Most popular questions and responses by julie
  1. chemistry 105

    Lithium reacts with nitrogen gas according to the following reaction: 6Li(s)+N2(g)-->2LiN(s) What mass of lithium (in g ) is required to react completely with 59.9 mL of N2 gas at STP?

    asked on October 23, 2011
  2. math

    The volume of a pyramid varies jointly with the base area of the pyramid and its height. The volume of one pyramid is 24 cubic inches when its base area is 24 square inches and its height is 3 inches. What is the volume of a pyramid with a base area of 10

    asked on November 15, 2014
  3. algebra

    you are buying orange juice for $4.50 per container and have a gift card worth $7. TheFunction f(x)=4.50x-7 represents your total cost f(x) if you buy x containers of orange juice and use the gift card. How much do you pay to buy 4 containers of orange

    asked on November 2, 2015
  4. Chemistry

    Given that E^o = 0.52 V for the reduction of Cu+(aq) + e - (yields) Cu(s) Calculate E^o, (delta)G^o and K for the following reaction at 25°C. 2Cu2+(aq) (yields) Cu2+(aq) + Cu(s)

    asked on May 11, 2010
  5. Algebra

    Divide the rational expression. Express the quotient as a rational expression in lowest terms. (x^2+10x+21)/(x^2+11x+28) ÷ (x^2+3x)/(x^2+11x+28) (i really need to know the steps on how to do this (please just don't give me the answer i already know it)

    asked on July 8, 2010
  6. English

    7. After he is wounded in Act III, Scene 1, Mercutio says to Romeo, "Why the devil came you between us? I was hurt your arm." Which of the following is the best paraphrase of Mercutio's words? a. I am so badly wounded that I feel I will die. b. Why did you

    asked on March 10, 2017
  7. science: chemistry

    How many moles of NaOH must be added to 1.0 L of 2.6 M HC3H5O3 to produce a solution buffered at each pH? 1)pH= 4.28 2)pH=pKa

    asked on July 23, 2015
  8. Chemistry

    Calculate the rms speed of Br2 molecules at 23 °C and 1.00 atm. What is the rms speed of Br2 at 23 °C and 1.50 atm?

    asked on February 19, 2015
  9. Chemistry 105

    The air in a bicycle tire is bubbled through water and collected at 25 C. If the total volume of gas collected is 5.65 L at a temperature of 25 C and a pressure of 729 torr, how many moles of gas was in the bicycle tire?

    asked on October 23, 2011
  10. Chemistry

    Calculate E, E^o and (delta)G^o for the following cell reaction: Mg(s) + Sn2+(aq) (yields) Mg2+(aq) + Sn(s) [Mg2+] = 0.045 M, [Sn2+] = 0.035 M

    asked on May 11, 2010
  11. physics

    A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 2.00 cm, and the toy is released. If the toy has a mass of 105 g and rises to a maximum height of 75.0 cm, estimate the force

    asked on January 11, 2011
  12. Chemistry 105

    Ozone is depleted in the stratosphere by chlorine from CF3Cl according to the following set of equations: CF3Cl+UV light-->CF3+Cl Cl+O3-->ClO+O2 O3+UV light-->O2+O ClO+O-->Cl+O2 What total volume of ozone measured at a pressure of 22.0 mmHg and a

    asked on October 23, 2011
  13. chemistry 11

    Food manufacturers sometimes add calcium acetate to puddings and sweet sauces as a thickening agent. What volume of 0.500 mol/L calcium acetate, Ca(CH3COO)2 (aq), contains 0.300 mol of acetate ions? So I've been over this a hundred times and I still can't

    asked on December 17, 2014
  14. Math

    Isaac throws an apple straight up (in the positive direction) from 1.0 m above the ground, reaching a maximum height of 35 meters. Neglecting air resistance, what is the ball’s velocity when it hits the ground?

    asked on April 18, 2016
  15. chemistry

    3CuCl2 *2H2O + 2Al = 3Cu + 2AlCl3 + 6H2O Determine the number of grams that should have been produced when 1.25g of copper (2) chloride dehydrate reacts with excess aluminum so i'm not really sure how you're supposed to calculate the number of grams with

    asked on November 27, 2014
  16. Physical Science

    How many meters away is a cliff if an echo is heard 0.500 s after the original sound? Assume that sound traveled at 343 m/s on that day.

    asked on March 6, 2010
  17. AP Chemistry

    Finish the equation: Solutions of zinc sulfate and sodium phosphate are mixed

    asked on October 28, 2007
  18. spanish

    for homework we have to unscramble these words: lcpoa, maidolrg, caluphin, masarac, patneon, pelpa padcoi can anyone help?

    asked on October 26, 2010
  19. History--Correct 1 question please? :)

    Which statement below best describes Cincinnatus and Julius Caesar? A. Both men put the welfare of the Roman Republic above their own personal success and both obeyed the Senate in time of crisis. B. Cincinnatus accepted the role of dictator in a crisis

    asked on March 13, 2014
  20. Math

    Sam needs to cut a piece of sheet metal into 8 pieces. All the cuts are made in the same direction. It takes him 5 minutes to make each cut. How many cuts will Sam make? How would making a table help you find the number of minutes it took Sam to cut the

    asked on February 14, 2013
  21. chem

    How many moles of carbon are needed to react with 525 g of hematite 2FeO3+6C->4Fe+3Co2 idk how to convert moles of fe2o3 to carbon

    asked on September 29, 2013
  22. physics

    A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 19.0{\rm cm} , giving it a charge of -13.0\mu {\rm C} Find the electric field just outside the paint layer. Find the electric field 8.50{\rm cm} outside

    asked on February 1, 2013
  23. physics

    A hot iron horseshoe (mass = 0.43 kg), just forged (Fig. 14-16), is dropped into 1.60 L of water in a 0.26 kg iron pot initially at 20°C. If the final equilibrium temperature is 26°C, estimate the initial temperature of the hot horseshoe. Could someone

    asked on April 23, 2012
  24. physics help please...

    A light spring of constant k = 170 N/m rests vertically on the bottom of a large beaker of water. A 5.70 kg block of wood (density = 650 kg/m3) is connected to the spring and the mass-spring system is allowed to come to static equilibrium. What is the

    asked on December 20, 2010
  25. Production/Operations Management

    Here is a list of activity times for a project as well as crashing costs for its activities. Determine which activities should be crashed and total cost of crashing if the goal is to shorten the project by three weeks as cheaply as possible. First

    asked on December 1, 2018
  26. Chemistry 105

    A sample of N20 gas has a density of 2.65 g/L at 298 K. What must be the pressure of the gas (in mmHg )?

    asked on October 23, 2011
  27. pre calc

    Two forces of 50 and 70 N (newtons) act on an object. The angle between the forces is 40°. Find the magnitude of the resultant and the angle that it makes with the smaller force.

    asked on April 7, 2008
  28. Science

    How are the respiratory and circulatory and respiratory systems similar? A) Both systems provide glucose and other substances to cells. B) Both systems regulate blood flow throughout the body. C) Both systems help remove carbon dioxide from the body. D)

    asked on March 30, 2018
  29. Trigonometry

    Outside temperature over a day can be modeled as a sinusoidal function. Suppose you know the high temperature of 95 degrees occurs at 3 PM and the average temperature for the day is 80 degrees. Find the temperature, to the nearest degree, at 8 AM

    asked on November 1, 2016
  30. Math 6th Grade

    A deep-sea diver must descend and ascend in short steps to equalize pressure on his body. If the diver rises toward the surface too fast, he may suffer from a physical condition called "the bends". Suppose the diver started at 82 feet below the surface and

    asked on March 28, 2018
  31. Chemistry

    Elemental calcium is produced by the electrolysis of molen CaCl2. What mass of calcium can be produced by this process if a current of 8500 A is applied for 39 h? Assume that the electrolytic cell is 65% efficient. I found the mass to equal 1.6 x10^5g Ca,

    asked on November 18, 2009
  32. History

    Mark the statement if it describes Roman society during Julius Caesar’s time. A. Wealthy individuals owned and controlled most of the land. B. Few people were living in the cities. C. The government of Rome was corrupt. D. Civil war broke out. E. Romans

    asked on March 13, 2014
  33. science physics

    Two locomotives approach each other on parallel tracks. Each has a speed of v = 95 km/h with respect to the ground. If they are initially d = 7.5 km apart, how long will it be before they reach each other?

    asked on October 6, 2010
  34. physics

    A passenger on an interplanetary express bus traveling at = 0.95 takes a 9.0-minute catnap, according to her watch.How long does her catnap from the vantage point of a fixed planet last?

    asked on August 10, 2012
  35. geometry

    What's the next number 360, 180, 60, 15...?

    asked on March 20, 2012
  36. interest

    Find the balance on an account if you invest $100 at 5% for 10 years compounded monthly.

    asked on April 17, 2016
  37. chemistry 105

    A 260-mL flask contains pure helium at a pressure of 743 torr. A second flask with a volume of 480 mL contains pure argon at a pressure of 715 torr. If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure

    asked on October 23, 2011
  38. physics

    How much work is done on a bookshelf being pulled 5.00m at an angle of 37.0 degrees from the horizontal? The magnitude of the component of the force that does the work is 43.0N

    asked on May 24, 2010
  39. maximizing profit calculus

    During the summer months Terry makes and sells necklaces on the beach. Last summer he sold the necklaces for $10 each and his sales averaged 20 per day. When he increased the price by $1, he found that he lost two sales per day. a. Find the demand

    asked on November 11, 2007
  40. Chemistry

    State whether each of the following aqueous solutions would be acidic, basic, or neutral. Include appropriate net-ionic equations to show why a given solution is acidic or basic. a) NaNO3 b)KC6H5CO2 c)50:50 mixture of C6H5CO2H+KC6H5CO2 d)(CH3NH3)Cl e)50:50

    asked on March 13, 2010
  41. Math

    Omar's current annual salary is $75,000. How much will he need to earn 15 years from now to retain his present purchasing power if the rate of inflation over that period is 2%/year? Assume that inflation is continuously compounded.

    asked on November 18, 2016
  42. Chemistry

    A lab assistant prepared a potassium chloride solution for her class by dissolving 5.34 g of KCl in 152g of water. What is the mass percent of the solution she prepared? Could you help me set this up/show me how to do this problem?

    asked on April 29, 2011
  43. english

    Please tell me if I should use to or too in the following sentence: Anthony knew all (to, too) well that he shouldn't have eaten a third piece of lasagna.

    asked on October 19, 2010
  44. Math

    What is the final price of a $24 sweatshirt if there is a 20% discount applied and then a 7% sales tax added?

    asked on February 5, 2016
  45. physics

    A positively charged glass rod is brought close to a neutral sphere that is supported on a nonconducting plastic stand. Sketch the distribution of charges on the sphere if it is made of: a) Aluminum b) Non-conducting plastic

    asked on January 31, 2013
  46. 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 on March 7, 2012
  47. physics

    The figure below shows a test charge q between the two positive charges. Find the force (in newtons) on the test charge for q = 1 µC. Give a positive answer if the force is to the right and a negative answer if the force is to the left.

    asked on January 27, 2009
  48. Chemistry

    Elemental calcium is produced by the electrolysis of molen CaCl2. What mass of calcium can be produced by this process if a current of 8500 A is applied for 39 h? Assume that the electrolytic cell is 65% efficient. I found the mass to equal 1.6 x10^5g Ca,

    asked on November 15, 2009
  49. math

    Find all integers x for which there exists an integer y such that 1/x + 1/y = 1/7. I'm not exactly sure how to approach this problem. Please answer as soon as possible.

    asked on December 24, 2018
  50. Chemistry

    **When 0.187 g of benzene,C6H6, is burned in a bomb calorimeter, the surrounding water bath rises in temperature by 7.48 C. ** Assuming that the bath contains 250.0 g of water and that the calorimeter itself absorbs a negligible amount of heat, calculate

    asked on February 17, 2010
  51. science: chemistry

    A buffered solution is made by adding 47.4 g C2H5NH3Cl to 1.00 L of a 0.68 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)

    asked on July 23, 2015
  52. interest

    Find the balance on an account if you invest $100 at 5% for 10 years compounded annually.

    asked on April 17, 2016
  53. English

    I am doing a project on Frankenstein and we have a quote "My vices are the children of a forced solitude that I abhor, and my virtues will neccesairly arise when I live in communion with an equal" I am having a hard time understanding what it means. I have

    asked on August 30, 2007
  54. Math

    a student answered 86 problems on a test and got a 98%. How many problems were on the test?

    asked on November 21, 2016
  55. Physics

    A baseball thrown at an angle of 55.0 degrees above the horizontal strikes a building 16.0 m away at a point 8.00 m above the point from which it is thrown. Ignore air resistance. Find the magnitude of the initial velocity of the baseball (the velocity

    asked on September 19, 2006
  56. chemistry

    Consider the following system, which is at equilibrium, 3C(s) + 3 H2(g) mc020-1.jpg CH4(g) + C2H2(g) The result of removing some C(s) from the system is that a) more CH4(g) and C2H2(g) are produced to replace that which is removed. b) Kc decreases. c) more

    asked on May 11, 2014
  57. Calculus

    A stone is dropped from the edge of a roof, and hits the ground with a velocity of -145 feet per second. How high (in feet) is the roof

    asked on July 22, 2011
  58. Math

    It takes a plane 40 minutes longer to fly from Boston to Los Angeles at 525 miles per hour than it does to return at 600 miles per hour. How far apart are the cities?

    asked on November 23, 2007
  59. Math

    A round silo is 55 feet tall and has a 18 foot radius. How high would a load of 31000 cubic feet of grain fill the silo?

    asked on October 7, 2015
  60. physic

    a resistor has a voltage of 6.65 V and a current of 4.45 A. it is placed in a calorimeter containing 200g of water at 24 degree Celsius. the calorimeter is aluminum (specific heat= 0.220 cal/g-Celsius), and its mass is 60g. the heat capacity of the

    asked on February 26, 2013
  61. physics

    A projectile is launched from the ground level to the top of a cliff which is 195m away and 135m high. If the projectile lands on the top of the cliff 6.6s after it is fired, find the initial velocity of the projectile( magnitude and direction). Neglect

    asked on October 26, 2018
  62. Calculus

    The circumference of a sphere was measured to be 74.000 cm with a possible error of 0.50000 cm. Use linear approximation to estimate the maximum error in the calculated surface area

    asked on July 20, 2011
  63. physics

    The New River Gorge bridge in West Virginia is a 518 m long steel arch. How much will its length change between temperature extremes -19°C and 39°C? (answer in cm)

    asked on November 30, 2009
  64. pre calc

    The velocity of an aiplane heading east at 400 knots and a wind velocity of 50 knots northeast. The airplane encounters this wind, show the resultant velocity. What is the resulant speed and direction of the airplane? (the direction is the angle the

    asked on March 31, 2008
  65. CHEMISTRY 122

    The spectrophotometer was used to measure the abosrbance of each of a series of [FeSal]+ solutions. A standard curve was constructed by plotting the absorbance vs. concentration (M). The slope and y-intercept were found to be 1517 M-1 and 0.001,

    asked on March 29, 2018
  66. chemistry 105

    Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)-->Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.7 g. What minimum mass of H2SO4(in g) would you need? What mass of H2

    asked on October 10, 2011
  67. physics

    A commuter train passes a passenger platform at a constant speed of 40.0 m/s. The train horn is sounded at its characteristic frequency of 320 Hz. What overall change in frequency is detected by a person on the platform as the train moves from approaching

    asked on January 28, 2011
  68. math

    Marisa invests $1650 for 3 years, at which time her investment is worth $2262.7. What interest rate , compounded annually, would yield the same results? Found your answer to 2 decimal places.

    asked on January 13, 2016
  69. chemistry 105

    Consider the following reaction: Li2S(aq)+Co(NO3)2(aq)-->2LiNO3(aq)+CoS(s) What volume of 0.150 M Li2S solution is required to completely react with 125 mL of 0.150 M Co(NO3)2?

    asked on October 10, 2011
  70. math

    Phillip, the proprietor of a vineyard, estimates that the first 9600 bottles of wine produced this season will fetch a profit of $5 per bottle. However, the profit from each bottle beyond 9600 drops by $0.0002 for each additional bottle sold. Assuming at

    asked on November 20, 2012
  71. physics

    A small boat is headed a harbor 32km directly northwest of its current position when its suddenly engulfed in heavy fog. The captain maintain a compass bearing of northwest and a speed of 10km/h relative to the water.The fog lift 3.o h later and the

    asked on October 8, 2009
  72. chemistry

    order from smallest to biggest 10g , 100mg , 0.1kg 1km ,100m , 1000cm

    asked on February 4, 2019

    Suppose that at least 13.0 eV is needed to free an electron from a particular element, i.e., to ionize the atom. What is the lowest frequency photon which can accomplish this? And, what is the corresponding wavelength for that photon? Give frequency for

    asked on August 10, 2015
  74. Economics

    got this from my teacher, A monopolist faces a demand curve given by the following equation: P = $500 − 10Q, where Q equals quantity sold per day. Its marginal cost curve is MC = $100 per day. Assume that the firm faces no fixed cost. and have the

    asked on May 7, 2013
  75. Chemistry 105

    A gas mixture with a total pressure of 745 mmHg contains each of the following gases at the indicated partial pressures: CO2, 257 mmHg; Ar, 123 mmHg; and O2, 160 mmHg. The mixture also contains helium gas. What is the partial pressure of the helium gas?

    asked on October 23, 2011
  76. Chemistry

    How much energy (in kilojoules) is required to convert 280mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL? Its heat of vaporization is +26.5 kJ/mol at its boiling point.

    asked on February 16, 2010
  77. Geometry

    Can I get help starting this exercise:- Let triangle ABC be such that AB is not congruent to AC. Let D be the point of intersection of the bisector of angle A and the perpendicular bisector of side BC. Let E, F, and G be the feet of the perpendicular

    asked on October 20, 2009
  78. Math

    in the problem 15 + 37=52, show how to make ONE addend the next tens number. Complete the new addition sentence __+__=__????

    asked on October 9, 2013
  79. chemistry

    Calculate the pH of a solution prepared by mixing 25.0 mL of 0.60 M HC2H3O2 and 15.0 mL of 0.60 M NaOH?

    asked on May 6, 2010
  80. Chemistry 105

    A heliox deep-sea diving mixture contains 2.0 g of oxygen to every 98.0 g of helium. What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 9.3 atm?

    asked on October 23, 2011
  81. Chemistry

    I need to find out what the total acid concentration is in Kool-Aid. If 23.3 mL of 0.1043M NaOH neutralize a 60 mL solution of Kool-Aid (10 mL) and water (50 mL), what is the total concentration in a 10.00 mL aliquot of Kool-Aid? If you prepared a standard

    asked on February 15, 2011
  82. to writ teacher

    Life after College Caitlin Petre is a graduate from Stanford University. She graduated with a 3.90 GPA with a Master’s degree in Philosophy. One day after graduation, Petre went for an interview for a job and she was asked to fill out a W-4 form. When

    asked on November 28, 2007
  83. English

    In the following sentence can you tell me what is the direct object? On it, there are chickens and cows, I don't raise sheep. my answer is raise is that correct?

    asked on March 27, 2019
  84. chemistry

    if 25.0 ML of 15M nitric acid is diluted to 125 mL, what is the concentration of the new solution?

    asked on April 20, 2010
  85. music appreation

    Writing Assignment: What musical form preceded the sonata allegro form? This form is often considered dramatic and rewarding. In what way is this so and why? Refer to the listening examples to help make your point.

    asked on November 20, 2009
  86. CHEMISTRY 122

    The spectrophotometer was used to measure the abosrbance of each of a series of [FeSal]+ solutions. A standard curve was constructed by plotting the absorbance vs. concentration (M). The slope and y-intercept were found to be 1517 M-1 and 0.001,

    asked on April 1, 2018
  87. chemistry, first year university

    Solid NH4N3 decomposes explosively according to the following equation: NH4N3(s) ⇌ 2N2(g) + 2H2(g) A small amount of ammonium azide was placed in a sealed container and the air was removed. The sample was then detonated. At equilibrium the total pressure

    asked on May 11, 2014
  88. Chemistry

    The Cu2+ ions in this experiment are produced by the reaction of 1.0g of copper. Information already found out .016 mol Cu2+ produced Overall reaction is Cu2+(aq)+Cl-(aq)+Cu(s)=2 CuCl(s) Maximum mass of CuCl that can be prepared from the reaction sequence

    asked on October 23, 2012
  89. Finance

    Use the following financial statements for Lake of Egypt Marina, Inc. LAKE OF EGYPT MARINA, INC Balance Sheet as of December 31, 2012 and 2011 (in millions of dollars) 2012 2011 2012 2011 Assets Liabilities and Equity Current assets: Current liabilities:

    asked on September 9, 2012
  90. Physics

    Monochromatic light of wavelength, λ is traveling in air. The light then strikes a thin film having an index of refraction n1 that is coating a material having an index of refraction n2. If n2 is larger than n1, what minimum film thickness will result in

    asked on August 6, 2015
  91. math

    a function grows exponentially at a rate of 10%. If the value at t=2 is 908.56 what is the value of (a) in the formula: f(x)=a.b(x)

    asked on May 16, 2013
  92. geometry

    An equilateral triangle has sides that measure 5x+3 units and 7x-5 units. What is the perimeter of the triangle?

    asked on November 8, 2011
  93. chemistry

    Calculate the pH of a solution prepared by mixing 25.0 mL of 0.60 M HC2H3O2 and 15.0 mL of 0.60 M NaC2H3O2?

    asked on May 6, 2010
  94. Physical Science

    A cubic tank holds 1,000.0 kg of water. What are the dimensions of the tank in meters? Explain your answer.

    asked on March 6, 2010
  95. physics

    If a hair dryer is rated at 800W, how much energy does it require in 3 min?

    asked on February 18, 2009
  96. Calculus

    The voltage signal from a standard european wall socket can be described by the equation V(t) = 325Sin100(pie)t, where t is time in seconds and v is voltage at time t A) find the maximum and minimum voltage levels and times at which they occur B) determine

    asked on April 14, 2012
  97. English

    A topic sentence should be very long. 1. True 2. False Please recheck my answer. I say True

    asked on July 16, 2016
  98. Medical Coding

    A 12-year-old boy presents with his father to the ER due to open wounds to his arm' hand, and upper leg. The injury occurred when the boy fell on a barbed-wire fence at the farm while running. Diagnosis: Multiple open wounds to the right forearm, right

    asked on January 13, 2013
  99. statistics

    Suppose that, for students who are enrolled in college algebra, 73 percent are freshmen, 48 percent are female, and 31 percent are female and are freshmen. Your answers below should be entered as decimals and rounded to three decimal places. Two students

    asked on March 19, 2012
  100. math help

    An engineer is required to survey a nonrectangluar plot of land but is unable to measure side UT directly. The followng data are taken; RU=130 meters, RS=12m ST=90m, angle RST=115, and angle RUT=100. Calculate the length of side UT and the area of the

    asked on January 12, 2008


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