1. chemistry

    Thermochemistry: 1. Calculate the amount of heat required to decompose 3.5 moles of sodium bicarbonate. 2NaHCO3 + 129 kJ  Na2CO3 + H2O + CO2 In this question, the heat of the reaction is part of the question instead of being written beside it- (What's

    asked by Bethany on March 17, 2015
  2. Chemistry

    What is the molar mass of Ag2CrO4 I think you should search in askforkids website. I went there and I got help with my English Homework. My name is Tanisha and your name is Tasheena. Similar Right? Look them up in the periodic table and add their masses.

    asked by Tasheena on December 26, 2006
  3. Programming Logic & Design

    Modify the previous process to store the scores in an array. You will need to use either parallel arrays or a two-dimensional array in order to store the score, slope and rating for each entry. In the loop you created in the previous assignment to read the

    asked by Julie on April 10, 2014
  4. algebra

    Determine the value(s) of k for which x^2+(k-2)x-2k=0 has equal and real roots. a x^2 + bx + c = 0 has two different roots if the discriminant D defined as: D = b^2 - 4 a c does not equal zero. If D = 0 then there is one root. That root is then real if b/a

    asked by Shay on January 18, 2007
  5. chem 11

    You have 2 chemicals A (solid) and B (solid), but you do not know the exact composition of either one of them. You do know that all together, there is SOME combination of sodium, barium, chloride and phosphate (PO4^3-) present. You dissolve both chemicals

    asked by Anonymous on July 18, 2010
  6. physics

    A 1-kg mass (the blue mass) is connected to a 9-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

    asked by please on March 24, 2012
  7. physics

    A 1-kg mass (the blue mass) is connected to a 9-kg mass (the green mass) by a massless rod 70 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

    asked by deb on March 24, 2012
  8. physics

    A 1-kg mass (the blue mass) is connected to a 9-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

    asked by hania on March 25, 2012
  9. physics

    A 1-kg mass (the blue mass) is connected to a 8-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

    asked by hania on March 25, 2012
  10. physics

    A 1-kg mass (the blue mass) is connected to a 9-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

    asked by Anonymous on March 26, 2012
  11. chemistry

    A cylinder is filled with 10.0L of gas and a piston is put into it. The initial pressure of the gas is measured to be 200.kPa. The piston is now pushed down, compressing the gas, until the gas has a final volume of 3.10L. Calculate the final pressure of

    asked by lady gaga on October 16, 2018
  12. chemistry

    A cylinder is filled with 10.0L of gas and a piston is put into it. The initial pressure of the gas is measured to be 200.kPa. The piston is now pushed down, compressing the gas, until the gas has a final volume of 3.10L. Calculate the final pressure of

    asked by Alexander on October 16, 2018
  13. chemistry

    A calorimeter contained 75g of water at 16.95 degree Celsius. A 93.3g Iron at 65.58 degrees celsius was placed in it, giving a final temperature of 19.68 degrees Celsius for the system. Calculate the heat capacity of the calorimeter. specific heats are

    asked by help on September 15, 2018
  14. Physics/mats

    Two blocks with masses m1 = 1.40 kg and m2 = 3.00 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.390.In the figure m1 is on top of

    asked by HP on March 7, 2013
  15. Physics

    Two blocks with masses m1 = 1.40 kg and m2 = 3.00 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.390.In the figure m1 is on top of

    asked by Heidi on March 6, 2013
  16. Econ stats

    Sidney Crosby’s score statistics for the regular 2007 championship season were used to construct the following table: Experimental Outcome (x), Number of Occurrences during the 2007 Season (0, 358) (1, 175) (2 28) (3 3) (4 10) a. Use the relative

    asked by Maya on November 2, 2017
  17. physics

    img145.imageshack.us/img145/7130/picture1n.png this is basically the diagram to my question A person of mass m = 62 kg is doing push-ups as shown in the attached figure. The distances are a = 91 cm and b = 60% of l1. Calculate the vertical component of the

    asked by anna on November 4, 2010
  18. Mathematics

    a cuboid with length 13cm width 4cm and height h State in terms of h the shaded face of the cuboid. write an expression in terms of h for the volume of the cuboid. if the volume of the cuboid is 286cm cube calculate the height h of the cuboid.

    asked by SAM on May 2, 2012
  19. AP CHEMISTRY

    Consider the reaction. PbCO3(s) PbO(s) + CO2(g). calculate the equilibrium pressure of CO2 in the system at the following temperatures.(IN atm) (a) 270°C (b) 480°C ..... delta Hf(KJ/mol).. d.Gf(KJ/mol).. S(J/mol-K) PbCO3(s)..-699.1 .. -625.5 .. 131.0

    asked by DAN on March 20, 2012
  20. Materials Science and Engineering

    In the figure below, Intrinsic carrier concentration is given as a function of temperature for Ge and Si. By using the data in this figure calculate the band gap of these materials. For both materials find the energy difference between the Fermi Energy

    asked by hewhomustbenamed82 on April 1, 2018
  21. Physics

    A curling stone with a mass of 18 kg slides 38m across a sheet of ice in 8.0 s before it stops because of friction. What is the co¨efficient of kinetic friction between the ice and the stone? (Note: you will need to calculate the acceleration of the stone

    asked by Sarah on October 29, 2015
  22. Chemistry

    A sample of methane (CH4) gas contains a small amount of helium. Calculate the volume percentage of helium if the density of the sample is 0.70902 g/L t 273K and 1.00 atm. I know that the sample is at STP and that the 1 mole of gas under these conditions

    asked by Chris on October 29, 2014
  23. chemistry lab

    Could someone help me with this? i am tired of it. here is my data from lab: Buffer1: HPO4- weight 3.412g; original pH Buffer 2: HEPES wt: 1.090g original pH 10.08 buffer1: pH of 0.1M: 7.5; pH of 0.01: 7.72; pH of 0.001M: 7.87 buffer2: PH of 0.1M: 7.5 ph

    asked by amanda on February 1, 2008
  24. Chemistry

    here is the question. it is a fact that when you add acetone to saturated sodium chloride, the equilibrum shifts towards the right. what observation supports this fact? what is the role of acetone in shifting the equilibrium towards the right side? What

    asked by Dalala on March 21, 2010
  25. Physics

    A 645-kg elevator starts from rest and reaches a cruising speed of 1.47 m/s after 3.13 seconds. It moved 2.75 m during that time. What average power (W) is delivered by the motor during the initial acceleration of the elevator during the first 3.13

    asked by Casey on June 6, 2011
  26. Chemisty

    A certain salt is known to have a solubility in water of 25.2g/100g water at 100°C and 11.4g/100g water at 20°C. The salt is dissolved in 240 g of water at 100°C until no more solid will dissolve. How much salt will crystallize out when the solution is

    asked by love on January 19, 2012
  27. chemistry

    You have a solution which contains an unknown concentration of an organic compound quinone O=CC4H4C=O and an unknown concentration of Pb2+ and Al3+. Explain how to determine the unknown concentrations of quinone, Pb2+ and Al3+.

    asked by ct on June 6, 2015
  28. algebra

    Solve the following system of equations. You will type your x value in the first part and the y value in the second part of the question. If the answer if no solution then type NS in both parts and if the the answer is infinite solutions then type I in

    asked by samay on January 22, 2018
  29. Algebra II

    How many real solutions does the function shown on the graph have? a) no real solutions b) one real solution c) two real solutions d) cannot be determined ___________________________ y = (x+2)^2 + 3 is shown on the graph. I am having trouble figuring this

    asked by Anonymous on January 12, 2018
  30. Math

    Solve the following system of equations. You will type your x value in the first part and the y value in the second part of the question. If the answer if no solution then type NS in both parts and if the the answer is infinite solutions then type I in

    asked by Bill on January 24, 2018
  31. math

    Solve the following system of equations. You will type your x value in the first part and the y value in the second part of the question. If the answer if no solution then type NS in both parts and if the the answer is infinite solutions then type I in

    asked by Anonymous on January 23, 2018
  32. Maths

    a) Express f(theta) = 4cos theta - 6sin theta in the form r cos(theta + alpha) b) Hence find the general solution of the equation 4cos theta - 6sin theta =5 c) Hence, find the minimum value of the function 1/4+f( theta)

    asked by Becky on April 23, 2019
  33. Trig

    A group of friends are going on a vacation together. They plan to rent a large house for $3000 and share the cost. They also estimate that the buying food for the week will cost $150 per person. Write a reciprocal function to calculate the cost per person

    asked by John on December 7, 2017
  34. Physics

    At the bow of a ship on a stormy sea, a crewman conducts an experiment by standing on a bathroom scale. In calm waters, the scale reads 172 lb. During the storm, the crewman finds a maximum reading of 215 lb and a minimum reading of 131 lb. Calculate the

    asked by Lilly on February 21, 2012
  35. Honors Physics

    A mechanic jacks up the front of a car to an angle of 8.8° with the horizontal in order to change the front tires. The car is 2.92 m long and has a mass of 1330 kg. Gravitational force acts at the center of mass, which is located 1.02 m from the front

    asked by Donkey on November 17, 2015
  36. physics

    A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 18.0° with the horizontal. A 22.0 kg piece of luggage is

    asked by Anonymous on November 4, 2012
  37. chemistry

    Phosgene (COCl2) is an extremely poisonous gas that was used extensively in World War I as a chemical warfare agent. At 300oC, phosgene decomposes to carbon monoxide and chlorine with a Kp = 6.8 x 10-2. Calculate the pressure in the vessel at equilibrium

    asked by Samuel on October 13, 2008
  38. Physics

    Periodic waves spread out over the surface of a lake where two women, Jenny and Melissa, are fishing in separate boats 102 meters apart. Each woman's boat bobs up and down 19/min. At a time when Jenny's boat is at a crest, Melissa's boat is at its lowest

    asked by Anonymous on March 7, 2013
  39. ChemistryStociometry

    6.0g of cobolt (II) carbonate was added to 40cm3 of hydrochloric acid, concentration 2.0 mol/dm3. Calculate the maximum yield of cobalt (II) choloride-6-water and show that cobalt (II) carbonate was in excess. CoCO3 +2HCl = CoCl2 +CO2 + H2O CoCl2 + 6H2O =

    asked by RM on January 1, 2017
  40. Chemistry

    Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (D) calculate E at the

    asked by Sam on January 24, 2015
  41. Physics

    A car with a mass of 1264 kg is coasting in neutral on a straight,level road. It slows down, and its speed as a function of time is given by the equation: Constant Value Units a 26.8 m/s b 0.310 m/s2 c 2.10·10-3 m/s2 At a time of 36.0 s the speed, as

    asked by John on January 2, 2014
  42. physics for scientists and engeneers I

    A 0.145-kg baseball pitched horizontally at 27 m/s strikes a bat and is popped straight up to a height of 43 m. If the contact time between the bat and the ball is 2.35 ms, calculate the average force [exerted by the bat on the ball] during contact. [Let

    asked by Johnathon on February 15, 2011
  43. Calculus

    A sinusoidal section is to be built as part of a roller coaster track. The high point is h=27 m at a horizontal distance d=0 m. It has a low point at h=-3 m at d=50 m. a. Write an equation expressing h in terms of d. b. The lengths of the horizontal

    asked by Nick on September 23, 2014
  44. Physics

    Consider a 59-cm-long lawn mower blade rotating about its center at 2990 rpm. (a) Calculate the linear speed of the tip of the blade. (b) If safety regulations require that the blade be stoppable within 3.0 s, what minimum angular acceleration will

    asked by Camilla on June 16, 2012
  45. Physics

    A mechanic jacks up the front of a car to an angle of 6.2° with the horizontal in order to change the front tires. The car is 2.91 m long and has a mass of 1100 kg. Gravitational force acts at the center of mass, which is located 1.02 m from the front

    asked by Mike on March 3, 2011
  46. ap chemisty

    Calculate the heat of formation of butane given that the heat of formation of H20(l) is -285.3 kj/mol and the heat of formation of CO2(g) is -393.5 kj/mol.

    asked by Sarah on September 24, 2010
  47. Physics

    A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and b) the average speed.

    asked by Jade on June 17, 2014
  48. Math

    In a family six members eat meat; five members eat fish while two eat both. Calculate the number of members in the family. How do we solve these ones? Hints please...

    asked by Christopher on May 30, 2014
  49. math

    The bearing of A and B from a port p are 225 degree and 116 degree respectively.ship A is 3.9 km from ship B on a bearing of 258 degree. Calculate the distance of ship A from p

    asked by miracle on November 14, 2017
  50. math help plz!

    Calculate the future value of quarterly payments of $1200 for 5 years, if the rate of interest was 10% compounded quarterly for the first 2 years and will be 9% compounded quarterly for the last 3 years.

    asked by Thara! on April 21, 2010
  51. Chemistry

    Calculate the equilibrium constant 2SO2(g]+O2(g]⇌2SO3(g] given equilibrium constant of SO2,O2,SO3 are 0.3m,0.14,1.45 respectively wt happens to the equilibrium constant a) if so2 is added b)if o2 is removed

    asked by MANASA on November 30, 2016
  52. Maths

    A floor is measuring 8 metres by 6 metres is covered with carpet. If carpet costs $25.00 per square metres, calculate the cost of the carpet for the floor.

    asked by Faith on October 11, 2015
  53. Chemistry

    Bill and Bob have been testing a new aluminised PET (Polyethylene Terephthalate) film and they now use the material to make helium filled balloons. Bill’s balloon is less inflated than Bob’s, and the latter jokes about it. However, Bill insists he has

    asked by MM on February 8, 2012
  54. Chemistry

    Bill and Bob have been testing a new aluminised PET (Polyethylene Terephthalate) film and they now use the material to make helium filled balloons. Bill’s balloon is less inflated than Bob’s, and the latter jokes about it. However, Bill insists he has

    asked by MM on February 8, 2012
  55. Chemistry

    1. When the hydrochloric acid is added to the calcium carbonate, will there be an excess of HCl(aq) or CaCO3(aq) or will there be stoichiometric equivalents of the two? Show your calculations. 2. In this lab, you will use a 50mL buret and ~0.3M NaOH (aq).

    asked by Doug on October 11, 2017
  56. Economics

    How does the expenditure approach calculate GDP? ____________________________________ A. It adds up all the incomes in the economy.***** B. It adds up the value of four groups of final goods and services. C. It adds up the value of business goods and

    asked by ♥Nirvana♥ on February 17, 2016
  57. chemistry

    2. Calculate the enthalpy change of combustion for ethene gas (C2H4) given the following enthalpy changes of formation: ΔHºf(C2H4)(g) = +52 kJ mol^-1 ΔHºf(CO2)(g) = -394 kJ mol^-1 ΔHºf(H2O)(g) = -286 kJ mol^-1

    asked by John on July 19, 2014
  58. Chemistry

    A sample of calcium carbonate that has a mass of 1.0 g is heated and completely decomposed-calculate. a) the mass of carbon dioxide produced b)the volume of carbon dioxide at SLC c)the volume of carbon dioxide at STP

    asked by Ally on May 2, 2013
  59. physics

    An object whose height is 3.5 cm is at a distance of 8.5 cm from a spherical concave mirror. Its image is real and has a height of 11.2 cm. Calculate the radius of curvature of the mirror. How far from the mirror is it necessary to place the above object

    asked by help? on May 24, 2008
  60. physics

    You throw a 134 g ball straight up to a height of 43.0 m. (a) Assume that the displacement of your hand is 0.70 m as you throw the ball straight up. How long is the ball is in your hand? (b) Calculate the average force exerted by your hand while you are

    asked by Nick on March 7, 2012
  61. Physics

    Calculate the distance, in m, of the centre of mass of the Earth-Moon system from the centre of the Earth. Note: the mass of the Moon is 7.35x10 22kg, the mass of the Earth is 5.98x10 24kg, and their separation is 3.85x10 8m.

    asked by Amber on April 22, 2016
  62. Physics

    a stone is projected vertically upward with a velocity of 20,two seconds later a second stone is similarly projected with the same velocity, when the two stones meet,the second one is rising at a velocity of 10, calculate the length of time the second

    asked by Covenant on December 19, 2018
  63. math

    An airplane flies from a town X on a bearing of N45 0E to another town Y, a distance of 200km. It then. Changes course and flies to another town Z on a bearing of S60 0E. If Z is directly east of X, calculate, correct to 3 significant figures. a. the

    asked by alex on March 2, 2019
  64. physics

    An object whose height is 3.5 cm is at a distance of 8.5 cm from a spherical concave mirror. Its image is real and has a height of 11.2 cm. Calculate the radius of curvature of the mirror. How far from the mirror is it necessary to place the above object

    asked by help? on May 25, 2008
  65. maths

    the distance covered by a falling ball varies as the square of the time taken. If a ball falls through 1800m in 15seconds,calculate the distance when the time taken is 15seconds and the time taken for is distance of 648m.solve using variation

    asked by chinaemerem on April 25, 2017
  66. chemistry

    Calculate the delta H for the reaction N2H4(l)+ O2(g) --> N2(g) + 2H20(l) Given the following data: 2NH3(g) + 3N20(g) --> 4N2(g) + 3H20(l) N20(g) + 3H2(g) --> N2H4(l) + H20(l) 2NH3(g) + 1/2O2(g) --> N2H4(l) + H20(l) H2(g) + 1/2O2(g) --> H20(l)

    asked by kilo on October 28, 2009
  67. Chem

    10.0 grams of barium chloride (208.3g/mol) is reacted with excess potassium phosphate and 7.22 of grams of barium phosphate (601.8 g/mol) is isolated. calculate the theoretical yield of barium phosphate

    asked by Anonymous on April 3, 2014
  68. Maths,variation

    the distance covered by a falling ball varies as the square of the time taken. If a ball falls through 1800m in 15seconds,calculate the distance when the time taken is 15seconds and the time taken for is distance of 648m.solve using variation

    asked by Gift on February 11, 2018
  69. Physics

    A physicist converted 2 kg of water at 37 degrees celcius to steam at 100 degrees celcius. Assuming no heat is lost, calculate the amount of energy needed to heat to 100 degrees celcius.

    asked by i need help on June 5, 2015
  70. Math

    I think I have my answer but I still need help Daniellewillusetheinstructionsintheboxbelow to make a cleaning solution. Add 13 cups of water to every 2 cups of concentrated cleaner. Which of the following proportions can be used to find w , the number of

    asked by Ben on March 26, 2018
  71. chemistry

    1. What mass of lead chloride (PbCl2, MW= 278.2; Ksp= 1.8 x 10^-10) is dissolved in 250 mL of a saturated solution? 2. What mass lead chloride (PbCl2, MW=278.2; Ksp=1.8 x 10^-10) will dissolve in 150 mL of 0.050 M Pb(NO3)2?

    asked by lindsey on July 31, 2010
  72. Algebra

    The work and solution to: Stefan is bicycling on a bike trail at an average of 10 miles per hour. Erik starts bicycling on the same trail 30 minutes later at 16 miles per hour. How long will it take Erik to pass Stefan?

    asked by Michelle on May 29, 2013
  73. physics!!

    The two masses (m1 = 4.96 kg and m2 = 2.90 kg) in the Atwood's machine shown in the figure below are released from rest, with m1 at a height of 0.800 m above the floor. When m1 hits the ground its speed is 0.203 m/s. Assuming that the pulley is a uniform

    asked by Emily on October 21, 2012
  74. Chemistry

    To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. A chemical engineer places a mixture of noble gases consisting of 4.50 g of He, 15.0 g of Ne, and 33.6 g of Kr in a piston-cylinder

    asked by Arian on October 18, 2010
  75. Chemistry-Rates of Reaction

    A chemist wishes to determine the rate of reaction of zinc with hydrochloric acid. The equation for the reaction is: Zn(s) + 2HCl(aq) ---> H2(g) + ZnCl2(aq) A piece of zinc is dropped into 1.00 L of 0.100 M HCl and the following data were obtained:

    asked by Juggy on April 18, 2010
  76. math

    As you and your spouse are discussing your monthly budget at the dinner table one night, you are both curious as to how much of your $325 car payment is going to principal and how much to interest. Knowing that you are paying an APR of 3.75% to the bank

    asked by emma on June 8, 2013
  77. stat

    Problem 2. THE PROBABILITY THAT A RANDOMLY CHOSEN SALES PROSPECT WILL MAKE A PURCHASE IS 0.20. IF A SALESMAN CALLS ON SIX PROSPECTS, A. WHAT IS THE PROBABILITY THAT HE WILL MAKE EXACTLY FOUR SALES? B. WHAT IS THE PROBABILITY THAT THE SALESMAN WILL MAKE

    asked by siddhi on May 1, 2012
  78. Chemistry

    How might one separate a mixture of water and salt? A solution of water and salt may be separated, if you don't want the water, by allowing the water to evaporate which will leave the salt crystals behind. If you want the water AND the salt, you may

    asked by Dave on September 9, 2006
  79. Chemistry

    What is the function of a salt bridge in a galvanic cell? 1. To permit electrons to flow through the solution. 2. To maintain a steady flow of reactants from the cathode to the anode. 3. To form complex ions with the products of oxidation at the anode. 4.

    asked by Anonymous on November 18, 2015
  80. chem

    Balance the equation and answer in terms of moles. Chlorine gas can be produced commercially by passing an electric current through a con-centrated solution of sodium chloride (brine). The unbalanced equation is NaCl(aq) + H2O(`) ! NaOH(aq) + Cl2(g) +

    asked by jack on February 15, 2012
  81. Chemistry

    At the beginning of a titration to standardize the NaOH solution, Student A adjusted very carefully the initial burette volume to 0.00 mL, but he did not notice an important air bubble in the tip of the burette. At the end of the titration, the air bubble

    asked by kobe on February 9, 2015
  82. math

    Make a model of a rectangular prism that is not a cube and has a surface area of 62 cm squared. What are the measurements of this rectangular prism? I know the formula, is 2ab+2bc+2ac=sa, and I know the answer to this problem... a=5, b=3, and c=2... I did

    asked by Elie on May 7, 2012
  83. mATH, ALGEBRA

    i need help solving the system by addition. 5x-7y=5 x+3y=1 this is what i think but i am not sure 3y=-x+1 y= -(1/3)x+(1/3) 5x - 7 (-1/3x + 1/3) = 5 5x+2.3333331x-2.3333331=5 7.3333331x-2.3333331=5 7.3333331x=7.3333331 x=1 x+3y=1 1+3y=1 3y=1-1 3y=0 y=0 so

    asked by jasort120 on April 13, 2007
  84. Chemistry

    Each of the following processes is spontaneous as described. Which one will have ∆H approximately equal to zero? 1. precipitating 1 mol of AgBr(s) from a solution of Ag+(aq) and Br−(aq) 2. 1 L He(1 atm, 298 K) + 1 L Ar(1 atm, 298 K) → 2 L He/Ar

    asked by Mary on March 1, 2012
  85. Chem

    What is the pH of the resulting solution if 30.00 mL of 0.100M acetic acid is added to 10.00mL of 0.100 M NaOH? For acetic acid, Ka=0.000018. I know that NaOH is a strong base and acetic acid is a weak acid. What is the equation: C6H5COOH+NaOH C6H5COOH

    asked by Sarah on February 27, 2008
  86. Physics

    Why does a piece of iron behave like a temporary magnet when placed in a magnetic field? SOLUTION: Iron consists of many small magnetic domains which all line up and temporarily behave like an ordinary magnet when iron is placed in an external magnetic

    asked by sally on May 27, 2009
  87. chemistry

    I was having trouble with this problem. initial pressure for the compounds involved in the reaction displayed were determined to be P(CO(g)) = 0.5794 atm, P(H2O(g)) = 0.5662 atm, P(CO2(g)) = 0.7950 atm, P(H2(g)) = 0.2754 atm. Calculate the value of the

    asked by andy on April 8, 2010
  88. Physics (A-level)

    A ball was projected horizontally at a speed of 0.52 m s–1 across the top of an inclined board of width 600 mm and length 1200 mm. It reached the bottom of the board 0.9 s later (Figure 4). Calculate: a the distance travelled by the ball across the

    asked by Jeffrey Jones on October 20, 2015
  89. Chem

    Consider a glass of 277 mL of water at 25°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved. To find the mass of water use the density of water = 1.0 g/mL. I have no idea how to

    asked by Don on February 1, 2011
  90. physics

    (a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 8.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very

    asked by Rachel on March 26, 2011
  91. chemistry

    What is the difference between a strong electrolyte and a weak electrolyte? Explain what makes an electrolytic solution strong or weak. Do you look at the pH to determine between a strong electrolyte and a weak one?

    asked by Anonymous on May 3, 2010
  92. MAth Please Help

    You are planning to spend no less than $6,000 and no more than $10,000 on your landscaping project. Suppose you want to cover the backyard with decorative rock and plant some trees as the first phase of the project. You need 30 tons of rock to cover the

    asked by Anonymous on June 3, 2008
  93. chem 101

    A 0.6753 g sample of an unknown metal was converted to the nitrate, MCl2, then a solution of the nitrate was treated with silver nitrate to give MCl2 (aq) + 2 AgNO3 → M(NO3)2 + 2 AgCl(s) silver chloride crystals. The silver chloride was isolated and

    asked by harley on March 17, 2012
  94. As physics

    Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Calculate the number of free electrons

    asked by cylinder on December 12, 2017
  95. CHEM

    Please help me, i don't know how to approach this question! All ammonium salts on heating with sodium hydroxide produce ammonia gas. From which ammonium salt can the greatest mass of ammonia be obtained? a)0.5 mol of (NH4)3PO4 b)0.5 mol of (NH4)2SO4 c)1

    asked by Marrion on October 20, 2009
  96. -MATH-

    h=-16t2+80t+96 Use this position polynomial to calculate the following: 1.The height of the object after 2 seconds 2.The height of the object after 4 seconds 3.How long the object will take to reach the ground? 4.Write the position function for an object

    asked by Steph on December 2, 2013
  97. physics

    A diver runs and dives off the end of a spring board that is 0.9 meters above the surface of the water. As she takes off from the diving board, her velocity is 5.2 m/s directed 36° above horizontal calculate: a) the time she is in the air s b) the

    asked by Mat on October 29, 2012
  98. thermodynamic

    an engine operates on the carnot cycle between the temperature limits of 250c and 50c. the pressure and the volume at the start of the isothermal expansion are 6 bar and 0.1 m^3 respectively. pressure after isothermal expansion is 3 bar. assume

    asked by abody alabady on April 9, 2015
  99. Science

    Magnesium oxide is not very soluble in water, and is is difficult to titrate directly. It's purity can be determined by use of a back-titration method. 4.06 g of impure magnesium oxide was completely dissolved in an excess of 0.20 mol/L for neutralization.

    asked by Cleopatra on March 31, 2019
  100. chemistry

    In the movie "The Raiders of the Lost Arc", Indiana Jones and his guide play catch with a gold idol. The idol had a volume of about 1.30 L. In order to determine whether they could really play catch with the idol, calculate the weight (in pounds) of the

    asked by anon on September 13, 2010

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