CHEMISTRY (WEBWORK)

59,576 results, page 13

  1. English

    Hello! I will type 2 exercises from the lesson I am teaching on Wednesday-english as a foreign language - 8th graders ( it will be graded) I need you to help me with some ideas. It says: LEAD- IN: A Here is a list of some natural sciences: BIOLOGY CHEMISTRY PHYSICS BOTANY ...
  2. Statistics- Math

    One student scored 54 on a math test for which the mean score was 50.5 and the standard deviation was 3.2. Another student scored 80 on a chemistry test for which the mean score was 75.2 and the standard deviation was 5.2. Which student (math or chemistry) had a "better" score...
  3. chemistry

    Please help!!! Desperate for answer!!!? Did the equation do not know the 2nd questions"s answers for the problems a) 2O3(g) = 3 O2(g) + heat (O3 IS UNDERLINED) [6.0x10-1] [0.21] b) 2 CO2 (g) + heat = 2 CO(g) +O2(g) (CO IS UNDERLINED) [0.103] [0.024] [1.18 x10-2] c) NO2(g) + O2...
  4. chemistry

    Table of enthalpy of solution for selected cesium salts Compound and ΔsolH kJ mol-1: - Cesium bromide: 25.98 - Cesium iodide: 33.35 - Cesium chloride: 17.78 - Cesium fluoride monohydrate: -10.46 - Cesium fluoride sesquihydrate (·1.5H2O): -5.44 Data taken from CRC ...
  5. Chemistry Help! Thank you :)

    Assuming the final solution will be diluted to 1.00 , how much more should you add to achieve the desired pH? Information: Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pH of 2.80. You have in front of you: 100 ml of 7.00×10−2 M HCl...
  6. Chemistry

    Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pH of 2.70. You have in front of you * 100 mL of 6.00×10−2 M HCl, * 100 mL of 5.00×10−2 M NaOH, and plenty of distilled water. You start to add HCl to a beaker of water when ...
  7. Chemistry

    Chapter 3 41. How many significant figures are in each?
  8. chemistry

    What are the units for E minimum? with reference to what?
  9. chemistry

    why is CCl4 classified as a compound?
  10. Chemistry

    Is air a mixture or a coumpound?
  11. Chemistry

    Why air is classified as matter?
  12. chemistry

    What are some examples of a suspension?
  13. chemistry

    how can you find temperature of sodium?
  14. chemistry

    what is the exponent power of a liter??
  15. Chemistry

    Is there an equation for acid rain? What is it?
  16. chemistry

    the value of this quantity for water is ?
  17. chemistry

    what is produced when methane is burned ?
  18. chemistry

    convert 0.75 kilograms to milligrams
  19. Chemistry

    How many atoms of C are contained in 45.6g of C6H6?
  20. chemistry

    What is the hydroxide concentration if the hydronium is .03 M?
  21. chemistry

    how do you read this formula: 2Au2O3
  22. chemistry

    How do I figure out the mass of 1 M&M?
  23. Chemistry

    How many moles of CaCO3 are present in 30.6g of it ?
  24. Chemistry

    What is the mass of 8.25 * 10^19 UF6 molecules?
  25. Chemistry

    how would i find the pH of this? 1.0 M NH3 (Kb = 1.8 x 10-5)
  26. Chemistry

    How many electrons in an atom can have n=3, ml=+1 and ms=+1/2
  27. chemistry

    what is the flame test for nickel
  28. chemistry

    Why is the formal charge on B in BF4- is 1?
  29. chemistry

    what is an example of a solid hydrocarbon
  30. Chemistry

    What is enthalpy in layman's terms?
  31. AP CHEMISTRY

    how do i calculate theoretical yield?
  32. Chemistry

    what is the volume of the unit cell
  33. Chemistry

    What is electron configuration of Bi5+?
  34. chemistry

    how many moles of platinum are equivalent to 1.20 x 10^24
  35. chemistry

    when will a displacement reaction not occur?
  36. Chemistry

    what precipitate (if any) will form? Al(NO3)3 (aq) + Ba(OH)2 (aq)
  37. chemistry

    Why can water dissolve so many substances?
  38. chemistry

    why are ions of physiologic importance?
  39. Chemistry

    What is the Lewis structure for IF4-?
  40. PLEASEE HELP CHEMISTRY

    What is partial pressure?
  41. chemistry

    What is the pH of a 1.24 mol/L solution of HCN(aq) if its Ka = 6.2 x 10-10
  42. Chemistry

    Convert 125000 Pa to psi
  43. chemistry

    covert 19.4g NH3 to moles
  44. organic chemistry

    why can't you have 2-ethylheptane?
  45. physics

    What model is the basis for chemistry?
  46. chemistry

    what is c3h8 dioxide or hydrogen
  47. chemistry

    how many neutrons r there in a phosphorus atom
  48. Chemistry

    what is the pH level of an average lake
  49. chemistry

    Draw 5-methyl-3-heptene
  50. chemistry

    determine the pH of this solution. [OH-]=4.25 * 10^-5 M. Is the answer 4.37??
  51. chemistry

    give electron configuration for a> Na b) Na+ c) O d)O ^2-
  52. chemistry

    sorry Ksp of PbCl2 is 1.6 x 10-5
  53. chemistry

    what is average kinetic energy?
  54. chemistry

    Draw 1- fluoro 2- iodobenzene
  55. Chemistry

    How can i find the abundance of an isotope?
  56. chemistry

    What is the pH if the hydrogen-ion concentration is 6.8 x 10^-7 M?
  57. chemistry

    chemical technology definition
  58. chemistry

    chemical technology definition
  59. chemistry

    Atomic nature of glucose
  60. chemistry

    calculate the number of liters in 7.05 x 10 ^-2 m^3
  61. chemistry

    16.3g equals how many cg? someone helllllllllllp
  62. 11th grade

    what exactly is chemistry?
  63. Chemistry

    What si the pH of a solution of 10^-8 M HCl in H2O?
  64. chemistry

    what is not viewed with an electron microscope
  65. chemistry

    examples of suspension and solution
  66. Chemistry

    what is the formula to change the temperature of K to C
  67. chemistry

    What is the mass in grams of 14.6 amu?
  68. Chemistry 101

    How many kg of chlorine are in 23 kg of CF_2Cl_2?
  69. chemistry

    what is the 'big idea of energy'???!
  70. chemistry

    define organic compound?
  71. Chemistry

    At the equivalence point for CH3COOH, the pH will be?
  72. chemistry

    does fire have matter?
  73. Chemistry

    How do you find molar mass?
  74. Chemistry

    NaC2H3O2 (aq) + HCl (aq) = NaCl (aq) + ?
  75. Chemistry!

    Are hydrocarbons always nonpolar??
  76. chemistry

    can u tell me a slogan for flourine?
  77. chemistry

    What is the smalles t subatomic particle
  78. Chemistry

    what does excited states mean?
  79. Chemistry

    What is the diameter of a potassium atom?
  80. chemistry

    What is the ΔH0rxn. for NaNO3?
  81. Chemistry

    what is the big idea of energy
  82. Organic Chemistry

    1-Methylcyclohexene + HCl/Ph-O-O-PH -->
  83. Chemistry

    is Lead II Dichromate soluable?
  84. chemistry

    what is the big idea of energy?
  85. Chemistry

    How does a ionic bond form?
  86. Chemistry

    Why does O3 have a dipole moment?
  87. Chemistry

    How Many Molecules are contained in 0.25 moles of Fe?
  88. chemistry

    How do I change grams to moles.
  89. Chemistry

    What is the weight/volume for a 0.2% solution?
  90. chemistry

    How to make a 2 Molarity solution?
  91. chem

    need help on chemistry below
  92. chemistry

    is iron sulhide malleable
  93. Chemistry

    How would you name the compound P4?
  94. Chemistry`

    1.35 x10^24 g to pounds and then to ounces
  95. Chemistry

    hOW can I convert 75.0 cmHg to atm? thanks
  96. chemistry

    2.05g k x___x___x___=____gkcl
  97. Chemistry

    What is the purpose of a nuclear reactor?
  98. Chemistry

    Give an example of a disaccharide
  99. chemistry

    Plz Help or give a highlight
  100. chemistry

    how many moles are in 25.0 grams of potassium?
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