1. 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
  2. Life science

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

    asked by Matebane Jack on January 21, 2014
  3. 8th grade, science

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

    asked by unknown on October 15, 2010
  4. biology

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

    asked by Matebane Jack on January 21, 2014
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. Science

    During Active and Passive transport is ATP required?

    asked by joe on January 23, 2008
  11. 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
  12. chem121

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

    asked by ngugi on June 29, 2010
  13. 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
  14. 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
  15. chemistry

    what frequency of radiation in Hz is required to ionise helium?

    asked by Anonymous on September 19, 2010
  16. government

    Why are people required to join a political party??

    asked by boooobaby on September 10, 2008
  17. physics

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

    asked by pablo on February 22, 2011
  18. Biology

    Explain how mitosis and cytokinesis are required for growth

    asked by Hails on October 22, 2018
  19. chemistry

    how much heat is required to vaporise 2 litres of ethanol

    asked by liu on May 2, 2011
  20. Chemistry

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

    asked by Anna on October 20, 2016
  21. 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
  22. science

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

    asked by gp on September 1, 2010
  23. sonogram physics

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

    asked by sue on May 23, 2013
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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
  52. 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
  53. 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
  54. 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
  55. 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
  56. 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
  57. 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
  58. 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
  59. 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
  60. 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
  61. 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
  62. 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
  63. 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
  64. 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
  65. 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
  66. 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
  67. 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
  68. 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
  69. 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
  70. 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
  71. Chemistry

    Can you show me how to do this? 2KClO3 -> 2KCl + 3O2 If 5.0(g) of KClO3 is decomposed , what volume of O2 is produced at STP? 5 g KClO3 = ?? mols. ??mols KClO3 will produce how many mols O2? Use the coefficients in the equation to do this conversion. 1 mol

    asked by Tabby on January 11, 2007
  72. Language Arts

    Read the following excerpt from "Saving Water." “Abandon the bathtub, and hit the showers. Sometimes it just feels great to soak in the tub, but the tub holds between nine and 33 gallons (40 to 50 liters) of water, depending on how full we fill it.”

    asked by Anonymous on February 28, 2013
  73. Edit plz!!!

    can u edit this plz!!!:D --> In order to gain knowledge and prove your statement/point, you will have to do research. Research can be described in many ways such as through friends/family, and through experience and observation. To research , you must

    asked by Thara* on January 30, 2010
  74. English*

    can u edit this plz!!!:D --> In order to gain knowledge and prove your statement/point, you will have to do research. Research can be described in many ways such as through friends/family, and through experience and observation. To research , you must

    asked by Thara* on January 30, 2010
  75. chemistry

    why is there no pop of pure oxygen and pure hydrogen?

    asked by alex on January 24, 2016
  76. chemistry

    How many grams of water can be formed from 10 grams of oxygen?

    asked by ashley on December 13, 2012
  77. astrophysics

    If the wavelength of Hydrogen is 21.10611405413 cm, what is the wavelength of oxygen in cm?

    asked by james on March 5, 2011
  78. chemistry

    how many grams of nitrogen will react with 23 grams of oxygen

    asked by missy on February 22, 2013
  79. Chemistry

    How many moles of bromine are obtained from 6.75 moles of oxygen?

    asked by Melanie on March 16, 2010
  80. science chemistry

    How many moles of oxygen atoms are there in 2 moles of CuSO4?

    asked by John on February 8, 2009
  81. 7th grade science

    what 6 things do living things need. Such as water and oxygen and...

    asked by Drummond on September 19, 2008
  82. science

    How many moles of water are produced when 5.00 moles of oxygen are used?

    asked by holli on May 8, 2008
  83. Chemistry

    How many moles of oxygen are produced when 20 moles decomposed?

    asked by Majiri on September 16, 2017
  84. Science

    how many gram of oxygen in persent in 36 gram of water?

    asked by Deepak on July 20, 2011
  85. chemistry

    The level of water in an Olympic size swimming pool (50.0 meters long, 25.0 meters wide, and about 2 meters deep) needs to be lowered 5.0 cm. If the water is pumped out at a rate of 4.7 liters per second, how long will it take to lower the water level 5.0

    asked by jode on May 15, 2014
  86. physical chemistry

    2 liters of N2 at 0 degree Celsius and 5 atm pressure are expanded isothermally against a constant pressure of 1 atm until the pressure of the gas is also 1 atm. Assuming the gas to be ideal, what are the values of work,delta E, delta H, and q for the

    asked by lyn on September 30, 2012
  87. chemistry

    The level of water in an Olympic size swimming pool (50.0 meters long, 25.0 meters wide, and about 2 meters deep) needs to be lowered 3.2 cm. If the water is pumped out at a rate of 5.0 liters per second, how long will it take to lower the water level 3.2

    asked by Grayson on January 16, 2015
  88. Composite Materials

    Can someone please help with this problem? A burnout test was performed to determine the volume fractions of constituents in a glass/epoxy composite. The following observations were made: Weight of empty crucible = 47.6504 g Weight of the crucible and

    asked by Jim on February 27, 2009
  89. accounting

    On December 31, 2008, University Theatres issued $500,000 face value of bonds. The stated rate is 6 percent, and interest is paid semiannually on June 30 and December 31. The bonds mature in 10 years. Required: If required, round your answers to the

    asked by me on July 20, 2011
  90. English

    Can you help me check this paragraph? Thank you for your last corrections! 1) It was midnight. We were walking through the street. There wasn’t anybody, everything was quiet, when a fast car jumped out of the darkness. 2)The car crashed against a wall

    asked by Franco on January 23, 2010
  91. Bio

    without oxygen cellular respiration grinds to a standstill although glycolysis can continue to make some atp anaerobically for a short time explain why the oxidative phosphorylation stops why does the citric acid cycle stop

    asked by Edwin on November 26, 2016
  92. chemistry

    Draw one of the Lewis structure of the N2O5. In each case one oxygen bridges the nitrogens (N-O-N single bond) and 2 other oxygens are bonded to each N. How many equivalent resonance structures are there that satisfy the octet rule and where O makes at

    asked by K on November 6, 2014
  93. Chemistry

    Hi , I have this question and I do not know what steps to follow. Please help guide me. It will be really appreciated. Calculate the extent of oxidation in a stream where water it's in equilibrium with atmospheric oxygen and had a pH pic 6.5 (a(H3O+)

    asked by Sarah on December 10, 2016
  94. chemistry

    Draw one of the Lewis structure of the N2O5. In each case one oxygen bridges the nitrogens (N-O-N single bond) and 2 other oxygens are bonded to each N. How many equivalent resonance structures are there that satisfy the octet rule and where O makes at

    asked by john on November 5, 2014
  95. chem

    2) How many moles of nitrogen monoxide will be produced when 80.0 grams of oxygen are used? What volume of ammonia is needed? this iz the equation 4NH3 + 5O2 -> 6H2O + 4NO the 1st part i got 4 mol NO and i don't no how to do the 2nd prt

    asked by gabriella on January 26, 2009
  96. Chem

    A synthesis reaction occurs between 15.0g of gallium and 15.0g oxygen. 1- Write a balanced equation. Ga + 02 --> Gao2 (I got this part) 2- Setup two factor labels to determine the mass of product possible considering each reactant. Please help #2. I don't

    asked by yengiang on February 4, 2013
  97. Chemistry

    Can you help me calculate the maximum weight-percent of H present in liquid iron containing 0.16 wt% Oxygen and equilibrated with H2O(g) at a pressure of 0.164 atm at 1600°C. Given ÄG° = -207653 + 0.292T J and assume that O and H both obey Henry’s

    asked by Brian James on April 10, 2015
  98. Chemistry

    I don't get how to fill in the blanks Show the products for cellular respiration by completing the following chemical reaction equation. Give the correct formula for oxygen as well Glucose+_________ ---> ________+______+___________

    asked by Steve on May 16, 2007
  99. Chemistry

    I havent been at school for 8 days due to somthing wrong with my heart, but the teachers gave me work. I have no clue how to do them. I really need help please, There all due tomarrow. Ammonia is formed by reacting nitrogen and hydrogen gases. How many

    asked by Help please on April 6, 2010
  100. chem

    (b) (4 pts.) 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

    asked by Anonymous on March 23, 2013