1. AP Chemistry

    I need help with figuring out an appropriate way to do this sort of lab: how to determine an unknown compound. With this one however, the teacher just gave us a white powdered compound - and asks us to figure out how to identify it using ANY lab

    asked by T on May 18, 2009
  2. Psychology

    Nelda is fearful of public places and has managed to stay "at home" for the last three years. She and her therapist have developed a strategy. During the first week, she will go to the front door and open it and look outside. If she can remain calm, the

    asked by karen on July 26, 2013
  3. Business

    Lisa is considering a wireless order-taking system, and she has asked you to do a cost analysis of acquiring it. Consider the following information in your analysis: • The acquisition cost is $35,000 paid at the time of installation. • It reduces the

    asked by victoria on May 29, 2010
  4. Physics

    Two cars lost in a blinding snowstorm are traveling across a large field, each thinking they are on the road, as shown in the figure on the left. They collide. If the distance x is 141 meters and the red car is travelling at 19.5 mph, how fast to the

    asked by Mirana Alam on August 24, 2013
  5. math

    An open box is to be made from a square piece of material by cutting four-centimeter squares from each corner and turning up the sides (see figure). The volume of the finished box is to be 256 cubic centimeters. Find the size of the original piece of

    asked by Anonymous on February 4, 2019
  6. chemistry

    Use the following information to identify element A and compound B, then answer questions a and b. 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

    asked by Sara on December 7, 2006
  7. math

    On the side of a parade ground there are two flag poles. The first is 11m high and the second is 8m high. At 3pm the shadows cast by both poles overlap each other perfectly and the furthest point of both shadows is exactly 13m from the base of the base of

    asked by Nisha on May 18, 2014
  8. math

    Let S be the part of the sphere x^2 + y^2 + z^2 = 25 that lies above the plane z = 4. Let S have constant density k. (a) Find the center of mass. (b) Find the moment of inertia about the z-axis. so far I have found that the magnitude of r(theta)x r(thi)=

    asked by Anonymous on December 8, 2014
  9. Calculus (math)

    A painting in an art gallery has height h and is hung so its lower edge is a distance d above the eye of an observer (as in the figure). How far from the wall should the observer stand to get the best view? (In other words, where should the observer stand

    asked by mariel on November 7, 2014
  10. probabilities

    A brand name has 50% recognition rate. Assume the owner of the brand wants to verify that rate by beginning with a small sample of 6 randomly selected consumers. How would you do the binomial probability formula can be used to find the simple binomial

    asked by slomomo on February 19, 2015
  11. Physic

    The composite bar BCD in the figure is composed of an inner aluminum cylindrical core of length 2L=2 m and radius R=1 cm, and a sleeve of steel of length L=1 m and thickness R=1 cm surrounding the aluminum core in the CD section of the bar. The bar is

    asked by Me on May 7, 2013
  12. Accounting

    I am trying to tell the difference between trade credit and opportunity costs, but now liking what I find on the internet. Is there a link that shows both? I could not find one. In order to do my assignment I need to compaire the two so I could figure out

    asked by Luke on May 6, 2010
  13. Physics

    A boy starts at rest and slides down a frictionless slide as in the figure below. The bottom of the track is a height h above the ground. The boy then leaves the track horizontally, striking the ground a distance d as shown. Using energy methods, determine

    asked by Brandon on October 17, 2011
  14. Math

    The Booster Club has a goal of raising at least $300. The Club has already raised $150. The Booster Club is sponsoring a pancake breakfast and charging $4.00 per ticket. What inequality would represent the number of tickets (t) that the Booster Club must

    asked by Kelli on January 26, 2015
  15. Physics

    Two blocks, each of mass m = 3.35 kg are hung from the ceiling of an elevator as in the figure below. (a) If the elevator moves with an upward acceleration a with arrow of magnitude 1.7 m/s2, find the tensions T1 and T2 in the upper and lower strings. T1 =

    asked by Jack on October 2, 2016
  16. Algebra

    I can not figure out how to set this problem up. I know the answer is 200 mi, 220 mi. Two different routes between two cities differ by 20 miles. Bill and Lou made the trip between the cities in exactly the same time. If one traveled the shorter route at

    asked by Hutch on October 27, 2015
  17. Physics

    A ball of mass m 0.285 kg swings in a vertical circular path on a string L = 0.810 m long as in the figure below. a) If its speed is 5.25 m/s at the top of the circle, what is the tension in the string there? 6.89N (is the answer) b)If the string breaks

    asked by Jack on October 7, 2016
  18. Chemistry

    DECOMPOSITION OF NO2 (10/10 points) The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in mol/liter, while time is expressed in seconds. [NO2] ln[NO2] 1/[NO2] Time

    asked by 3.091 on July 30, 2014
  19. Chemistry, HELP!!

    a) If the volume of a flask is 165 mL and the mass of the vapor in the flask is 0.2136 grams, what is the density of vapor in the flask? b)If the temperature of the vapor is 25 degrees Celsius, what is the molecular weight of the vapor? (Assume the gas

    asked by Brian on September 23, 2014
  20. physics

    .10 mol of Argon gas is admitted to an evacuated 50cm cubed container at 20 degrees celsius. The gas then undergoes an isobaric heating to a temperature of 300 degrees celsius. What is the final volume of the gas?

    asked by Syed on August 3, 2009
  21. Physical Science

    Explain how you can use Boyle's law to determine the new volume of a gas when it's pressure is increased from 270 kPa to 540 kPa? The original volume of gas was 1 l. Assume the temperature and number of particles are consistent. What is the new volume?

    asked by Jamie on October 20, 2015
  22. Physics Q

    If a water heater has a capacity of 54.4 gallons and a 4910 W heating element, how much time is required to raise the temperature of the water from 19.8oC to 60.0oC? Assume that the heater is well insulated and no water is withdrawn from the tank during

    asked by Emma on November 10, 2012
  23. physical science

    Lead is a soft, dense metal with a specific heat of 0.028 kcal/kg·C°, a melting point of 328.0°C, and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 202.2 kg sample of lead with a temperature of 20.0°C?

    asked by Anonymous on October 12, 2010
  24. P.E.

    i live in california and it gets really hot around 105 lately. Can a pe teacher make us run is this kind of heat??? The PE teacher has little control over the temperature in California, but she can control how you get fit...and the teacher is trained on

    asked by Nicole on August 29, 2005
  25. chemistry

    dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction

    asked by thomas on May 9, 2015
  26. Chemistry

    A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from a. 200. K to 400. K b. 200. C to 400. C How do you know if it's kelvin or celsius? k= c

    asked by danny123 on December 4, 2010
  27. chemistry dont know how to do it

    dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction

    asked by Anonymous on May 10, 2015
  28. Physics!

    If a water heater has a capacity of 54.4 gallons and a 4910 W heating element, how much time is required to raise the temperature of the water from 19.8oC to 60.0oC? Assume that the heater is well insulated and no water is withdrawn from the tank during

    asked by jake on November 11, 2012
  29. chemistry

    At 298K, Go = -141.8 kJ for the reaction 2 SO2 + O2 in equilibrium with 2 SO3 Calculate the change in Gibbs free energy (in kJ) at the same temperature when P (SO2) = 0.505 bar, P (O2) = 0.80 bar and P (SO3) = 1.317 bar. (R = 8.314 J/K mol)

    asked by tyson on November 19, 2010
  30. thermodynamics

    dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction

    asked by Anonymous on May 10, 2015
  31. Chemistry

    a student puts 1.25 kg of ice in an ice cream maker with 350 g of rock salt. All the ice eventually becomes liquid water as the rock salt dissolves. Solve for the molality of the solution, then for its new freezing temperature.

    asked by THATONEGUY on May 20, 2015
  32. Physics

    How long does it take a 1000. W electric kettle to bring 1.0L of water to the boiling point if the temperature of the water and the kettle is 15 C? The kettle os made of 0.400kg of iron. Assume that no water is lost to steam, and that the kettle is 100%

    asked by Dorrito on December 8, 2011
  33. science: chemistry

    When a sample of potassium nitrate is heated, oxygen gas is produced. This gas, collected in a 750 milliliter flask, has a pressure of 2.8 atmosphere and the temperature is recorded to be 53.6°C. How many moles of oxygen gas are produced in this reaction?

    asked by Jane Doe on July 15, 2011
  34. chemistry(check my answers please)

    1)An increase in temperature ____________ the kinetic energy and average speed of the gas particles. A. decreases B. increases 2)As a result, the pressure on the walls of the container __________. A. decreases B. increases C. is not affected 1) i think its

    asked by eng on January 23, 2010
  35. physics

    A 1.4-kg copper block is given an initial speed of 2.0 m/s on a rough horizontal surface. Because of friction, the block finally comes to rest. (a) If the block absorbs 85% of its initial kinetic energy as internal energy, calculate its increase in

    asked by Anonymous on April 11, 2012
  36. Chem

    a container of 2.00 moles of an ideal gas as 1000 K undergoes a constant pressure and volume process in which the number of moles is increased to 5moles. what is the final temperature of the gas. How do I start this? Do I somehow use the ideal gas law?

    asked by Don on November 30, 2010
  37. Chemistry

    A 271-g sample of nickel at 94.1°C is placed in 100.0 mL of water (density = 1.00 g/mL) at 23.9°C. What is the final temperature of the water? [Assume that no heat is lost to or gained from the surroundings. Specific heat capacity of nickel = 0.444

    asked by Chris on May 5, 2014
  38. science

    We were having a discussion while watching the weather channel. If portions of Oklahoma have temperatures from the 30's to the 50's and another portion of oklahoma had temperatures upper 70's and 80's and finally another section of Oklahoma low 60's to

    asked by tgsd on October 9, 2011
  39. Physics

    A solid is completely submerged in a particular liquid and floats at a constant level.when the temperature of the liquid in the solid is raised, the liquid expands more than the solid. will this make the solid rise upward remain floating or sink explained

    asked by Christine on January 19, 2016
  40. Chemistry

    What volume of “wet” methane would have to be collected at 20.0 oC and 760.0 torr to be sure the sample contained 2.00 x 102 ml of dry methane at the same temperature and pressure ? My Work: All I have so far is that I use P1V1=P2V2 but I don't know

    asked by Joe on September 7, 2015
  41. Physical Science

    lead has specific heat of .028kcal/kgC, melting point of 328 degrees C and a heat fusion of 5.5 kcal/kg. how much heat must be provided to melt a 250kg sample of lead with a temperature of 20 degrees Celsius?

    asked by yolanda on April 8, 2011
  42. Chemistry (Gas Law)

    A fire extinguisher filled with carbon dioxide has a mass of 3500g. After releasing all of the CO2, the mass of the extinguisher is 2735g. What was the pressure reading on the gauge before any CO2 was released, if the volume of the extinguisher is 4.25 L

    asked by Anonymous on July 20, 2013
  43. physics

    A bat flying at 4.54 m/s emits a chirp at 115 kHz. If the pulse is reflected by a wall, what is the frequency (kHz) of the echo heard by the bat? The temperature of the air is 25.0 C. (HINT: What is the source of the sound heard by the bat?)

    asked by Anonymous on February 11, 2014
  44. biology

    1-Why is so much heat lost from, head, hands, feet? 2-Why would the body cool down at high altitudes regardless of outside temp? 3-Describe changes that occur as body tries to acclimatize to high altitudes? 4-Describe causes and effects of pulmonary edema

    asked by paul on December 6, 2009
  45. Physics

    A projectile is fired straight up from a cliff which is 200 feet above ground with an initial velocity of 220 ft/sec. Assume that the only force affecting the projectile during flight is from gravity which produces a downward acceleration 32 ft/sec^2. Find

    asked by Marina on December 8, 2010
  46. Math

    A projectile is fired straight up from a cliff which is 200 feet above ground with an initial velocity of 220 ft/sec. Assume that the only force affecting the projectile during flight is from gravity which produces a downward acceleration 32 ft/sec^2. Find

    asked by Marina on December 8, 2010
  47. physics

    Suppose the Earth's orbit is divided in two by its minor axis as shown in the figure. How much longer in days does the Earth spend in one half than the other? The eccentricity of an elliptical orbit is defined as e:=a/c where c is the semi-major axis and a

    asked by Kay on June 25, 2013
  48. physics

    An 8 g bullet is shot into a 4.0 kg block, at rest on a frictionless horizontal surface. The bullet remains lodged in the block. The block moves into a spring and compresses it by 3.7 cm. The force constant of the spring is 2500 N/m. In the figure, the

    asked by Georgey on March 31, 2014
  49. engilsh

    I cant figure out the answer to dis queston. What type of poem is this? Bounce, bounce, Oh, bouncing ball, In the gym or in the hall, On the rim against the wall, Off the head, off the foot, On the court or out of bounds, Bounce, Bounce, Bounce, Oh,

    asked by Aeliayo on March 19, 2016
  50. math

    find the perimeter of a triangle if one side is 28 feet , another side is four-ninth the perimeter , and the third side is two-fifth the perimeter.

    asked by TALAL on March 10, 2011
  51. Algebra 2

    Can someone explain how to figure out these types of problems? Solve log3 (x - 4) > 2. Evaluate log7 49. If log5 4 ≈ .8614 and log5 9 ≈ 1.3652 find the approximate value of log5 36. Solve the equation, log4 (m + 2) - log4 (m -5) = log4 8. Solve, 2^x =

    asked by Nikki on October 20, 2017
  52. math

    a painter is painting the ceiling of a square room. The walls are all 15 ft long. If a gallon of paint covers 45 square feet, how many gallons of paint will be needed to cover the entire ceiling? A. 4 Gallons B. 5 Gallons C. 6 Gallons D. 3 Gallons

    asked by Cierra on March 26, 2014
  53. english (opinion)

    SO this guy is going through depression because the job that he does is no longer brings happiness to him any more. He is an activist. One day he sat and thought that if he actually does achieve his goal will he be happy? His answer was no. This made him

    asked by Alliana on May 8, 2011
  54. Physics

    3. What happens to the speed of ocean waves as they come close to shore? How can this be explained from what you've learned so far? (this the teacher means what do the lessons have to do with this question) 4. Sound travels faster through wood than through

    asked by Manie on January 4, 2017
  55. graphing

    Can someone show me how to solve these inequalties for me? I cannot figure any of them out -6 < x and 3 < 6 (Remember this is an "and" statement) -3x < -6 or x + 5 < -2 x - 2 > 2x + 1 or -10 > -2x - 2 First of all, the first problem makes nonsense. The

    asked by mike on May 18, 2007
  56. Physics

    3. What happens to the speed of ocean waves as they come close to shore? How can this be explained from what you've learned so far? (this the teacher means what do the lessons have to do with this question) 4. Sound travels faster through wood than through

    asked by Manie on January 3, 2017
  57. math

    There is 70m of fencing wire which is used to create 3 sides, brick wall is used for the 4th side. Calculate the maximum area of the rectangle, and state it's dimensions. (I got the correct maximum area but can't figure out how to get the side lengths.) I

    asked by Side length of a question help on June 16, 2015
  58. Pre-school education

    Create a list of at least 10 literacy enhancements you would make a preschool classroom environment. 1. Story Tapes 2. Charting and graphing 3. Word Walls 4. Quotes on Children's Artwork 5. Flannel boards with Stories 6. Poems on the Wall I am suck on

    asked by Patrick on October 27, 2018
  59. Physics

    A flat circular mirror of radius 0.120 m is lying on the floor. Centered above the mirror, at a height of 0.830 m, is a light source. Calculate the diameter of the bright circular spot formed on the 2.90 m high ceiling by the light reflected from the

    asked by rudi on September 1, 2010
  60. physics

    Consider a thin, infinitely long conducting ribbon that carries a uniform current density j (current per unit area). The width of the ribbon is w and its thickness s is extremely small (s≪w). P is a point in the plane of the ribbon, at a large distance

    asked by sat on April 26, 2013
  61. Physics

    Two horizontal forces Upper F1 Baseline and F2 act on a 3.6 kg disk that slides over frictionless ice, on which an xy coordinate system is laid out. Force F1 is in the positive x direction and has a magnitude of 7.1 N. Force F2 has a magnitude of 9.3 N.

    asked by patrick on March 15, 2015
  62. Physics

    A flat circular mirror of radius 0.120 m is lying on the floor. Centered above the mirror, at a height of 0.830 m, is a light source. Calculate the diameter of the bright circular spot formed on the 2.90 m high ceiling by the light reflected from the

    asked by rudi on September 1, 2010
  63. Personal Ethical Standard

    You are a prison guard supervising a tier. One of the inmates comes to you and asks a favor. Because he is a troublemaker, his mail privileges have been taken away. He wants you to mail a letter for him. You figure it’s not such a big deal; besides, you

    asked by Kish on February 29, 2008
  64. Calculus help

    \documentclass{article} \usepackage{amssymb,amsmath,amscd,concmath} \pagestyle{empty} \begin{document} \begin{equation*}\int_{1}^{3} [(e^3/x)/(x^2)]\, dx\end{equation*} \end{document} Sorry,the html format does not work... How to find the integral of

    asked by Linda on February 20, 2007
  65. physics

    a) a driver of mass 55kg needs to jump to a height of 1.1m above her take off height, at which point her speed needs to be 0.5m/s^. How fast just she be travelling the instant her feet leave the diving board? So we know eg=mgh =9.8*55*1.1 I assumed we're

    asked by alex on March 28, 2017
  66. math

    In a recent survey of 100 women, the following information was gathered. 53 use shampoo A. 31 use shampoo B. 31 use shampoo C. 4 use shampoos A and B. 10 use shampoos A and C. 13 use shampoos B and C. 3 use all three. Use the figure to answer the question

    asked by Anonymous on August 16, 2012
  67. AP Giannini

    Dexter makes a scale drawing of his room. In real life, the room is 10' wide and 12'6" long. In Dexter's drawing, the room is 4"wide, what measure should the length be? explain how you figure this out.

    asked by Lily on October 15, 2014
  68. math

    In a recent survey of 100 women, the following information was gathered. 31 use shampoo A. 27 use shampoo B. 36 use shampoo C. 8 use shampoos A and B. 3 use shampoos A and C. 5 use shampoos B and C. 1 use all three. Use the figure to answer the question in

    asked by Anonymous on August 13, 2012
  69. metric system

    does 1 liter = 1 kg? If the liquid is H2O, yes. To convert volume to mass, you need to know the density. They are not the same thing. Volume = Mass/Density and the volume you're talking about is in liters? 1 mL = 1cm (for water) so convert it to figure it

    asked by Jan on December 17, 2006
  70. algebra

    Graph the following equations; calculate the slope, x-intercept, and y-intercept, and label the intercepts on the graph. Find the area of a rectangle if three of its corners are (-0.1,-3.4), (-7.9,-3.4), and (-0.1,6.8). one I draw the graph how do I figure

    asked by bianca on February 28, 2011
  71. math

    In a recent survey of 100 women, the following information was gathered. 32 use shampoo A. 41 use shampoo B. 40 use shampoo C. 2 use shampoos A and B. 4 use shampoos A and C. 10 use shampoos B and C. 1 use all three. Use the figure to answer the question

    asked by Anonymous on September 11, 2012
  72. Math

    Ivan has 5 times as may blue beads as red beads he has 49 red and blue beads in all. how man blue beads does he have ? I am a mother of a 4th graded I need help trying to help her understand how to do this cause I can't figure it out I know it's a 2 step

    asked by Jae'la on September 26, 2014
  73. math

    Dad baked a batch of cookies. My brother ate half my mom ate a fourth of the batch. Dad ate 3 and I ate the last two. How many cookie did dad bake? PLEASE help me figure this problem out?

    asked by emily on April 10, 2013
  74. math-please help!

    The number of complaints received by a business bureau can be represented by the following probability distribution. Find the expected number of complaints per day. complaints per day -0,1,2,3,4,5 probability-0.01,0.11,0.26,0.28,0.19,0.12 can someone

    asked by KiKi on April 25, 2010
  75. physics

    A 15 g lead bullet is tested by firing it into a fixed block of wood with a mass of 1.05 kg. The block and the embedded bullet together absorb all the heat generated. After thermal equilibrium has been reached, the system has a change in temperature

    asked by jen on September 23, 2010
  76. CHEMISTRY

    The atmosphere contains about 6.8×1013 moles of ozone. If this amount of ozone gas is compressed into a thin layer around the globe (the radius of Earth is 6370 km) at STP (Standard Temperature (0°C) and Pressure (1.0 atm.)), how thick will the layer be

    asked by HELP!!!!! on March 5, 2010
  77. Physics

    The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900 J/kg • K. If 300 kJ of heat are added to 442 g of aluminum at 100°C, what is the final state of the system? That is, how much is liquid,

    asked by MB on March 10, 2016
  78. chemistry

    When a 3.10g sample of liquid octane (C8H18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 26.8∘C. The heat capacity of the calorimeter, measured in a separate experiment, is 6.30kJ/∘C . Determine ΔErxn for the

    asked by annoymous on October 28, 2014
  79. Chemistry

    Methanol (CH3OH) is produced commercially by the catalyzed reaction of carbon monoxide and hydrogen: CO (g) + 2H2 (g) -> CH3OH (g) An equilibrium mixture in a 2.50 L vessel is found to contain 2.62e-2 mol CH3OH, 0.170 mol CO, and 0.303 mol H2 at 500 K.

    asked by Anonymous on September 8, 2009
  80. Physics

    A brass lid screws tightly onto a glass jar at 20 oC. To help open the jar, it can be placed into a bath of hot water. After this treatment, the temperature of the lid and the jar are both 60 oC. The inside diameter of the lid is 8.0 cm at 20 oC. Find the

    asked by Eric on September 20, 2010
  81. Physics

    A brass lid screws tightly onto a glass jar at 20 oC. To help open the jar, it can be placed into a bath of hot water. After this treatment, the temperature of the lid and the jar are both 60 oC. The inside diameter of the lid is 8.0 cm at 20 oC. Find the

    asked by Eric on September 20, 2010
  82. chemistry

    a closed gas cylinder contains 0.500 mole h2, 0.300 mole o2, 1.200 mole co2 at a temperature of 25'c and presure of 2.00 atm 1) calculate the volume of the cylinder 2) calculatethe partial pressure of the cylinder if the volime is decreased to 25% of its

    asked by annah on October 26, 2012
  83. Physics

    A bat emits a chirping sound of frequency 67.0 Hz while moth hunting. The chirp lasts for 1.0 ms and then is silent. The beginning of the echo returns just after the outgoing chirp is finished - how close to the moth is the bat? Assume a cool night with

    asked by Dee on November 30, 2010
  84. chemistry

    couple theory questions i don't quite understand... What is vapor pressure ad why does it change with temperature? and... The assumption was made that slight changes in the depth under the surface of the water will not significantly change total pressure

    asked by alicia on January 31, 2008
  85. chemistry AP

    Give a scientific explanation for the following observations: Perspiring is a mechanism for cooling the body -is it because when something is heated it produces a salt and h2o, so when our body heats up the chemicals in our body let out salt and water,

    asked by ivy on January 29, 2008
  86. Physics

    In a physics experiment, Wendy immersed a copper of mass 300g in 100 degree C in boiling water and left it there for several minutes. She then transferred the cube to 0.2 kg of water at 10 degrees C. The final temperature of the mixture was 21 degrees C.

    asked by Samantha Chow on April 18, 2010
  87. chemistry

    When 0.638 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 104C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. The molar heat of reaction for the

    asked by Anonymous on February 18, 2009
  88. chemistry

    When a 3.90-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter, the temperature drops from 24.5°C to 19.3°C. Calculate DH (in kJ/mol NH4NO3) for the solution process NH4NO3(s) ---> NH4+(aq) + NO3-(aq) Assume that

    asked by Kevin on July 4, 2012
  89. Algebra

    A certain kind of ant can also be used as a thermometer. USE the formula to complete this table off values. T= 11s+ 39 S= speed in inches per minute T= temperature in degrees Fahrenheit S= 1, 2, 3, 4, 5 now I got these answers for the temps T= 40, 61, 72,

    asked by Chey on May 29, 2018
  90. chemistry

    The fuel value of hamburger is 3.6kcal/g. If a man eats 1 pound of hamburger for lunch and if none of the energy is stored in his body, estimate the amount of water that would have to be lost in perspiration to keep his body temperature constant. (the heat

    asked by Mischa on October 4, 2008
  91. Calculus

    An airplane takes off from an airport at sea level and climbs at the constant rate of 5m/s . The outside air temperature T varies with altitude h according to the law T=15-0.0065h where T is measured in degree Celsius and h in meters above sea level . Find

    asked by Anonymous on September 9, 2016
  92. Chemmistry gas laws

    CH2==Ch2(g) ----> CH4(g) + C (graphite) If the decomposition begina at 10 degrees C and 50.0 atm with a gas density of 0.215 g/mL and the temperature increases by 950K, what is the final pressure of the confined gas (ignore the volume of graphite and use

    asked by tori on October 13, 2011
  93. chemistry

    the molar heat capacity of water at 25 degrees celsius is 75.29JK/mol. an exothermic reaction with -5.00kJ proceeded to completion in a 200mL dilute aqueous solution,initially at 16.0 degrees celsius. what is the final temperature of the solution ? clearly

    asked by ayanda on April 11, 2012
  94. chem

    You mix 5.32 g of solid magnesium sulfate with 105.24 g of water inside a calorimeter. As the magnesium sulfate dissolves, the temperature of the solution rises from 24.5°C to 30.1°C. Calculate the amount of energy in kJ that was transferred into the

    asked by Anonymous on November 11, 2015
  95. physics help please

    Consider a system in which 3.60 mol of an ideal monatomic gas is expanded at a constant pressure of 101 kPa from an initial volume of 2.15 L to a final volume of 3.87 L. (b) Find the change in temperature for this process. ? K (c) Determine the amount of

    asked by kelsey on December 14, 2008
  96. CHEMISTRY: URGENT

    30cm^3 of a mixture of methane and ethane were mixed with 100cm^3 of oxygen at ordinary temperature and pressure and exploded. After cooling the residual gases occupied 61.5cm^3. Find the percentage by volume of each gas in the mixture, methane (CH4) and

    asked by LC on October 29, 2012
  97. Science - Mercury

    So I'm in the middle of working on a science portfolio and it says: How will you overcome these challenges with the design of your spacecraft? you see I'm planning my own mission to space and I'm traveling to mercury, but I don't know how my spacecraft

    asked by Areana on November 5, 2015
  98. CHEMISTRY URGENT!!!

    A hot-air balloon has a volume of 970 L at 28 degrees C . To what temperature must it be heated to raise its volume to 1200 L , assuming the pressure remains constant? so it would be 970L/28degreesC=1200L/x? I did that and I got 34.6 degrees C and when i

    asked by Anonymous on April 24, 2012
  99. OCHem

    The amount of methylcycloheane with the substituent in the equatorial orientation at room temperature (25C) would be The Gibbs free energy for axial methyl to equatorial methyl is -7.28Kj/mol (the universal gas constant is 8.314 j/deg-mol). I cant remember

    asked by Alex on December 10, 2010
  100. Physics

    The Trans-Alaskan pipeline is 1300 km long, reaching from Prudhoe Bay to the port of Valdez, and is subject to temperatures ranging from -72°C to +38°C. (a) How much does the steel pipeline expand due to the difference in temperature? (The coefficient of

    asked by Madison on November 14, 2012