Questions Asked on
March 3, 2012

  1. chem 2

    A buffer is prepared by adding 300.0mL of 2.0M NaOH to 500.0mL of 2.0M CH3COOH. What is the pH of this buffer? ka=1.8x10-5

    asked by tina
  2. Trig

    prove (cscx-secx/cscx+secx)=(cotx-1/cotx+1)

    asked by Bud
  3. Calculus

    A sporting goods store sells 100 pool tables per year. It costs $20 to store one pool table for a year, based on the average inventory on hand. It costs $40 for each delivery of pool tables. How many times per year and in what lot size should the store

    asked by Casey
  4. physics

    Rank the average gravitational forces from greatest to least between:A. Sun and Mars.B. Sun and the Moon.C. Sun and Earth. i answer b,c,a and its wrong

    asked by Christie
  5. Chemistry

    Write the dissociation reaction and the corresponding Ka equilibrium expression for each of the following acids in water. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer. Omit water in your answer.) (a)

    asked by Chris
  6. physics

    If you pull one end of the rope 1.0 m downward with a 50 N force, find the height you can lift a 150 N load.

    asked by Mrs G
  7. physics

    Emily holds a banana of mass m over the edge of a bridge of height h. She drops the banana and it falls to the river below. Use conservation of energy to find the speed of the banana just before hitting the water.Express your answer in terms of some or all

    asked by Mrs G
  8. AP CHEMISTRY

    A 1.00-L solution saturated at 25°C with lead(II) iodide contains 0.54 g of PbI2. Calculate the solubility-product constant for this salt at 25°C.

    asked by DAN
  9. Math

    Did you hear about the novice water polo player who..??

    asked by Jar
  10. AP CHEMISTRY

    A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of

    asked by MARY
  11. chem 2

    What is the pH of a solution that consists of 0.50M H2C6H6O6(ascorbic acid) and 0.75M NaHC6H6O6(sodium ascorbate)? for ascorbic acid, Ka=6.8x10-5

    asked by tom
  12. chemistry

    please help solve this problem now. I really need an answer. thank you When one mole of KOH is neutralized by sulfuric acid, q=-56kJ. At 22.8 C , 25.0 mL of 0.500 M H2SO4 is neutralized by 50.0 mL of 0.500 M KOH in a coffee-cup calorimeter. What is the

    asked by ogi
  13. algebra

    the pressure (p) that a 160-pound person's shoe exerts on the ground when walking varies inversely with area (a) of the sole of the shoe. when the shoes have a sole area of 40 sq. in., the pressure is 4 pounds per sq. in. what is the sole area of the sole

    asked by bobby
  14. physics

    If the zero level is a distance 2h/3 above the floor, what is the potential energy U of the block on the floor? Express your answer in terms of some or all the variables m, v, and h and any appropriate constants.

    asked by Mrs G
  15. Physics

    The atmospheric pressure above a swimming pool changes from 755 to 765mm of mercury.The bottom of the speed is a 12m x 24m rectangle.By how much does the force on the bottom of the pool increase?

    asked by Scibe
  16. Chemisty

    How many grams of c6h12o6 are needed to form 7.50g of c2h5oh

    asked by Winnie
  17. Chemistry(Please check answer)

    2NO(g) + Br2(g) -> 2NOBr(g) What is the rate equation? My answer is k[NO]2[Br2] Is this correct? Thank you!!!!

    asked by Hannah
  18. physics

    In a game of pool, the cue ball strikes another ball initially at rest. After the collision, the cue ball moves at 4.15 m/s along a line making an angle of -25° (i.e. below the x-axis) with its original direction of motion (the x-axis), and the second

    asked by Katie
  19. physics

    In raising a 4000-N piano with a pulley system, the workers note that for every 1.6 m of rope pulled downward, the piano rises 0.22 m.Ideally, find the force that is required to lift the piano.

    asked by Mrs G
  20. College Chem 2

    calculate the solunility of silver chromate, Ag2CrO4, in 0.005 M NA2CrO4- Ksp=2.6x10-12 Please help.....

    asked by Deb
  21. chem 2

    a buffer is to be prepared by adding solid sodium acetate to 0.10M CH3COOH. Which othe following concentrations of sodium acetate will produce the most effective buffer? A. 3.0M CH3COONa B 2.5M CH3COONa C 2.0M CH3COONa D 1.5M CH3COONa E .30M CH3COONa HELP

    asked by Noah
  22. Mathematics__Please help

    $M is just sufficient to pay for the wages of one qualified teacher for x days or the wages of one relief teacher for y days. For how many days will $M be sufficient to pay for the wages of one qualified teacher and one relief teacher? Give your answer in

    asked by Marie
  23. Chemistry(Please check)

    The equilibrium constant, Kc for the system, CaO(s) + CO2(g) == CaCO3(s), is A. Kc = (CaO) (CO2) / (CaCO3) B. Kc = (CO2) C. Kc = (CaCO3)/(CaO) D. Kc = (CaCO3) / (CaO) (CO2) E. Kc = 1 / (CO2) My answer is (CaCo3) / (CaO)(CO2). Would you agree?

    asked by Hannah
  24. Science

    A small bowl contains a mixture of toothpicks and glass marbles.The easiest way to separate the mixture without touching it would be to A.add glue to the mixture B.place a magnet in the bowl C.pour the mixture into a paper cone D.add water to the bowl B?

    asked by running.from.myself
  25. Chemistry

    during a molar volume of oxygen experiment indicate how each of the following errors would affect (increase, decrease, or no change) your calculated value for the molar volume of O2 at STP. 1.) Your sample was not completely decomposed. 2.) After you

    asked by Anne
  26. chemistry

    Nitroglycerin is a powerful explosive, giving four different gases when detonated.2 C3H5(NO3)3 (l) → 3 N2 (g) + 1/2 O2 (g) + 6 CO2 (g) + 5 H2O (g)Given that the enthalpy of formation of nitroglycerin, ΔHf°, is −364 kJ/mol, calculate the energy (heat

    asked by ogi
  27. physics

    A 4-m wooden platform weighing 160 N is suspended from the roof of a house by ropes attached to its ends. A painter weighing 640 N stands 1.2 m from the left-hand end of the platform. Find the tension in each of the ropes

    asked by joy
  28. english

    Jack Kerouac gave the Beat Generation their name because he claimed that his generation of writers was beaten down by (pick one) materialism. politics. religion. traditionalism.

    asked by LAYLA
  29. chemistry

    How much heat is evolved or absorbed in this problem? Question Details Limestone, CaCo3, when subjected to a temperature of 900 degrees Celsius in a kiln, decomposes to calcium oxide and carbon dioxide. How much heat is evolved or absorbed when one gram of

    asked by Anonymous
  30. Algebra 2

    On some tubes of caulking, the diameter of the circular nozzle opening can be adjusted to produce lines of varying thickness. The table shows the length l of caulking obtained from a tube when the nozzle opening has diameter d and cross-sectional area A.

    asked by Erica
  31. physics

    If a trapeze artist rotates once each second while sailing through the air and contracts to reduce her rotational inertia to one-third of what it was, how many rotations per second will result?

    asked by Christie
  32. PHYSICS

    A physics book slides off a horizontal table top with a speed of 1.15 . It strikes the floor after a time of 0.360 . Ignore air resistance.Find the horizontal component of the book's velocity just before the book reaches the floor.

    asked by WASEEQ
  33. physics

    disregard the previous I did not include the first part This question is typical on some driver's license exams: A car moving at 50 km skids 15 m with locked brakes.How far will the car skid with locked brakes at 120 km/h?

    asked by Mrs G
  34. Chem Acids/Bases

    A 25.00 mL sample of H3PO4(aq) requires 31.05 mL of 0.2410 M KOH for titration to the second equivalence point. What is the molarity of the H3PO4(aq)?

    asked by Chris
  35. College Chem 2

    which of the following has the highest buffer capacity? A 0.10M H2PO4-/0.10M HPO4 -2 B 0.50 M H2PO4-/0.10 M HPO 2- C 0.10 M H2PO4-/0.50 M HPO4 2- D 0.50 M H2PO4-/0.50M HPO4 2- E They all hae the same buffer capacity. There is a group of us working

    asked by DebC
  36. chem 2

    which one of the following pairs of 0.100 mol L-1 solutions, when mixed will produce a buffer solution? a 50. mL of aquesous CH3COOH and 25.mL of aquesous HCI b 50. mL of quesous CH3COOH and 100. mL of aqueous NaOH c 50. mL of aquesous NaOH and 25. mL of

    asked by leaha
  37. Daily Roman LifePlease Help.

    1. Who could be a citizen of Rome? A) men B) women C) slaves D) resident aliens 2. Villas were estates outside of the city with lots of land around them. True or False 3. Slaves in ancient Rome could be, all of the following except______ A) owned by poor

    asked by running.from.myself
  38. math

    a football player can run 20 yards in 3.4 seconds. write an equation to find y, the number of yards the football player can run in a second? i can't seem to figure this one out??

    asked by sue
  39. Chemistry

    In our lab we had to experiment with an apparatus in order to find such things as the percent of KClO_3 in the solution.. Assume that you heated your sample too rapidly and some of the sample spattered onto the rubber stopper of the test tube. Will your

    asked by Liz
  40. Just Curious

    Hey. I was just wondering if anybody on here has been to teenink. I can't post the website but if you Google teen ink, it takes you to it. It is a very interesting site for teenage writers. I just wanted to let people who might be writers know about it.

    asked by running.from.myself
  41. physics

    If one proton and one neutron are added to the nucleus of a nitrogen atom, which atom will the new nucleus look like

    asked by Anonymous
  42. chemistry

    How much heat is evolved or absorbed in this problem? Question Details Limestone, CaCo3, when subjected to a temperature of 900 degrees Celsius in a kiln, decomposes to calcium oxide and carbon dioxide. How much heat is evolved or absorbed when one gram of

    asked by Anonymous
  43. Calculus

    An object moves in a straight line. Its velocity, in m/s, at time t is v(t)=4t^2/(1+t^2),t≥0. Determine the maximum and minimum velocities on the interval 1≤x≤4.

    asked by Jake
  44. physics

    How does the volume of a cube change if the length of one side is increased by one unit, another side is decreased by one unit, and the third side is left unchanged? How does changing the shape of a container affect the volume of the matter?

    asked by Anonymous
  45. Calculus

    Q. An open-top box with a square base is to have a volume of 62.5 square inches. What dimensions will yield the box of minimum surface area? I am getting 5" by 2.5" but not sure.

    asked by Casey
  46. math

    Jose was playing a game with marbles.In the first round ,he lost 1/4 of his marbles.In the Second round,he lost 1/3 of his remaining marbles.In the third round,he lost 1/2 of his remaining marbles.He gave 1 marbles to his friend shavana.He had 1 marble

    asked by Adi
  47. Grammar- Capitaliation

    Assistant dean Shirin Ahmadi recommended offering more language courses. We went to the mark taper forum to see a production of angels in america. Lydia's aunt and uncle make modular houses as beautiful as modernist works of art We amused ourselves on the

    asked by Will
  48. 6th Grade History

    Explain the meaning behind the term Pax Romana. Thanks in advance

    asked by running.from.myself
  49. trig

    y=25sin(120t-4x) what is the wave length what is the speed

    asked by Sylvia Oni
  50. Calculus

    A sporting goods store sells 100 pool tables per year. It costs $20 to store one pool table for a year, based on the average inventory on hand. It costs $40 for each delivery of pool tables. How many times per year and in what lot size should the store

    asked by Casey
  51. Math

    The concentration C(t), in milligrams per cubic centimetre, of a certain medicine in a patient's bloodstream is given by C(t)= (0.1t)/(t+3)^2 where t is number of hours after the medicine is taken. Determine the maximum and minimum concentrations between

    asked by Jake
  52. Science

    If I mixed sugar and sand into the water,what would happen? The sugar would ___, and the sand would ___ dissolve;not dissolve Name 3 examples of a mixture sand and water powder and water marbles and paperclips When I mix salt and water together and the let

    asked by running.from.myself
  53. Algebra 2

    On some tubes of caulking, the diameter of the circular nozzle opening can be adjusted to produce lines of varying thickness. The table shows the length (L) of caulking obtained from a tube when the nozzle opening has diameter (d) and cross-sectional area

    asked by Jenna
  54. Physics

    Blood flows in an aorta of radius 4.62mm at 27.5cm/s. Calculate the volume flow rate. Relevant equation Q (volume flow) = [pi*R^4*(P2-P1)]/(8nL) n=fluid viscosity l=length Tried converting them to.

    asked by aqaurius
  55. health informatics

    how is emerging technology influencing healthcare? and give an example. all what i know is that they are basiclly new technologies and my example is about tissue engineering but the problem is that i don't know how it influences the healthcare!!! so please

    asked by lenny
  56. 9th grade physics

    If a transparent material has a refractive of 2.0; a) calculate the critical angle b) if the refractive index were less than 2,0, would the critical angle be greater or less than before? Im super confused at this :(

    asked by Cathy
  57. chemistry

    Complete the following word equation and write the balanced formula equations: a. Zinc(s) + iodine(g) b. Hydrogen peroxide(l) c. Magnesium(s) + lead(IV) nitrate(aq)

    asked by Anonymous
  58. Trig

    (cos^2t+4cos^2+4)/(cost+2)=(2sect+1)/sect

    asked by Katie
  59. writing

    I need help writing a thesis statement for my philosophy paper. The paper is about two philosopher's, Thrasymachus and Socrates. Essentially the paper is about the multiple definitions of justice that Thrasymachus throws out and how Socrates proves them

    asked by Kathryn
  60. Math

    Find the absolute extrema of the function on the closed interval. f (x) = x^3 − 12x, [0, 4] minimum (x, y) =( ) maximum (x, y) = ( ) I can't even give a setup cause I am lost please help!

    asked by Malika
  61. chemistry

    How many molecules of NH3 are produced from 4.56x10^-4 g of H2

    asked by inwunmi
  62. physics

    Thanks for the answer. I ask If one proton and one neutron are added to the nucleus of a nitrogen atom, which atom will the new nucleus look like? And you gave me the answer: The new atom would be oxygen, isotope 16. Could you please explain to me how.

    asked by Anonymous
  63. social studies

    i am talking about slaves and i don't understand what this sheet is talking about it is made like a moutain 1..is talking about exposition 2.Is talking about rising action 3. Is talking about climax its at the top of the moutain then 4.is talking about

    asked by andalyn
  64. Trig

    Prove (cos^2t+4cos^2+4)/(cost+2)=2sect+1)/sect

    asked by Katie
  65. 6th Grade History

    Who do you think was a more important leader, Julius Caesar or Augustus? Explain.

    asked by running.from.myself
  66. CHEMISTRY

    write the conjugate acid for the following: A.) NO3- = B.) HPO4^2- = C.) Br- = D.) S2- =

    asked by dylan
  67. math

    Robert has two watches, one which loses 6 seconds every 24 hours and one which gains 1 second per hour. He sets both of them to the correct time at 6 : 00 p.m. How many hours will pass before the positive difference between the time shown on both watches

    asked by Miep
  68. Physics

    A lukewarm bottle containing 800 grams of water is placed in a refrigerator. How many calories of heat must be removed from the water to chill its temperature from 55 C to 4 C?

    asked by GRISSELL
  69. Chemistry

    For the reaction system, 2 H2O(g) + O2(g) == 2 H2O2 (g), the equilibrium concentrations are (H2O2) = 0.120 M; (H2O) = 0.860 M; (O2) = 0.330 M. Calculate the value of Kc for this reaction. A. 0.423 B. 0.872 C. 0.0590 D. 1.31 E. 2.51 I did 0.120 / 0.860 X

    asked by Hannah
  70. physics

    If the Earth had two identical moons in one circular orbit, and the moons were as far apart in that orbit as they could be, the center of gravity of the Earth-moons system would beA) at the center of the Earth.B) outside the Earth, but beyond the orbital

    asked by Mrs G
  71. algebra

    Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, by measuring the

    asked by alyssa
  72. Maths- Trigonometry

    4. A,B and C are points on a horizontal plane. A is 75 m from C on a bearing of 210 degrees and the bearing of B from C is 120 degrees. The bearing of B from A is 075 degrees. From A the angle of elevation of the top T of a vertical towel at C is 42

    asked by Jack
  73. Biology

    Arrange the following in correct order in food chain- Fish,Plankton,Shark,Crab

    asked by Zoopy
  74. physics - please help

    Assume the earth is a uniform sphere and that its path around the sun is curcular. Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the US in one year is about 9.33 x 10^9

    asked by Nilan
  75. physics

    Wheel A of radius ra = 14.6 cm is coupled by belt B to wheel C of radius rc = 30.2 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 5.0 rad/s2. At what time will wheel C reach a rotational speed of 52.9 rev/min,

    asked by Katie
  76. statistics

    Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the alloted time?

    asked by Jason
  77. PHYSICS

    Identify the following gas compression descriptions as adiabatic, isothermal or isobaric. a. As the gas compresses, the internal energy ÄU, decreases when the temperature decreases; the work done on the gas is greater than the heat removed from the gas:

    asked by GRISSELL
  78. physics

    1. Which will roll faster down an inclined plane, a can of water or a can of ice?A) A can of water.B) Both the same.C) A can of ice.

    asked by Mrs G
  79. calculus

    use the trapezoidal and simpson's rule to approximate the value of the definite integral ∫2,1 ln xdx; n=4 compare your result with the exact value of the integral

    asked by wei_g
  80. physics

    A 2.49-m-long string, fixed at both ends, has a mass of 7.17 g. If you want to set up a standing wave in this string having a frequency of 455 Hz and 5 antinodes, what tension should you put the string under?

    asked by janny
  81. physics

    A 500-kg cannon and a supply of 80 cannon balls, each with a mass of 45.0 kg, are inside a sealed railroad car with a mass of 11000 kg and a length of 49 m. The cannon fires to the right; the car recoils to the left. The cannon balls remain in the car

    asked by Katie
  82. CHEMISTRY

    which of the following represent a buffer system? A.) NaOH and NaBr B.) HF and NaF C.) HC2H3O2 and C12H22O11 D.) HCl and KOH

    asked by dylan
  83. Chemistry(Please check)

    For the reaction, 2 SO2(g) + O2(g) == 2 SO3(g), at 450.0 K (Kelvin) the equilibrium constant, Kc, has a value of 4.62. A system was charged to give these initial concentrations, (SO3) = 0.254 M and (O2) = 0.00855 M, and (SO2) = 0.500 M. In which direction

    asked by Hannah
  84. math

    Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, by measuring the

    asked by alyssa
  85. Physics

    A lukewarm bottle containing 800 grams of water is placed in a refrigerator. How many calories of heat must be removed from the water to chill its temperature from 55 C to 4 C?

    asked by Tracy
  86. Algebra Project

    x+ 8 – x+2 + x-2 divided by x^2-9 x+3 x-3 Show work:

    asked by Diana M
  87. physics

    Using conservation of energy, find the speed v_b of the block at the bottom of the ramp. Express your answer in terms of some or all the variables m, v, and h and any appropriate constants. I would think it would be square root of v^2+2gh but its telling

    asked by Mrs G
  88. Chemistry

    What is the magnitude of the energy change associated with the emission of one mole of photons of light* with this wavelength? light*= 6.231×1014 Hz

    asked by Zoe
  89. BUSINESS PROBLEM SOLVING & PROGRAMMING

    Using Flowchart and Pseudo Code and a single real example (trace), please solve the following problems: 1. Payroll Computation Compute the monthly salary for each of the 200 employees in a company assuming the formula for computing is as follows Salary =

    asked by nono
  90. calculus

    find the volume of the prolate spheroid (a solid of revolution in the shape of a football ) obtained by revolving the region under the graph of the function y=3/5 √25-x^2 from x= -5 to x=5 about the x-axis...

    asked by volumes of solids of revolution
  91. HCS/457

    Reviews two to three news articles Determines a local community health care issue. Paper answers following questions: How long has it been a problem? How has it affected the community? How has the community responded?   Organization/Development The

    asked by Jennifer
  92. chemistry

    2. Aluminum chloride was a product in step 6. How could you instruct your lab partner to recover it.

    asked by Anonymous
  93. chemistry

    How do I construct an energy level diagram for the hydrogen atom. I have all the energies, but I do not know how to make the diagram.

    asked by Jimmy
  94. elementary statistics

    56% of families had no children under the age of 18;17% had no child;18% had two children;6% had three children; and 3% had four or more children. If a family is selected at random, find the probabilty that the family has less than three children(express

    asked by goldielocks
  95. chemistry

    write the conjugate base for the following: A.) HCN= B.) HPO4^2- = C.) NH4+ = D.) HC2H3O2=

    asked by dylan
  96. chemistry 2

    which of the following has the highest bugger capacity? A 0.10M H2PO4-/0.10M HPO4 -2 B 0.50 M H2PO4-/0.10 M HPO 2- C 0.10 M H2PO4-/0.50 M HPO4 2- D 0.50 M H2PO4-/0.50M HPO4 2- E They all hae the same buffer capacity.

    asked by ameryss
  97. physics

    To tighten a bolt, you push with a force of 72 N at the end of a wrench handle that is 0.26 m from the axis of the bolt.What torque are you exerting? I GOT THIS PART AS 19N *m unsure of the next two: If you move your hand inward to be only 0.10 m from the

    asked by Christie
  98. Calculus

    An object moves in a straight line. Its velocity, in m/s, at time t is v(t)=4t^2/(1+t^2),t≥0. Determine the maximum and minimum velocities on the interval 1≤x≤4. The answer says min. velocity is 0m/s but has no maximum?

    asked by Jake
  99. Chemistry

    The reaction, 2 SO3(g) == 2 SO2(g) + O2(g) is endothermic. Predict what will happen if the temperature is increased. A. the pressure decreases B. more SO3(g) is produced C. Kc increases D. Kc decreases E. none of the above I chose that Kc will increase.

    asked by Hannah
  100. Physics

    An unknown substance is found to require a very large amount of heat energy to raise its temperature a single degree. Does it have a high specific heat capacity or a samall specific capacity? Explain

    asked by GRISSELL
  101. Physics

    At the lowest point in its swing, a 2.5 kilogram pendulum bob has 40 Joules of kinetic energy. How high will its swing when it reaches the highest point in its swing?

    asked by Tracy
  102. Math

    Darby guesses the answers to six questions on the math portion of her college entrance exam. Each question is a true or false question. What is the approximate probability that at least 4 of her answers are correct? A. 0.23 B. 0.34 C. 0.66 D. 0.78 Is it B?

    asked by Student
  103. physics

    Can friction (which causes heating) with the atmosphere ignite the object moving through the atmosphere? Can someone help me with this? Please!

    asked by I
  104. economics

    The MidNight Hour, a local nightclub, earned $100,000 in accounting profit last year. This year the owner, who had invested $1 million in the club, decided to close the club. What can you say about economic profit (and the rate of return)in the nightclub

    asked by Wilbert
  105. English

    Hello. I will be grateful for some help. 1)Does the phrase "a sharp fall in soldier numbers" sound natural (meaning "a drop in troop numbers")? 2)Which word (that or which) is used in the context "he didn't give the exact number of troops that/which will

    asked by Ilma
  106. Math

    Police use a formula s = S √1/L , where S is the test-car speed and L is the test-skid length, to find the actual speed s in an accident which left a skid mark of l. Find the actual speed s (nearest whole mph) when S=45 mph, 1=150 ft, L=100 ft.

    asked by Marie
  107. Trig

    prove(sinx/cosx+1)+(cosx-1/sinx)=0 Please help asap!!!!! PLEASE

    asked by Katie
  108. physics

    when you dive from atop a tall flagpole into a swimming pool below. His potential energy at the top is 14000 J (relative to the surface of the pool).What is his kinetic energy when his potential energy reduces to 1000 J?

    asked by Mrs G
  109. calculus

    find the volume of the solid of revolution obtained by revolving the region bounded above by the curve y=f(x) = √16-x^2 and below by the curve y=g(x) from x=0 to x=x√2 about the x-axis

    asked by Anonymous
  110. chemistry

    The concentration of calcium ions in hard water can be determined by titration with reagent X,which forms a complex with Ca2+(aq), giving a change of color. Three moles of X combine with one mole of Ca2+(aq). Since the color change in this titration is

    asked by Anonymous
  111. social studies

    Do we have an imbalance of trade, where some nations dominate? If so who dominates world trade today? (2 examples) How does this imbalance impact our world today? (2 examples)

    asked by Morgan
  112. math

    8 9/10 minus 3 4/10 =

    asked by Sam
  113. Math

    In a right triangle, find the length of the side not given. Approx to the three decimal places. a and b are the length of the legs and c is the length of the hypotenuse. b = 4"sqrt"2 and c = 9

    asked by Marie
  114. maths

    f(x)=px^3 + 6x^2 + 12x + q given that the remainder when f(x) is divided by (x - 1) is equal to the remainder when f(x) is divided by (2x + 1), (a) find the value of p. given also that q = 3, and p has the value found in part (a) (b) find the value of the

    asked by peter
  115. Chemistry(Please check)

    I ahve to find the concentration of product, (Fe(SCN)^2+) at equilibrium. We have to use the equation k=A/C I have the value for k and A so my equation is 7917.6 = 0.453/C = 3586.67M Did I do the math correctly?

    asked by Hannah
  116. Physics help?

    A 170 -pF capacitor is connected in series with an unknown capacitance, and as a series combination they are connected to a battery with an emf of 25.0 V. If the 170 -pF capacitor stores 135 pC of charge on its plates, what is the unknown capacitance?

    asked by BOB
  117. Chemistry

    I wanted to calculate the normality of the acid and base solutions for a lab. But I'm extremely confused. I know normality is number of equivalents divided by volume in liters. But are we suppose to be given the number of equivalents of HCl and NaOH? Or

    asked by Priscilla
  118. chemistry

    as i need to perform a project on " chemical reactions on metals " could you please suggest me some useful material along with an experiment to perform

    asked by R S Telagathoty
  119. math

    Which units would you use to measure the area of a rectangle with / = 1 m and w = 34 cm? Explain.

    asked by shion
  120. Stats

    Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is 75% 95% 68% 99.7%

    asked by Ashley
  121. social studies

    what did the delegates to the annapoliscovention decide the country needed

    asked by hether
  122. geometry

    You are buying a ladder for your 30-foot-tall house. for safety, you would like to ensure that the base of the ladder be placed at least 8 foot from the base of the house. What is the shorest ladder you can buy in order to be able to reach to top of your

    asked by kim
  123. com156

    Paraphrasing and Quoting Review the following passage and paraphrase the long passage in the following box. Use the reference to create an appropriate APA-formatted, in-text citation. Additionally, include one direct quotation. One of the most valuable

    asked by tasha
  124. physics

    Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same

    asked by rachel
  125. PHYSICS

    A cylinder contains 0.1 cubic meters of gas at atmospheric pressure. This gas is allowed to expand until its pressure drops to 7800 Pa. What is the gas volume after this expansion has taken place?

    asked by GRISSELL
  126. PHYSICS

    You are using a hydraulic jack to lift a 12000 Newton object. This input piston of your jack has a radius of 0.85 meters and you can exert a maximum of 3500 Newtons on it. How large does the radius of the output piston need to be in order to lift this

    asked by GRISSELL
  127. chemistry

    3.796 liters of ethane (C2H6) are burned. What volume of oxygen is necessary and what volume of each product is produced?

    asked by Anonymous
  128. US History Since 1876

    Did the United States win the war for the Allied Powers? Discuss the American contribution to the war effort and evaluate its significance.

    asked by Jason
  129. math

    help please!!! how do i write this as an algebraic expression: ten dollars more than grace has

    asked by sue
  130. statistics

    The following project uses the game of Guess Your Card. This is a game in which each player draws (without looking) three cards. Each card has a number between 1 and 9 on it. The players then place their cards on their heads so that everyone but themselves

    asked by d's
  131. Physics circuit help please!

    Hi all. I posted earlier but I'm still stuck on part of this problem. I thought that statements 2 and 3 were correct below. But I got the problem wrong. Any help would be great! Can the voltage across any of the three components in the R-L-C series circuit

    asked by Jim
  132. Trig

    prove(sinx/cosx+1)+(cosx-1/sinx)=0

    asked by Katie
  133. physics

    Light passes from medium 1 to medium 2 where n1>n2. a)Sketch the incident reflected and refracted rays.

    asked by Scibe
  134. pseudocode

    Assume that your family has 10 members. Assume further that each family member has a certain amount of savings. Your task is to determine: (a) the total amount of savings that the family has, as a whole and (b) to determine who has the largest savings. To

    asked by Anonymous
  135. Math

    A right circular pole has a base radiur r and a vertical angle 2ydegrees.Find the height of the pole in terms of r and y

    asked by Anonymous
  136. chemistry

    1. Heat can initiate reaction as well as be a product of chemical reactions. Cite the specific sample from the experiment that show heat acting in the manner.

    asked by Anonymous
  137. Physics help please!

    Hi all. I posted earlier but I'm still stuck on part of this problem. I thought that statements 2 and 3 were correct below. But I got the problem wrong. Any help would be great! Can the voltage across any of the three components in the R-L-C series circuit

    asked by Jim
  138. chemistry

    How many liters of oxygen are necessary to burn 30.4 liters of ethyl alcohol (C2H5OH)? (Assume complete combustion)

    asked by Anonymous
  139. precalcus will someone check my homework

    f(3)=-3/8 and (f-2)=-12 MY SOLUTION F(-2)=ab^-2 = -12 F( 3)=ab^ 3 = -3/8 b^5 = 12 * 3/8 = 32 b=2 12 = a(2)^2 12 = 4a a =3 f(x)=3(2)^x

    asked by luckybee
  140. Grammar

    How to fix this sentence ? Florence embraced the duties of First Lady

    asked by Zack
  141. physics

    Which would be bigger, a 20 kg block of aluminum or a 10 kg block of copper? Why?

    asked by Anonymous
  142. Calculus

    Can someone explain this question to me? What intervals should I use to test whether or not the graph is concave up or down. I know that no points or equations are given so we have to estimate. Here is the URL for the graph. imgur dotcom/FdQCV

    asked by Jake
  143. Math

    Find the value of constant n if the lines y=(n-2)x+12 and 3x-4y+5=0 are: a) parallel and b) perpendicular to each other. Thanks in advance.

    asked by William
  144. Circuits

    A 170 -pF capacitor is connected in series with an unknown capacitance, and as a series combination they are connected to a battery with an emf of 25.0 V. If the 170 -pF capacitor stores 135 pC of charge on its plates, what is the unknown capacitance?

    asked by Susan
  145. chem 2

    if 10.0g of NaF and 20.0 g of HF are dissolved in water to make one liter of solution, what will the pH be? For HF, Ka=6.8x10-4.

    asked by rick
  146. chemistry

    how do you do electron dot diagrams?

    asked by ali
  147. physics

    To tighten a bolt, you push with a force of 72 N at the end of a wrench handle that is 0.26 m from the axis of the bolt.What torque are you exerting?

    asked by Christie
  148. HSPA Prep

    Marybeth is trying to remember her 4-letter password. All she remembers is that no two letters in her password are the same. How many different permutations are there if the combination of letters does not have to be an actual word?

    asked by Anonymous
  149. statistics

    You and three (3) of your friends were in the same advance placement high school chemistry class in high school. All four (4) of you decided to take the same chemistry class together at the local university along with 21 other students. On the first day of

    asked by d's
  150. math

    Matt has a magic number basket. The only numbers that can be placed in the basket are numbers that have two, three, or four digits, all the digits must be odd, and the digits must increase from left to right. How many numbers can Matt place in the basket?

    asked by Miep
  151. Physics

    A person heats up a can of soup on a stove. If he does 250 Joules of work on the soup by stirring it as the burner adds 1675 Joules of heat, what is the change in its internal energy?

    asked by GRISSELL
  152. Physics

    What is the magnitude of buoyant force acting on a 720 cm^3 toy submarine floating in fresh water? (D_water =1 g/cm^3)

    asked by Tracy
  153. geometry

    Hot air balloons require large amounts of both hot air and fabric material. A hot air balloon is spherical with a diameter of 25 feet . a. Does finding the surface area help you determine the amount of the hot air or the fabric material? Explain

    asked by kim
  154. Physics

    A person heats up a can of soup on a stove. If he does 250 Joules of work on the soup by stirring it as the burner adds 1675 Joules of heat, what is the change in its internal energy

    asked by Tracy
  155. physics

    A solar heating panel on a roof is used to heat 40 kg of water initially at 22 degress celsius, using the sun, which absorbs 750 joules per second. What would the temperature of this water be after 1 hour?

    asked by Ryan
  156. Chemistry

    What volume of hydrogen chloride gas will result when hydrogen gas is combined with 58.35 liters of chlorine gas? I need help balancing the equation also.

    asked by doll
  157. geometry

    you want to buy a pickup truck and are interested in one with a large carrying capacity. One model features a rectangular prism-shaped cargo space, measuring 6ft by 10ft;another has a space with dimensions 5ft by 11ft by 3ft. Which truck provides you with

    asked by kim
  158. math

    I am really confused about sets. Could you explain to me if the following are opened or closed sets and why? (a) the set of even numbers for division. (b) the set of whole numbers less than 1000 for division. (c) the set of whole numbers greater than or

    asked by sunshine
  159. ALG WORD PROBLEM

    Loan Mixture: A student takes out a total of $5000 in three loans: one subsidized, one unsubsidized, and one from the parents of the student. The subsidized loan is $200 more than the combined total of the unsubsidized and parent loans. The unsubsidized

    asked by HELP NEEDED
  160. Jiskha

    U guys answr evry question??????

    asked by MIKE
  161. math

    ok so now i have to write an equation for the following: two more than the number of frogs is 4. i think it is f+2=4 am i right?

    asked by sue
  162. Math

    If I am give the the sides of a triangle, where Side RA=4 Side AB=4.8 Side RB=7.1 How do I find Angle RAB? Thanks!

    asked by Tommy
  163. Chemistry

    If it takes 6.6E-7 seconds for one wavelength of a wave to pass a stationary point, what is the frequency of the wave in Hz? I cannot figure out what equation to use or how to use it.

    asked by Shea
  164. calculus

    Implicit Differentiation question x^y = y^x I was wondering if I was right in the steps I was taking first was to take the Ln or both sides making it y Ln(x) = x Ln(y) then just taking the derivatives of both sides using product rule twice y/x + y'Ln(x) =

    asked by Daniel
  165. physics

    what is acceleration?

    asked by qwerty
  166. postings

    sorry but we are a group working together.

    asked by leaha
  167. Economics

    how to calculate Qd=15.0-0.2P

    asked by Dee
  168. Quantitative methods

    Hostis sent a car company charges 45 dollars per day plus 40 cents per mile for a compact car, and gasoline costs 1.19 dollars per gallon. If the car gets 25 miles per gallon of gasoline, how many miles can the driver travel each day on a budget of 100

    asked by Anonymous
  169. calculus

    find the area of the region under the curve y=f(x)=e^2x over the indicated interval x

    asked by wei_g
  170. English

    Writeacher, could you please check if the corrections are OK? Thank you. 1)The hero usually has a period of doubt, in which he carries out his plan of vengeance. 2)The hero becomes more and more isolated and barely (I think "barely" doesn't mean anything

    asked by Henry
  171. English

    I left out the following sentences, thank yoU, Writeacher. 1) She tells him to wash his bloody hands with water. 2) The main characteristics of a revenge tragedy are as follows. First, a violent or sexual crime is committed against a member of the hero's

    asked by Henry
  172. English

    Hello. I will be very grateful for your help. 1)Which article is correct in the context: "The ambassador gave a/the(?)promise that his country would not interfere"? 2)Do you think it's possible to use "carry out" or "realise" with "visit", for example,

    asked by Ilma
  173. English

    Hello. I will really appreciate some help. 1)Is it possible to use "after" in the pattern "Present Perfect after Past Simple" or is it to be "since", for example: "Relations between the countries have worsened after (since)a terrorist attack killed 20

    asked by Ilma
  174. Science

    Name 3 examples of a solution salt and water citric fruit and water Can you help me come up with a 3rd one?

    asked by running.from.myself
  175. darling.of.his

    Explain how to find the new coordinates of a point that is translated 3 units right and 2 units down. I would appreciate any help on this question. Thank you.

    asked by running.from.myself
  176. 6th Grade Geography

    Who ruled after Augustus?

    asked by running.from.myself
  177. Math

    ln k2/2.34 = -103,000J/8.314J/Kol[1/339K - 1/359K] ln k2/2.34 = -2.035941063 I am not sure what to do now!!

    asked by Hannah
  178. algebra

    Solve for x (x+1)(x-3)>12

    asked by claudz
  179. Math

    Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same

    asked by rachel
  180. algebra

    800 is 22% of what number

    asked by Jay
  181. Ecology

    I Have an assignment that requires me to design, write and carry out an analysis and a report of survey from beginning to end however, the confusing part it that it has to be done without any actual data i don't know how to start that. Please help topic is

    asked by Muhammad
  182. Science

    If I mixed sugar and sand into the water,what would happen? The sugar would ___, and the sand would ___ dissolve;not dissolve

    asked by running.from.myself
  183. physics

    If two lamps with 15 cd and 35 cd are separated by 8.5, at what point would the light produced by both lamps be equal?

    asked by Anonymous
  184. math

    a school has purchased a large field that has a square area of 19,500 ft squared. what is the approximate length of each side of the square area?

    asked by sam
  185. geometry

    Tree stands 25 feet tall and 15 feet wide base 7.5 feet . You want to hang strings of lights from top to bottom on the outside. How long should each string be?

    asked by kim
  186. understanding hospital billing and cosing

    The first step in coding is to read the record for the purpose of ____________________________.

    asked by Jada
  187. math

    a square has sides of 9 inches. A second square is going to be drawn with a scale factor of 3. What is the area of the second square?

    asked by vanessa
  188. Intergrated Arts

    Looking at examples from Whitney collection, what qualities do the art works have in common?

    asked by Sheila
  189. Physics

    A 3 m long wire carrying a current of 1 A through a magnetic field of magnitude 17 T experiences a force of 8 kN entirely due to the current passing through the magnetic field. what angle does the wire make with the magnetic field?

    asked by Fatih