chemistry! URGENT

61,546 results, page 92

  1. chemistry

    What are the two things that determine whether a molecule is polar or nonpolar?
  2. chemistry

    which of the following is not Acidic? Milk Saliva soft drinks blood
  3. chemistry

    A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?
  4. chemistry

    A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?
  5. chemistry

    A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?
  6. chemistry

    Determine the delta H for the following reaction C3H4(g) + 2H2(g) --> C3H8(g)
  7. chemistry

    Could you produce a cell that contains a 1.0M solution of Fe2+ and Fe3+ ions?
  8. chemistry

    what is the numerical value of the equilibrium constant Kgoal for the reaction CO2(g) C(s) +O2(g)
  9. chemistry

    How much water do you need to add to 10 mL of a solution of HCl with a pH of 3 to change the pH to 6?
  10. Chemistry

    How many milliliters of 3.0 M NaOH are required to react with 0.50g of Cu2+ to form Cu(OH)2?
  11. Chemistry

    When NiCl2.6H2O dissolves in water, what does it form (i.e. balanced equation)?
  12. chemistry

    What mass of sodium iodide (NaI) is contained in 135 mL of a 7.0% (m/v) soulution?
  13. chemistry

    Calculate the volume needed to dissolve 11.2g CuSO4 to prepare 0.140M?
  14. chemistry

    What is the pH of a solution made by dissolving the 37 g of KOH in 500 mL of water, with no buffer in it?
  15. chemistry

    How many grams of sodium chloride are needed to prepare 250 mL of a 2% solution?
  16. chemistry

    how many grams of manganese (4) oxide are needed to make 5.6 liters of a 2.1 solution
  17. Chemistry

    55g of CF2Cl2, how many grams of Cl do I have? How do I solve this kind of problem?
  18. chemistry

    Explain how strong acid solutions conduct an electric current.
  19. chemistry

    how many grams of calcium nitrate are needed to make 100mL of a 0.5M solution
  20. chemistry

    what is the molarity if 0.5 grams of sodium chloride is dissolved to make 0.05 mL of solution?
  21. chemistry

    Calculate the pH of a solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M benzoic acid (Ka = 6.5 x 10 -5
  22. chemistry

    If a car produces 88g of CO2, how many grams of O2 are used up in the reaction?
  23. Chemistry

    Describe the dynamic equilibrium that exists in the two water tanks?
  24. Chemistry

    How many grams of lithium will combine with 29.1 g of sulfur to form the compound Li2S?
  25. chemistry

    Why would you find ethanol or water during an aspirin lab?
  26. chemistry

    Why would you find ethanol or water during an aspirin lab?
  27. chemistry

    write balanced equation of the reaction of bromine and sodium thiosulfate
  28. chemistry

    what is the net ionic equation, including phases, for the reaction of AgNO3 with Ba(OH)2
  29. chemistry

    what is the molar solubility of barium fluoride in 0.15M NaF at 25 degrees C?
  30. Chemistry

    How many moles of oxygen atoms are contained in 1.86 x 10-2 mol CuSO4·5H2O
  31. AP Chemistry

    what is the pH of a solution that is 0.060 M in potassium propionate and 0.085 M in propioic acid
  32. chemistry

    How do I calculate 50ml of a 50mM sodium momophosphate buffer solution
  33. Chemistry

    How much sodium carbonate is needed to precipitate nickel sulfate
  34. chemistry

    how do you calculate the mass of water that will be produced when 5.0 grams of H2 is reacted with excess O2?
  35. Chemistry

    You mix 1.00 L of 2.00 M BaCl2 with 1.00 L of 2.00 M AgNO3. What compounds remain in solution, and what are their concentrations?
  36. Chemistry

    If 25.5 grams of NaOH is dissolved in 750 ml of water, find: [H+]= [OH-]= pH= pOH=
  37. chemistry

    How would you make 250 ml of a .51M calcium hydroxide solution?
  38. chemistry

    How would you make 250 ml of a .51M calcium hydroxide solution?
  39. chemistry

    Find Molecular and net ionic equation for Al(NO3)3 + Na2CO3
  40. chemistry

    Find Molecular and net ionic equation for Al(NO3)3 + Na2CO3
  41. chemistry

    How many grams of magnesium iodide are needed to make 125 ml of a 5M solution
  42. Chemistry

    What pH is required to start precipitation of Fe(OH)3 from a 0.380 M solution of FeCl3? Ksp of Fe(OH)3 = 4.0e-29.
  43. AP Chemistry

    NF2- has (2, 3, 4) regions of high electron density and (2, 4, 6) bonded electrons.
  44. chemistry

    Suggest a technique the student could try to reduce the concentration of the 12 M solution.
  45. chemistry

    Assuming a temperature of 37 C and 1 atm pressure, how many mol/min of CO2 is this?
  46. chemistry

    what is the concentration, in % m/m of a solution prepared from 50.0g sodium chloride and 150.0g of water
  47. Chemistry

    what tests can be run to identify the cation and anion of an ionic compound?
  48. Chemistry

    What volume does a mixture of 14.2 g of He and 21.6 g of H2 occupy at 28 degrees celcius and 0.985 atm?
  49. Chemistry

    How many grams of Mg are needed to react completely with 3.80 L of a 2.50 M HF solution? Mg + 2HF --> MgF^2 + H^2
  50. chemistry

    How many molecules water are produced from 33 g lithium hydroxide? and work the slove
  51. IGCSE 9th grade Chemistry

    Why do tomatoes ripen faster in a greenhouse?
  52. chemistry

    what is the volume in liters of 4.2 moles methane gas, at 26degree C and 1.40 atm?
  53. chemistry

    what is the volume in liters of 4.2 moles methane gas, at 26degree C and 1.40 atm?
  54. chemistry

    to protection of alcohol gruop, which one is better.why. trimethylsyllil or TBSCl
  55. chemistry

    the reaction with ammonium hydroxide with the following metals: Fe3+ Mn2+
  56. Chemistry

    What is the mass of S2Cl2 if 342 grams of S8 is reacted with an excess of Cl2?
  57. Chemistry

    If 100 grams of NI3 is detonated, calculate the Gram of N2 and I2 formed.
  58. chemistry

    how much heat is released when 5.60 moles of NaOH is dissolved in water?
  59. chemistry

    which of the following is a weak base? Why? a. KOH b. NH4+ c. CH3 2- d. HF e. H3PO4
  60. chemistry

    Is there a relationship between HOMO & LUMO and bonding & antibonding? Explain.
  61. Chemistry

    What is the final temperature when 750 J of energy is added to 9.0 g of ice at 0.0 degress C?
  62. chemistry

    If Tums is added to 55.0 {\rm mL} of 0.750 {\rm M}{\rm HCl}, how many grams of {\rm CO}_{2} gas are produced?
  63. organic chemistry

    Draw structural formula 4-propyl-1-methyl-cyclohexene
  64. chemistry

    OF THE FOLLOWING SUBSTANCES, WHICH HAS THE LARGEST AVERAGE SPEED AT 25DEGREES. CO, NH3,H2,N2?
  65. chemistry

    why is the pH very acidic when adding water,naoh, and benzoic acid?
  66. Chemistry

    What mass of NaCl can be dissolved in 7.50 X 10 (to the 2nd)grams of water at 25 degrees C?
  67. chemistry

    what is the half reactions for C12H22O11+ 8KClO2 => 12CO2 + 11H2O + 8KCl
  68. Chemistry

    If 135 g of ice at 0.0°C is added to 2.96 L of water at 85°C, what is the final temperature of the mixture?
  69. chemistry

    If 39.2 of 0.177 is required to neutralize completely 22.0 solution, what is the molarity of the acid?
  70. chemistry

    What physical changes take place within a solid as it melts?
  71. Chemistry

    If 118 g of ice at 0.0°C is added to 1.55 L of water at 88°C, what is the final temperature of the mixture?
  72. chemistry

    how do you calculate grams of KCL in 3 litres of a 5% solution? (scientific notation)
  73. Chemistry

    Argon-39 decays to become Potassium-39. write the nuclear equation.
  74. chemistry

    which of the following 10 g samples will decay the most in 28 days? P-32 Kr-85 Fr-220 I-131
  75. chemistry

    Calculate the equilibrium constant for 2CH3OH(l)+3O2(g)->2CO2(g)+4H2O(l)
  76. Chemistry

    What is the definition of Combined Gas Law? I can't find it in my book anywhere.
  77. Chemistry

    A gas at 1.5 atm, 2.3L, and 23degreeC changed to 1.0 atu and 2.8L. What is the new temperature?
  78. chemistry

    how many half-lives of radon-222 have passed in 11.46 days?
  79. chemistry

    Malarity is to moles of solute over liters of solution as molality is to
  80. Chemistry

    In Zinc blend structure (r[zn2+]+r[s2-]) is equal to? (if edge lenght is a)
  81. Chemistry

    Complete each of the following nuclear equations: a. 239/92U - ? + o/-1e b. 11/5B - 7/3Li + ? thank you!
  82. chemistry

    What are the effects on chemical equilibrium of following; Temperature , Concentration and Pressure.
  83. chemistry

    why the thermal stability decreases across the period in s-block elements ?
  84. chemistry

    What is the concentration of a solution containing 25g of NaCl in a 250mL sample?"
  85. Chemistry

    How many grams of Mg are needed to react completely with 3.80 L of a 2.50 M HF solution? Mg + 2HF MgF2 + H2
  86. Chemistry

    Name the three products formed when tin(II) nitrate is heated. Thank you.
  87. Organic Chemistry

    What will be the result when ketone is added with ethylene glycol and TsOH?
  88. chemistry

    What volume does 627 cm3 of a gas at 14°C occupy at 40°C, if the pressure does not change?
  89. chemistry

    how much hydrogen gas evolves on electrolysis of 1 liter of water?
  90. chemistry

    what is the experimental errors in determining the formula unit of zinc chloride?
  91. chemistry

    is energy considered a chemical reaction that is important to a healthcare professional
  92. Chemistry

    How many milliliters of 1.237 M HCl are required to react with 27.02 grams of MgCO3 ?
  93. Chemistry

    When 320.62 grams of Bi2O3 react with excess of C, how many moles of Bi form?
  94. Chemistry

    For the reaction HNO3+HCl=NO2Cl+H20 What is the equilibrium constant at 25 C and 75 C
  95. chemistry

    What is [H+] concentration in a 4M aq solution of acetic acid (Ka= 1.8 E-5)? what formula do you use to get the answer?
  96. chemistry

    can O3, AsH3 and H2Se act as a lewis acid? please explain.
  97. chemistry

    can O3, AsH3 and H2Se act as a lewis acid? please explain.
  98. chemistry

    what is an ionic compound that forms an acid-base neutralization reaction?
  99. Chemistry

    I need help writting a formula for: AgNO3(l) + PbNO3(l) + HgNO3(l) + HCl (l)
  100. chemistry 101

    How many grams of oxygen are in 40.1 g of calcium hydroxide? options: 17.3 g 8.64 g 20.1 g 0.541 g 11.2 g
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