1. chemistry

    Consider 15 mL of an aqueous solution containing 2.0 g of an organic solute. If the distribution coefficient for the solute between ether and water is 20, calculate the percent of the compound that can be recovered with a single extraction with 13.9 mL of
  2. english

    16. Which of the following is a compound sentence? A. Rain and heavy winds caused damage along the coast. [B. Sue gave Jim a new racket, and he left for the tennis courts.] C. We found our way home without a map. D. Kim will take her daughter shopping when
  3. ENGLISH - COMPOUND SENTENCES? HELP!

    Can anyone tell me which of the following sentences is a compound sentence? A. Charlie said it’s cold outside but hot in his bedroom. B. Jared enjoys eating eggs and bacon for breakfast. C. Sierra can’t decide between the blue and the black shoes. D.
  4. English

    Which of the following is a compound sentence? a. Kim will take her daughter, shopping when she learn to behave in public. b. Sue gave Jim a new racket, and he left for the tennis courts. c. Rain and heavy winds caused damage along the coast. d. We found
  5. chemistry

    N2 + O2 --> 2 NO change in heat (delta H)= 43.2 kcal based on the reaction, which statement is true? a) 43.2 kcal are consumed when 1.00g of O2 reacts b) 43.2 kcal are consumed when 1.00g of N2 reacts c) 43.2 kcal are consumed when 1.00g of NO is produced
  6. Chemistry please help

    Elemental mercury was first discovered when a mercury oxide was decomposed with heat, forming mercury metal and oxygen gas. When a 0.204-g sample of the mercury oxide is heated, 0.189 g of mercury metal remains. a)what is mole ratio of mercury to oxygen in
  7. TLC purity

    Question: A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which the Rf value is 0.95, is observed. Does this indicate that the unknown material is a pure compound? What can be done to verify
  8. Chemistry(please help)

    I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the following equation. 2S2O3^2- + I2 -> 2I^- + S4O6^2- So I got 6.6e-3 L*min for the amount of I2 produced. Now I have to calculate
  9. Chem

    First off, thanks for the help on the other problems... For the reaction, A(g) + 2 B(g) 2 C(g), Kc = 1 x 10-10 at 25°C. Which of the following statements is true? 1. Delta n = +1 2. The concentration of the products is greater than the concentration of
  10. chemistry

    Which factors below affect the rate of a chemical reaction? -Collision frequency -Number of collisions having the least activation energy -Intermolecular orientation -Being Exothermic or Endothermic Also, what formula would I use for this problem: "What is
  11. psychology

    For each of the following questions, choose either authority, rational method or empirical method as the best way to answer the question, and explain how you would do it. Then consider whether any alternative methods might be used. is your course
  12. chemistry

    A 40-year old man, at a prominent legal firm experiences abdominal pain post lunch. He takes several trips to the restroom, but continues to experience pain and cramps. He decides to go to the doctor and admits he consumed 2 bottles of beer @ lunch. The
  13. Chem

    I have a few questions, if anyone can help me at all it would be amazing. i need this done by TOMORROW (03/03/2008) 1. Cyanogen has been observed in the atmopshere of Titan, Saturn's largest Moon, and in the gases of the interstellular nebulas. On Earth,
  14. Chemistry

    I have a few questions, if anyone can help me at all it would be amazing. i need this done by TOMORROW (03/03/2008) 1. Cyanogen has been observed in the atmopshere of Titan, Saturn's largest Moon, and in the gases of the interstellular nebulas. On Earth,
  15. Chemistry

    For the following reaction, 9.91 grams of sulfur are allowed to react with 20.8 grams of carbon monoxide . sulfur(s) + carbon monoxide(g) sulfur dioxide(g) + carbon(s) is the maximum amount of sulfur dioxide that can be formed? What is the FORMULA for the
  16. Chmistry

    For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be formed? grams What is the
  17. Chemistry

    A protein found in some types of wood-rotting fungi is 0.40% copper by mass. Each protein molecule is known to contain 4 copper atoms. What is the approximate molecular weight of thos compound?
  18. chemistry

    In the extraction of an organic compound from a dilute aqueous solution, will the organic solvent form the uppoer or lower layer when each of the following solvent is used? a. chloroform b. cyclohexane c. heptane d. dichloromethane
  19. Chemistry

    When 0.855 g of this solid was dissolved in 7.50 g of napthalene, the solution had a freezing point of 78.0° C. The pure solvent freezes at 80.0° C; its molal freezing point constant is 6.8° C/m. What is the molecular formula of the compound?
  20. E.L.A. PLEASE CHECK!

    Which choice best describes the underlined words in this sentence? On the next cloudless night, go outdoors and look at the sky. Underlined is: go ______ look A- simple predicate B- complete predicate C- compound verb D- none of the above I think it is C.
  21. Algebra

    Please Help. How long, to the nearest tenth of a year, will it take $12,500 to grow to $20,000 at 6.5% annual interest compounded quartely? (Use the formula for compound interest with n compoundings per year to solve for t.)
  22. math please explian

    I know how to do simple interest on a loan but how would I figure compound interest on a loan $8,000 invested for one year at 6% compounded quarterly ? with rounded to the nearest dollar thanks in advance for explaining :)
  23. Chemistry

    A protein found in some types of wood-rotting fungi is 0.40% copper by mass. Each protein molecule is known to contain 4 copper atoms. What is the approximate molecular weight of thos compound?
  24. science(chemistry)

    Using condensed electron configurations and Lewis electron-dot symbols to depict the monatomic ions formed from each of the following reactants, predict the formula of the compound the ions produce. 1) K and P
  25. Chem drawing

    how would I draw this compound? 2-bromo-6-chloro-4,4-dimethylheptane I've tried it again and again but I can't seem to get the Cl on the 6th carbon while still having a 6 carbon chain of heptane I drew it so that it was CH3 CBr CH2 CCH3CH3 CH2 Cl I just
  26. Chemistry 2

    A saturated solution of a certain metal(II) chloride has a chloride ion concentration of 0.032M. The Ksp for this compound can be determined to be a) 2.6 X 10-7 b) 4.1 X 10-6 c) 1.6 X 10-5 d) 2.6 X 10-4 e) 1.6 X 10-2 I am unsure how to approach this
  27. chemistry

    Using the equations and enthalpy values provided, which mathematical expression can be used to determine the unknown enthalpy change of the decomposition of propane? 3 C + 3 O2 3 CO2 H =-1182 kJ 4 H2 + 2 O2 4 H2O H = -1144 kJ C3H8 + 5 O2 3 CO2 + 4 H2O H =
  28. Chemistry

    A 40-year-old manager, at a prominent legal firm in L.A., experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps. He eventually decides to get himself examined. While questioning him,
  29. chemistry 101

    Consider the following reaction. CaO (s) + CO2 (g) = CaCO3 (s) A chemist allows 14.4 g of CaO and 13.8 g of CO2 to react. When the reaction is finished, the chemist collects 19.4 g of CaCO3. Determine the limiting reactant, theoretical yield, and percent
  30. chemistry

    1.equillibrium constant only changes for change in temp? not for change in pressure etc. 2. rate of reaction can be measure by measuring how long it takes for products to form or how long it takes for reactants to be consumed? so is the rate of consumption
  31. geometry

    let p represent a true statement, while q and r represent false statements, find the truth value of the compound statement ~[(p^q)^r]
  32. chemistry

    you are given a sample mass of 250g compound that is 45% water. How many grams of water can be recovered from the sample by dehydration?
  33. algebra

    If $8,500 is deposited in a compound interest account paying 3.9% interest annually, how much will be in the account after 12 years?
  34. Chemistry

    Compare and contrast two elements combining to form a compound and two compounds combining to form a mixture.
  35. Chemistry

    Identify the following as a complex ion or coordination compound: 1) [Co(NH3)3Cl3] 2) [Co(NH3)3Cl2]Cl 3) [Ni(NH3)4]^2+ 4) [Cu(NH3)4]^2+
  36. algebra 2

    If $8,500 is deposited in a compound interest account paying 3.9% interest annually, how much will be in the account after 12 years?
  37. Chemistry

    For the compound Ge[S(CH2)4 CH3)]4 determine: a.) the ratio, by number, of C atoms to H atoms b.) the ratio, by mass, of Ge S THANKS!
  38. geometry

    Let p represent a true statement, while q and r represent false statements. Find the truth value of the compound statement. ~[(~q V p)^ ~r]
  39. Math-geometry

    Let p represent a true statement, while q and r represent false statements. Find the truth value of the compound statement. ~[(~p ^ q) ^ r]
  40. Chemistry

    Do impurities raise or lower the property of an organic compound such as lower or raise an equivalent weight?
  41. maths

    The difference of compound interest and simple interest on an amount at the rate of 12% per annum for 2 years is Rs. 90/- then the amount will be -
  42. Chemistry

    Calculate the osmolarity of a 2.0 × 10-3 M Na3PO4 solution. Na3PO4 is an ionic compound and produces an electrolytic solution.
  43. Geometry

    Let p represent a true statement, while q and r represent false statements. Find the truth value of the compound statement. ~[(~q V p)^ ~r] this is the ?
  44. Maths

    The difference between the compound interest and simple interest on a certain sum for 2 years at 6 % per annum is rs. 90. Find the sum.
  45. Chemistry

    What kind of compound is table salt and how does it dissolve in water? Would salt dissolve in vegetable oil? Why or Why not?
  46. Chemistry and I think some physics

    Check my answers! This site needs a preview post option! And thanks for checking! 1. Classify each of the following pure substances as an element or a compound. A) carbon B) baking soda C) nickel D) gold My answers: A) element B) compound C) element D)
  47. physics

    A car is traveling at a constant velocity of 21 m/s (about 45 mph). The driver sees a fallen tree lying across the road and hits the brakes after a delay (reaction time) of 245 ms. (1 ms = 10-3 s.) Calculate the distance the car travels during this 245 ms
  48. Chemistry

    Does sodium metal react with potassium hydroxide solution? No. It would be a displacement reaction and this only works if the metal is higher in the activity series than the one it wants to displace. Given that potassium is the highest ranked metal (sodium
  49. Math

    Find the amount of compound interest earned in an account that opens with $27,000, earns 5.8% interest compounded daily, and is held for 5 years. Assume 360 days in a year. (Round your answer to the nearest cent.)
  50. math

    Find the amount of compound interest earned in an account that opens with $21,000, earns 5.4% interest compounded daily, and is held for 15 years. Assume 360 days in a year. (Round your answer to the nearest cent.)
  51. Finance

    Find the amount of compound interest earned in an account that opens with $24,000, earns 7.8% interest compounded daily, and is held for 20 years. Assume 360 days in a year. (Round your answer to the nearest cent.)
  52. Math

    Meghan deposited $2,500in an account at a bank that pays 16% compounded quarterly. Use the compound interest table to find the interest earned on the investment after 2 years. a. $921.43 b. $204 c. $2,704 d. $3,421.43 **This is a sample question** (Please
  53. MATH

    Find the amount of compound interest earned in an account that opens with $21,000, earns 5.5% interest compounded daily, and is held for 20 years. Assume 360 days in a year. (Round your answer to the nearest cent.)
  54. Org. Chem SOS???

    Sorry for re-posting this question but I feel as if it hasn't been read or something. Otherwise does no one really know the answer? I am really going crazy over it and I have only 1 try left. Please What is the lowest energy alternative resonance structure
  55. Intermediate Accounting

    E6-10 Assume that Serena Williams desires to accumulate $1 million in 15 years using her market fund balance of $182,696. At what interest rate must Serena's investment compound annually? I came up with 12,179.733 per year; but know this is incorrect.
  56. Chemistry

    Last one I promise! Thankyou for bearing with me. This seems simple enough, but chemistry genuinely makes me feel retarded so I appreciate reassurance. How many molecules of CH4 are there in 48.2g of the compound? I'm assuming that I should just divide
  57. math

    Find the amount of compound interest earned in an account that opens with $23,000, earns 4.3% interest compounded daily, and is held for 10 years. Assume 360 days in a year. (Round your answer to the nearest cent.) $ 1
  58. ALGEBRA

    Find the amount of compound interest earned in an account that opens with $23,000, earns 3.9% interest compounded daily, and is held for 15 years. Assume 360 days in a year. (Round your answer to the nearest cent.)
  59. ALGEBRA

    Find the amount of compound interest earned in an account that opens with $29,000, earns 7.5% interest compounded daily, and is held for 5 years. Assume 360 days in a year. (Round your answer to the nearest cent.)
  60. Chemistry

    two hydrates were weighed, heated to drive off waters of hydration, and then cooled. The residues were then rewieghed. Based on the follwing results, what are the formulas of the gydrates? Compound. Initial mass. M after cooling NiSO4*xH2O 2.08 1.22
  61. kkkkk

    Find the amount of compound interest earned in an account that opens with $27,000, earns 4.6% interest compounded daily, and is held for 15 years. Assume 360 days in a year. (Round your answer to the nearest cent.
  62. Chemistry

    The water from a hydrated magnesium salt is driven off by heat in a closed system. If the steam generated exerts a pressure of 24.8 atm in a 2L container 120 degrees C, determine the number of moles of H2O driven from the compound.
  63. algebra with application

    Find the amount of compound interest earned in an account that opens with $29,000, earns 2.8% interest compounded daily, and is held for 10 years. Assume 360 days in a year. (Round your answer to the nearest cent.)
  64. algebra/math

    Find the amount of compound interest earned in an account that opens with $24,000, earns 3.5% interest compounded daily, and is held for 10 years. Assume 360 days in a year. (Round your answer to the nearest cent.) $
  65. Chemistry: check answers

    Please check. Thank you. 2. What is the reduction half-reaction for the following unbalanced redox equation? Cr2O72– + NH4+ Cr2O3 + N2 A.) Cr2O3 -> Cr2O72– B.) Cr2O72– -> Cr2O3 C.) NH4+ -> N2 D.) N2 -> NH4+ 3. Which oxidation-reduction reactions are
  66. Chemistry

    Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure,
  67. Chemistry

    Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure,
  68. AP Chemistry

    The reaction of the molecules to produce ethane is C2H4(g) + H2(g) → C2H6(g). A mechanism for this reaction is shown below: (The figures show how the ethene molecule with two hydrogen molecules attached 'binds' to
  69. physics

    Part 1 A motorist traveling at 17 m/s encounters a deer in the road 48 m ahead. If the maximum acceleration the vehicle’s brakes are capable of is −5 m/s^2, what is the maximum reaction time of the motorist that will allow her or him to avoid hitting
  70. Chemistry

    Hi, I have another question... I need to write a reaction for the preparation of americium by reducing AmF3 with barium vapor at 1100C I'v looked and can't find anything that will help me with this... (I'm preparing for finals, so this might not be my last
  71. Chemistry

    Thanks to Dr. Bob for answering all these questions! I always do poorly on conceptual problems. Consider the following equilibrium system at 25°C and select the true statement below: H2PO4−(aq) + SO42−(aq) ↔ HSO4−(aq) + HPO42−(aq) ΔG°rxn > 0
  72. Chemistry

    The following reaction has a standard enthalpy of reaction of -146.0 kJ/mol: Cu2O(s) + 1/2 O2(g) -> 2CuO(s) The standard enthalpy of formation of Cu2O(s) is -168.6 kJ/mol. What is the standard enthalpy of formation of CuO(s)?
  73. chemistry

    Zinc reacts with sulphur to form zinc sulphuric 16.2g.Sample of zinc is reacted with log of sulphur(Zn=65,S=32,o=16) A)Write a chemical reaction for the reaction b)Calculate the number of moles of zinc atoms that reacted. c)Number of moles of sulphur atoms
  74. enviromental

    Completely mixed flow ractor CSTR and plug flow reactor (PFR) may have significantly different efficiencies depending on the reaction order. This problem asks you to compare the relative reactor sizes required to ensure 99.0 % removal of wastewatwer
  75. chemistry

    you are given samples of two pure compounds, one of which is a gas and one of which is a liquid at room temperature. by elemental analysis, both compounds are found to have the following composition (by mass): 52% C 13% H 35% O (a) Determine the empirical
  76. CHEM

    How do I work the following question? I found the amu of CaCO3=101.0872g/mol; 2HCL=72.92128g/mol; H2O=18.1582g/mol;CO2=44.0098g/mol; and, CaCl2=110.9834g/mol. You carefully weigh out 10.00g of powder and add it to 40.50g of solution. You notice bubbles as
  77. chemistry

    What is the solubility of AgCl when it is in a solution of 0.15 M NaCl? (AgCl has Ksp = 1.8 x 10-10.) Make a reaction table. Include rows for initial concentration, change in concentration, and equilibrium concentration. Write down the equation for the Ksp
  78. chemistry

    What is the solubility of AgCl when it is in a solution of 0.15 M NaCl? (AgCl has Ksp = 1.8 x 10-10.) Make a reaction table. Include rows for initial concentration, change in concentration, and equilibrium concentration. Write down the equation for the Ksp
  79. chemistry

    given this reaction N2O5 -> 2 N2O + 1/2 O2 all gases and given the initial pressure (P Initial) and total pressure (P total)at any time, relate the partial pressure of N2O5 (PP N2O5) to P total for any time during this reaction. Consider gas kinetics. My
  80. Chemistry

    If air is 20% oxygen, and the reaction is 2C2H2 + 5O2 --> 4CO2 + 2H2O, What volume of oxygen would be needed to completely burn 1.00 L of acetylene (C2H2)? I got 2.50 L but I'm not sure it's right. What volume of air would be needed to completely burn 1.00
  81. chemistry

    for the reaction to generate 2‐phosphoglycerate (2PG) from 3‐phosphoglycerate (3PG, ΔG = 0.83 kJ/mol; ΔGo’ = 4.4 kJ/mol. (R = 8.31 x 10‐3 kJ•K‐1•mol‐1) a)What is the ratio of 3PG:2PG in cells at 37C? I got 5.52 as answer for this part but
  82. Gen. Chemistry

    Compare the properties of elements and compounds. Give two examples of each, including one example that exists in the human body. Explain the atomic nature of one element and one compound found in human body.
  83. Chemistry

    A gas containing sulfur and fluorine analyzed as 29 % sulfur. A 140 g sample of a gas occupied a volume of 50.1 L with a pressure of 478.80 torr at 296.00 K. Enter the molecular formula of the compound.
  84. bussiness fianace.

    • You deposit $5,000 into a 3-year certificate of deposit account that pays an annual compound interest of 3.0%. When the CD period is up, you roll the entire balance over into another 3-year CD paying 3.5%. How much will you have at the end of 6 years?
  85. FInance

    Assume that you have $10,000 which you plan to invest for 3 years. How much more would you have if you invested the funds at 10% with annual compound interest versus 10% with simple interest? No funds will be paid until the end of the 3rd year.
  86. chemistry

    Solid NaI is slowly added to a soln that is 0.010M in Cu+ and 0.010M in Ag+. a. Which compound will begin to precipitate first? b. Calculate [Ag+] when CuI just begins to precipitate/ c. What percent of Ag+ remains in solution at this point?
  87. English

    Identify the part of speech for the CAPITALIZED phrase. The novel Huck Finn is set along the banks of the MISSISSIPPI RIVER. a. proper noun*** b. common noun c. collective noun d. compound noun
  88. Chemistry

    A gas containing sulfur and fluorine analyzed as 29 % sulfur. A 140 g sample of a gas occupied a volume of 50.1 L with a pressure of 478.80 torr at 296.00 K. Enter the molecular formula of the compound.
  89. chemistry

    The organic compound di-n-phthalate is sometimes used as a low-density manometer fluid. Compute the pressure (in torr) of a gas that supports a 517-mm columns di-n-butyl phthalate . The density of mercury is 13.53 g mL-1.
  90. english

    • I couldn’t decide which of the two sweaters to buy. • The saleswoman convinced me to take both. • At home, I regretted the expensive purchase. • I vowed to return one of the sweaters. (combine the above four sentence using complex compound
  91. chem

    A molecular compound is composed of 58.8% Xe, 7.2% O, and 34.0% F, by mass. If the molecular weight is 223 g/mol, what is the molecular formula? Draw the correct Lewis structure. Predict the molecular geometry using the VSEPR model.
  92. English

    Which simple sentence has a compound verb? A. Becky and I weren't sure. B. Anne wanted a surprise party for Carrie. C. We have been planning the party since April. D. Finally, we voted and decided against a surprise.
  93. Chemistry

    Compare the properties of elements and compounds. Give two examples of each, including one example that exists in the human body. Explain the atomic nature of one element and one compound found in human body.
  94. math

    find the average return over the last ten years on a mutual fund . what investment account of 1,000 for 5,10,15,20,25,30,35 and 40 years compound quaretly. is there a point at which the investment appears to grow more quickly
  95. math

    compounded- what would be the amount of compound interest on $12,000 invested for one year at 6%, compounded quarterly? round your answer to the nearest tenth. could you show me the work please ? i had $737.00 is that answer correct?
  96. Chemistry

    How many grams of glycerin C3H8O3 must be dissolved in 375.9g of water at 100 degrees Celsius to reduce the pressure of water above the solution to 714.6mmHg. The solution is a non-volatile compound
  97. chemistry

    The pH of 100 mL of a 0.10 M aqueous solution of Compound Z is 11.30. (a) Is Z an acid, a base, neither, or cannot be determined? Justify your choice. (b) Write the relevant Bronsted-Lowry equation showing how Z behaves in aqueous solution
  98. chemistry

    On complete oxidation, one mole of an organic compound produced four moles of water. Which one of the following substances could it be? CH4 C2H6 C3H7OH C4H10 So I added O2 to each of these compounds, but I must be doing something wrong because I can't get
  99. Chemistry

    If 2.00 mL of 0.600 M NaOH are added to 1.000 L of 0.850 M CaCl2, what is the value of the reaction quotient and will precipitation occur? I've been trying this problem over and over and haven't been able to get it. I know precipitation will not occur from
  100. chem

    For the following reaction, 31.1 grams of diphosphorus pentoxide are allowed to react with with 10.2 grams of water. diphosphorus pentoxide (s) + water (l)>>> phosphoric acid (aq) What is the maximum amount of phosphoric acid that can be formed in grams?