1. Chemistry

    How much heat is required for 32.5g of Na2co3 to completely decompose?

    asked by Jan on June 5, 2015
  2. chemistry

    how many moles of H2SO4 are required to react with 2.63 mol of AL

    asked by mark miles on September 30, 2011
  3. chemistry

    Explain what is required to create a buffer that needs to protect the pH between 8.1 and 8.5

    asked by Ciara on December 8, 2010
  4. chemistry

    what mass NaOH is required to react exactly with 25.0 ml of 3.0 M H2S04

    asked by Larry on July 1, 2012
  5. Biology

    Explain how mitosis and cytokinesis are required for growth

    asked by Hails on October 22, 2018
  6. w

    i would like to know on what is required for a high chance to get accepted to uc berkeley

    asked by Tinm on October 3, 2013
  7. 11th grade chemistry

    in 1D there are 4g of Zinc. How many moles of Barium Hydroxide are required?

    asked by Amanda on April 13, 2010
  8. Chem 101

    How many calories are required to raise the temperature of 24.4 g of water by 27.8°C

    asked by lucy on July 27, 2011
  9. Chemistry

    What mass of Ca(OH) 2 is required to make 1.5 l of a 4.0% (w/v) solution of Ca(OH)2 in water?

    asked by H on September 19, 2012
  10. physics science

    if you wish to warm 95 kg of water by 20.0c for your bath how much heat is required

    asked by mary on October 30, 2011
  11. chemistry

    how many mL of 0.15 M NaOH solution are required to neutralize 35.00 mL of 0.22 M HCl

    asked by sonya on November 11, 2011
  12. chem121

    how many moles AL(OH)3 are required to completelyreactwith 2.75 molesof H2SO4?

    asked by ngugi on June 29, 2010
  13. Math

    How much foil is required to cover a rectangular box that is 4 in by 8 in by 5 in?

    asked by Chelle on November 28, 2010
  14. Physics

    What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?

    asked by Erica on December 2, 2010
  15. Chemistry

    How many mL of 3.0 M HCL are required to neutralize 250 mL of 2.0 M MgCL2 ?

    asked by David on March 23, 2012
  16. Chemistry

    How much heat is required to melt 110g of ice at-45°C?

    asked by Anna on October 20, 2016
  17. chemistry

    calculate the L of 5.00 M HCI required to neutralize 500.0 mL of 1.00 M Ca (OH)2

    asked by maria on April 9, 2013
  18. Chemistry

    How many milliliters of 8.40×10^2M Ba(OH)2(aq) are required to titrate 48.65mL of 5.26×10^2M HNO3?

    asked by Kaylee on October 6, 2010
  19. government

    Why are people required to join a political party??

    asked by boooobaby on September 10, 2008
  20. Chemistry

    What is the required volume of an acid to prepare 2 L of solution a 10% (v/v).

    asked by Dylan on July 5, 2016
  21. Chemistry

    How much heat is required to warm 1.50 kg of sand from 20.0 C to 100.0 C?

    asked by Derek on March 20, 2012
  22. chem

    how many ml of 0.15 m naoh solution are required to neutralize 35.00 ml of 0.22 m hcl

    asked by Anonymous on April 23, 2010
  23. Science

    During Active and Passive transport is ATP required?

    asked by joe on January 23, 2008
  24. Pure mathematics, geography, tourism and life orientation

    What career is required if I do these subjects and what courses do I need in tertiary?

    asked by Sine Thabiso on August 10, 2015
  25. fish

    what is required for goldfish to retain bright colors?

    asked by mike on October 6, 2008
  26. S.S.

    what was unique about the terrain of Vietnam that required the use of this chemical?

    asked by S.s. on April 13, 2017
  27. geometry

    how much foil is required to cover a rectangular box that is 4 in. by 8 in. by 5 in.?

    asked by Anonymous on June 14, 2010
  28. 8th grade, science

    What recources would be required for establishing a colony in space.

    asked by unknown on October 15, 2010
  29. chemistry

    What volume of 0.1 M NaOH is required to neutralize 30 mL of 0.1 M HCl?

    asked by Anonymous on February 12, 2013
  30. Physics

    How much heat is required to raise the temperature of 70 g of water from 20 C to 80 C?

    asked by Abida on January 17, 2011
  31. chemistry

    How many Milliliters of 3.50 M HCl (aq)are required to react 5.75g of Zn(s)?

    asked by Shawna on November 3, 2014
  32. chemistry

    How many grams of na cl are required to make 500ml of a 0.65 percent w/v

    asked by devin on December 6, 2011
  33. physics

    How many joules of heat are required to melt 20.0 kg of ice at 0°C?

    asked by ben green on November 6, 2014
  34. science

    how much of naoh is required to neutralize 1500 ml of 0.1 N hcl

    asked by Anonymous on November 20, 2012
  35. sonogram physics

    How much time is required to image a structure at 5cm.?

    asked by sue on May 23, 2013
  36. chemistry

    how much heat is required to vaporise 2 litres of ethanol

    asked by liu on May 2, 2011
  37. chemistry

    How much 6M HNO3 will be required to decrease the pH of 5000L solution of pH=9.6 to pH=3?

    asked by vidya on January 4, 2013
  38. science

    What force is required to accelerate a 1,000 kg car 5 m/s2?

    asked by gp on September 1, 2010
  39. chemistry

    How many milliliters of 3.60 {\rm M} {\rm HCl} are required to react with 140 {\rm mL} of 1.60 {\rm M}{\rm Al}({\rm OH})_{3}?

    asked by Ivy on April 23, 2011
  40. AE

    where can i find the steps required for a multicultural classroom?

    asked by scooby91320002 on July 6, 2008
  41. math

    (2.85*10^4)(3.67*10^6)= ? in scientific notation 3-4 digit answer required

    asked by waffles on September 13, 2012
  42. English

    What type of FONT is required for academic papers please? Thank you

    asked by Wanda on April 19, 2008
  43. science

    How much energy is required to lift a 40.00 kg bag of sand 1.02 m

    asked by Bethany on April 5, 2018
  44. physics

    what potential difference is required to pass 3.0 A through 28 ohm's

    asked by pablo on February 22, 2011
  45. Life science

    Name any 3 mineral elements that are required for the formation of membremes.

    asked by Matebane Jack on January 21, 2014
  46. chemistry

    how many mL of a .25 M HCL would be required to neutralize completely 30mL of a .2 M Ca(OH)2

    asked by samantha on September 15, 2007
  47. Anal chem

    how much 0.1F HC2H3O2 is required to make 500 ml of solution with a Ph of 4.0?

    asked by gigi on August 6, 2017
  48. math (significant digits)

    (3.x10^-2) + (0.2) round to significant digits required

    asked by AMELIA on June 10, 2016
  49. chemistry

    How many kilocalories are required to produce 1.83mol of aluminum?

    asked by dakota on March 9, 2015
  50. biology

    Name any 3 mineral elements that are required for the formation of membrenes.

    asked by Matebane Jack on January 21, 2014
  51. Chemistry

    How much 1.0 M NaOH would be required to completely neutralize 40.0 mL of 0.60 M HCl?

    asked by Cary on April 3, 2013
  52. renwewable energy

    How much energy is required to accelerate a 8000 kg car from 14 km/h to 95 km/h?

    asked by christian on January 29, 2011
  53. physics

    Two instances during which the heating effect of current is not required

    asked by chidinma on June 13, 2017
  54. Math

    A and B are two events. P(A/B)=5/11 P(A~B)=9/10 (~ indicates either A or B) P(B)=x How do we find P(A^B')? (^ indicates both A and B) I got, P(A^B)=5x/11 P(A)=(9/10)-(6x/11) Is there any way we can get a relationship between P(A^B) and the required

    asked by Ben on July 28, 2017
  55. chemistry

    If you have 64.3 g NH3, how many grams of F2 are required for complete reaction?

    asked by zdood on February 15, 2011
  56. chemistry

    How many photons will be required to raise the temperature of 2.0 g of water by 2.5 K?

    asked by Anonymous on November 13, 2009
  57. education

    Steps required for a multicultural education to be effective. According to J.A.Banks the steps required for a multicultural classroom to be effective is you must have multicultural education policy statement and supports diversity, the staff should have

    asked by scooby91320002 on March 15, 2009
  58. chemistry

    A crude oil burned in electrical generating plants contains about 1.2 % sulfur by mass. When the oil burns, the sulfur forms sulfur dioxide gas: S (s) + O2 (g) = SO2 (g). How many liters of SO2 (d=2.60 g/L) are produced when 1.00X 10 to the 4th kg of oil

    asked by kayla on August 2, 2008
  59. physics

    Two hundred liters of gas at zero degrees Celsius are kept under a pressure of 150 kPa. The temperature of the gas is raised to 273 degrees Celsius and the pressure is increased to 600 kPa. What is the new volume?

    asked by Anonymous on April 1, 2011
  60. chemistry

    Molarity is defined as moles/volumesolution What is the molarity of a solution of silver perchlorate, AgClO 4 , if 3.2 moles of silver perchlorate is dissolved in 1.5 liters of water? Is it 2.133 M, 4.756 M, 4.8 M, or 4.810 M ? it is 4.756

    asked by bobpursley on December 7, 2006
  61. physics

    Your physics teacher drives an ideal frictionless car of mass 1000 kg which coasts along the level road to his home at a constant speed of 48 km/h with the engine turned off. It then coasts 40 m up his sloping driveway and comes to rest at the top without

    asked by Jen on November 3, 2012
  62. math

    the total capacity of 1 carton is the same as the total capacity of 2 identical cups. If 1.8 liters of water are needed to fill up 3 identical cups and 2 identical cartons, what is the capacity of a cup? express your answer correct to 2 decimal places

    asked by heather on October 17, 2013
  63. Math

    A painter bought some paint for $500. He paid $x for each litre of paint. He accidentally spilt 5 liters of paint and sold the remainder of the psint for $2/litre more than he paid for it. If he made a profit of $40, find the amount he paid for each litre

    asked by Jon on March 18, 2015
  64. business law

    1.Why is personal jurisdiction an issue for those who post Websites? 2.What are some reasons that a website owner might be concerned with whether a court is able to obtain 'personal jurisdiction' over them? 3.What is normally required for a court to have

    asked by Jennifer on July 20, 2010
  65. physics

    Two 0.55 kg basketballs, each with a radius of 15 cm, are just touching. Ignore any other gravitational interactions. (a) How much energy is required to change the separation between the centers of the basketballs to 1.0 m? (b) How much energy is required

    asked by Kelly K. on June 11, 2007
  66. Chemistry

    Suppose that 50.0 mL of 0.25 M CH3NH2(aq) is titrated with 0.35 M HCl(aq). (a) What is the initial pH of the 0.25 M CH3NH2(aq)? (b) What is the pH after the addition of 15.0 mL of 0.35 M HCl(aq)? (c) What volume of 0.35 M HCl(aq) is required to reach

    asked by Dana on November 3, 2010
  67. College Chemistry

    1) A 25mL sample of the .265M HCI solution from the previous question is titrated with a solution of NaOH. 28.25mL of the NaOH solution is required to titrate the HCl. Calculate the molarity of the NaOH solution. 2) A 1.12g sample of an unknown monoprotic

    asked by Jessica on October 25, 2010
  68. Chemistry

    Suppose it is a hot summer day (40.0 degrees C = 104.0 degrees F), and you have left a can of hairspray outside so the gas within it is now at the same temperature of its surroundings. As part of your chemistry lab class, you have to build a safe and

    asked by Tonya on March 16, 2013
  69. Chemistry

    Suppose it is a hot summer day (40.0 degrees C = 104.0 degrees F), and you have left a can of hairspray outside so the gas within it is now at the same temperature of its surroundings. As part of your chemistry lab class, you have to build a safe and

    asked by Anonymous on March 16, 2013
  70. Math

    2. Which would you measure in kilograms? A. the mass of a butterfly B. the capacity of a bottle C. the mass of a dog

    asked by keykat on March 16, 2016
  71. Science

    Check this Compare renewable and nonrenewable energy sources, and discuss the effects of each on biodiversity. My answer Renewable resources are things like the wind and sun. You will never run out of these things. Nonrenewable resources are things like

    asked by Ange on April 29, 2016
  72. chemistry

    A sample of oxygen that occupies 1.00x10^6 mL at 575 mm Hg is subjected to a pressure of 1.36 atm. What will the final volume of the sample be if the temperature is held constant? How would I set up this equation?

    asked by kate on March 4, 2013
  73. chemistry

    If 987g of oxygen gas reacts completely with hydrogen gas, what volume of water vapor will be produced (in L) at 0.954 atm and 465 degree=es celcius?

    asked by Kierstin on May 13, 2016
  74. Chemistry

    A 0.5438 g sample of a compound contains only C H and O was burned completely in oxygen.the products were 1.0390 g CO2 and 0.6369g H2O. Determine the empirical formula of thr compound

    asked by Aontor on May 17, 2016
  75. Chem.

    2SO2(g) + O2(g) ---> 2SO3 It says that 12.0 L of sodium trioxide are produced at 100 degrees celcius. What volume of oxygen is produced? How would I go about doing this. I was going to use PV=nRT but I dunno the pressure so I can't find the moles. What do

    asked by Lena on December 11, 2008
  76. Biology

    Please help: In glycolysis followed by either lactic acid or alcoholic fermentation produce _____ ATP molecules, while cellular respiration using oxygen produces ____ ATP. 1) 2,8 2) 4,2 3) 2,4 4) 2,38 Thanks a million!

    asked by Amy on November 16, 2011
  77. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 11, 2013
  78. chemistry

    What is Dalton's law of partial pressures? Explain how this law relates to the fact that mountain climbers must carry tanks of oxygen when scaling high peaks.

    asked by Dan on August 4, 2008
  79. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 10, 2013
  80. Science

    Balanced chemical equation for the carbon monoxide gas for motor car engines combines with the oxygen gas in the air to produce carbo dioxide

    asked by Sibusiso on September 27, 2010
  81. chemistry

    Fumaric acid, which occurs in many plants, contains, by mass, 41.4% carbon, 3.47% hydrogen, and 55.1% oxygen. A 0.050-mol sample of this compound weighs 5.80 g. The molecular formula of this compound is

    asked by Tierney on October 6, 2009
  82. Chemistry

    4Al + 3O2 = 2Al2O3. If 41.5 g aluminum and 69.0 g oxygen undergo a reaction that has a 67.0% yield, What mass of aluminum oxide forms. Please help by showing steps to find answers. Thanks

    asked by Pamela on July 17, 2011
  83. chemistry

    I was trying to do a balanced reaction equation to show cyanide being oxidized by hypochlorite ion to cynate. I wasn't sure if there needed to be oxygen in the equation too. CN + NaOCl = OCN + NaCl

    asked by Mel on April 7, 2010
  84. chem

    2H2(g)+ O2(g) --> 2H2O(L) I know the oxidizing agent is oxygen and the reducing agent is hydrogen. what are the number of electrons transferred in the balanced chemical equation? (I put 2 and tried -2 but it didn't seem right)

    asked by tami on October 5, 2011
  85. Chemistry

    What mass, in grams, of oxygen gas (O2) is contained in a 10.5 liter tank at 27.3 degrees Celsius and 1.83 atmospheres Trouble figuring out what formula to use to get the answer...want to understand how to get the right answer

    asked by Anonymous on July 24, 2011
  86. chemistry

    I have the same question as Chopsticks determine the emperical formula of the compound 25.3%copper, 12.9%sulphur, 25.7% oxygen, 36.1% water Can the answer be CuSO4(H2O)5? or does it have to be CuSO4 x 5H2O thanks in advance.

    asked by sh on January 16, 2009
  87. chemistry

    a 47.7L sample of a gaseous hydrocarbon, measured at 1.00atm and 25degreesC is burned in excess oxygen, liberating 4.33X10^3 kJ of heat at a constant pressure. what is the identity of the hydrocarbon?

    asked by Ellie on June 21, 2010
  88. Chemistry

    4NH3 + 7O2 --> 4NO2 + 6H20 1) How many grams of oxygen are necessary to produce 4.50 moles of NO2? 2) How many molecules of water are produced when 2.25 moles of ammonia are completely reacted?

    asked by anonymous on November 24, 2007
  89. CHEMISTRY URGENT!

    a sample of oxygen that occupies 1.00 x 10^6mL at 575mmHg is subjected to a pressure of 1025atm. what will the final volume of the sample be if the temperature is held constant? how do uu set up the equation

    asked by kacie on February 3, 2013
  90. Chemistry

    How many moles of aluminum oxide can be produced from 12.8 moles of oxygen gas (O2) reacting with excess aluminun (Al)? useing this equation: ---- I don't get how to do these? 4Al(s) + 3O2--> 2Al2O3(s)

    asked by Jane on April 14, 2011
  91. Chemistry

    Suppose the atmospheric pressure during the experiment was 751 mmHg. The temperature of the water was found to be 23.0 degrees celsius. What is the pressure of the oxygen gas, Po2 that is produced?

    asked by Casey on September 27, 2012
  92. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 12, 2013
  93. chem

    How much heat (in {kJ}) evolves when 7.0L of C2H2(d = 1.0967kg/m^3) is mixed with a stoichiometric amount of oxygen gas? The combustion reaction is C2H2+ 5/2 O2-> 2 CO2+ H2O, Delta H=-1299.5 kJ

    asked by Chironjit on November 19, 2012
  94. physics/chem

    Calculate the number of coulombs of positive charge in 261 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton; an oxygen atom contains eight protons.)

    asked by dave on March 31, 2008
  95. chemistry

    This has to do with law of conservation of mass I believe but it stumps me. 50g or iron reacts with 21g of oxygen to form how many gram of iron oxide? Is the answer 71g or 29g

    asked by ben on September 3, 2011
  96. chemistry

    Consider the following reaction 4Al + 3O2 = 2Al2O3 It takes 2.00 L pure oxygen gas at STP (0C ,1atm ) to react completely with a certain aluminum. What is the mass of aluminum reacted?

    asked by NONO on November 18, 2011
  97. Chemistry

    100 cm3 of alkane X with the general formula CxHy requires 650 cm3 of oxygen for complete combustion. Deduce the structural formulae for the isomers of X.

    asked by Jade on December 17, 2014
  98. Chemistry

    50cm'3 of sulphur (iv) oxide were produced at s.t.p when some quantity of powdered sulphur were burnt in excess oxygen.state the equation for the reaction Ans S+O2g-2SO2

    asked by Anonymous on June 1, 2015
  99. chemistry

    Aluminum metal is exposed to atmospheric oxygen, it is oxidized to form aluminum oxide. How much heat is released by the complete oxidation of 24.2 grams of aluminium at 25°C and 1atm.

    asked by Diana on October 13, 2012
  100. chemistry help

    Determine the empirical formula for each substance. 1. A dead alkaline battery is found to contain a compund of Mn and O. Its analysis gives 69.6% Mn and 30.4% O. 2. A compound is 38.77% Cl and 61.23 %O. 3. Magnetic iron oxide is 72.4 % iron and 27.6%

    asked by peter on March 23, 2009