1. physics

    An ideal gas is confined to a container with adjustable volume. The pressure and mole number are constant. By what factor will volume change if absolute temperature doubles

    asked by joyce on July 14, 2011
  2. CHEM

    Calculate the mass of nitrogen dissolved at room temperature in an 80L home aquarium. Assume total pressure of 1 atm and mole fraction of .78 for nitrogen

    asked by Johannie on September 19, 2010
  3. Chemistry

    Calculate the mass of nitrogen dissolved at room temperature in an 80L home aquarium. Assume total pressure of 1 atm and mole fraction of .78 for nitrogen

    asked by Johannie on September 19, 2010
  4. Physics

    Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?

    asked by Leila on April 23, 2012
  5. Chemistry

    A 237 g piece of molybdenum, initially at 100.0°C, is dropped into 244 g of water at 10.0°C. When the system comes to thermal equilibrium, the temperature is 15.3°C. What is the specific heat capacity of molybdenum?

    asked by Lindy on April 22, 2011
  6. Chemistry

    how many molecules of sulphuric acid is needed to neutralize 5ml of potassium bicarbonate (iv)acid when calcium is heated at temperature 200 calcius using nickel as catalyst

    asked by Joshua on January 6, 2018
  7. Physics

    4 kg of lead shot at 91.1o C are poured into 4 kg of water at 29.5o C. Find the final temperature (in oC) of the mixture. Use cwater = 4187 J/kg oC and clead = 128 J/kg oC. Please i need the answer and equation used to solve for the answer Thanks!

    asked by Jake on February 7, 2019
  8. CHEMISTRY URGENT!

    a sample of oxygen that occupies 1.00 x 10^6mL at 575mmHg is subjected to a pressure of 1025atm. what will the final volume of the sample be if the temperature is held constant? how do uu set up the equation

    asked by kacie on February 3, 2013
  9. Chemistry - Final Temperature

    An unknown mass of each of the following substances, initially at 23.0C, absorbs 1910 J of heat. The final temperature is recorded as indicated. Find the mass of each substance. sand (Tf=62.0C) ethanol (Tf=44.1C) water (Tf=32.1C)

    asked by Amy on October 28, 2012
  10. physics

    a .250kg block of aluminum is heated to 100 C and then dropped into .60 kg of water that is initially at 20C. What is the equilibrium temperature of the system? The specific heat of aluminum is .22 kcal/kg C

    asked by Anonymous on February 17, 2011
  11. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 10, 2013
  12. Science

    Scientist study many factors that allow them to predict weather. Which factor most directly affects the movement of air? a) air pressure; b) precipitation; c) relative humidity; d) temperature

    asked by Miliano on February 21, 2012
  13. Chemistry(Please help, thank you!)

    How would I find the molality of NaCl with the following information? initial temperature= 98degrees celsius final temp=100 degrees celsius. Kbp(water)=0.512

    asked by Hannah on February 19, 2012
  14. Chemistry

    A container initially has 0.0186 M ammonia at a certain temperature. When the system reaches equilibrium the concentration of ammonia is 0.0035 M. Calculate Kc for the following reaction as written. N2(g) + 3H2(g) --> 2NH3(g)

    asked by Dan on November 3, 2007
  15. physics103

    an ideal gas at 17•c has a pressure of 760 mmHg and is compressed adiabatically until its volume is halved.Calculate final temperature of the gas assuming Cp= 2100 J/kg/K and Cv=1500J/kg/K

    asked by lesar on April 21, 2016
  16. science

    Assuming that the cylinder is fixed at both ends and that its wall thickness is 7.5 mm, what force would be exerted by the cylinder during this change in temperature? (Note: the Young’s modulus for aluminium is 70 GPa.)

    asked by emy on July 5, 2012
  17. CHEMESTRY

    A 265 ML ROUND-BOTTOMED FLASK CONTAINING 0.650G OF A GAS WAS COLLECTED AT A TEMPERATURE OF 25.0 CELECIUS AND 735 TORR PRESURE.CALCULATE THE MOLAR MASS OF THIS GAS

    asked by MARI on December 6, 2016
  18. chemistry

    Benzene has a heat of vaporization of 30.72kJ/mol and a normal boiling point of 80.1 degrees C. At what temperature does benzene boil when the external pressure is 470 torr?

    asked by Erin on September 7, 2008
  19. physics

    A solar heating panel on a roof is used to heat 40 kg of water initially at 22 degress celsius, using the sun, which absorbs 750 joules per second. What would the temperature of this water be after 1 hour?

    asked by Ryan on March 3, 2012
  20. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 11, 2013
  21. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 12, 2013
  22. chmistry

    A 4.98 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/°C. If the temperature rose from 29.5°C to 69.8°C, determine the value of ΔH°comb for aniline.

    asked by love on June 18, 2013
  23. organic chemistry

    Why is steam distillation rather than a simple distillation used to isolate eugenol? My answer is because the temperature goes nowhere near their boiling points, which minimises the risk of decompostion. Is it that right? If not then don't you mind if you

    asked by Ashley on September 26, 2012
  24. Chemistry

    Suppose the atmospheric pressure during the experiment was 751 mmHg. The temperature of the water was found to be 23.0 degrees celsius. What is the pressure of the oxygen gas, Po2 that is produced?

    asked by Casey on September 27, 2012
  25. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 10, 2013
  26. phy113

    An ungraduated mercury thermometer attached to a millimeter scale reads 22.8 mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is. 20oC?

    asked by sam on March 26, 2014
  27. Astronomy

    Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?

    asked by Leila on April 23, 2012
  28. quim

    A 453 K and 755 mm Hg , what volume of N2 completely react with 22.2 L H2 to produce NH3 ? N2 ( g ) + 3 H2 ( g ) -> 2 NH3 ( g ) I doubt if I use the ideal gas formula PV = nRT or another , but having only a pressure and a temperature which is not used

    asked by Marie on April 11, 2016
  29. chemistry

    Assuming the temperature and pressure are held constant, which of the gas samples has the greatest number of gas particles? Answer 45.0 mL O3 35.0 mL N2 15.0 mL of CO2 25.0 mL of SO3 how would i go about answering this question.

    asked by jakey on January 19, 2013
  30. physics

    If a container holds 0.865 L of ethyl alcohol at 12.0 degree{C}}, what is the volume of the alcohol when its temperature is raised to 35.0 degrees celcius? i was thinking it was VT=VT and sub in but keep coming out with wrong answer

    asked by please help on January 8, 2012
  31. Chemistry

    Calculate the number of molecules in a deep breath of air whose volume is 2.25L at body temperature, 37 Celsius, and a pressure of 735 torr. Answer is 5.15 x 10^22 molecules. Help me!

    asked by Fred on January 18, 2018
  32. chemistry

    A sample of oxygen that occupies 1.00x10^6 mL at 575 mm Hg is subjected to a pressure of 1.36 atm. What will the final volume of the sample be if the temperature is held constant? How would I set up this equation?

    asked by kate on March 4, 2013
  33. science

    From the cosmic background radiation, what can scientists infer that the universe was like after the big bang? A. Very small B. Hot C. The same average temperature as it is today. D. Cooler than it is today. Is the answer C? Thank you for the help😊

    asked by Kanani on April 9, 2015
  34. Intro to Chemistry

    A substance X has the density of 0.359 g/mL at room temperature. What is the volume in mL of 25.0 g of the substance? Show calculation. -------------------------------------- I tried to cross multiply but I dunno...I'm getting some pretty crazy numbers.

    asked by chrisalis on January 6, 2008
  35. Physics

    An ideal gas was slowly compressed at constant temperature to one-half it’s original volume. In the process, 150 kcal of heat was given off. How much work was done by the gas (in joules)?

    asked by Austin on February 19, 2019
  36. Earth Science

    Unlike most road maps, topographic maps can be used to find 1: the best route to a town 20 km away. 2: the temperature at any place on the map 3:the elevation above sea level. 4:the distance between two locations

    asked by Kelly on October 7, 2014
  37. phy

    an ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20

    asked by kate on July 2, 2013
  38. Astronomy

    A newly discovered planet has a surface temperature of 330 K and a density of 6 g/cm3. What minimum radius does the planet need to have in order to hold water in its atmosphere indefinitely? (in km)

    asked by qwerty on March 4, 2014
  39. math probability

    Daytime high temperatures in New York in February are normally distributed with an average of 30.2º and a standard deviation of 8.5º. Estimate the probability that the temperature on a given day in February is 39º or higher.

    asked by Jamar on March 4, 2014
  40. chemistry

    A 150.0 mL flask contains 0.391 grams of a volatile oxide of sulfur. The pressure in the flask is 750 mmHg and the temperature is 22C. Is the gas SO2 or SO3?

    asked by Rachel on March 14, 2011
  41. physics

    Suppose that the pressure of an ideal gas mixture remains constant at 1700 Pa (1 Pa = 1 N/m2) and the temperature is increased from 400K to 800K. How much work does the gas do to the surroundings during expansion?

    asked by Angela on March 1, 2013
  42. Chemistry

    How would I find the molality of NaCl with the following information? initial temperature= 98degrees celsius final temp=100 degrees celsius. Kbp(water)=0.512

    asked by Hannah on February 13, 2012
  43. Chemistry

    2C6H6(l) + 15O2(g) -> 12CO2(g) + 6H2O(l) + 6542 kJ If the heat from burning 7.000 g of C6H6 is added to 5691 g of water at 21 degrees C what is the final temperature of the water?

    asked by David on February 10, 2012
  44. Math

    This is a continuation of a math problem I posted earlier. I'm a little confused by this question. From your equation, when during the day would the temperature be 30C? (2 marks) The equation I obtained was: T(t) = 5.9 sin( πt/12 + 7π/6 ) + 27 Any help

    asked by Anonymous on January 14, 2013
  45. physics

    A house with a room wall of 5m by 3m is build of bricks of 20 cm. if internal temperature is 21 degrees celcius and those outside -18 degres celcius; what is the amount of heat flow if thermal conductivity is 0.63

    asked by Anonymous on March 27, 2016
  46. chemistry

    In the laboratory a student finds that it takes 20.7 Joules to increase the temperature of 11.0 grams of solid platinum from 20.5 to 35.8 degrees Celsius. What is the specific heat of platinum she has measured.

    asked by grace on March 11, 2014
  47. Chemistry

    A 30.0 gram sample of water at 280. K is mixed with 50.0 grams of water at 330. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.

    asked by Anonymous on October 12, 2010
  48. Math

    19. WorkPad Note: In questions 19-21, remember to show all of the steps that you use to solve the problem. Be sure to use the text box where the question mark (?) first appears to show your mathematical work. You can use the comments field to explain your

    asked by YRN DJ on December 17, 2015
  49. AP CHEM

    help please. i don't even know where to start An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has been filled with nitrogen gas at a pressure of 790. torr and a temperature of 15?C. When the container is evacuated and

    asked by Nikki on January 23, 2008
  50. trig

    A tree growing on a hillside casts a 121-foot shadow straight down the hill. Find the height of the tree (in feet) if the slope of the hill is 8 degrees and the angle of elevation of the sun from the horizontal is 50degrees.

    asked by joey on November 5, 2012
  51. Algebra 2 URGENT

    Solve the problem. Round answer to the nearest hundredth. Please Show All Work! Suppose a pool has dimensions 12 ft. by 30 ft. A sidewalk of uniform width around the pool has an area of 200 square feet. What is the width of the walkway?

    asked by Trisan on November 18, 2009
  52. physics

    A high diver of mass 50.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. If her downward motion is stopped 2.10 s after her feet first touch the water, what average upward force did the water exert on her?

    asked by yeen on September 21, 2012
  53. Math

    A container needs to package hazardous chemicals in a special plastic rectangular prism that holds 80 cubic feet. Find the whole number dimensions of the container that would use the least amount of plastic. My answer is 5ft, 2ft, and 4ft

    asked by Americal on February 21, 2014
  54. Math

    I am in third grade and have a word problem that I don't understand. There is a picture of a retangular window with 12 little squares inside divided by wood. The question is how many feet of lights would be needed to hang around five windows like this one.

    asked by Deborah on April 9, 2013
  55. Physics

    You step onto a hot beach with your bare feet. A nerve impulse, generated in your foot, travels through your nervous system at an average speed of 152 m/s. How much time does it take for the impulse, which travels a distance of 1.65 m, to reach your brain?

    asked by Sherlie on September 25, 2016
  56. Algebra 1

    At takeoff, a plan flies at an angle of 10 debrees with the runway. After it has traveled a ground distance of 2,800 feet, find the vertical distance the plane has gained from takeoff. Round your answer to the nearest foot

    asked by Brian on May 10, 2012
  57. algebra 1

    Charles wants to build a vegetable garden such that three sides of the garden are fenced and the fourth side of the garden will be the existing back fence. He has 30 feet of fencing available. Find the dimensions of the garden that will produce the maximum

    asked by sridhar on September 13, 2009
  58. precalc

    Old McDonald has 1000 feet of fencing, and wants to build a pen along the side of his barn that will have two separate areas- one for his pigs, and one for his cows. if only one of the fences is to run parallel to the barn, find the dimensions of the pen

    asked by adina on September 19, 2013
  59. Math

    Average height of a species of tree (in feet) after a certain number of years Years----------Height 1 ------------- 2.1 2 ------------- 3.2 3 ------------- 6.8 4 ------------- 7.3 5 ------------- 11.2 6 ------------- 12.6 7 ------------- 13.4 8

    asked by Kaai97 on December 14, 2015
  60. college physics

    You step onto a hot beach with your bare feet. A nerve impulse, generated in your foot, travels through your nervous system at an average speed of 124 m/s. How much time does it take for the impulse, which travels a distance of 1.60 m, to reach your brain?

    asked by jess on September 13, 2015
  61. Physics

    You step onto a hot beach with your bare feet. A nerve impulse, generated in your foot, travels through your nervous system at an average speed of 113 m/s. How much time does it take for the impulse, which travels a distance of 1.50 m, to reach your brain?

    asked by Amanda on September 26, 2010
  62. Physics--Newtons Second Law

    A high diver of mass 60.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. If her downward motion is stopped 1.80 s after her feet first touch the water, what average upward force did the water exert on her?

    asked by Anonymous on March 4, 2012
  63. Al;gebra 1

    1) A family is building a patio onto the back of their house with a rectangular area in the center and equal square sections on both sides. The entire length of the patio can be no longer than 20 feet. Let p represent the width of each square section.

    asked by Gwenq on November 13, 2015
  64. Trigonometry

    The Chrysler Building casts a shadow approximately 130 feet long on the street when the Sun's rays form an 82.9 angle with the Earth. Approximately how tall is the building? Round you answer to four decimal places.

    asked by Lauren on November 28, 2010
  65. math

    Suppose you drop a ball from the top of a five-story building onto the sidewalk 70 feet below. a. What is the initial velocity of the ball? b.Determine a function for the height of the ball t seconds after it's released. c. How long will the ball be in the

    asked by Sally on October 13, 2010
  66. Physics

    We discussed in lectures that traveling Electromagnetic waves in vacuum of the form E⃗ =E0xˆcos(kz−ωt),B⃗ =B0yˆcos(kz−ωt) satisfy all 4 Maxwell's equations. In lectures, I showed that an application of the generalized Ampere's Law (closed loop

    asked by Anonymous on May 11, 2013
  67. English

    Swimming Strokes by Lee Carroll Paragraph 3: The second type of stroke-the breast strok-is my favorite, since it feels the most natural. Here the kick became very important. In the past, the frog kick was popular, but today this had been largely supplanted

    asked by katelyn on March 23, 2011
  68. Physical Science

    What is the relationship between the temperature of a star and the spectrum of the star?

    asked by Angie on May 1, 2017
  69. chemistry

    What are standard temperature and pressure? Why was a standard needed?

    asked by Joseph on October 2, 2013
  70. math

    It is 25 degrees outside.The temperature drops 30 degrees what is the temperture now.

    asked by daivid on August 27, 2013
  71. chemistry

    Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = 23.0 kJ, ΔS = 125 J/K, and temperature = 85.0 C.

    asked by danny on February 5, 2015
  72. Physics

    An infinite straight wire carrying a current I=5 A flowing to the right is placed above a rectangular loop of wire with width w=11 cm and length L=27 cm, as shown in the figure below. The distance from the infinite wire to the closest side of the rectangle

    asked by Annoyingmous on June 14, 2013
  73. Physics

    An infinite straight wire carrying a current I=5 A flowing to the right is placed above a rectangular loop of wire with width w=11 cm and length L=27 cm, as shown in the figure below. The distance from the infinite wire to the closest side of the rectangle

    asked by Annoyingmous on June 15, 2013
  74. calculus

    an air balloon is 80ft away from you with the angle of elevation of the rising balloon changing at a rate of 4 degrees per second how fast is the balloon rising when it is 6 feet off the ground.

    asked by marcos on March 23, 2016
  75. Algebra

    Lisa is cutting carpet for a rectangular room. The area of the room is 324ft^2 . The length of the room is 3 feet longer than twice he width. What should the dimensions of he carpet be?

    asked by Codey on May 15, 2013
  76. math

    A bookshelf is 9 feet wide. A set of mystery books fills 1/6 of the shelf space. Each book in the set is 3/8 inch thick. How many books are in the set?

    asked by fort on April 16, 2019
  77. Alg/Trig

    If h= -16t^2 + 112t represents the height of a​ rocket, in​ feet, t seconds after it was​ fired, when will the rocket hit the​ ground? (Hint: The rocket is on the ground when h equals=​0).

    asked by Sydney on February 5, 2017
  78. Math

    A supporting wire is to be attached to the top of a 32-foot antenna. If the wire must be anchored 32 feet from the base of the antenna, what length of wire is required? Please explain

    asked by Mala on April 14, 2010
  79. trigometry

    1. A 16-foot ladder on ground level is leaning against a house. If the base of the ladder is placed 5.0 feet from the house, what is the angle formed at the top of the ladder? A. 24° B. 18° C. 72° D. 20° please help I don't know how to do this

    asked by jake on February 20, 2013
  80. math

    A tower casts a shadow 22 feet long. If the angle of depression lookig down from the top of the tower to the tip of the shadow is 14 degrees, what is the height of the tower

    asked by Anonymous on July 25, 2012
  81. Math

    A camper wants to know the width of a river. From point A, he walks downstream 100 feet to point B and sights a canoe across the river. It is determined that = 42°. About how wide is the river?

    asked by J.R. on April 23, 2019
  82. math

    Ms. Billets used 8 feet of string to tie together newspapers to take to the recycling center. What fraction of the string she bought does she have left? She bought a total of 12ft of string.

    asked by Esther on February 17, 2011
  83. Geometry

    Harris is planting a rectangular garden with an area of 48 square feet . He is also putting a fence around his garden . How should hr arrange his garden so he can buy the least amount of fence?

    asked by Anonymous on February 12, 2012
  84. trig.

    A ladder 20 feet long leans against the side of a house. Find the height from the top of the ladder to the ground if the angle if the angle of elevation of the ladder is 80°

    asked by julie on March 7, 2012
  85. geometry

    a tree cast a shadow 25 feet long. the angle of elevation from the far end of the shadow to the top of the tree is 64 degrees,find the heighth of the tree

    asked by tori on February 16, 2012
  86. math

    a baseball diamond is actually a square. the distance between bases is 90 feet. when a runner on first base tries to steal second, a catcher has to throw from home to second base.how far is it between home and second base?

    asked by daniel on September 18, 2012
  87. math

    (exponents and roots) Michael wants to fence in a new garden so that the garden has an area of 625 square feet. If his garden is in the shape of a square, what is the length of each side?

    asked by cassandra on September 18, 2012
  88. trig.

    A ladder 20 feet long leans against the side of a house. Find the height from the top of the ladder to the ground if the angle if the angle of elevation of the ladder is 80°

    asked by julie on March 7, 2012
  89. pre algebra help

    An apple falls from a 28 foot tree. The height of the apple, in feet, after t seconds of falling, can be found using the polynomial 16t 2 + 28. Find the apple's height after 0.5 second.

    asked by amy on May 30, 2012
  90. Math

    A man looks up at the top of a tree. The angle of elevation is 42 degrees. If the tree is 20 feet tall, which of the following best represents the distance from the base of the tree where the man is standing?

    asked by Judi on April 18, 2014
  91. math

    A ten foot long ladder leans against a wall, with the top of the ladder being eight feet above the ground. What is the approximate angle that the ladder makes with the ground? A) 37° B) 47° C) 53° D) 60°

    asked by patricia on April 25, 2017
  92. calculus

    A ball is dropped from the same height, but 20 feet away from the side of the building. The height y of the ball at time t is given by y(t) = 64 − 16t2. How fast is the shadow of the ball moving along the ground after 1 second?

    asked by Anonymous on September 27, 2010
  93. math physics i think

    We have 2 cars. Car "A" and car "B" if car A weighs 3180 lbs If car "B" weighes 2000 pounds How fast would car "A" have to travel to knock car "B" 32 feet?

    asked by Jay Schmetz on September 24, 2011
  94. algebra 1

    A ladder leaning against a house makes an angle of 60 degress with the ground. The foot of the ladder is 7 feet from the foundation of the house.how long is the ladder? please some sugesstions

    asked by nena on April 23, 2011
  95. Algebra

    I have 104 feet to build a dog pen in a rectangle shape. Area=52x-x2 x= width What is the largest width to maximize the area? What is the area?

    asked by Amy on April 16, 2013
  96. algebra

    A rectangle has a length that is 10 less than 3 times the width. If the rectangle has an area of 8 square feet, what is the width of the rectangle. I have to find the answer in meters, some please give some assistance.

    asked by kylie on January 14, 2019
  97. Math

    The velocity of an object is given by the formula v=25t-80, where the time is expressed in seconds and the velocity is expressed in feet per second. Find the times when the magnitude of the velocity is equal to 60 ft/s

    asked by Alex on January 6, 2015
  98. geometry

    Two small fires are spotted by a ranger from a fire tower 60 feet above ground. The angles of depressions re 11.6° and 9.4°. How far apart are the fires? (The fires are in the same general direction from the tower.) please help!!

    asked by morgan on July 6, 2017
  99. math

    A 12 food wide fertilizer spreader drops 45 pounds of fertilizer while traveling 625 feet. What is the fertilizer application rate in pounds/acre?

    asked by Nabil on March 29, 2012
  100. math

    a woman's long jump record is about 1 1/6 the distance of the 15-16-year-old girl's record of 20 13/14 feet. find the distance of the women's record to the nearest foot

    asked by lindsay on January 9, 2019