Monique

Most popular questions and responses by Monique
  1. bio

    The cell membrane is a highly selective barrier that controls the movement of substances in and out of the cell. In fact, polar molecules are unable to go across unless A. they are enclosed in water-filled vesicles. B. they pass through channels in the

    asked on March 21, 2012
  2. Stoichiometry

    Find the limiting reactant for the initial quantities of reactants 2k(s) + Cl2(g)--> 2KCl(s) 1.8 mol K; 1 mol Cl2 I'm lost

    asked on October 4, 2011
  3. Stoichiometry

    Consider the reaction between reactants S & O2 2S(s) + 3 O2(g) ==> 2 SO3(g) If a reactant vessel initially contains 5 mol S and 9 mol O2, how many moles of S, O2 and SO3 will be in the reaction vessel once the reactants have reached as much as possible?

    asked on October 4, 2011
  4. Chemistry Please Help

    Iron is found in Earths crust as several different iron compounds. Calculate the mass (in kg) of each compound that contains 1.0 x 10E3 kg of iron. Fe2O3 Please help step by step

    asked on September 25, 2011
  5. chemistry

    an 8.5g ice cube is placed into 255g of water. Calculate the temp change in the water upon the complete melting of the ice. Hint: Determine how much heat is absorbed by the melting ice and then use q = mc^T to calculate the temp change of the 255g of water

    asked on October 23, 2011
  6. Stoichiometry

    For each precipitation reaction, calculate how many grams of the first reactant are necessary to completely react with 17.3 g of the second reactant. 2KI(aq) + Pb(NO3)2(aq)--->PbI2(s) + 2KNO3(aq) Not looking for the answer I really want to know if I did it

    asked on October 4, 2011
  7. chemistry

    a 3.5L sample of a 5.8M NaCl solution is diluted to 55L.What is the molarity of the diluted solution

    asked on November 6, 2011
  8. Statistics #3

    The estimate of the population proportion is to be within plus or minus .10, with a 99 percent level of confidence. The best estimate of the population proportion is .45. How large a sample is required?

    asked on June 11, 2008
  9. Stoichiometry

    So I have this question it reads Consider the generic chemical reaction How many moles of B are required to completely react with 2A + 3B ==> 3C 1. 6 mol of A 2. 2 mol of A I won't put them all just guide me in the right direction please

    asked on October 5, 2011
  10. Chemistry

    For the reaction Ag2S 2Ag + S2 what happens to the equilibrium position if aqueous ammonium sulfide is added A. Shift left B. Shifts right C. Does nothing D. Doubles E. Halves

    asked on November 11, 2011
  11. corrected repost chemistry

    to what volume should you dilute 125mL of an 8.00M CuCl2 solution so that 50.0mL of the diluted solution contains 5.9g CuCl2 I have a hard time determing the M1V1=M2V2 is

    asked on November 6, 2011
  12. chemistry

    If im given mass percent and mass solvent how do I find mass solute and mass solution. example: Mass percent = 3.8% and Mass solvent 45.8 g. Find mass solute and mass solution

    asked on November 2, 2011
  13. chemistry

    A 45.8mL sample of 5.8M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0 g of KNO3.

    asked on November 6, 2011
  14. chemistry

    Balance the redox reactin in basic. ClO- + Cr(OH)4- --> CrO42- + Cl- H2O + ClO- --> Cl- + 2OH ClO- has a +1 O# and Cl- has a -1 O# how do I balance that. And is what Ive done so far correct? Cr(OH)4- --> CrO42- Im confused on how to balance the oxygen and

    asked on November 25, 2011
  15. Chemistry

    How many moles of gold atoms do 3.45 x 10^24 gold atoms constitute. This is what I did 3.45 x 10^24 x 1 / 6.022 x 10^23 = 573 am I right

    asked on September 25, 2011
  16. chemistry

    Hydrochloric acid is usually purchased in concentrated form with a 37.0% HCL concentration by mass and a density of 1.20g/mL. How much of the concentrated stock solution in milliliters should you use to make 2.5L of 0.500M HCL

    asked on November 6, 2011
  17. chemistry

    Describe how you would make 500.0mL of a 0.200M NaOH solution from a 15.0 stock NaOH conentration

    asked on November 6, 2011
  18. Chemistry

    How many moles of gas must be forced into a 3.5 L ball to give it a gauge pressure of 9.4 psi at 25 degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.7 psi so that the total pressure in the ball is

    asked on October 18, 2011
  19. chemistry

    an aqueous solution containing 17.5g of an unknown molecular(nonelectrolyte) compound in 100.0g of water has a freezing point of 1.8 degress C. calculate the molar mass of the unknown compound

    asked on November 5, 2011
  20. Chemistry

    A snorkeler takes a syringe filled with 16 mL of air from the surface, where the pressure is 1.0 ATM, to an unknown depth. The volume of the air in the syringe at this depth is 7.5 mL. What Is the pressure at this depth? If the pressure increases by an

    asked on October 14, 2011
  21. Chemistry

    Write the Lewis structure for each ion Al3+ Mg3+ Se2- N3- My question is why does Se2- get a bracket and 8 dots. And the same for N3-. I hope I'm making sense.

    asked on September 11, 2011
  22. chemistry

    A radioactive sample contains 2.45g of an isotope wiht a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days? please explain

    asked on November 26, 2011
  23. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a

    asked on April 14, 2011
  24. chemistry

    A glucose solution contains 55.8g of glucose (C6H12O6) in 455g of water. Calculate the freezing poing and boiling point of the solution. (Assume a density of 1.00 g/ml for water. This what I did, I got moles of C6H12O6, 0.89 moles C6H12O6 then I got the

    asked on November 4, 2011
  25. chemistry

    a 10.0mL sample of an unknown H3PO4 solution requirs 112mL of 0.100 M KOH to completely react with the H3PO4. What was the concentrartion of the unknown H3PO4 solution? H3PO4 + 3KOH -----> 3H2O + K3PO4 Ive seen these problems with one volume but not two

    asked on November 3, 2011
  26. U.S History

    Which of these statements best describes President Jackson's views on nullification? President Jackson wanted to give the power of government back to the states. President Jackson did not believe a state could legally leave the Union. President Jackson

    asked on July 10, 2018
  27. Chemistry

    C4H10O(l) + O2(g) --- CO(g) + H2O(g) When I balanced it I got this C4H10O(I) + 4O2(g) --- 4CO(g) + 5H2O Am I correct

    asked on September 29, 2011
  28. Statistics

    A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students: Major Gender Accounting Management Finance Total Male 100 150 50 300 Female 100 50 50 200 Total 200

    asked on June 11, 2008
  29. chemistry

    Balance the following redox reaction occurring in acidic solution Cu(s) + NO3-(aq)--> Cu2+(aq) +NO2(g) This is what I have done so far Cu-->Cu2+ + 2e- 2H + NO-3 --> NO2 + H2O Need help please

    asked on November 20, 2011
  30. chemistry

    A wooden boat discovered just south of the Great Pyramid in Egypt had a carbon - 14 content of approximately 50% of that found in living organisms. How old is the boat?

    asked on November 26, 2011
  31. chemistry

    Potash is composed mainly of potassium carbonate, K2CO3. If 1.000g of potash reacts with sulfuric acid to produce 145 mL of carbon dioxide gas at STP, what is the percentage of potassium carbonate in the marble sample? K2CO3 + H2SO4 ==> K2SO4 + H2O + CO2

    asked on November 28, 2011
  32. chemistry

    A 13.03 g sample contains only ethylene glycol (C2H6O2) and propylene glycol (C3H8O2). When the sample is added to 100.0g of pure water, the resulting solution has a freezing point of -3.5C. What is the percent composition of ethylene glycol and propylene

    asked on November 6, 2011
  33. chemistry

    A KNO3 solution is made using 88.4g of KNO3 and diluting to a total soultion volume of 1.50l. Calculate the molarity and mass percent of the solution. Assume a density of 1.05 g/mL for the solution.

    asked on November 6, 2011
  34. Social Studies

    Which occur first? egypt and kush develop an interdependent trade relationship egypt conquers kush kush conquers egypt assyrians conquer kush in egypt kush and egypt continue to develop independently of each other

    asked on September 25, 2018
  35. algebra

    Suppose you have a can of paint that will cover 400 ft squared. A. find the radius of the largest circle you can paint. Round to the nearest tenth of a foot.( hint use the formula A=3.14 times radius squared B. Suppose you have two cans of paint, which

    asked on April 12, 2012
  36. Physics

    A child riding a bicycle has a total mass of 40kg. The child approaches the top of a hill that is 10m high and 100m long at 5m/s. If the force of friction between the bicycle and the hill is 20N, what is the child's velocity at the bottom of the hill?

    asked on November 15, 2009
  37. Chemistry

    A 50g sample of metal was heated to 100 degrees Celsius and then dropped into a beaker containing 50g of water at 25 degrees Celsius. If the specific heat of the metal is .25 cal/g degrees Celsius, what is the final temperature of the water? A. 27 B. 40 C.

    asked on July 23, 2011
  38. Chemistry

    A thief uses a bag of sand to replace a gold statue that sits on a weight sensitive alarmed pedestal. The bag of sand and the statue have exactly the same volume 1.75 L. Assume that the mass of the bag is negligible. A) calculate the mass. ( density of

    asked on October 9, 2011
  39. chemistry

    Balancing Redox Reaction in Basic Solution CN- + MnO-4 --> CNO- + MnO2 H2O + CN- --> CNO- + 2H +2e 3e + 4H + MnO4- --> MnO2 + 2H2O My confusion is with adding the OH- please explain

    asked on November 22, 2011
  40. Algebra1

    Population of Mexico has been increasing at annual rate of 1.7% if population was 100,350,000 in year 2000, predict population in 2015. Round to nearest number

    asked on February 27, 2017
  41. Chemistry

    Consider the chemical reaction C + H2O -----> CO + H2 How many liters of hydrogen gas are formed From the complete reaction of 1.07 mol of C? Assume that the hydrogen gas is collected at a pressure of 1.0 atm and the temperature of 315K So I'm looking for

    asked on October 19, 2011
  42. biology

    Organisms must be able to adapt to a changing external and internal environment. An organism's ability to maintain a stable internal environment is known as homeostasis. How does a cell's membrane help an organism maintain homeostasis? A. Cell membranes

    asked on March 21, 2012
  43. chemistry

    What is the concentration of the Mg2 ion in solution when [CO3-2] = 0.25M given that the Ksp= 6.82 x 10-6 for the following reaction MgCO3-------->Mg +. CO32- Chemistry - DrBob222, Friday, November 11, 2011 at 5:34pm Ksp = (Mg^2+)(CO3^2-) Substitute 0.25M

    asked on November 12, 2011
  44. Math

    A thin lead apron is used in dental offices to protect patients from harmful X rays. If the sheet measures 75.0 cm by 55.0 cm by 0.10 cm, and the density of lead is 11.3 g/ cm, what is the mass of the apron in grams?

    asked on August 30, 2011
  45. Geometry

    A 30-foot cable is suspended between the tops of two 20-foot poles on level ground. The lowest point of the cable is 5 feet above the ground. What is the distance between the two poles?

    asked on September 20, 2011
  46. Chemistry

    In this reaction, 4.58 L of O2 were formed at 745mm Hg and 308 K. How many grams of Ag2O decomposed. 2 Ag2O----> 4 Ag + O2 Please help I'm very confused

    asked on October 17, 2011
  47. Chemistry

    A 1.250 g sample of copper wire was heated in air and reacted with oxygen to give 1.565 g of copper oxide product. Calculate the empirical formula of the copper oxide. Please help I'm lost. I need step by step Please and thank you

    asked on September 21, 2011
  48. Chemisrry

    If the specific gravity of E85 gasohol is 0.801' what is the mass of 1.00 gallon of th E85 fuel. Given 1 gallon = 3.75 liters

    asked on August 30, 2011
  49. Math

    Ian gets $9 for each hour he works and $10for each day he works. To find out how much he makes in a day, he made the equation y=9x+10x, where x is the number of hours he works. Explain why Ian's equation will not tell him how much he makes in a day.

    asked on April 16, 2015
  50. Chemistry

    Convert a pressure of 23.8 in. Hg into kilopascal. Ok so I looked up kilopascal and it Said 1 Kpa = 1000 pa So I began to set it up like this 23.8 / 29.2 x1000 am I correct Chemistry - DrBob222, Thursday, October 13, 2011 at 1:48pm I don't think that will

    asked on October 13, 2011
  51. Stoichiometry

    Find the limiting reactant for the initial quantities of reactants 2k(s) + Cl2(g)--> 2KCl(s) 1.8 mol K; 1 mol Cl2 I'm lost

    asked on October 4, 2011
  52. Chemistry

    Caffeine a stimulant found in coffee has the mass composition of C, 49.48%, H, 5.19%, N, 28.85%, O 16.48%. The molar mass of caffeine is 194.19g/mol. Find the molecular formula for caffeine.

    asked on September 25, 2011
  53. chemistry

    use oxidation states to identify the element that is being oxidized and the element that is being reduced in the redox reaction Sn + 4HNO3 ---> SnO2 + 4NO2 + 2H2O I see that SN is oxidized 0 --> 4+ and book says N is reduced +5 --> +4 I don't see that.

    asked on November 18, 2011
  54. College physics

    The magnetic field at the center of a 0.70-cm-diameter loop is 2.4 mT. What is the current in the loop? A long straight wire carries the same current you found in part a. At what distance from the wire is the magnetic field 2.4 mT?

    asked on July 26, 2010
  55. Math

    Ricardo spends 8/9 hour reading the newspaper. He spends 1/4 of the time reading the world news and splits the remaining time equally between the sports news and the comics. How much time does he spend reading the comics?

    asked on March 23, 2015
  56. chemistry

    A rolaids tablet contains calcium carbonate which neutralizes stomach acid. If rolaids tablet neutralizes 42.15 mL of 0.320M hydrochloric acid, how many milligrams of calcium carbonate are in a Rolaids tablet CaCO3 + 2 HCl ------> CaCl2 + H2O + CO2 Pls

    asked on November 15, 2011
  57. Physics

    A construction worker attempts to lift a uniform beam off the floor and raise it to a vertical position. The beam is 2.50m long and weighs 500N. At a certain instant the worker holds the beam momentarily at rest with one end at distance d=1.50m above the

    asked on January 10, 2011
  58. chemistry

    a 25.0ml dsmplr og 0.105M HCI was titrated with 31.5ml of NaOH. What is the concentration of the NaOH I got 0.0834M am I correct HCI + NaOH -----> H20 + NaCl 25.0ml HCI x 1L/1000mlx0.105 mol HCI/1L HCI X 1 mol NaOH/ I mol HCI = 0.0834M

    asked on November 10, 2011
  59. Algebra

    maximize Z = 30x+50y subject to 2x+4y=100 and x+5y=80

    asked on January 7, 2011
  60. chemistry

    calculate the hydronium ion concentration in 0.125M formic acid, HCHO2 Ka= 1.8 x 10-4 can you show me the steps pls

    asked on November 11, 2011
  61. AP Chemistry

    An organic compound was synthesized and found to contain only C, H, N, O, and Cl. It was observed that when .150g sample of the compound was burned, it produced .138g of CO2 and .0566g of H2O. All the Nitrogen in a different .200g sample of the compound

    asked on September 15, 2009
  62. Chemistry

    Is it true that Na+ and K+ are always spectator ions in reactions that involve sodium and potassium compounds

    asked on September 30, 2011
  63. College physics

    Find the following potential differences. The magnitude of the potential difference DeltaV1 across the resistor of resistance R1 = 15.0 Ohm. The magnitude of the potential difference DeltaV2 across the resistor of resistance R2 = 45.0 Ohm. The magnitude of

    asked on July 17, 2010
  64. chemistry

    how do you figure out how to Balance H2SO4+pb(OH)4=pb(SO4)2=H20

    asked on December 7, 2009
  65. Chemistry

    Silver has a density of 10.5 g/cm3 and gold has a density of 19.3 g/cm3. Which would have a greater mass, 5 cm3 of silver or 5 cm3 of gold

    asked on September 1, 2011
  66. Social Studies

    Which of the following is a characteristic of a developed nation? A. Low income B.high poverty C.service based economy D.economy based manufacturing

    asked on October 18, 2018
  67. Maths

    Write. The following in standard. Form 6120

    asked on November 10, 2016
  68. Chemistry

    Calculate the pH buffer made by combing 50.0 mL of 1.00M ammonia and 50.0mL of ammonium nitrate. Can I use the same formula? If so do I do anything with the mL

    asked on November 11, 2011
  69. chemistry

    calculate the pH of a buffer solution containing 0.200M acetic acid, HC2H3O2, plus 0.150M sodium acetate. The dissociation constant for HC2H3O2 is 1.76 x 10-5 I don't think our instructor gave enough notes on these things Im kind of winging it from the

    asked on November 11, 2011
  70. Chemistry

    Identify the equation for which Keq= [Cu+]2[S2-]

    asked on November 11, 2011
  71. chemistry

    how much of a 1.50M solution sodium sulfate solution in milliliters is required to completely precipitate all the barium in 150.0mL of a 0.250 M barium nitrate solution

    asked on November 6, 2011
  72. Statistics

    The distribution of heights of adult males has a mean of 69 inches and a standard deviation of 4 inches. A random sample of 36 adult males is selected. Find the probability that the average height will be more than 70 inches. a.0.668 b.0.858 c.0.908

    asked on October 31, 2011
  73. Finance

    A three-year bond has 8.0% coupon rate and face value of $1000. If the yield to maturity on the bond is 10%, calculate the price of the bond assuming that the bond makes semi-annual coupon interest payments.

    asked on April 8, 2011
  74. Chemistry

    What is the concentration of the Mg2 ion in solution when [CO3-2] = 0.25M given that the Ksp= 6.82 x 10-6 for the following reaction MgCO3-------->Mg +. CO32-

    asked on November 11, 2011
  75. chemistry

    An ethylene glycol solution is mad using 58.5g of (C2H6O2) and diluting to a total volume of 500.0 mL. Calculate the freezing and boiling point. Assume a density of 1.09 g/ml for the solution

    asked on November 5, 2011
  76. Chemistry

    A chemical reaction occurring in a cylinder equipped with a movable piston produces 0.58 mol of a gaseous product. If the cylinder contained 0.11 mol of gas before the reaction and had an initial volume of 2.1 L, what was it's volume after the reaction. Am

    asked on October 14, 2011
  77. Math Statistical #2

    Research at the University of Toledo indicates that 50 percent of the students change their major area of study after their first year in a program. A random sample of 100 students in the College of Business revealed that 48 had changed their major area of

    asked on June 11, 2008
  78. chemistry

    Am I headed in the right direction. Sn + MnO4- --> Sn2+ + Mn2+ Sn --> Sn2+ + 2e- 5e + 8H + MnO4- --> Mn2+ + 4H2O If Im right what is the whole number that Im multiplying by

    asked on November 20, 2011
  79. Chemistry

    How many CO2 molecules can be made with 0.500 mol of oxygen atoms?

    asked on September 29, 2011
  80. math

    A company made 4 million in the second quarter this is 1/3 more than it made in the first quarter and 4/5 of what it made in the third quarter how much did the company make in the three quarters combined

    asked on November 30, 2015
  81. chemistry

    I need help calculating [H3O] from pH and the pOH scale using my calculator. I have a TI-30XIIS

    asked on November 11, 2011
  82. Chemistry

    Calculate the mass (in kg) of each compound that contains 1.0 x 10E3 kg of iron. Fe2O3 I really can't figure this one out please help step by step

    asked on September 25, 2011
  83. math

    Actually calculate the final amount on $1000 compounded annually at 6% per year for 4 years.

    asked on December 28, 2008
  84. Physics

    A mass of .24 kg is attached to a spring and is set into vibration with a period of .30 s. What is the spring constant of the spring? Answer in units of N/m

    asked on February 16, 2012
  85. Geometry

    Angle A and Angle B are complementary andgles and the m Angle A = 58 degrees, what is he measure of the supplement of Angle B. This is what I did Angle A and Angle B = 90 degrees, mAngle A = 58 degrees 90 - 58 = 32 degrees 180 - 32 = 148 M angle B

    asked on February 6, 2012
  86. chemistry

    Silver is electroplated at the cathode of an electrolysis cell by the half reaction Ag+(aq) + e- --> Ag(s) How many moles of electrons are required to electroplate 5.8g of Ag?

    asked on November 25, 2011
  87. Chemistry

    A mixture containing 235 mg of Helium and 325 mg of neon has a total pressure of 453 torr. What is the partial pressure of Helium

    asked on October 20, 2011
  88. Stoichiometry

    Consider the reaction between reactants S & O2 2S(s) + 3 O2(g) ==> 2 SO3(g) If a reactant vessel initially contains 5 mol S and 9 mol O2, how many moles of S, O2 and SO3 will be in the reaction vessel once the reactants have reached as much as possible?

    asked on October 5, 2011
  89. Chemistry

    Calculate the empirical formula for the compound 1.245g Ni, 5.381g I Can you help with the steps please

    asked on September 25, 2011
  90. Geography

    [THESE QUESTIONS ARE NOT THE SAME AS MY PREVIOUS POST) I am working on my take home quiz questions now...and i am not sure about the answers of the folowing questions...can anyone please help me to check???? THANKS A LOT!!!! (The "*" represents the answer

    asked on July 7, 2010
  91. Algebra II

    Find the difference quotient for the following Rational Function f(x)=5/x using the four steps outlined below. a. find f(x+h) b. find f(x) c. substitute f(x+h) and f(x) into the difference quotient formula. d. simplify

    asked on June 23, 2014
  92. chemistry

    Please explain this to me 2I- --> I2 + 2e Cr2O72- ==> Cr3+ 6e + 14H + Cr2O72- ==> 2Cr3+ + 7H20 I don't understand how the left side gets 6 electrons.

    asked on November 20, 2011
  93. Physics

    Three identical stars of mass M form an equilateral triangle that rotates around the triangle's center as the stars move in a common circle about that center. The triangle has edge length L. What is the speed of the stars?

    asked on January 11, 2011
  94. Chemestry

    When you were dissolving salt or sugar in a beaker of water, how did you know it was a saturated solution?

    asked on February 10, 2016
  95. history

    how did the use of bronze give shang warriros on advantage over enemies who did not use bronze?

    asked on April 16, 2015
  96. algebra

    An investor invested a total of $2200 in two mutual funds. One earned 5% profit while the other earned a 3% profit. If the investor's total profit was $86, how much was invested in each mutual fund?

    asked on April 5, 2013
  97. chemistry

    calculate the amunt of heat required to completely boil 250g of water starting from room temp 22 degrees C

    asked on December 6, 2011
  98. chemistry

    please help this equation is driving my crazy. balance the following redox reaction in basic solution. H2O2 + ClO2 --> ClO-2 + O2

    asked on November 23, 2011
  99. chemistry

    Fe2+ + MnO-4 --> Fe3+ + Mn2+ Fe2+ = +2 Mn = +7 O-4 = 4(-2) = -8 Fe3+ = 3+ Mn2+ = 2+ ok so next I gave 8H to MnO-4 and 4 H20 to Mn2+ Next I starting adding my electrons. 1e- to Fe3+. I understand that. This is where Im lost according to my book I give 5e-

    asked on November 18, 2011
  100. Geography

    I am working on my take home quiz questions now...and i am not sure about the answers of the folowing questions...can anyone please help me to check???? THANKS A LOT!!!! (The "*" represents the answer I chose) In the United States, early warning systems

    asked on July 7, 2010

Pages

  1. 1
  2. 2
  3. 3