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

    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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. Algebra

    How can you use an equation to make a prediction from a pattern. I think that you can do based on the pattern giving you a base of probability to forecast with a reasonable degree of confidence something in the future.I would think that your degree of

    asked on August 27, 2014
  15. 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
  16. 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
  17. AP Chemistry

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

    asked on October 28, 2007
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  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

    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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. geometry

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

    asked on March 20, 2012
  36. 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
  37. 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
  38. 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
  39. spanish

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

    asked on October 26, 2010
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. physics

    A 920 g empty iron kettle is put on a stove. How much heat in joules must it absorb to raise its temperature form 15.0° C to 93.0° C? (The specific heat for iron is 113 cal/kg · °C.)(1 cal = 4.184 J)

    asked on January 22, 2013
  51. chemistry

    2.241 g sample of nickel combines with oxygen to produce 2.852 g of metal oxide. Calculate the number of grams of xygen in the metal oxide.

    asked on March 17, 2015
  52. 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
  53. 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
  54. 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
  55. Physics

    Answer True or False to each case. Coulomb's law states that the force between static charges Q1 and Q2 is proportional to Q1 Q2. is proportional to the total charge Q1+Q2. is K Q1Q2/r where K is a universal constant. is proportional to 1/r2. is a force of

    asked on July 9, 2015
  56. 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
  57. 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
  58. 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
  59. 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
  60. chemistry 105

    Complete and balance each of the following equations for gas-evolutions. Express answer as a chemical equation. Identify all the phases in your answer. HCl(aq)+K2SO3(aq)--> HCl(aq)+KHCO3(aq)--> HC2H3O2(aq)+NaHSO3(aq)--> (NH4)2SO4(aq)+KOH(aq)-->

    asked on October 10, 2011
  61. 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
  62. 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
  63. English

    All sentences in a paragraph must relate to the idea that the topic sentence in the paragraph introduces. 1.True 2. False I say true. Please recheck my answer.

    asked on July 16, 2016
  64. 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
  65. 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
  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. 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
  68. Physical Science

    A rock thrown straight up climbs for 2.50 s,the falls to the ground. Neglecting the air resistance, with wat velocity did the rock strike the ground?

    asked on March 6, 2010
  69. math

    hello, i have some question about rational functions. 1) are there any sites that are good in teaching graphing rational functions? 2) for the domain of the rational function it is what the denominator cannot equal to rite? for example the denominator of

    asked on October 23, 2007
  70. 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
  71. 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
  72. Physics

    I've got a few questions. I'll show my work but I'm struggling and need to turn in this homework by midnight :( 1) Calculate g (the acceleration due to gravity) for the space shuttle’s orbit, 200 km above the Earth’s surface. M= 5.98x10^24kg (given on

    asked on July 24, 2019
  73. 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
  74. 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
  75. chemistry

    What is the is product of Nickel(II) nitrate+sodium phosphate This is what I have: Ni(NO3)2+Na3PO4----> can you help me on the resultant equation please

    asked on January 8, 2008
  76. 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
  77. 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
  78. 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
  79. Math

    A square garden plot measures 180 square feet. A second square garden plot measures 405 square feet. How many more feet of fence will the second garden plot require over that required for the first garden plot. But how did they get this???????

    asked on June 17, 2012
  80. statistics

    A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. State the hypotheses to test whether the mean transaction time exceeds 50 seconds.

    asked on October 5, 2010
  81. 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
  82. newton's method #2

    i want to verify that when newton's method is used to compute sqrt(R) (by solving the equation x^2=R), the sequence o iterates is defined by x_(n+1)=.5(x_(n) + (R/x_(n))

    asked on September 28, 2008
  83. 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
  84. 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
  85. interest

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

    asked on April 17, 2016
  86. 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
  87. ap chem

    P4 + F2 = PF3 What mass of F2 is needed to produce 120 gm of PF3, if the reaction has 81.1 % yield?

    asked on October 10, 2011
  88. 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
  89. 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
  90. 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
  91. Science

    Why is pseudo science not considered real science

    asked on September 22, 2019
  92. 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
  93. 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
  94. interest

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

    asked on April 17, 2016
  95. Physics 1

    A block is given an initial velocity of 9.00 m/s up a frictionless incline of angle θ = 21.0°. How far up the incline does the block slide before coming to rest?

    asked on September 25, 2014
  96. algebra

    how many different pizzas can be made if a pizza shop has 6 meat toppings, 5 vegetable toppings, and 3 cheese toppings to choose from using 1 of each on each pizza?

    asked on April 6, 2010
  97. 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
  98. physics

    You would like to shoot an orange out of a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. On your first try, you fire the arrow at 36.0 m/s at an angle of 30.0° above the horizontal from a height of 1.40 m while standing 41.0

    asked on February 17, 2014
  99. accounting

    A review of the ledger of Terrell Company at December 31, 2012, produces these data pertaining to the preparation of annual adjusting entries. 1. Prepaid Insurance $18,279. The company has separate insurance policies on its buildings and its motor

    asked on October 2, 2012
  100. 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


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