1. math

    A rectangular courtyard is 57m 50 cm long and 22m broad. Determine the least possible number of square stones of the same size required to pave it

    asked by faiq on July 31, 2017
  2. chemistry

    The volume of 0.15 mol dm ^-3 sulphuric acid,H2SO4 required to completely neutralise 25.0cm^3 of potassium hydroxide,KOH solution.

    asked by mandy on May 7, 2014
  3. real estate law

    Attorneys are required by state law to be: a. at least 26 years of age b. licensed c. living within 100 miles of the courthouse d. sworn to secrecy is it B

    asked by Nile on October 26, 2011
  4. Chemistry

    what is the specific heat of an unknown substance of 2000 j of energy required to raise the temperature of 4 grams of substances 5 degrees celsius

    asked by Tyran Wilson on April 30, 2014
  5. Analytical chemistry

    Calculate to four decimal places the mass of pure dry CaCO3 required to make 1 L of a 1000 ppm Ca stock solution.

    asked by Angel on October 20, 2016
  6. Chemistry

    If the CO2 is not removed by boiling after the addition of HCL, how will this affect the amount of NaoH required to reach the bromophenol endpoint. Explain.

    asked by Jordan on April 10, 2014
  7. chemistry

    20.0 g of CH3OH is frozen solid at -98.0 degrees C. What is the total energy required to melt it, warm the liquid to its boiling point, and then just vaporize it?

    asked by Bri on October 6, 2011
  8. Physics

    an aircraft lands on a runway with length of 205 m at a speed of 295 km/h what is the minimum constant deceleration required for a safe landing

    asked by mike on January 29, 2015
  9. AEJC , physics

    a flywheel of mass 200 kg is rotating at the rate of 8 rps . find the constant torque required to stop the disc in 11 rotations.

    asked by rutuja on June 24, 2017
  10. physics

    What is the required resistance of an immersion heater that will melt 6.39 kg of ice at 0°C in 36 min while operating at 110 V? im not too sure how to do this because delta_T=0. With the equations im using, i get 0 but its not the answer and im not quite

    asked by Mitch on May 19, 2010
  11. geometry

    afence is to be built on the diagnal of a rectangular dog park which is 250ft by 200ft to the nearest tenth of a foot. how much fence will be required?

    asked by ky on April 1, 2015
  12. chemistry

    The question is how many kilojoules are required to melt 24g of ice at 100 degrees celsius? Can you please correct me if im wrong. ( Which I'll probably will be ) I did: 24 x 333= 800kj

    asked by evelyn on May 20, 2010
  13. Math

    Scores on a marketing exam are known to be normally distribute with mean and standard deviation of 60 and 20, respectively. The syllabus suggests that the top 15% of the students will get an A in the course. What is the minimum score required to get an A?

    asked by Sam on September 25, 2014
  14. owning

    _________of the vehicle is the likely consequence of failture to make the required loan payments. A.Theft B.Repossession C.Destruction D.Loss of warranty i got D

    asked by Ciara on October 14, 2011
  15. Physics (I have a test tomorrow)

    What power is required to accelerates a 1980kg car from 30km/h to 70km/h against a constant force of resistance of 750N over a distance of 85m. Thank you for your help!

    asked by Laura on May 2, 2017
  16. gRammar

    Proofread the following sentences. Insert punctuation as required. After a Maylard incision was made through the abdomen a retractor was used for visualization of the pelvic contents.

    asked by Anonymous on December 12, 2015
  17. Mechanics

    Calculate the average horsepower required to raise a 200-kg drum to a height of 20 in a time of 1:0 minute. Show the solution and answer

    asked by Aries on September 15, 2013
  18. Chemistry

    Determine the number of grams of water which are required to dissolve a mixture of 25 g of KNO3 and 2.0 g of CuSo4 * 5H20 AT 100 Degrees celscius?

    asked by Jessica on February 9, 2011
  19. Chemistry 105

    Consider the following chemical reaction. 2H2O(l) -->2H2(g)+O2(g) What mass of H2O is required to form 1.6 L of O2 at a temperature of 330 K and a pressure of 0.954 atm?

    asked by JULIE on October 23, 2011
  20. Ranjeet Singh Model School

    How many paving stones, each measuring 80cm by 50cm are required to pavea rectangular courtyard 30m long and 20m broad??

    asked by Nirmal Singh on January 28, 2011
  21. physics

    The coefficient of kinetic friction for a 25 -kg bobsled on a track is 0.10.What force is required to push it down a 6.0^\circ incline and achieve a speed of 67 km/h at the end of 75 {\rm m}?

    asked by Anonymous on September 29, 2010
  22. Calculus

    For the function f(x) = x/(3x+1) find the equation of the line which is tangent to the curve f(x) at x=2. Solve analytically (an exact answer is required) Please show steps. Thanks.

    asked by James on May 11, 2011
  23. AP CHEMISTRY NEED HELP PLEASE

    What Volume of nitrogen at STP would be required to react with 0.100 mol of hydrogen to produce ammonia? N2(g) +3H2 (g)(arrow) 2NH3(g)

    asked by Mandy on December 9, 2011
  24. chemistry

    What volume of 0.050 M AgNO3, silver nitrate solution is required to reat completely with 60.0 mL of 0.025 M K2S, potassium sulfide?

    asked by AJ on March 14, 2015
  25. Chemistry

    What minimum volume of 3.0 M H2SO4 is required to produced 13 L of H2 at STP? Reaction formula: 2Al(s) + 3H2SO4(aq) --> Al2(SO4)3(aq) + 3H2 (g)

    asked by Diva on December 5, 2011
  26. physics

    if you wished to warm 100 kg of water by 15 degrees celsius for your bath, how much heat would be required? (give your answer in calories and joules)

    asked by maria on January 29, 2010
  27. Chemistry

    How much energy (in kilojoules) is required to convert 130mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL?

    asked by Annale on November 3, 2014
  28. government and economic

    Suppose big business had vigorously opposed the Sherman Antitrust Act, but that it had been passed anyway. What sort of politics would have been required for this to happen?

    asked by may on December 2, 2008
  29. chemistry

    the quantity of electricity required to reduce 12.3g of nitrobenzene to aniline assuming 50% current efficiency is 1. 115800 C 2. 57900 C 3. 231600 C 4. 28950 C

    asked by hriday on March 2, 2009
  30. accounting

    I am stumped on my last question which is using the discounted cash flow formula.... what effect will increase the required rate of return on the present value. I'm getting that it will be increased. Is this right?

    asked by Alexa on April 27, 2010
  31. Math

    Rectangular courtyard is 57m 50cm and 22m broad. Determine the least possible number of square stones of the same size required to pave it.

    asked by Noor on September 3, 2015
  32. finace

    _________ of the vehicle is the likely consequence of failure to make the required loan payments. A. Theft B. Repossession C. Destruction D. Loss of warranty

    asked by Tyesha on July 12, 2012
  33. chemistry

    Calculate the total amount (in moles) of Ca and Mg present in a sample of water that required 12.86 ml of 0.0005M EDTA solution to completely complex them.

    asked by Ana on March 29, 2010
  34. history

    what lifestyle changes were required by ordinary americans or teenagers during world war 2? please help me to find info about this topic for my short research report.

    asked by bindiya farswani on August 7, 2009
  35. Chemistry

    Can anyone answer this question please. (Determine the concentration of an aqueous NaCl solution if 31.5 mL are required to reach the equivalence point when titrated with 25.0 mL of 0.20 M AgNO3.)

    asked by John on September 20, 2010
  36. Math

    Hi everyone! May anyone please tell me how to tell how many zeroe's are required in your answer when moving the decimal points in converting metric units? Thank you very much! PLease help son, if possible, as I have a really big test coming up!

    asked by Anonymous on October 17, 2010
  37. Math

    A rectangular courtyard is 57m 50 cm long and 22m broad. Determine the least possible number of square stones of the same size required to pave it

    asked by Noor on September 9, 2015
  38. PHYSICS

    What is the angular momentum of a 2.7 kg uniform cylindrical grinding wheel of radius 12 cm when rotating at 1600 rpm? How much torque is required to stop it in 4.4 s?

    asked by Malin on November 30, 2010
  39. math

    A rectangular courtyard is 57m 50 cm long and 22m broad.Determine the least possible number of square stones of the same size required to pave it.

    asked by rose Dawson on August 20, 2016
  40. Physics

    A jack has a lever arm of 45cm and pitch of 0.5cm. If it's efficiency is 30%,what force is required to lift a load W of mass 1200kg

    asked by Majiri on September 16, 2017
  41. Calculus

    Determine how much time, to the nearest tenth of a year, is required for an investment to triple in value if interest is earned at the rate of 3.5% compounded continuously. (use A=Pe^rt

    asked by Jessica on September 21, 2010
  42. Math

    A rectangular courtyard is 57m 50 cm long and 22m broad. Determine the least possible number of square stones of the same size required to pave it

    asked by Noor on September 9, 2015
  43. english

    what lifestyle changes were required by ordinary americans or teenagers during world war 2? please help me to find info about this topic for my short research report.

    asked by bindiya farswani on August 7, 2009
  44. Chemistry

    What mass of MgSO4 · 7H2O is required to prepare 800 mL of a 0.442MMgSO4 solution? Answer in units of g. Would you use the formula M1V1=M2V2?

    asked by Mike on October 11, 2010
  45. Chemistry

    What volume in mL of .100 M NaOH would be required to titrate a 297 mg sample of a weak acid with an equivalent weight of 126 grams?

    asked by Telly on December 1, 2009
  46. chemistry

    If 0.0490 mol of solid Al reacts stoichiometrically according to the balanced equation with 990 mL of aqueous Cl-, what molarity (M) of Cl- is required? 3 CuCl2(aq) + 2 Al(s) → 3 Cu + 2AlCl3(aq)

    asked by eng on April 3, 2010
  47. physics

    An automobile manufacturer claims that its product will travel 1.2 km in 27 s, starting from rest. What is the magnitude of the constant ac- celeration required to do this? Answer in units of m/s2.

    asked by Anonymous on November 18, 2010
  48. Chemistry

    Calculate the number of milliliters of 0.782 M KOH required to precipitate all of the Mn2+ ions in 112 mL of 0.461 M Mn(NO3)2 solution as Mn(OH)2.

    asked by Jessica on October 16, 2014
  49. PHYSICS

    Calculate a constant force required to bring an object of mass 2.0kg.moving with a velocity of 4.0m/s to rest in. 0.1sec and 2metre

    asked by ABDILLAH on August 6, 2018
  50. chemistry

    How much Tris-Acetate-EDTA (TAE) stock buffer (3.25 M) is required to make 400 ml of solution that has a concentrations of 250 mM? How much water?

    asked by Abass on July 8, 2013
  51. Chemistry II

    Determine the grams of solute required to prepare 0.5 m solution HC2H3O containing 750 g of water. Make sure to show your work. **(Thanks for helping by the way.)**

    asked by Chrystal on January 23, 2014
  52. physics

    What is the angular momentum of a 2.43 kg uniform cylindrical grinding wheel of radius 12.5 cm when rotating at 1600 rpm? (b) How much torque is required to stop it in 8.00 s?

    asked by Anonymous on October 28, 2014
  53. Chemistry

    Asprin, c9h804, is produced through the following reaction of salicyclic acid, c7h6o3, and acetic anhydride, c4h6o3. chemical equation: c7h6o3 + c4h6o3 yields c9h8o4 + hc2h3o2 (all numbers in this equation are subscripts) At 20 degrees Celsius. how many

    asked by Steph on January 21, 2007
  54. Physics => speed of sound variation

    The speed of sound in air (m/s) depends on temperature according to aprox expression of v= 331.5 + 0.607 Tc Tc= temp in celcius In dry air, temperature decreases about 1deg celcius for every 150m rise in altitude. a) assume the change is constant up to

    asked by ~christina~ on February 20, 2008
  55. math

    A bourbon that is 51-proof is 25.5% alcohol by volume while one that is 82-proof is 41% alcohol by volume. How many liters of 51 proof bourbon must be mixed with 1.0-L of 82 proof bourbon to produce a 66 proof bourbon? Give answer to three decimal places.

    asked by Lorie on April 5, 2013
  56. Chemistry

    What volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia? (assume constant temprature and pressure) Balanced equation- N2 + 3H2= 2NH3 After finding this answer, what volum of ammonia is produced in this reaction? 1.

    asked by Kylen on January 28, 2007
  57. Biology

    To survive as an individual, all animals must maintain homeostasis. Which of the following is NOT a part of homeostasis? A.eliminating wastes from their body B. gathering and responding to information in their environment C. reproduction- to produce viable

    asked by Cassandra on May 18, 2017
  58. chemistry

    1 gm of magnesium is burnt in a closed container which contains 2 l of air at ntp containing 21 percent oxygen by volume find limiting reagent, mass of excess reagent left over, mass of mgo produced, number of mg and oh ion formed by dissolving it with

    asked by David on January 15, 2016
  59. chemistry

    iron+sulphur together are a mixture of small grains yellow and dark grey.Its chemical symbol is 'Fe + S'.When it reacts with oxygen they create a new chemical substance; Iron Sulphide. What do you put for 'explain the reaction using the Big Idea of Energy?

    asked by jess on April 10, 2011
  60. Chemistry 130

    Can someone please help me with these questions? 1 (7). Rank the following in order of increasing radius based on their positions on the periodic table: S, S-2, Cl a. S, S-2, Cl b. S-2, Cl, S c. Cl, S, S-2 d. Cl, S-2, S e. S, Cl, S-2 6 (16). Methane burns

    asked by Jessie on September 8, 2009
  61. Physics

    In cold climates, including the northern United States, a house can be built with very large windows facing south to take advantage of solar heating. Sunlight shining in during the daytime is absorbed by the floor, interior walls, and objects in the room,

    asked by Laketa on April 17, 2012
  62. business law

    mark was a muktihandicapped student needing special education. mark parnets and the school board signed ann agreement that required the board to pay the placement costs for mark at a residential school. the Bemedoctome school at the current annual rate of

    asked by Anonymous on September 28, 2010
  63. chemistry

    I have 3 grams of CaCI2 and dissolve this into 0.5 L water. What is the concentration in g/dl (grams/deciliter)? I take 10 milliliters of this solution and add it to 990 milliliters of watet fo a total of 1000 milliliters. What is the concentration of this

    asked by maria on September 17, 2014
  64. chemistry pls help me asap

    2.08g of metal Y react with 0.96g of oxygen to form a metal oxide.The empirical formula of the metal oxide is Y2O3.What is the relative atomic mass of metal Y.

    asked by mandy on May 15, 2014
  65. science

    when can the plant start to make its own food? A plant always makes its own food. Ever since it existed it made its own food through photosynthesis. The leaves take in the sunlight and form it into food. It also releases oxygen.

    asked by christina on February 27, 2007
  66. Chemistry (mol)

    2CO + O2 → 2CO2 If 3.4 moles of carbon dioxide (CO2) form at the end of the reaction, how many moles of carbon monoxide (CO) and oxygen gas (O2) entered the reaction?

    asked by Summer on March 24, 2018
  67. chemistry

    A 2.077g sample of an element which has an atomic mass between 40 and 55 reacts with oxygen to form 3.708g of an oxide. Determine the formula mass of oxide ( and identify the element)

    asked by Chansa on May 4, 2016
  68. Chemistry

    Calculate the ratio of the effusion rate of oxygen gas (O2) to that of nitrogen gas (N2). Express your answer in decimal form and calculate your answer to at least four sig figs.

    asked by Mary on September 23, 2010
  69. Chemistry

    Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, ant the rest is nitrogen. If a tank of Trimix 10/50 has a total pressure of 2.07 x 10 4 kPa, then what is the partial pressure of helium?

    asked by kathy on February 13, 2017
  70. science help.. pls help me dr.bob22 or damon

    In a water molecule, 2 atoms of hydrogen and 1 atom of oxygen share electrons. A _______ bond, is found in water molecule is it chemical bond pls help me

    asked by Oscar on March 31, 2015
  71. Chemistry

    4 L of oxygen at a pressure of 400 Kpa and 1L of nitrogen at 200 Kpa were introduced in to 2 L vessel. (A)What is the total pressure of the gases in the vessel. (B)What is the mole fraction of each gas?

    asked by Yeneta on September 1, 2012
  72. chemistry

    How many grams of carbon dioxide can form when a mixture of 3.60 g ethylene (C2H4) and 2.70 g of oxygen is ignited, assuming complete combustion to form carbon dioxide and water?

    asked by me on January 25, 2012
  73. Chemistry

    An unknown metal, m, forms an ionic compound with the formula, M2S3. Which formula represents the compound formed by the metal with oxygen? a) MO b) MO2 c) MO3 d) M2O3

    asked by Anonymous on May 7, 2017
  74. Science

    What is the function of a cell wall? 1.to protect and sopport the cell****** 2.To perform different functions I’m each cell 3.To prevent water from passing through the cel 4.to prevent oxygen from entering the cell

    asked by Annie:~) on October 22, 2017
  75. Chemistry

    Is the reaction of 8 grams of natural gas and 38 grams of oxygen gas to form 17 grams of carbon dioxide in 19 grams of water consistent with the law of conservation of mass?

    asked by Sparky on February 6, 2015
  76. integrated chemistry and physics

    In a water molecule, two hydrogen atoms bind to one oxygen atom. How many lone pairs of electrons will be shown around each hydrogen atom in the Lewis structure of water?

    asked by tms on February 6, 2015
  77. Chemistry

    A compound is found to contain 50.05 % sulfur and 49.95 % oxygen by mass. What is the simplest (empirical) formula for this compound? They said to assume that it is 100 grams. I found the molar mass. S- 32.06 0-16.00 But now I don't know what to do. Please

    asked by Jordan on August 27, 2015
  78. chemistry

    An analysis of an unknown compound found it contained 40 g potassium, 52 g chromium and 56 g of oxygen. a) What is the empirical formula for this compound? Show the work you did to determine the formula. b) What type of compound is it, ionic, covalent or a

    asked by cam on December 14, 2010
  79. Chemistry

    Silver oxide is used in small batteries called button batteries (Figure below). It decomposes upon heating to form silver metal and oxygen gas. 2Ag2O(s) → 4Ag(s) + O2(g) How many moles of silver are produced by the decomposition of 4.85 g of Ag2O?

    asked by Makayla Brad on November 13, 2015
  80. Physics

    What is the total pressure, in atmospheres, of a 10.0 L container that contains 10 moles of nitrogen gas and 10 moles of oxygen gas at 300 K? I tried using PV=nRT and added both P together but kept getting the wrong answer. n=10, T=300 K, V=1x10^-3 m^3

    asked by Anon on June 27, 2014
  81. Chem

    A sample of an unknown biochemical compound is found to have a percent composition of 55.03 percent carbon, 5.54 percent hydrogen, 32.10 percent nitrogen and the balance oxygen. What is the simplest formula for this compound ? How do I do this?

    asked by Melinda on October 5, 2012
  82. Chemistry

    Analysis of a sample of an organic compound showed it contains 39.9%carbon,6.9%hydrogen and 53.2%oxygen. a)calculate the empirical formula b)if the relative molecular mass is 60,what is the molecular formula of the compound.(C=12,H=1,O=16)

    asked by Angel on December 19, 2015
  83. Chemistry

    A sample of oxygen gas at 295 kPa takes up 456 L of space at standard temperature (the “T” in STP). What is the new volume when the pressure is lowered to standard pressure (the “P” in STP)?

    asked by Bianca on February 27, 2014
  84. Physics

    Please show steps and thank you! An astronaut of mass 70 kg carries an empty oxygen tank of mass 14 kg. He throws the tank away from himself with a speed of 3 m/s. With what velocity does the astronaut start to move through space?

    asked by Anon on January 14, 2012
  85. Chemistry

    If 0.200mol of nitrogen gas and 0.200mol of oxygen gas react, what is the limiting reactant? N2(g)+O2(g)→2NO(g) How many moles of NO are produced according to the equation? Please show how to perform this equation with the answer please.

    asked by Tonya on October 26, 2014
  86. Science

    Lack of oxygen in a pond may be a limiting factor. True or False? Please reply ASAP, thanks. Limiting factor for what? For fish and other animal life, this would be true. I hope this helps. Thanks for asking.

    asked by Marry on May 18, 2007
  87. Chemistry

    How do you figure out how mch oxygen gas escaped when Potassium Chlorate is decomposed in a reation? Also what mass of Potassium Chlorate was decomposed in the experiment? I conducted the experiement but don't know how to do this.

    asked by Becca on September 3, 2012
  88. Chemistry

    In the balanced equation for the combustion of 2,2,4-trimethyloctane (C11H24), the coefficient of the organic compound is...the coefficient of oxygen gas is ...the coefficient of carbon dioxide gas is...and the coefficient of liquid water is.

    asked by Anonymous on July 9, 2012
  89. Chemistry

    In an experiment 10.124 g of magnesium is reacted with 4.273 g of oxygen gas according to the equation: Mg + O2 ==> MgO. A. What is the limiting reactant? B. What mass of the other reactant is in exess? C. What mass of MgO is produced?

    asked by tyler on February 29, 2008
  90. chem repost

    write a balanced equation for:Gaseous carbon dioxide and liquid water react to produce aqueous glucose (C6H12O6) and oxygen gas. I try but everytime i change the coefficient it makes the other elements unbalanced. the starting formula i got was: CO2(g) +

    asked by hannah on November 21, 2010
  91. chem

    write a balanced equation for:Gaseous carbon dioxide and liquid water react to produce aqueous glucose (C6H12O6) and oxygen gas. I try but everytime i change the coefficient it makes the other elements unbalanced. the starting formula i got was: CO2(g) +

    asked by hannah on November 21, 2010
  92. science

    Octane (C8H18) is a liquid that combusts with oxygen gas (O2) to form water (H2O) and carbon dioxide (CO2). Write a balanced chemical equation for this reaction and explain the scientific principle (statement) that requires the balancing of an equation to

    asked by Bookworm on June 25, 2015
  93. Chemistry

    Hello! I am having a little difficulty answering these two questions on my homework, I was wondering if anyone could please help me out! Thank you! 1) Consider the following balanced chemical equation for the neutralization reaction of calcium hydroxide

    asked by T.C. on November 30, 2013
  94. "Given Molality, calculate..."

    "Given: An aqueous solution of C6H12O6 with a density of 1.18 g/ml" I) Calculate Molarity 1) It firsts asks me to, "State the moles of solute" 2) Calculate the mass of the solute in grams - I think I can do this if I know how to get #1 3) Later it also

    asked by Rachel on November 19, 2006
  95. Writing

    Throughout this course, you will be asked to reflect on various topics in journal entries. Your Topic 2 entry will be about your program of study. The purpose of writing the journals is to provide you with an informal way of learning to express yourself

    asked by Alvis on May 30, 2018
  96. Check my Science questions?

    1. Why is it rare for the soft parts of an organism to become a fossil? The soft parts take a long time to decay. The soft parts can be eaten by other animals. The soft parts cannot be buried in sediment. The soft parts form petrified fossils. 2. Which of

    asked by Princess Anna on December 11, 2013
  97. Science help,Anyone?

    1. Why is it rare for the soft parts of an organism to become a fossil? The soft parts take a long time to decay. The soft parts can be eaten by other animals. The soft parts cannot be buried in sediment. The soft parts form petrified fossils. 2. Which of

    asked by Princess Anna on December 10, 2013
  98. Chemistry

    1.578 g of an unknown hydrocarbon (110.7 g/mol) burns in bomb calorimeter in excess oxygen. The heat capacity of the calorimeter,Cv, = 5.709 kJ/ºC and ΔT =7.995 ºC. Find ΔE for this hydrocarbon in kJ/mol.

    asked by JUNDY on March 31, 2015
  99. Chemistry

    According to your calculations a reaction should yield 5.67 g of oxygen O2. What do you expect the volume to be at 23 degrees C and 0.985 atm? I got the all the amounts 5.67 g 23 degrees C = 296 K .985 atm And use the ideal gas law Can you help me out by

    asked by Lauren on October 23, 2007
  100. general science

    A Compound Containing 3 Atoms Of Carbon And 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The Two End Products Of This Equation Are Carbon Dioxide And Water. What Element Should You Look At First In Balancing This Equation?

    asked by jennifer on August 9, 2009