Lance

Popular questions and responses by Lance
  1. Chemistry

    Propane, C3H8, is a common fuel gas. Use the following to calculate the grams of propane you would need to provide 383 kJ of heat. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g) ΔH = −2043 kJ

    asked on June 7, 2011
  2. bobpursley, drwls. ms. sue Writeacher

    When a second post is made to a question, the most recent is now at the bottom. Do any of you prefer the way it was, or do you like this better? I prefer to have the answers shown in the order they were posted. The second answer may clarify or add

    asked on June 16, 2005
  3. Chemistry

    A sample of ethanol, C2H5OH, weighing 2.84 g was burned in an excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rose from 25.00°C to 33.73°C. If the heat capacity of the calorimeter and contents was 9.63 kJ/°C, what is the value

    asked on June 7, 2011
  4. Phase

    http://en.wikipedia.org/wiki/Melting_point Question: A solid substance has a vapor pressure of 100 mmHg at the melting point (100C). Assuming an atmospheric pressure of 760 mmHg, describe the behavior of this solid as the temperature is raised from room

    asked on November 13, 2006
  5. Physics

    A 500-mL beaker has a mass of 250 g when empty and 645 g when filled with an unknown liquid. What is the density of the liquid?

    asked on May 2, 2018
  6. Math

    If f(x)=5x-12, find a value for x so that f^-1(x)=f(x+1). Thank you so much

    asked on April 7, 2016
  7. Chemistry

    Calculate the molar heat of neutralization in kj/mol of the reaction between HA and BOH given the following information: The temperature change equals 9C 50mL of 1M concentration of Acid 50ml of 1M concentration of Base Heat Capacity of the calorimeter is

    asked on June 27, 2011
  8. Physics

    What is the gauge pressure if the absolute pressure is 400 kPa?

    asked on May 7, 2018
  9. Physics

    An object is placed at a distance of 60 cm from a converging lens with a focal length of 20cm. What is the magnification of the lens?

    asked on April 10, 2018
  10. Physics

    What is the absolute pressure 1.8 m below the surface of a lake?

    asked on May 7, 2018
  11. Physics

    What is the absolute pressure if the gauge pressure is 100 kPa?

    asked on May 7, 2018
  12. Physics (HELP)

    An object is placed at a distance of 60 cm from a converging lens with a focal length of 20 cm. What is the magnification of the lens?

    asked on April 9, 2018
  13. Chemistry

    The triation of 50.00 mL of 0.025 00 M MES with 0.100 0 M NaOH. MES is a weak acid with pKa=6.27. Compute Ve, first. Show what happens at the four stages of the titration: Va = 0,2,5,10,10.1,11,12, and 12.2 mL. I NEED HELP!!!!

    asked on April 11, 2012
  14. Chemistry

    For each of the following pairs of elements, state whether the binary compound formed is likely to be ionic or covalent. Give the formula and name of the compound. (a) C, Cl Its covalent, but I get the formula wrong and name wrong,CCl Carbon Chloride.

    asked on June 17, 2011
  15. psychology

    We don't just answer questions here. We help. So at least tell us your best thought out answer and why you chose it. Then we'll help. A truck gets stuck under a bridge. Several tow-trucks are unable to pull it ou. At last a little boy walks up and asks the

    asked on March 1, 2007
  16. Chemisrty

    Where can i find drawing of electron dot stuctures for compounds like BR2 and HCN HCN is at the link below. http://dl.clackamas.edu/ch106-01/formulas.htm I couldn't find one for Br2 on line but here is how it will look.   .. .. :Br:Br:

    asked on November 29, 2006
  17. Physics

    What is the absolute pressure if the gauge pressure is 3.2 atm?

    asked on May 7, 2018
  18. Physics

    What is the mass of a rectangular shaped ice block with dimensions of 0.04m x 0.05m x 0.03m if the density of ice is 917 kg/m3?

    asked on May 2, 2018
  19. Physics (HELP)

    An object inside of the focal point of a concave mirror produces an image that is...

    asked on April 5, 2018
  20. math

    Without doing the computation explain why or why not19.7 is a reasonable value for the expression 122.14÷6.2.

    asked on September 1, 2015
  21. College Chemistry

    A gas containing carbon and hydrogen analyzed as 85.6 % carbon and 14.4 % hydrogen. A 42.1 g sample of a gas occupied a volume of 7490 mL with a pressure of 2280.0 torr at 92 °C. Enter the molecular formula of the compound. Thanks.

    asked on May 4, 2012
  22. Chemistry

    Carbon tetrachloride CCl4 contains carbon (EN = 2.5) and chloride (EN = 3.0). Because of this, CCl4 is:

    asked on November 14, 2011
  23. SCIENCE

    Conservation of natural resources could include- A. the use of more renewable sources of energy B. cutting down on the use of fossil fuels C. replacing soil and planting trees D. all of the above

    asked on November 3, 2011
  24. Geometry

    2. Segment RT is the midsegment of the trapezoid. Find x.

    asked on July 11, 2011
  25. Chemistry

    Assume a piece of hot metal is added to a calorimeter containing 50mL of water at 22C. The amount of heat released by the metal was determined to be 1000J, and the equilibrium temperature in the calorimeter was 26C. Remembering that the specific heat of

    asked on June 27, 2011
  26. Chemistry

    Assume a piece of hot metal is added to a calorimeter containing 50mL of water at 22C. The amount of heat released by the metal was determined to be 1000J, and the equilibrium temperature in the calorimeter was 26C. Remembering that the specific heat of

    asked on June 27, 2011
  27. Chemistry

    (a) A sample of cesium metal reacted completely with water, evolving 48.7 mL of dry H2 at 24°C and 774 mmHg. What is the equation for the reaction? Include states-of-matter under SATP conditions in your answer. Use the lowest possible coefficients. (b)

    asked on June 17, 2011
  28. Chemistry

    A particular microwave oven delivers 800 watts. (A watt is a unit of power, which is the joules of energy delivered, or used, per second.) If the oven uses microwave radiation of wavelength 12.2 cm, how many photons of this radiation are required to heat

    asked on June 14, 2011
  29. Chemistry

    What is the energy of a photon corresponding to radio waves of frequency 1.475 106 /s? I got 9.77e-28 as an answer and its wrong so what is wrong with my calculations.

    asked on June 12, 2011
  30. Chemistry

    At what speed must an electron travel to have a wavelength of 13.6 pm? I got 9.89x10^-15 as the answer and its wrong where did I mess up in my calculations?

    asked on June 12, 2011
  31. Chemistry

    The specific heat of copper metal was determined by putting a piece of the metal weighing 39.4 g in hot water. The quantity of heat absorbed by the metal was calculated to be 47 J from the temperature drop of the water. What was the specific heat of the

    asked on June 7, 2011
  32. algebra

    Please help with solving this 5r(6rs-12st)t

    asked on April 19, 2011
  33. chemistry

    Consider the reaction 2Al + 3CuSO4 = Al2(SO4)3 + 3Cu What is the maximum amount of Cu (63.5 g/mol) that could be produced by reacting 20.0 grams of Al (27.0 g/mol) with excess How do i do this?

    asked on November 17, 2010
  34. algebra

    x + 2y = 4 and x - 4y = 8, solve for x

    asked on September 29, 2009
  35. PHYSICS

    A 745i BMW car can brake to a stop in a distance of 122 ft from a speed of 60.0 mi/h. To brake to a stop from a speed of 80.0 mi/h requires a stopping distance of 221 ft. What is the average braking acceleration for the following intervals? Express the

    asked on November 1, 2008
  36. math 1st. grade

    Adding Doubles just means adding the same numberr to itself. Like 2+2=4, 3+3=6, So addind doubles to 18 would be 0+0=0, 1+1=2, 2+2=4, and so forth up to 9+9=18. Maybe this will help you solve the problem. I have a work sheet that has Add Doubles to 18 with

    asked on May 21, 2007
  37. Chemistry

    non-volatile means a liquid that won't evaporate at all. It's not a commomly encountered term because there is usually some evaporation (especially as heat is applied). The usual phrase is "very low volatility". Oil at room temperature or colder fits this

    asked on January 24, 2007
  38. Chemistry

    catalyst: a substance that changes the speed of a chemical reaction without affecting the yield or undergoing permanent chemical change* As you can see NO (nitrogen monoxide) did not undergo a permanent change.

    asked on August 5, 2005
  39. Physics

    A driving bell can withstand a maximum pressure of 2.5 x 10^6 Pa. What maximum depth can the ball reach in seawater?

    asked on May 7, 2018
  40. Physics

    What is the gauge pressure at the bottom of a pool 1.9 m deep?

    asked on May 7, 2018
  41. Physics

    What is the gauge pressure if the absolute pressure is 321 atm?

    asked on May 7, 2018
  42. Physics

    What is the absolute pressure 2.5 m below sea surface?

    asked on May 7, 2018
  43. Physics

    A diver can withstand a maximum pressure of 3x10^5 Pa. What maximum depth can he reach in seawater?

    asked on May 7, 2018
  44. Physics

    A copper cylinder with a cross-sectional area 0.034 m^2 is placed vertically on a tabletop. What is the weight of the cylinder if it exerts an 800 Pa of pressure on the table top?

    asked on May 2, 2018
  45. Math

    If an elliptic race track is 100 yards long and 20 yards wide, then how far apart are the foci?

    asked on April 18, 2018
  46. Physics

    What is the focal length of a lens that has a center of curvature of 18 meters from one of the curves of the lens?

    asked on April 11, 2018
  47. Physics

    What is the focal length if a lens that has a center of curvature 8 meters from one of the curves on the lens?

    asked on April 10, 2018
  48. Physics (HELP)

    An object is placed at a distance of 6 cm from a concave mirror and an image is produced at a distance at a distance of 14 cm from the mirror. What is the focal length?

    asked on April 9, 2018
  49. Physics

    A ray of light perpendicular to a medium produces a refracted ray measuring 45º. * True False

    asked on April 8, 2018
  50. Physics (HELP)

    The critical angle is the angle at which a ray of light is no longer refracted but completely reflected. True or false?

    asked on April 5, 2018
  51. Physics (HELP)

    When light goes from a medium that is less dense to a medium that is more dense, the angle of the refraction is greater than the angle of the incidence

    asked on April 5, 2018
  52. Physics (HELP)

    A real image is usually inverted, but can be upright in special cases. True or false?

    asked on April 5, 2018
  53. Physics (HELP)

    The angle of reflection of a ray of light striking a plane mirror is ½ the angle of incidence. True or False?

    asked on April 4, 2018
  54. Physics (HELP)

    An object is placed at a distance of 25 meters from a concave mirror with a focal length of 20 meters. The image produced is a distance of ___ meters from the mirror.

    asked on April 4, 2018
  55. Physics (HELP)

    An object is placed at a distance of 8 meters from a concave mirror with a focal length of 6 meters. The image produced is a distance of ___ meters from the mirror.

    asked on April 4, 2018
  56. Physics (HELP)

    Jill pulls on a rope to lift a 12 kg pail out of a well, while the clumsy jack watches. For a 10.0 meter segment of the lift, she lifts the bucket straight up at constant speed. How much power is required to complete this task in 5 seconds?

    asked on March 23, 2018
  57. Calculus- Related rates

    A spherical balloon is inflated at the rate of 1 cm^3 per minuter. At the instant when the radius r=1.5, (a.) how fast is the radius increasing? (b.) how fast is the surface area increasing?

    asked on March 1, 2017
  58. Calculus

    The length l of a rectangle is decreasing at the rate of 3cm/sec, while its width w is increasing at the rate of 3cm/sec. Find the rates of change of (1.) the area, (2.) the perimeter, (3.) the length of one diagonal at the instant when l=15 and w=6.

    asked on February 25, 2017
  59. Physics

    A glacier advances at 7 × 10−6 cm/s. How far will it move in 3.7 y? Answer in units of cm. I have calculated that there are 31,449,600 seconds in a year. I multiplied 31,449,600 by 7 × 10−6 and got 2201.472. Then I multiplied that by 3.7 and got

    asked on October 4, 2016
  60. Chemistry

    Sodium + Sulfuric Acid and Phosphoric Acid + Magnesium Hydroxide a.write the formula b. supply the product c.type of reaction d. balancing

    asked on September 11, 2016
  61. Math

    Let f(a,b) = 2a - 3b^2 + 7. If f(b,3) = 90, then what is b? Thank you for helping!

    asked on April 7, 2016
  62. Math

    If 1 < x < 9/8, which is bigger, ∛3x or √2x.

    asked on March 21, 2016
  63. Math haha

    Simplify: ( 7/2+5/6 )^2 - ( 7/2-5/6 )^2

    asked on March 20, 2016
  64. Math

    If 1 > x > 9/8, which is bigger, ∛3x or √2x.

    asked on March 20, 2016
  65. MATH

    I am trying to find the rule for a function table with input 2, output 30; input 3, output 48; input 4, output 66.

    asked on March 18, 2015
  66. physics

    A 78 kg bag of mortar mix is sitting in the back of a truck rounding a traffic circle of radius 27 m at a speed of 21 km/h. Using the truck's frame of reference, find the force of contact between the bag and the side of the truck. Assume that the floor at

    asked on October 11, 2014
  67. Algebra, Logirithms

    Find the inverse of the function: f(x) = e^(4x+2) - 10

    asked on May 5, 2014
  68. Math

    Help Please! The LCM of two numbers is 60. The GCF of the numbers is 5. One number is 5 more than the other. The numbers are________ and __________ Please help clueless in Massachusetts

    asked on February 25, 2014
  69. math

    Brandon and Jacob buy used cars at the same time. Brandon buys a car with 10,000 miles on it. He drives an average of 100 miles a week. The equation that follows can be used to determine how many miles, m, will be on the car after any number of weeks of

    asked on November 13, 2013
  70. Noun and Adjective Clauses

    Amanda bought a prom dress which she considered the most beautiful dress ever made. Adjective clause:Amanda bought a prom dress Word(s) modified:dress

    asked on October 22, 2013
  71. physics

    Find the field produced by a uniformly charged sheet carrying 93pC/cm2 .

    asked on September 3, 2013
  72. Statistics

    The inside diameter of the automobile wheel bearing sets at a factory is expected to be normally distributed with a mean of 1.30inches and a standard deviation of 0.04 inches. What is the probability that a randomly selected wheel bearing will have an

    asked on July 25, 2013
  73. Physics

    Steps for drawing an acceleration time graph from a velocity time graph and vice versa?l Please give me proper steps

    asked on July 10, 2013
  74. math

    Triangle GHI is an isosceles triangle. H is the vertex. If the measure of H is 73 degrees what is the measure of G? A.73 B.17 C.34 D.104 A)73 degrees?

    asked on February 26, 2013
  75. Math

    Triangle ABC is an isosceles triangle If the measure of B is 37 degrees what is the measure of C? A.37 B.53 C.106 D.143 I think it's A or C?

    asked on February 26, 2013
  76. Science

    Why do you think people wrestle alligators?

    asked on February 18, 2013
  77. English

    To assert means to A.put into words forcefully b.pass along stories quickly C.compliment someone often D.explain something completely A?

    asked on February 15, 2013
  78. English

    An incident is a single A. event B.person C.memory D.discussion A?

    asked on February 15, 2013
  79. Analytic Geometry

    A parabola has a directrix y=-3, axis =4 and latus rectum equal to 2. find its equation. Please help me its for my homework

    asked on February 11, 2013
  80. Analytic Geometry

    Find the equation of a circle passing through and tangent to the line x-3y+8=0

    asked on January 25, 2013
  81. Analytic Geometry

    Give the equation of the circle tangent to both axes of radius 5 and in the 1st quadrant. Can you help me solve this?

    asked on January 21, 2013
  82. Analytic Geometry

    What are the equations of the circles tangent to the x-axis, of radius 4 and whose center is at (-2,y) Please help, how do I solve this problem?

    asked on January 21, 2013
  83. Analytic Geometry

    A point is equidistant from (-2,4) and (3,5). It is also equidistant from (-2,-3) and (6,-1). Find the point Please I need Help with this

    asked on January 13, 2013
  84. Analytic Geometry

    A point is equidistant from (-2,4) and (3,5). It is also equidistant from (-2,-3) and (6,-1). Find the point Please I need Help with this

    asked on January 13, 2013
  85. Geometry

    What is the equation of a line through (-2,5) and whose segment intercepted between the axes in the 2nd quadrant is 7sqrt2? Please help me solve this

    asked on January 7, 2013
  86. Math,Geometry

    What are the equations of the lines through (-5,-3) and passing at distance 2sqrt5 from (5,7) Please I really need your help. I do not know how to do this problem.

    asked on January 7, 2013
  87. Math,Geometry

    What are the equations of the lines through (-5,-3) and passing at distance 2sqrt5 from (5,7) Please I really need your help. I do not know how to do this problem.

    asked on January 7, 2013
  88. geometry

    What are the equations of the lines through (-5, -3) and passing at distance 2sqrt5 from (5,7)? This problem is confusing? How do I solve this? Please I need your Help

    asked on January 7, 2013
  89. English

    What's the difference between possessive nouns and possessive pronouns? Are they the same

    asked on December 18, 2012
  90. Grading

    How do you find out what your grade is on a paper? For example if there is 70 questions and you miss 10 how do you find out what your grade is? Do you subtract 70 and 10 and when you get your answer you divide it by 100?

    asked on December 18, 2012
  91. Math

    A highway construction warning sign blinks on and off. In all, the sign is on for 0.88 of each minuite. For how many seconds is the sign on in 5 minutes?

    asked on December 11, 2012
  92. Science

    Define heat in science terms

    asked on December 8, 2012
  93. Science

    You may have heard "Nothing is Free" explain why this is true

    asked on December 1, 2012
  94. Math perimeter

    How many inches of matting are needed to frame an 8in by 11 in print? 38?

    asked on November 7, 2012
  95. math

    How many inches of matting are needed to frame an 8 in by 11 in print 38in?

    asked on November 7, 2012
  96. Math

    When finding the perimeter you have to add the sides not multiply right? For example a rectangle is 14 width and 29 height would the perimeter be 86in?

    asked on November 7, 2012
  97. physics

    You see an optical illusion of an ever-upward spiral staircase. The climber trudges up and up and never gets anywhere, going in circles instead. Suppose the staircase is provided with a narrow ramp, allowing the tired stair-climber to push a wheelbarrow up

    asked on November 4, 2012
  98. Maths

    Three boys shared some cards. Peter had twice as many cards as Farid. The ratio of the number of cards Peter had to the number of cards Kiran had was 6:5. Farid gave 2/3 of his cards to Peter and the rest to Kiran. How many cards did Kiran have at first if

    asked on October 24, 2012
  99. Finite Math- help wanted. Super hard!

    In a past presidential election, it was estimated that the probability that the Republican candidate would be elected was 2/3, and therefore the probability that the Democratic candidate would be elected was 1/3 (the two Independent candidates were given

    asked on October 16, 2012
  100. math

    An airplane flying against the wind travels 100 miles in the same amount of time it would take the same plane to travel 140 miles with the wind. If the wind speed is a constant 40 miles per hour, how fast would the plane travel in still air?

    asked on October 10, 2012

Pages

  1. 1
  2. 2