaciers and icecaps account for a greater amount of water than lakes swamps and rivers if
  5. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a
  6. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a
  7. Phyics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a
  8. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a
  9. physics

    This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If
  10. physics

    This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If
  11. physics

    This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If
  12. ELA

    can you proof read When we turn on the top,we expect an abundant supply of clean, fresh water to flow out. Having one of the world's largest supplies of fresh water, these expectations may usually be met in Canada . However,in many other countries, water
  13. Chemistry

    How might one separate a mixture of water and salt? A solution of water and salt may be separated, if you don't want the water, by allowing the water to evaporate which will leave the salt crystals behind. If you want the water AND the salt, you may
  14. 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.
  15. Solar Energy Please Help

    a) Family Smith has already installed PV in their house. Now, they also want to cover their needs for warm water with solar energy. For this, they consider having a solar thermal water heating system. Considering that the need for warm water is 100L/day,
  16. Physics

    a) Family Smith has already installed PV in their house. Now, they also want to cover their needs for warm water with solar energy. For this, they consider having a solar thermal water heating system. Considering that the need for warm water is 100L/day,
  17. Math

    Nia and Trey both had a sore throat so their mom told them o gargle with warm salt water. -Nia mixed 12 teaspoon salt with 3 cups of water. -Trey mixed 12 teaspoons salt with 112 cups of water. Nia tasted Trey's salt water.She said," I added more salt so I
  18. CHEMISTRY

    45) George is making spaghetti for dinner. He places 4.01 kg of water in a pan and brings it to a boil. Before adding the pasta, he adds 58 g of table salt to the water and again brings it to a boil. The temperature of the salty, boiling water is _ _ _ _
  19. science

    Which of the following is a example of a irriversible change. a)Disssolve salt in water b)Freezing water C)Mixing water-colour Which do you think you can't separate? Can you separate salt after it is dissolved in water? I think I could evaporate the water
  20. science

    Three equal-sized pans containing distilled (pure water),ocean water (3 percent salt),and water from the Great Salt Lake in Utah (about 20 percent salt)are placed in freezer. Which of the following would be the order in which these three liquids would
  21. science

    The average solar radiation incident on the surface of the earth is about 1 KW/m2 for the entire year. A solar house is built with solar panels installed in the roof to provide the heating and electrical energy of the house. If the roof has a surface area
  22. science

    Does water with salt boils faster than plain water Yes, salt increases the waters boiling point and therefore a higher temperature is needed for the water to boil. Salt does, indeed, increase the boiling point of water due to the salt but it will take
  23. college earth science and astronomy

    This isn't homework as much as I am trying to learn this on my own. I am trying to perform an experiment on solar power. I measured and recorded the volume (V= 250 mL) and mass (M= 250 g) of water in a cup. I then recorded the initial temperature(32
  24. Science question

    Will the evaporation of ocean water at the equator cause the ocean water to become more or less salty, why? Wouldn't it be because it evaporates, it will be more salty cause the fresh water is evaporating and the salt is left behind? Thanks -Allyson
  25. Science 6TH Grade

    Salim added 1 g of salt to each of four beakers filled with water. He stirred the water at different speeds, and recorded how long it took for the salt to dissolved. Stirring - Time (sec) No stirring - 25 Slow stirring - 18 Medium stirring - 10 Fast
  26. Chemistry

    A metal, M, of atomic weight 96 u reacts with fluorine to form a salt that can be represented as MFx. In order to determine x and therefore the formula of the salt, a boiling point elevation experiment is performed. A 10.9 g sample of the salt is dissolved
  27. Science

    Salim added 1 g of salt to each of four beakers filled with water. He stirred the water at different speeds, and recorded how long it took for the salt to dissolved. Stirring - Time (sec) No stirring - 25 Slow stirring - 18 Medium stirring - 10 Fast
  28. Science

    Salim added 1 g of salt to each of four beakers filled with water. He stirred the water at different speeds, and recorded how long it took for the salt to dissolved. Stirring Time (sec) No stirring 25 Slow stirring 18 Medium stirring 10 Fast stirring 6
  29. Algebra 1

    Thank you in advance for your kind help! How much fresh water should be mixed to a 30% salt water solution, to obtain 90 gallons of a 23% salt water solution?
  30. Algebra 1

    Thank you in advance for your kind help! How much fresh water should be mixed to a 30% salt water solution, to obtain 90 gallons of a 23% salt water solution?
  31. science

    this is a follow up question from my last one with the exact question If you dissolve 200 g of salt in 20 l of water, what is the density of that solution of salty water? Hint: In this particular example, assume that the total volume doesn’t change when
  32. Chemistry

    Explain why iron corrodes more quickly in seawater than in freshwater. I'm getting conflicting answers from searching on Google; is it because the corrosion of iron is a redox reaction, which involves a transfer of electrons, and therefore this transfer of
  33. physics

    A boat floating in fresh water displaces water weighing 35.6 kN. (a) What is the weight of the water this boat displaces when floating in salt water of density 1.10 x 10^3 kg/m^3? (b) What is the difference between the volume of fresh water displaced and
  34. Environmental Sciencee

    2. The water resources of the Earth are located in a. salt water fround in the ocean b. fresh water found in icecaps and glaciers c. fresh water found in rivers, lakes, and streams d. all of the above D
  35. chem

    What advantage is there to adding salt to cooking water? and what conditions are necessary for ideal carbonation of a beverage? please help http://www.miniscience.com/projects/Saltwater/index.html http://www.physlink.com/Education/askExperts/ae643.cfm
  36. Physics

    A ship sailing through the St. Lawrence River (fresh water) enters the Atlantic Ocean (salt water). At equilibrium the ship will sit {higher or lower} in the Atlantic Ocean (salt water) compared to the St. Lawrence River (fresh water).
  37. Physics

    Salt water is poured into a U tube until it stands 0.250 m high in each arm. Oil is then added slowly to one arm until the salt water in the other arm stands 0.300 m high. The free surface of the oil then stands at 0.321 m high. (the weight density of the
  38. science

    Erin must perform a science experiment. She needs to dissolve 10 g of salt in 250 ml of water. She measures the water incorrectly and dissolves the 10 g of salt in 350 ml of water. Now she has no more salt. Explain what Erin can do to make the solution
  39. SCIENCE!

    the second worksheet of SCIENCE! for today performing an experiment read the following statements and then answer the questions. 1. a scientist wants to find out why sea water freezes at a lower temperature than fresh water. 2. the scientist goes to the
  40. biology help please :)

    Olga's teacher asked her to design an experiment using freshwater plants, fish bowls, tap water, and salt. After determining an approach, Olga placed a plant in each of three fish bowls. Then, she filled one bowl with fresh water, one bowl with dilute salt
  41. Pre-Algebra

    There are about 3x10^20 gallons of salt water on the earth, while there are about 6x10^18 gallons of fresh water. About how many times the amount of fresh water is the amount of salt water? A. 2 TIMES B. 50 TIMES C. 200 TIMES D. 500 TIMES
  42. Earth Science

    1. The water cycle is the _____. A. distribution of drinking water on Earth ?**? B. unending circulation of Earth's water supply ?**? C. the recycling of water after industrial use ?**? D. the evaporation of water from Earth's surface ?**? 2. Plants
  43. physics

    At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24-hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar
  44. physics help

    At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24-hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar
  45. Chemistry

    What happens to the sample's reported water content if the salt decomposes yielding a volatile product? If the water is not completely removed from the salt during the heating process, will the reported water-to-salt mole ratio be high or low? Explain
  46. Science

    If I want to make a solution that has a 5% concentration of salt, is it correct for me to have 380mL water and 20g salt? My method behind this was that I wanted a 400g solution, and so since 1mL water is equal to 1g water, I did: 400x0.95=380g water or
  47. Chemisty

    A certain salt is known to have a solubility in water of 25.2g/100g water at 100°C and 11.4g/100g water at 20°C. The salt is dissolved in 240 g of water at 100°C until no more solid will dissolve. How much salt will crystallize out when the solution is
  48. science

    what is the concentration of a solution made by mixing 22.0 g of salt with 200 mL of water? assume that the volume of the water does not change when the salt is added
  49. Calc

    You are a lab technician and must create 250 ml of a 17% salt-solution. a. If you have 500 ml of 28% salt-solution, how many milliliters of it should you mix with water in order to create 250 ml of a 17% salt-solution? b. If you have 400 ml of 40%
  50. math

    You are a lab technician and must create 250 ml of a 17% salt-solution. a. If you have 500 ml of 28% salt-solution, how many milliliters of it should you mix with water in order to create 250 ml of a 17% salt-solution? b. If you have 400 ml of 40%
  51. Science

    If I mixed sugar and sand into the water,what would happen? The sugar would ___, and the sand would ___ dissolve;not dissolve Name 3 examples of a mixture sand and water powder and water marbles and paperclips When I mix salt and water together and the let
  52. Science

    Table salt has a solubility of 36 g of salt in 100 g of water at 40°C. If 15 g of the salt are added to 50 g of water at the same temperature, is the resulting solution saturated or unsaturated? Explain your answer
  53. science

    Table salt has a solubility of 36 g of salt in 100 g of water at 40°C. If 15 g of the salt are added to 50 g of water at the same temperature, is the resulting solution saturated or unsaturated? Explain your answer.
  54. 3rd homework

    the water cycle! lesson I water on earth type of water 1. ? where found 2. ? 3 ? 4 ? uses 5. ? 6. ? 7. ? 8. ? where found 9. ? 10. ? 11. ? uses 12. ? 13. ? 14. ? 15. where salt and fresh water meet is called an ? please help with the ?'s. I have no idea
  55. Material balance

    A dilute salt solution containing 6% salt is fed to an evaporator at rate of 10000 kg/h for a trail run. crystals formed along with the saturated solution adhering with them are sent to a centrifuge for the recovery of the solution. 60% of the adhering
  56. chemistry

    A competing technology uses a photovoltaic cell to charge a battery which can then be used to power a LED light. To compare these technologies, we make some reasonable assumptions. We assume the solar cell is 10 cm on a side, and that it has an efficiency
  57. calculus

    A competing technology uses a photovoltaic cell to charge a battery which can then be used to power a LED light. To compare these technologies, we make some reasonable assumptions. We assume the solar cell is 10 cm on a side, and that it has an efficiency
  58. CHEM

    A metal, M, of atomic mass 91 amu reacts with fluorine to form a salt that can be represented as MFx. In order to determine x and therefore the formula of the salt, a boiling point elevation experiment is performed. A 9.05-g sample of the salt is dissolved
  59. 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
  60. Math

    In a certain coastal basin, the sea water contains 3.5 grams of salt per 1000 milliliters of water. How many grams of salt would be in 2 liters of the sea water.
  61. Science

    Which of the following contain water that is easily available for human use? (more than one answer) Icecaps & glaciers - 76% of fresh water Shallow Groundwater- 12% of fresh water Deep Groundwater - 11% of fresh water Lakes & Rivers - 0.34% of fresh water
  62. 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
  63. chemistry

    You weigh an empty dish and find its mass to be 48.0 grams. After you add a volume of salt water to the dish the mass of the dish and salt water is now 74.0 grams. After 100% of the water has been evaporated, the mass of the dish and the remaining salt is
  64. chemistry

    What would be the best technique to separate a soluble solid from a solution, like separating salt from a mixture of salt water? filtration chromatography electrolysis evaporation
  65. Chemistry 1046

    A metal, M, of atomic mass 91 amu reacts with fluorine to form a salt that can be represented as MFx. In order to determine x and therefore the formula of the salt, a boiling point elevation experiment is performed. A 9.05-g sample of the salt is dissolved
  66. Science

    Table salt has a solubility of 36g of salt in 100g of water at 40 degrees celcius. If 15g of salt is added to 50g of water at the same room temperature, is the resulting solution saturated of unsaterated? Explain your answer.
  67. Physics

    What are the independent and dependent variables in the following scientific investigation? Controlled variables are also being used in this investigation. Identify the controlled variables as well. A chemistry student is conducting an experiment to
  68. physics

    A water is operated by solar power. If the solar collector has an area of 5.25m2, and the intensity delivered by sunlight is 475W/m2, how long does it take to increase the temperature of .600m3 of water from 20.C to 85.0C?
  69. Science (weather & climate) -

    I just wanted to post this question once more. I have to go offline soon. Please go over my answers. Thanks True or false: 7.Eruptions fom volcanoes decrease global temperatures. I answered false because volcanes spew out CO2 into the atmophere. The
  70. termodynamic/phsics

    What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If there is a water flow of 500 g / minute to a solar panel on one m2, how much water is heated up under optimal conditions during
  71. Physics

    A water heater is operated by solar power. If solar collector has an area of 6.00m^2, and the intensity delivered by sunlight is 550W/m^2, how long does it take to increase the temperature of 1m^3 of water from 20°Cto 60°C?
  72. chemistry

    The use of the British thermal unit (Btu {\rm Btu}) is common in much engineering work. (1 Btu {\rm Btu} = 1054J {\rm J}) A Btu {\rm Btu} is the amount of heat required to raise the temperature of 1 lb {\rm lb} of water by 1 ∘ F ^\circ {\rm F}. How
  73. someones GOTTA help me with this science...!!!

    1. Which of the following describes the correct sequence of events during the water cycle? (1 point)precipitation ¨ condensation ¨ evaporation ¨ runoff condensation ¨ precipitation ¨ runoff ¨ evaporation runoff ¨ condensation ¨
  74. Science :(

    Which of the following describes the correct sequence of events during the water cycle? precipitation → condensation → evaporation → runoff condensation → precipitation → runoff → evaporation runoff → condensation
  75. Science

    Where is most of the surface water on earth found? a) as freshwater in rivers b) as frozen water near the pole c) as groundwater under the surface d) as salt water in oceans I think its either A or D. Am I correct?
  76. Science

    Which of the following solutions would have the highest boiling point? (1) 5 liters of water (2) 5 grams of salt dissolved in 4 liters of water (3) 10 grams of salt dissolved in 3 liters of water (4) 15 grams of salt dissolved in 2 liters water (5) 20
  77. science

    When substances such as sugar and table salt are dissolved in water, the freezing points of the new solutions are lower than the freezing point of water. Also, the more material dissolved, the lower the freezing point. The boiling points of these
  78. science

    which of the following is the best reason salt is sometimes spread on icy highways? 1) when a car drives on the ice, the firstion created between the salt and the ice produces heat that melts the ice. 2)when salt chemically reacts with the water, the heat
  79. physics

    (a) A solar collector is 12.0% efficient in gathering solar energy and converting it to heat. If the average intensity of sunlight on one day is 700 W/m2, what area(m^2) should your collector have to gather energy at the rate of 150 W? (b) What is the
  80. science

    how are ammonia, salt and water alike? how is salt different from glucose, salt and water?
  81. solar thermal

    how many btu's in 350 gal of water at both 80 &240 degrees
  82. SCI 275

    Identify 3 fresh water and salt water resource issues
  83. science

    When substances such as sugar and table salt are dissolved in water, the freezing points of the new solutions are lower than the freezing point of water. Also, the more material dissolved, the lower the freezing point. The boiling points of these
  84. Science

    Can a barge carry a heavier load without sinking in fresh water or salt water
  85. science

    When substances such as sugar and table salt are dissolved in water, the freezing points of the new solutions are lower than the freezing point of water. Also, the more material dissolved, the lower the freezing point. The boiling points of these
  86. Science - Climate change

    This is from my textbook, about sea breeze. "A water breeze occurs during the day when the solar energy warms up the land faster than the nearby water. Remember that water is a better heat sink than land, and so can absorb a lot of energy without getting
  87. college

    A tank for storing water is conical in shape, with maximum radius 20 m and maxi­mum depth 15 m. The large, circular end of the tank points vertically upwards and is open to the air. It is known that the volume of water in the tank will decrease at a rate
  88. Science:Earth Science

    Explain how energy conservation can help with decreasing air, water and land pollution. This is an essay question. This is my answer. Answer: Energy conservation can help with decreasing air, water, and land pollution because of the different alternatives
  89. physics

    If a bowl of salt water is left in the sun long enough for the water to evaporate a layer of salt crystals will be left in the bottom of the bowl. Salt crystals are more ordered than dissolved ions. How does the increase or decrease in entropy relate to
  90. algebra

    In a cetain year, solar and wind energy generation totaled 1034 trillion Btu's. Wind generated 53 trillion Btu's more than eight times that generated by solar energy. How much was generated by each source?
  91. math

    You have an aquarium for your new pet, “Shamu” the killer whale, that contains 100,000 pounds of ocean water with a salinity of 30 o/oo. a. Calculate how many pounds of salt are currently in the aquarium. b. You think Shamu may be allergic to salt, so
  92. Science

    I can live in both fresh water and salt water. When full grown, I migrate long distaces to my place of birth. What am I?
  93. Science

    What is the percent of fresh water and salt water?
  94. Science

    What is more dense, fresh water or salt water and how do you know?
  95. chemistry

    A solar heating specialist is considering paraffin as a possible solar heat collector. How many kilograms of paraffin would be needed to collect as much energy as 4.73 x 10^3 kg of water? The specific heat of paraffin is 2.90J/gxC. Hint: Assume the same
  96. chemistry

    A solar heating specialist is considering paraffin as a possible solar heat collector. How many kilograms of paraffin would be needed to collect as much energy as 4.73 x 10^3 kg of water? The specific heat of paraffin is 2.90J/gxC. Hint: Assume the same
  97. physics

    A hot-water heater is operated by solar power. If the solar collector has an area of 5.8 m2 and the power delivered by sunlight is 550 W/m2, how long will it take to increase the temperature of 1.0 m3 of water from 24°C to 59°C?
  98. Maths

    A solar heater with a collector area of 58.0 m2 is required to heat 2560 kg of water. Under the same conditions, how much water can be heated by a rectangular solar collector 9.50 m by 8.75 m?
  99. Science

    Which of the following is a problem with using solar power as a main source of energy? A. People do not yet have the technology to use solar power*** B. The sun is not close enough to provide solar energy C. Power from solar energy contains a large amount
  100. chemistry

    A 2.500×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3mL . The