CHEMISTRY (WEBWORK)

59,669 results, page 98

  1. chemistry

    Breaking the hydrogen bond between two water molecules is called dissociation
  2. chemistry

    how much heat is needed to convert 8.75g of 100c water to steam?
  3. Chemistry

    An object travels at a speed of 7500 cm/sec. How far will it travel in a day?
  4. chemistry

    How much dry solution would it take to prepare 135 0.120M NaNO3 to a sovent?
  5. chemistry

    Ethylene glycol (antifreeze) has a density of 1.11 {\rm g/cm^3}.What is the mass in G of 435mL of this liquid?
  6. Chemistry

    5. A student has the following data: V1 = 822 mL, T1 = 75°C and T2 = -25°C. He calculates V2 and gets -274 mL is this value correct? Explain why or why not.
  7. chemistry

    3H2+N2=2NH3 if 2.70 g of H2 reacts with jugful of N ,how many grams of NH3 is formed?
  8. Chemistry

    Consider the titration of 50.0 mL of 0.20 M NH3 (Kb = 1.8x10^-5) with 0.20 M HNO3. Calculate the pH after addition of 50.0 mL of the titrant.
  9. Chemistry

    What is the empirical formula for a compound which contains 67.1 percent zinc and the rest is oxygen
  10. Chemistry

    5. A student has the following data: V1 = 822 mL, T1 = 75°C and T2 = -25°C. He calculates V2 and gets -274 mL is this value correct? Explain why or why not.
  11. Chemistry

    Name the straight-chain alkane that is a constitutional isomer of 2,4-dimethylhexane. Pls help
  12. Chemistry

    I need some help to draw a Lewis structure for hydrogen cyanide + what is the noble gas?
  13. Chemistry

    In a double-stranded DNA molecule, the percentage of Guanine can never be more than ___%. Why?
  14. Organic Chemistry

    How is the rate of adjusted when using a sand bath as a heat source?
  15. chemistry

    When 15.5 + 0.125 + 2.55 are added, the answer with the correct number of significant figures is
  16. Chemistry

    Calculate the solubility of silver chloride in a solution that is 0.140 M in NH3.
  17. Chemistry

    Is rate of evaporation directly or inversely related to molecular weight
  18. Chemistry

    State the full electron configuration of a free nitrogen atom.
  19. Chemistry

    would you expect calcium to have a higher or lower boiling point than potassium
  20. chemistry

    if you burn 20.2g of hydrogen and produce 1.80x10^2g of water, how much oxygen reacted?
  21. Chemistry

    what is the density of an unknown substance whose mass is 4.5 grams and volume is 5 mil?
  22. Chemistry

    How many grams ofPbCl2will dissolve in 2.00 L of O.650M aqueous Pb(N03)2 solution?
  23. Chemistry

    what is the importance of the weak intermolecular bonding in organic carbon compounds
  24. chemistry

    draw a newman projection of the most stable conformation of 2,3-dichlorohexane looking down the c3-c4 bond
  25. Chemistry

    How much energy (in kcal) is needed to convert 53.2 g of water at 55.0 C to steam at 100.0 C
  26. chemistry

    What is the concentration of a solution, in gsolute/100gsolvent, made using 2.29 g of KNO3 in 2.03 g of H2O?
  27. science chemistry

    balance Redox :- CuS + SO4²- = CuO+SO2
  28. Chemistry

    I do not understand why this cannot go to equilibrium? Na2CO3(aq)+HCl(aq)->H2O(l)+CO2(g)+NaCl(aq)
  29. chemistry

    What quantity of CaCO3 (limestone) on heating will give 112g of CaO?
  30. chemistry

    How many grams of Al(NO3)3 are needed to prepare 25.0 mL of a 0.750 M aqueous solution.
  31. chemistry

    I have a balance equation but i need to know how to find the different states of each element. How do I do that? Ca + 2 HNO3 => Ca(NO3)2 + H2
  32. CHEMISTRY

    15.0g of KCLO3 was crushed and heated with about 0.1g of MnO2.Write an equation for the reaction.
  33. chemistry

    How many grams of nacl are required to completely neutralize 100 ml of 1M h2so4?
  34. Chemistry

    How can you prove that mass is being conserved when adding baking soda to vinegar?
  35. Chemistry

    Ammonium phosphate and nickel(II) nitrate solutions are mixed, what precipitates out?
  36. chemistry

    If a block of wood with the length 1.05 m, height 5.24 cm, and width 3.36 cm and a mass of 2.56 kg what is the density?
  37. Chemistry

    What chemical test (axcept a magnet) to use to distinguish between iron and sulphur?
  38. chemistry

    Dissolve 50g of sodium hydroxide in 1 litres and determine the normality
  39. Chemistry

    Calculate the pH of a mixture of 20.0 mL of 0.150 M HCl and 10.0 mL of 0.300 M NaOH.​[7.00]
  40. Chemistry

    what effect does a catalyst have on.. a) energy of the reactants b) enthalpy change of the reaction
  41. Chemistry

    In an acid/base titration, why must the indicator (phenolphthalein) be a strong dye?
  42. chemistry

    What is the longest possible continuous corbon chain in the compound 3,5,5-trimethyloctane? 10, 9, 8,or 6 carbons?
  43. Chemistry 12th

    How can you prepared to benzo phenol from phenyl magnetium bromide
  44. Chemistry

    An aqueous solution of (NH4)2SO4 has a pH lower than 7. Explain this observation. Thanks! :)
  45. Organic chemistry

    is benzoic acid soluble in water, 1.0M NaOH, 1.0M HCl?
  46. chemistry

    3. Find the molarity of a solution made from 734 g of Li2SO4 and 2.5 L of water
  47. chemistry

    calculate the percentages by mass of the component element in sodium trioxonitrate(v)
  48. Chemistry

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

    If you mix 10 mL of 6M HCl (aq) and 2o mL of 3M NaOH, will the solution be acidic, neutral, or basic?
  50. Chemistry

    what kind of reaction is this Sr(NO3)2 (aq) + K2CrO4 (aq) = SrCrO4 (S) + 2KNO3 (aq) and does it take place or NR, why?
  51. Chemistry

    what is dispersion,dipole,hydrogen bonding for NaF,N3H,NaBr.
  52. Chemistry

    Which symbol correctly represents an element (D) whose atoms contain 15 protons and 20 neutrons? A. 20/15 D B. 15/20 D C. 35/15 D D. 15/35 D C?
  53. AP Chemistry

    What is the redox reaction of (i don't understand how to do this): MnO4-(aq) + H2O2(aq) -> Mn2+(aq) + O2(g)
  54. Chemistry

    Write and balance equation for the complete combustion of decane, C10H22
  55. Chemistry

    What is(are) the precipitate(s) that form when K2SO4, BaCl2, and AgNO3 solutions are mixed?
  56. Chemistry

    Which value is most likely to be the pH of a salt that is formed by the reaction of a strong acid and a weak base
  57. Chemistry

    A sample of NH3 gas occupies 75.0 liters at STP. How many molecules is this?
  58. chemistry

    do the arithmetic and give the answer to the correct number of significant figures. (1.5 x 10^-4 x 61.3) + 2.01 =
  59. Chemistry

    I have to do an A4 page about Isotope uses and all the websites ive gone on are too complicated for me to understand. Does anyone know any uses of Isotopes?
  60. Chemistry

    How many moles of ions are released when this sample dissolves in water? 26.4 g of Ba(OH)2·8H2O
  61. Chemistry

    to determine the concentration of ascorbic acid in fruit juice using DCPIP
  62. Chemistry

    Name one structural and one chemical difference between acetylene and ethylene. Give reasons.
  63. Chemistry

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

    How many molecules are in 105 g of sugar (C12H22O11)? Answer in units of molec
  65. Chemistry

    All the following are necessary parts of a neutralization reaction except A) an acid B) an indicator C) water D) a salt.
  66. chemistry

    name a metal carbonate that doesn't decompose when heated with a bunsen burner.
  67. Organic Chemistry

    Different conformers of C3H7Cl? I know that there are different constitutional isomers. But, Im not sure about the conformations.. Please help and explain this to me!! Thank you!
  68. Chemistry

    What factors do you need to consider if you wish to use the volumetric method for preparation of stock ethanol solutions?
  69. chemistry

    calculate the momentum of a particle ,whose de Broglie's wave length is 0.1nm ?
  70. Chemistry

    Last one. Describe how you would prepare 100ml of a solution that is 22% acetic acid by volume?
  71. Chemistry

    How many moles of nitric oxide are formed from 0.60 mole of nitrogen dioxide
  72. Chemistry

    Calculate the percent composition by mass of each element in Al(OH)3 Use at least 3 significant figures. %Al = %O = %H=
  73. chemistry

    how many numbers of oxygen molecules are present in 3 litres of CO2 at STP?
  74. Chemistry

    What volume of 0.130 M NaOH is needed to neutralize 4.00 g of benzoic acid?
  75. Chemistry

    Which of the following groups has the species listed correctly in order of increasing radius? 1. Mg +2, Ca +2, Ba +2 2. Fe, Fe +2, Fe +3 3. Na, Mg, Al 4. Br-, Cl-, F- 5. K+, Na+, Li+ Is it 1. Mg +2, Ca +2, Ba +2 ?
  76. college Chemistry

    Ok this is the question... Complete the combustion of butane... CH3CH2CH2CH3 + O2 ====> ____________
  77. Chemistry

    What causes cycloalkanes to have two less hydrogen atoms than similar alkanes that are open chain ones?
  78. Chemistry

    How many moles of a gas are present in 2.0L cylinder at 1.50 atmospheres and 17 degree's celcius?
  79. Chemistry

    What gas is produced when hydrochloric acid is reacted with ammonium carbonate?
  80. chemistry

    Ethylene glycol (antifreeze) has a density of 1.11 g/cm^3 What is the volume in liters of 3.42 kg of this liquid?
  81. general chemistry

    the radius of a chlorine atom is 99 pm and its mass is 5.89 X 10^-23 grams what is the density
  82. chemistry

    STRUCTURE OF HNO4,(CH3)2SO,(CrO4)2-,NH4NO3,FNO3
  83. chemistry

    describe how to prepare laboratory test Co2 through a dry sample?
  84. chemistry

    Given the plot of 1 vs 1ni2, what is the value of nf? y=-0.011x+0.0027 R^2=1 1/n(initial)^2=.04 1/lambda=.0023
  85. chemistry

    Which of the following bases could you write an equilibrium expression for? A. Ba(OH)2 B. KOH C. NaOH D. NH3
  86. chemistry

    What mass of water is produced from the complete combustion of 2.50×10−3 of methane?
  87. chemistry

    30 ml of 0.1M sodium acetate and 15 ml of 0.1 M hydrochloric acid was mixed together. What is the pH of the resulting solution?
  88. Chemistry

    What is the balanced equation for the reaction between sodium tetraborate and sulfuric acid?
  89. Organic chemistry

    What are the examples of compounds extracted by solvent diethyl ether?
  90. Chemistry

    Calculate the mass of a 0.253-mL sample of a liquid with density 0.789 g/mL
  91. Chemistry

    Which of the following indicates the greatest pressure? A) 1 atm B) 777 torr C) 5.5 mm Hg D) 1000 Pa E) 12 psi
  92. Chemistry

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

    what current will be able to produce 20 volume of chlorine by electrolysis at STP within one hour?
  94. chemistry

    write the reaction for the neutralization of nitric acid with calcium hydroxide.
  95. Chemistry!!

    At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? THANKS! -J
  96. chemistry

    What are the steps in finding the balanced equation for the complete combustion of benzene?
  97. Chemistry

    Na2CO3(aq)+ 2HNO3(aq)--> 2NaNO3+H2O(l)+CO2(g) how do I get net ionic?
  98. Chemistry

    What is the ionic equation for (NH4)2CO3=2NH3+CO2+H2O
  99. chemistry

    sodium cyanide nacn, contains how many single, double or triple bond?
  100. chemistry

    Calculate the amount of heat (in calories) released when the 1.2 g sample was burned.
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