CHEMISTRY (WEBWORK)

58,868 results, page 91

chemistry

what is the minimum of amount of KCN in moles needed to extract 29 grams of gold

Chemistry

550 mL of Ar at 632mm Hg will occupy what volume at 750mm Hg with the temperature remaining constant?

Chemistry

What role does a catalyst play in a chemical reaction in terms of rate and yield

chemistry

Which of the following does NOT belong with the others? A. HCl B. HNO3 C. H2O2 D. H3PO4 I say A

chemistry

Which ion is absorbed by a base in water? A. H3O+ B. OH- C. Neutron D. Transition metal B

chemistry

Calculate the mass in grams of 2.50 mol iron(II) hydroxide. A. 29.5 g Fe(OH)2 B. 184.5 g Fe(OH)2 C. 225 g Fe(OH)2 D. 3.38 x 10-2 g Fe(OH)2 C

chemistry

how many liters of O2 gas measured at 784mmHg and 25'C are required to completely react with 2.3 mole of Al?

chemistry

how many atoms of each element are present in five formula units of calcium permanganate?

chemistry

How many grams of solute are required to prepare 500ml of 0.5M urea solution,CO(NH2)2?

chemistry

What volume will a mixture of 5.00mol of He and 0.800 mol of CO2 occupy at STP?

chemistry

what is the molarity of the acid in when a 30mL sample of HCl is titrated with 10mL of 6M NaOH?

Chemistry

Hi, I need help with something. What are the correct formulas and names of manganese and oxygen compounds.

Chemistry

What is the final volume (L) of a 1.00 L system at 315 K and 1.10 atm if STP conditions are established?

chemistry

How many atoms of tin are necessary to react completely with 7.42 x 10(24th)g of HF. Sn(s) + 2HF(g) = SnF2(S) + H2 (g)

Chemistry

How many hours are required for the deposition of 15.0 grams of Al from molten AlCl3 by a current of 15.0 amps?

Chemistry

You dissolve 17.1 gms of sucrose (sugar) in 100 mL of ethanol 20ºC. What is the molarity (M)?

Chemistry

Is the bond in the molecular orbital energy level diagram of Li2 stable?

Chemistry

What element is undergoing oxidation (if any) in the following reaction? CH4(g) + 2 O2(g) ¨ CO2(g) + 2 H2O(g)

Chemistry

Write equatios for the ionization of the following acids. (a)HF , (b)H2SO3 , (c)CH3COOH , (d)HNO3.

Chemistry 3A

what is the maximum number of electrons that may occupy the second electron energy level?

Chemistry 3A

what is the maximum number of electrons that may occupy the second electron energy level?

chemistry

2NaClO2---> 2NaCl + 3O2 if 3.85 grams of NaClO3 react, how many moles of O2 are created?

Chemistry

What is the name (NOT THE NUMBER) of the group whose elements carry a neutral charge?

Chemistry

The relationship between ionization energies as evidence for electron configuration for elements?

chemistry

Only pure substance are homologous,true or false? Can you please explain too?

chemistry

Calculate the degree of polymerization n of polystyrene with a molecular weight of 3.091*10^6 g/mol.

Chemistry

How do you demonstrate that fog, clouds,and steam are liquid droplets and not water vapor?

chemistry

what is the limiting reagent in a reaction between copper sulfate and barium nitrate?

Chemistry

How do you write the chemical equation of the dissociation of nicotinic acid, C5H4NCOOH, in water?

Chemistry

Calculateenthalpychangeforthereaction2N2(g)plus 5O2 gives 2N2O5 Basedonthefollowinginformatin2H2(g)plusO2(g)gives2H2O(l)

chemistry

can i mix hypochlorite powder and baking soda to make a bleach solution?

Chemistry

Calculate the mass concentration of H2SO4 in a solution of 36%, with density 1.84g/cm3

chemistry

23 grams of NaOH is dissolved in 1.5L of water, find; a)Concentration of the solution b)pOH c)pH

chemistry

Determine the mass of CO2 gas that has a volume of 7.10 L at a pressure of 1.11 atm and a temperature of 31.0°C.

Chemistry 12

which of the following 0.10M solutions is basic? A LiCl B K3Po4 C NaCLO4 D NH4NO3 Is it C?

chemistry

how would you prepare a 550ml of 0.350 normal calcium chloride solution

Chemistry

Let say Pb(NO3)2 combine with FeCl3, would this yield PbCl + Fe(NO2)3? Thanks

chemistry

25g of NaCl is deissolved in 100g of water. what is the concentration in percentage by mass?

Chemistry

Theres an airplane with a mass of 5.4g, 305. mm long, moving at 1.8m/s. Is it classic or quantum?

Chemistry

How much heat energy, in kilojoules, is required to convert 36.0g of ice at 18.0C to water at 25.0C

chemistry

when 2.31 moles of sulfur hexafluoride are synthesized from te elements, how many grams of fluorine were used

chemistry

is the osmotic pressure formed by dissolving 50.9 mg of aspirin (C9H8O4) in 0.450 L of water at 24°C

chemistry

Iwish to prepare 3% NH3 from 20ml strong NH4OH and 180ml H2O.Can you help me?

chemistry

What is the molarity of the solution containing 6.245g of oxalic acid, H2C2O4 in 750mL

chemistry

How many grams of rubidium chloride are present in 125.0 mL of a 1.75M RbCl solution?

chemistry

What is the mass of 3 moles of barium? Round to the nearest tenth. Don't forget the units.

chemistry

How many grams of copper can be dissolved by 20.0 mL of a 69.6% (by mass) nitric acid solution that has a density of 1.41 g/mL?

ap chemistry

What is the density of hydrogen sulfide (H2S) at 0.9 atm and 295 K? Answer in units of g/L

Chemistry

Explain the raise of bonding angle in these molecules: HF, H2O, NH3 and CH4

Chemistry

CHemical equation showing how NH3 behaves as a base when dissolved in water

Chemistry

How many milliliters of water has been dispensed if the initial buret reading was 0.38 ml and the final is 24.70 ml

chemistry

In terms of kinetic theory explain why tyre should not be over inflated

Chemistry

Given a very concentrated glycercol solution. Dilute it to 7.5 fold dilution. How do I do this ?

chemistry

If 22.4 dm3 of steam react with MgO, calculate the mass of the product that will form.

chemistry

What is the density of a 16.54 g object if the dimensions of the block are: length = 12.6 mm height = 1.91 cm width = 0.0140 m

Chemistry

Calculate the density a gas will have at STP if its molar mass is 41.8 g/mol.

Chemistry

What volume in liters would contain 5.30 x 10^24 molecules of hydrogen gas at STP?

chemistry

Calculate the amount of zirconium produced (in kg) if a reactor were charged with 261.0 kg ZrCl4 and 25.0 kg Na .

CHEMISTRY

WHAT IS THE MEANING OF THE NUMERICAL REPRESENTED BY X IN THE GENERAL FORMULA FOR HYDRATE; SALT H2O?

college chemistry

Why is it that sodium chloride or acetic acid can't bee steam distilled??

Chemistry

Calculate the volume in liters of the gas (O2) at STP if it was massed at 6.75 x 105 grams.

Chemistry

How many moles of magnesium sulfate are needed to make in a solution of 0.10g Mg2SO4?

Chemistry

How much 5M KOH must be added to 1.0 L of 0.1M glycine (pKa 9.6) at pH 9.0 to bring its pH to exactly 10.0?

Chemistry

calculate the amount of energy required to vaporize 43.0g of water at its boiling point

chemistry

If you are given 718 grams of lead (iv) oxalate, how many atoms of oxygen do you have?

chemistry

1040 grams of chlorine gas at STP would have what volume?

Chemistry

Would you balance this one SO2 + O2. SO3 Like 2SO2 + O2. 2SO3

general chemistry

In an appropriate reference read a dicussion of mass and volume measurements

chemistry

What volume of oxygen would be required for the complete combustion of 23.4g of benzene, C6PO4?

Chemistry

What are the attractive forces that increase surface tension? -Would it be cohension and adhension? Thanks

Chemistry

If 15gram of potassium trioxochlorate V is heate in MnO2.What is the mass of chloride produce

Chemistry

How many mols of OH-(aq) ions are present in 20.33mL of 1.33M sodium hydroxide solution?

Chemistry

Why is why is CH4+2O2 --> CO2+2H2O very slow at room temperature?

general chemistry

Calculate the molarity of each of the following solutions.70.8g C2H60 in 2.51L of solution

chemistry

which alkali metal form superoxidess?(2)explain why rubidium has a short life?

Chemistry

What is the pH of a 0.77M solution of methylamin at 25 degree C? CH3NH2, Kb= 4.4X10-4? How do I set this up to get the answer?

Chemistry

1.55 g of penatanol 250ml water Heat from 10 to 38 degrees Find hear of combustion

please help analytical chemistry

what is the activity coefficient of SO4^2- when the ionic strength of a solution is .1?

Chemistry

How many grams of Na3PO4 are needed to produce 250mL solution that has an Na concentration of 1.04M?

Chemistry I

Determine the hydronium ion concentration in a solution that is 0.00018 M Ca(OH)2. Answer in units of M

Chemistry

2H2O --> 2H2 + O2 if 30 mL of hydrogen in the above reaction, how many milliliters of oxygen are produced?

Chemistry

2H2O --> 2H2 + O2 if 30 mL of hydrogen in the above reaction, how many milliliters of oxygen are produced?

Chemistry

2H2O --> 2H2 + O2 if 30 mL of hydrogen in the above reaction, how many milliliters of oxygen are produced?

Chemistry

How many moles of NaOH must be added to 1.0 L of 2.2 M HF to produce a solution buffered at each pH? (a) pH = pKa (b) pH = 4.24 (c) pH = 4.60

Chemistry

What is the molarity of nitrate ions in a solution containing 2.20 mg of Mg(NO3)2 dissolved in 7.35 L of water?

Chemistry

When 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, how many grams of water are formed?

chemistry

How do you sole this problem: how many grams of CaCl2 are needed to prepare 7.25 L of .015M solution?

Chemistry

You are to prepare a KH2PO4 and Na2HPO4 solution with pH=7.31. What should the concentration of [2(HPO4) 2-] / [H2PO4-]

Chemistry

The Ksp of magnesium hydroxide, Mg(OH)2, is 5.61 × 10^-12. Calculate the molar solubility of this compound. Is the answer 1.1*10^-4 M?

chemistry

how many grams of Na2SO4 can be produced by the reaction of 250g of NaOH with sufficient H2SO4?

chemistry

How many moles of sulfate ions are in 100 ml of a solution of .002 M Fe2(SO4)3?

chemistry

the enzyme that takes in the SO2−4 that provides the sulfur atom for cysteine.

chemistry

if the molar mass of BaCl2 is 208.3 g/mol, how many grams are present in 0.25 moles?

Chemistry

How many grams of C6H12O6 must be added to 0.750 kg of water to make a 1.25 m solution?

Chemistry

Name the organic product of the following nucleophilic substitution reaction. OH+CH3CH2I

Chemistry

7. A solution is prepared by dissolving 8.5 g NaHCO3 and 12.7 g Na2CO3 in 500.0 mL of water. Calculate the pH.

Chemistry

7. A solution is prepared by dissolving 8.5 g NaHCO3 and 12.7 g Na2CO3 in 500.0 mL of water. Calculate the pH.

Chemistry

Why does the color of Methyl Orange change at all in he presence of buffer components?

chemistry

what is the total heat lost if you have 8 grams of copper and the temperature changed from 43°C to 36°C

Chemistry

What are the reducing agent and the oxidising agents in the synthesis of ammonia from hydrogen and nitrogen?

Pages

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
  17. 17
  18. 18
  19. 19
  20. 20
  21. 21
  22. 22
  23. 23
  24. 24
  25. 25
  26. 26
  27. 27
  28. 28
  29. 29
  30. 30
  31. 31
  32. 32
  33. 33
  34. 34
  35. 35
  36. 36
  37. 37
  38. 38
  39. 39
  40. 40
  41. 41
  42. 42
  43. 43
  44. 44
  45. 45
  46. 46
  47. 47
  48. 48
  49. 49
  50. 50
  51. 51
  52. 52
  53. 53
  54. 54
  55. 55
  56. 56
  57. 57
  58. 58
  59. 59
  60. 60
  61. 61
  62. 62
  63. 63
  64. 64
  65. 65
  66. 66
  67. 67
  68. 68
  69. 69
  70. 70
  71. 71
  72. 72
  73. 73
  74. 74
  75. 75
  76. 76
  77. 77
  78. 78
  79. 79
  80. 80
  81. 81
  82. 82
  83. 83
  84. 84
  85. 85
  86. 86
  87. 87
  88. 88
  89. 89
  90. 90
  91. 91
  92. 92
  93. 93
  94. 94
  95. 95
  96. 96
  97. 97
  98. 98
  99. 99
  100. 100