1. science

    A thermally insulated 50 ohm resistor carries a current of 1 A for 1 s. The initial temperature of the resistor is 10 degree Celsius, its mass is 5 g, its specific heat capacity is 850. What is the change in entropy of the resistor?

    asked by prabhu on February 1, 2012
  2. science dr bob

    if it takes 31,500 joules of heat to warm 750g of water, what was the temperature change? My answer: Q = (M) (DeltaT) (c) Delta T=Q Delta T = 31,500J -------- 750gx 1.0cal/gCo Delta T = 42oC

    asked by sam on April 25, 2008
  3. Science: Chemistry - Enthalpy

    The enthalpy change in the combustion of the hydrocarbon octane is delta H = -5.48 x 10^3 kJ/mol C8H18(l). How much heat, in kilojoules, is liberated per gallon of octane burned? (Density of octane = 0.703 g/mL; 1 gal = 3.785 L.)

    asked by Jackie on June 8, 2011
  4. Chemistry!!

    A 100.0 g sample of ethanol at 25.0 degrees celsius is heated and boiled completely to vapor at its boiling point. How much heat does it absorb? i did.... q=100.0 *2.44*43.5=10,614 J q=100.0*2.44*53.5=13,054. then i added the two q's together and i got

    asked by Miley on May 4, 2008
  5. science

    if it takes 31,500 joules of heat to warm 750g of water, what was the temperature change? My answer: Q = (M) (DeltaT) (c) Delta T=Q Delta T = 31,500J -------- 750gx 1.0cal/gCo Delta T = 42oC

    asked by sam on April 26, 2008
  6. Chemistry

    The enthalpy change in the combustion of the hydrocarbon octane is delta H = -5.48 x 10^3 kJ/mol C8H18 (l). How much heat, in kilojoules, is liberated per gallon of octane burned? (Density of octane = 0.703 g/mL; 1 gal = 3.785 L.)

    asked by Jackie D on June 8, 2011
  7. Physics

    Hi maybe someone can help me out, since my teacher isn't available today and this is due tonight :D. Find the heat that flows in 1.0 s through a lead brick 17 cm long if the temperature difference between the ends of the brick is 9.5 C. The cross-sectional

    asked by Phil on December 10, 2009
  8. Chemistry

    Assume the solubility of benzoic acid in ice-cold water is 1.70 g/L and the solubility of benzoic acid in hot water is 68.0 g/L. Calculate the minimum volume of water (in mL) needed to recrystallize 0.950 g of benzoic acid.

    asked by Jen on August 12, 2012
  9. Chemistry

    Assume the solubility of benzoic acid in ice-cold water is 1.70 g/L and the solubility of benzoic acid in hot water is 68.0 g/L. Calculate the minimum volume of water (in mL) needed to recrystallize 0.350 g of benzoic acid.

    asked by Anonymous on January 30, 2013
  10. Math

    Vicki bought an ice cream cake cut into 6 equal pieces. Vicki, Margo,and Elena each took 2 pieces of the cake home. Vicki says she and each of her friends took 1/3 of the cake home. Is Vicki correct? And

    asked by Mo on March 13, 2014
  11. algebra

    Bob and bill leave the ice cream store at the same time going in opposite directions. If Bob walks 4 miles per hour and Bill walks 3 miles per hour in how many hours will they be 10.5 miles apart

    asked by Anonymous on January 28, 2014
  12. Math-Algebra

    1. The surface area of a cube varies directly as the square of its edge. Find its surface are. 2. A certain object traveling at 24 meters per second has a kinetic energy of 72 joules. If the kinetic energy of that object varies directly as the square of

    asked by Mckenna Louise on November 24, 2013
  13. Chemistry

    A piece of copper metal (specific heat 0.385 J/g∘C) at 85.6 ∘C is placed in 50.0 g of water at 16.2 ∘C. The metal and water come to the same temperature of 23.6 ∘C. What is the mass?

    asked by Hi on September 17, 2015
  14. chemistry

    How much heat is lost when 12.55 g of zinc vapor at 907 degrees celsius is cooled to 425 degrees celsius?

    asked by carly k on January 11, 2015
  15. Chemistry

    to heat 12.4g of water from 20.0 degrees celsius to 25.0 degrees celsius requires ? a. 259 J b. 1300 J c. 040 J d. 1050 J

    asked by Meg on October 16, 2011
  16. earth

    limestone and marble are both used in sculpting. Limestone become marble under heat and pressure. Classify each rock and tell which would be harder to sculpt

    asked by Dominic on January 3, 2010
  17. Physical Science

    A 73.0 g silver spoon at 19.2 c is place in a cup of coffee at 91.2 c. How much heat does the spoon absorb from the coffee to reach a temperature of 85.6 c?

    asked by Rashida on September 17, 2014
  18. chemistry

    Ethylene glycol (antifreeze) has a specific heat of 2.42 J/(g*K). Calculate q when 3.65 kg of ethylene glycol cools from 240 degrees C to 78 C

    asked by Tara on October 27, 2010
  19. science

    it asks for a one sentence rule about relationship between phase changes and temperature and rule about phase change and heat energy

    asked by bellas mom on October 22, 2007
  20. physics

    if you take a 1 liter bottle of water out of the refrigerator at just above 0 celsius., how much heat will it take to raise the water to 90 celsius, so you can make tea out of it.

    asked by Clay on December 7, 2011
  21. Chemistry

    How much energy, in calories, is needed to heat 18 cubic centimeters of fat from 25 degrees Celsius to 35 degrees Celsius?

    asked by Jenn on September 3, 2014
  22. Chemistry

    why shold you heat the evaporating dish containing the contents to fume hood. Why should the content be heated in the fume hood.

    asked by Sarah on April 10, 2010
  23. Chemistry

    If the temperature of 50.0 grams of water was raised to 50°c by the addition of 4180J of heat energy. What was the initial temperature of the water?

    asked by Adora on May 12, 2019
  24. Physical Science

    There are three ways to cook popcorn, list them and relate hoe cooking popcorn is really an example of three ways heat can be tranferred.

    asked by Rachel on March 10, 2008
  25. Chemistry

    How much heat in kilojoules has to be removed from 225g of water to lower its temperature from 25.0 degrees celsius to 10.0 degrees celsius?

    asked by Kayla on October 26, 2012
  26. chemistry

    How much does the molar enthalpy change when 147g of water cools from 90°C to 17.0°C? The molar heat capacity for water is 75.3 j/k•mol

    asked by Gino on November 1, 2015
  27. Chemistry

    By how much will the temperature of 2.00kg of air change if it absorbs all of the heat given up when 1.00kg of water cools from 40.degree to 20 degree? Thanks for all your help

    asked by Saarah on September 11, 2013
  28. chemistry

    if 100j of heat energy is applied to a 25-g sample of mercury, by how many degrees will the temperature of the sample of mercury increase?

    asked by cindy on September 25, 2011
  29. Science

    When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat, the sound wave is......

    asked by Mark Ronson on March 26, 2015
  30. 5th grade science

    Limestone and Marble are both used in scuplturing. Limestone becomes Marble under heat and pressure. Classify each rock, and tell which would be harder to scuplt.

    asked by Anonymous on January 27, 2009
  31. science

    If 1600cals of heat are added to 50g of water initally at a temperature of 10c what is the final temperature of the water?

    asked by linece on December 7, 2012
  32. PHYSICS

    A bottle containing 4 kgof water at a temperature of 15°Cis placed in a refrigerator where the temperature is kept at 2°C.How much heat is transferred from the water to cool it to 2°C?

    asked by B on March 18, 2013
  33. Chemistry

    A 10.0g sample of H2O(l) at 23.0degrees C absorbs 209 joules of heat. What is the final temp of the H2O(l) sample?

    asked by Sabrina on January 19, 2016
  34. Chemistry

    If 22 g of water is heated so that the water temperature rises from 18.1°C to 21.5°C, how many calories have been absorbed by the water? The specific heat of water = 1.00 cal / (g · °C)

    asked by Cassie on October 25, 2010
  35. chemistry

    Ethyl alcohol has a heat of vaporization of 850. J/g. What mass of ethyl alcohol can be boiled using 15000 J of energy?

    asked by Nick on October 18, 2016
  36. physics

    can i have multiple choice questions on thermodynamics: relationship between work and heat, the first law of thermodynamic, and the second law of thermodynamic

    asked by johny on March 18, 2011
  37. physics

    how much heat must be removed from 14 lbs of aluminum block in order to cool it from 80 degrees fahrenheit to 15 degrees fahrenheit?

    asked by asap on February 23, 2015
  38. Physics

    Which has the higher specific heat capacity: an object that cools quickly or an object of the same mass that cools more slowly?

    asked by Tracee on August 11, 2013
  39. chemistry

    What is thermal energy? heat energy

    asked by nikcile on March 31, 2007
  40. Chemistry

    • A student crystallized a compound from benzene and observed only a few crystals when the solution cooled to room temperature. To increase the yield of crystals, the students chilled the mixture in an ice-water bath. The chilling greatly increased the

    asked by david on September 20, 2012
  41. Scienece

    A student crystallized a compound from benzene and observed only a few crystals when the solution cooled to room temperature. To increase the yield of crystals, the students chilled the mixture in an ice-water bath. The chilling greatly increased the

    asked by Josaff on September 26, 2015
  42. science

    The driver of an 800.0 kg car decides to double the speed from 25.0 m/s to 50.0 m/s. What effect would this have on the amount of work required to stop the car, that is, on the kinetic energy of the car?

    asked by veeda on June 29, 2013
  43. chemistry

    How much energy is required to decompose 765 g of PCl3, according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and may be useful. 4 PCl3(g) → P4(s) + 6 Cl2(g), ΔH°rxn = +1207 kJ

    asked by yr on April 27, 2011
  44. physics

    You accelerate your 1500 Kg car from 2 m/s to 12 m/s in 2 seconds. How do you determine the cars acceleration initial momentum final momentum change in momentum the force required to do this?

    asked by Kelley on January 11, 2016
  45. ethics

    Peter Singer argues that giving money to famine relief is: a. Morally permissible. b. Morally forbidden. c. Morally required. d. Supererogatory. my answer is a

    asked by need help please check my answer on February 27, 2014
  46. physics

    a truck with a mass of 2100 kg travels at a constant speed of 75 km/h. (a) What is the magnitude of the truck’s linear momentum? kg·m/s (b) What average force would be required to stop the truck in 7.5 s? does this have to do with f=ma or not? help

    asked by ricchie on December 15, 2012
  47. chem

    What mass of protons would be required to just neutralize the charge of 1.5 g of electrons? my teacher said .0015kg times 1e-/.00091e-27kg times 1pt/1e- times 1.67262e-27 over 1 p

    asked by Sara on September 21, 2010
  48. Physics

    A load of 54 N attached to a spring hanging vertically stretches the spring 4.9 cm. The spring is now placed horizontally on a table and stretched 14 cm. What force is required to stretch it by this amount?

    asked by Kristen on November 23, 2010
  49. Chemistry

    The thermite reaction was used to weld rail ties together. If 15.0 grams of aluminum were used, how many grams of ferric oxide would be required? How many grams of molten iron would forma?

    asked by Step on November 23, 2014
  50. Physics

    A load of 59 N attached to a spring hanging vertically stretches the spring 5 cm. The spring is now placed horizontally on a table and stretched 14 cm. What force is required to stretch it by this amount?

    asked by Maleka on November 22, 2012
  51. Chemistry

    a titration experiment 20 mL solution of hydrochloric acid required 15.2mL of a .879 M barium hydroxide solution. What was the molar concentration of the HCl solution?

    asked by Chris on October 11, 2011
  52. physics

    I am posting this question again as noone has answered it yet. State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS Is a= -6.75D? b= -5.75D? c= -4.75D?

    asked by Please help if you can... on October 24, 2012
  53. Physics

    A load of 54 N attached to a spring hanging vertically stretches the spring 4.9 cm. The spring is now placed horizontally on a table and stretched 14 cm. What force is required to stretch it by this amount?

    asked by Kristen on November 23, 2010
  54. chemistry

    In a buffer pre-lab, we were asked to complete a table for 10 test tubes. In tube 1, you had 0.20 M of acetic acid only and were asked to find the pH. I think the answer is 2.72 (using a ICE table). In tube 2, you have 90 mL of Acetic Acid and 10 mL of

    asked by Trina on May 16, 2011
  55. physics

    A de-orbit burn, similar to that presented in the previous math problem, has been performed. During this de-orbit burn a pre-calculated ∆V (delta V, change in velocity) of 290 ft/s (or 88.4 m/s) will be used to decrease the Shuttle’s altitude from 205

    asked by Levi B. on January 20, 2012
  56. Business Math

    A Cold Stone Creamery ice cream shop sells sundaes for $3.60 and banana splits for $4.25. The shop sells four times as many sundaes as banana splits. If total sales amounted to $3,730 last weekend, how many banana splits were sold? (Points : 2)

    asked by TM on April 30, 2013
  57. equation word problem

    A Cold Stone Creamery ice cream shop sells sundaes for $3.60 and banana splits for $4.25. The shop sells four times as many sundaes as banana splits. If total sales amounted to $3,730 last weekend, how many banana splits were sold? (Points : 2)

    asked by shirley on May 2, 2013
  58. business math

    A Cold Stone Creamery ice cream shop sells sundaes for $3.60 and banana splits for $4.25. The shop sells four times as many sundaes as banana splits. If total sales amounted to $3,730 last weekend, how many banana splits were sold? (Points : 2)

    asked by TM on April 30, 2013
  59. physics

    Bob, who has a mass of 75 kg, can throw a 500 g rock with a speed of 30 m/s. The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. a. What constant force must Bob exert on the rock to throw it

    asked by aithusa20 on September 29, 2014
  60. High School Science

    A ray of light goes from water (nwater=1.333) into ice (nice=1.309). Which of the following statements is true? 1) The ray gets closer to the normal after crossing the interface. 2) The ray does not change directions after crossing the interface. 3)The ray

    asked by Erik on March 20, 2010
  61. physics 100

    Bob, who has a mass of 60 , can throw a 800 rock with a speed of 26 . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 . a) What constant force must Bob exert on the rock to throw it with

    asked by Bob on October 13, 2012
  62. Physics

    Two copper cylinders, immersed in a water tank at 46.3°C contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average kinetic energy of a helium molecule at

    asked by Lyra on January 26, 2014
  63. physics

    Two copper cylinders, immersed in a water tank at 46.3°C contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average kinetic energy of a helium molecule at

    asked by maria on January 3, 2012
  64. physics

    Two copper cylinders, immersed in a water tank at 46.3°C contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average kinetic energy of a helium molecule at

    asked by maria on January 1, 2012
  65. HEAT

    A container holds a quantity of liquid nitrogen at a temperature of -200 degrees C. Explain how each of the following could be used to warm up the nitrogen. a)ice cubes b)hot water bath c)bubbling room air through the liquid All these substances contain a

    asked by Sydney on December 7, 2010
  66. HEAT

    A container holds a quantity of liquid nitrogen at a temperature of -200 degrees C. Explain how each of the following could be used to warm up the nitrogen. a)ice cubes b)hot water bath c)bubbling room air through the liquid All these substances contain a

    asked by Sydney on December 8, 2010
  67. Chemistry

    1) Consider the formation of sulfur trioxide according to the reaction: 2 SO2(g) + O2(g) -> 2 SO3(g) delta H = -198 How much heat is evolved in the formation of 750 grams of SO3? I am not sure how to start this problem.

    asked by Hannah on January 20, 2012
  68. physics

    In a running event, a sprinter does 5.5 105 J of work and her internal energy decreases by 8.8 105 J. Determine the heat transferred between her body and surroundings during this event. ________ J

    asked by amela on November 29, 2012
  69. PHYSICS DUE SOON

    In a running event, a sprinter does 5.5 105 J of work and her internal energy decreases by 8.8 105 J. (a) Determine the heat transferred between her body and surroundings during this event. _____J

    asked by Ame on November 29, 2012
  70. chemistry

    an engine operating between 100 degree celsius and 0 degree celsius takes 453.6 k cal of heat. The usefull work done by it is ? plz teach me the way of calculating it

    asked by star on June 3, 2012
  71. Physics Can you please get me started

    In a running event, a sprinter does 5.5 105 J of work and her internal energy decreases by 8.8 105 J. Determine the heat transferred between her body and surroundings during this event. ________ J

    asked by amela on November 29, 2012
  72. chemistry

    A 1.07g sample of sulfur was burned in a bomb calorimeter whose calorimeter constant is 2.03 k cal/C. If the resulting temperature change was 1.17 C, what is the molar heat of combustion for sulfur?

    asked by Lynden on October 15, 2014
  73. Chemistry

    is this right when a fuel is burned some of its chemical potential energy is lost as heat. and To convert kilojoules to joules dived the number of kilojoules by 1000 joules/1 kilojoule

    asked by Anonymous on February 23, 2010
  74. PHYSICS

    A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C .Calculate the heat loss rate in watts

    asked by KAIT on August 18, 2011
  75. physics

    a. A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C Calculate the heat loss rate in watts

    asked by KAIT on August 18, 2011
  76. Chemistry URGENT!

    If the reaction of 0.500 grams of aluminum metal with excess aqueous HCl releases 9.72 kJ of heat, what is the ΔH value for the reaction? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) All I have is: .500gAl*(1 mol Al/26.98gAl) Please and thank you so

    asked by Jim on September 10, 2015
  77. Chemisty HELP ASAP

    In this problem, your answers should be mathematical expressions involving a variable. Consider an ideal gas with an absolute temperature of T1 To what temperature would you need to heat the gas to double its pressure? T2=? I got T2=2P but it is wrong

    asked by Bill on October 17, 2012
  78. Physics

    A closed organ pipe 0.8 m long has a diameter of 7.0 cm. The air in the church is 15oC. What is the fundamental frequency? If the heat is turned up to 20oC, what is the new fundamental frequency? - HELPHELPHELP

    asked by Kai on March 1, 2011
  79. Clean Energy

    What are some types of clean enregy and what are they? I have geothermal - heat from the Earth, hydropower - water power, wind power, biomass (I don't know what that is), and solar power - sun power. I would really like some help.

    asked by Jibbie on September 19, 2012
  80. chemistry

    From data below, calculate the total heat (J) needed to convert 0.298 mol of gaseous ethanol (C2H6O) at 401°C and 1 atm to liquid ethanol at 25.0°C and 1 atm.

    asked by myles on October 6, 2010
  81. natural science

    1.write down the aim of the investigation? 2.make aprediction ofthe outcome ofthe investigation? 3. Switchon the hotplate to its maximum heat and start the stopwatch immediately after that?

    asked by anam on September 13, 2016
  82. Chemistry I

    25.0 mL of ethanol (density = 0.789 g/mL) initially at 4.2°C is mixed with 35.7 mL of water (density = 1.0 g/mL) initially at 25.3°C in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?

    asked by Robbie on September 15, 2010
  83. chemistry

    If 51.6 mL of ethanol (density = 0.789 g/mL) initially at 6.4°C is mixed with 48.9 mL of water (density = 1.0 g/mL) initially at 29.1°C in an insulated beaker, and assuming that no heat is lost, what is the final temperature of the mixture?

    asked by MK on October 15, 2013
  84. Physics

    A 100 gram mass of metal at 106°C is placed in 100 grams of cool water at 22°C. The final temperature of the mixture is 25°C. What is the specific heat capacity of the metal?

    asked by Kat on February 24, 2017
  85. physics

    if two lighting volts heat exactly same place at the same time in are frame of ref,it is possible that observes in other frames will see the volts heating at def. time or diff. places? explain

    asked by angie on September 25, 2011
  86. PHYSICS

    A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C .Calculate the heat loss rate in watts

    asked by KAIT on August 18, 2011
  87. phys. science

    when most matter is heated it expands right? & doesnt water expand when it is heated? & what is the diff. b/w thermal conductor and thermal insulator? & in which direction will heat spontaneously flow?

    asked by leann on May 15, 2008
  88. Thermochemistry

    A 1.00-g sample of solid calcium was burned in fluorine to give a 1.95 g sample of pure CaF2. The energy given off in this reaction was 30.3 kJ. Given this information, we can say that the heat of formation of 1 mol of CaF2 is

    asked by joan on June 19, 2010
  89. Science

    3. When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat, the sound wave is (1 point) A.reflected. B.refracted. C.absorbed.*** D. Transmitted.

    asked by jeje on January 21, 2015
  90. chemistry

    25.0 mL of ethanol (density = 0.789 g/mL) initially at 5.5°C is mixed with 32.3 mL of water (density = 1.0 g/mL) initially at 25.3°C in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?

    asked by Anonymous on September 19, 2014
  91. Chemistry

    2NaHCO3(s)+ heat -->Na2CO3(s)+ H2O(g)+CO2(g) is this right ? Determine how many moles of CO2(g) is produced when 7mols of NaHCO3 are consumed. question i asked earlier, i got 3.5 moles am i right ?

    asked by Hannah on February 24, 2011
  92. chemistry

    How would CO2 form from the reaction of 3-methyl benzoic acid with bis(trichloromethyl) carbonate (triphosgene)? Is it possible to form CO2 from a mixture of dichloro ketone in heat?

    asked by jason on April 21, 2009
  93. physics

    a. A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C Calculate the heat loss rate in watts

    asked by KAIT on August 18, 2011
  94. chem

    two metals both at a temperature of 25 degrees celsius are placed in separate beakers. metal A has a larger specific heat than metal B. which beaker will exhibit a greater change in temperature

    asked by lynn on June 30, 2011
  95. Physics

    A reversible engine converts 1/6 of the heat input into work. When the temperature of the sink is reduced by 62C, the efficiency of the engine is doubled.What are the temperarure of the source and sink?

    asked by Tulika on April 19, 2012
  96. physics

    An ideally efficient freezer cools food to 260 K. If the room temperature is 300K, how much work does the freezer consume when removing 100J heat from the food?

    asked by garnel on April 8, 2013
  97. chemistry

    A man consumes 50,000J of heat in doing his work out activities. A serving of his food provides him with 25,000J of energy. Interpret the energy values in terms of first law of thermodynamics.

    asked by jaycab on January 23, 2011
  98. Chemistry

    A 34.6 g block of metal at 2.1oC is dropped into 100.0 g of water at 97.3oC. If the specific heat of the metal is 0.084 cal/goC, what will the final temperature of the water be?

    asked by Kat on April 24, 2011
  99. Physics

    A person eats a container of yogurt. The Nutritional Facts label states that it contains 195 Calories (1 Calorie = 4186 J). What mass of perspiration would one have to lose to get rid of this energy? At body temperature, the latent heat of vaporizaiton of

    asked by Jenny on April 5, 2008
  100. Physics

    A person eats a container of yogurt. The Nutritional Facts label states that it contains 195 Calories (1 Calorie = 4186 J). What mass of perspiration would one have to lose to get rid of this energy? At body temperature, the latent heat of vaporizaiton of

    asked by Thomas on April 6, 2008