CHEMISTRY (WEBWORK)

59,669 results, page 3

  1. General Chemistry

    The four quantum numbers for the last electron placed in the orbitals of a certain element are: n=3 l=2 m of l=0 and m of s=-1/2. What is the element? I need help with this part of chemistry I have NEVER understood this ever. I know how to do the configurations but not this. I...
  2. chemistry

    If 13.5 ml of concentrated (17.0 M) of sulfuric acid was spilled on the chemistry counter, calculate the mass of sodium bicarbonate needed to neutralize the acid
  3. chemistry

    hi Dr Bob..can you please help me with this chemistry problem? I got problem dealing with the chemical formula.How i want to find the number of moles of 2g of Fe(NH4)2(SO4)2.6H2O???please help me.Thank you
  4. Chemistry

    At 1 atm, how much energy is required to heat 67.0 g of H2O(s) at –14.0 °C to H2O(g) at 115.0 °C? Please explain, I'm not very good at Chemistry and this problem is giving me a headache. Thank you!
  5. Chemistry

    What is the chemistry behind caffeine extraction with Na2SO4, CH2CL2 and NaCO3. I know that Na2SO4 some how aborbs the water from a solution leaving the undissolved soilds or something...
  6. Chemistry

    The speed of sound is 3.40 times 10^4 cm/sec. What distance in meters can sound travel during a 48-minute chemistry lecture?
  7. Chemistry

    Can someone explain for organic chemistry naming, when something would be given something like "iso" in it or when we would say "s-butyl" or "t-propyl" etc., with "s" meaning secondary and "t" meaning tertiary.
  8. chemistry

    where can i find printable worksheets from prentice hall for chemistry? I looked, but could not find any from PH online for any grade level. nor did I.
  9. Chemistry

    We're doing a spontentaity lab in chemistry and I wanted to make sure I was using the right equation to do the questions! Could someone make sure this is right?? q system = - (q water - q calorimeter)
  10. Chemistry quistion help!

    I need help answer this question for a chemistry homework. What are the products in a reaction between an acid and a base? How can you tell that a reaction has occurred?
  11. Chemistry

    How to do significant values in Chemistry? I am totally stuck; I have no idea what to do? My teacher gave me C due to the significant value error. Please help
  12. chemistry

    A certain monoprotic weak acid with Ka = 6.7 × 10-8 can be used in various industrial processes, but is no longer used in chemistry teaching labs because it tends to explode when it gets old. (a) What is the [H+] for a 0.558 M aqueous solution of this acid and (b) what is its...
  13. Chemistry

    I have a question in chemistry about combining compounds. I didn't really understand from my teacher. I have to combine Pb(NO3)2 with Na4OH. Also combine CaCl2 with Na2SO4. Can someone explain.
  14. Dr.Bob - Question

    I'm know I'm interested in the chemistry field. The problem is that I have to further narrow down my field of interest. I was curious to know what type of chemistry did you specialize in in the past. -christina
  15. Chemistry-Dr. Bob

    Please help me in any way to relate the concepts of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. I appreciate any direction or info you could provide, Dr. Bob Thank you
  16. Chemistry A.P.

    Hi there, I need some help with my homework problem for chemistry, What is the balanced thermochemical equation for glucose (C6H12O6) and O2 gas form CO2 gas and liquid water?
  17. physical chemistry

    This question is about a lab called Heats of Ionic Reaction in my Physical Chemistry class. I need to know why there should be a large percentage error in deltaH4
  18. Chemistry

    Need help with Chemistry, thanks in advance! For the system: 2H2O(g) ↔ 2H2(g) + O2(g) ; at equilibrium 27.0g of H2O, 0.25g of H2 and 16.0g of O2 was found in a 5.0L flask. Calculate the equilibrium constant, Keq.
  19. chemistry ............chemistry

    if you had to design a firework show for a Christmas celebration , what elements would you include in the fireworks ? why ? I knew u post answer for me , but i can't find it . May you answer for me? Thank you so much !!
  20. CHEMISTRY

    1.Chemistry Question: A 0.1 M solution of acetic acid is titrated with 0.05M solution of NaOH. What is the pH when 60% of the acid has been neutralized? The equilibrium constant (Ka) for acetic acid is 1.8x10^-5 2. Chemistry question: On average, how far is a molecule of air ...
  21. chemistry

    Maxine is studying about electrolytes in her chemistry class. The teacher asks her to test 4 different solutions to determine how well each one conducts electricity. which solution will best conduct electric current? a) HC2H3O2 b) C2H5OH c) KOH d) H2O2
  22. Chemistry

    1. Chemistry is the study of the composition, structure and properties of substances.- F? 21. Which is found in the nucleus-- Protons or neutrons? 27. Copper metal is: a. poor conductors b. brittle c. malleable C? 44. What is the charge on most polyatomic ions? - Negative ...
  23. Chemistry

    Calculate the pH of a potassium phosphate buffer if the pKa of KH2PO4 is 7.2 and the acid-base ratio is 2:1 I took Chemistry 7 years ago and am in a review for a Biochem course I am takin. I do not remember the basics so any help with how to get started or what equations to ...
  24. Chemistry

    Maxine is studying about electrolytes in her chemistry class. The teacher asks her to test 4 different solutions to determine how well each one conducts electricity. which solution will best conduct electric current? a) HC2H3O2 b) C2H5OH c) KOH d) H2O2
  25. Chemistry

    How is Surface catalyst(heterogeneous) and homogeneous catalyst different? I'm in 10th grade chemistry and I don't understand it.
  26. Chemistry(Mastering Chemistry HELP )

    Convert 2.868*10^10g to kg, Mg, and mg For kg, I put .002868 and 2.868*10^-3 but the computer said neither are correct. HELP PLEASE! (:
  27. Clinical Chemistry

    Anyone here good with clinical chemistry, particularly separation assays and high performance liquid chromatography?
  28. Chemistry

    What is weighted average in chemistry?
  29. chemistry

    Chemistry Suspension Examples...]
  30. AP CHEMISTRY

    Someone please answer my question below in AP CHEMISTRY.
  31. CHEMISTRY

    WHAT RELATION DOES CHEMISTRY HAVE TO ART?
  32. chemistry

    what topics are under periodic chemistry?
  33. chemistry

    Abstract 4 chemistry of starch
  34. Chemistry

    Road map in chemistry ?
  35. Chemistry

    What are the parts of a calorimeter used in chemistry?
  36. chemistry

    which topics are under periodic chemistry II?
  37. chemistry

    Chemistry Suspension Examples...
  38. CHEMISTRY URGENT

    Does anyone have a "Chemistry in Context 6th edition" by mcgraw and hill book? I don't have one and my homework is in there. Page 30, questions 5,6 & 7. If you could, type out the questions for me that would be a HUGE help.
  39. Chemistry

    I know that this is an off topic question, but I need you to respond to this.... I received barely an A in my chemistry class, and my teacher gave me a 2/25 on an assignment... Although I got that grade, I still have an A.. I asked my teacher why and she said that it is not ...
  40. Chemistry

    In studying the chemistry and qualitative analysis of anions, why wouldn't HCl be a good acid to use to determine the solubility of a silver precipitate in acid solution?
  41. Chemistry

    I know that this is an off topic question, but I need you to respond to this.... I received barely an A in my chemistry class, and my teacher gave me a 2/25 on an assignment... Although I got that grade, I still have an A.. I asked my teacher why and she said that it is not ...
  42. AP Chemistry

    What is meant by minimum and maximum energy problems. Are there different equations to find them. What does this conceptually mean? * This is dealing with quantum chemistry such as plancks equation, and debroglie equation.
  43. math sets

    out of 320 students at a university,190 taking math,235 taking chemistry and 120 taking physics.125 are taking both chemistry and math,95 taking both chemistry AND PHYSIC,55 TAKING BOTH MATH AND PHYSICS.HOW MANY ARE TAKING ALL THE THREE SUBJECTS
  44. Chemistry

    I was given extra credit to find who Le Châtelier's High School Principal was. Not his PrincipLE, but his PrincipAL. My chemistry teacher told us only one student of his out of all these years came with the answer. Think outside of the box. Thanks.
  45. To Ron: Chemistry 12

    I've deleted your 14 chemistry questions because you've made no attempt at answering them. This is not a site to dump homework questions like so much garbage to be disposed of. If you'd like to repost any of them with your answers, someone may be able to check them.
  46. Chemistry

    I was given extra credit to find who Le Châtelier's High School Principal was. Not his PrincipLE, but his PrincipAL. My chemistry teacher told us only one student of his out of all these years came with the answer. Think outside of the box. Thanks.
  47. organic Chemistry

    In my Organic chemistry lab, the calculated enantiomeric excess was over 100% . Is this possible? and If not, what sort of error could have been made? *the observed optical rotation was read correctly
  48. chemistry

    There is a ball with a mass of 1000 lbs. It's turned into wire with a diameter of 3.12 x 10^-1 How long is the wire? This is my crazy chemistry teacher's idea of a test...and I don't even think there's a solution. HELP ME
  49. Chemistry

    A 334-mL cylinder for use in chemistry lectures contains 5.225 g of helium at 23 C. How many grams of helium must be releasedto reduce the pressure to 75 atm assuming ideal gas behavior?
  50. Chemistry

    In chemistry, for a given substance what information links mass to moles? number of particles to moles?
  51. Chemistry

    Is it possible to attach a picture to my question? I've run across a picture of a piece of chemistry equipment and I'd like to know what it is. Sheryl
  52. chemistry

    DR BOB Can you check my answer at Monday may 10 2010 at 7:12 pm at Chemistry -andy(Page 2) I think I may have got it !!! Thanks andy
  53. Chemistry

    I just took my Chemistry midterm, and would like to know how to calculate my grade on the midterm with the curve. MEAN = 8.9 STANDARD DEVIATION = 2.9 MY SCORE = 7 Thank You!
  54. chemistry

    If the gas could took a hemispherical shape, what circular surface area would the gas cover? chemistry
  55. Last chemistry post

    Can someone please reply to my previous post about chemistry preferable DrBob since he was helping me on it, but anyone is fine.
  56. chemistry

    i am doing a graph for my chemistry class, and i need help with excel. How do i plot 3.50X10^-3 into excel? it comes out as a negative number! help!
  57. Chemistry

    List the total number of each type of atoms in the following reactants. A) 2HCL + Ca(OH)2 = 6 hydrogen, 2 carbon, 2 lithium, 2 calsium, 4 oxygen B) 2Na3PO3 + 3Ca(NO3)2 This one is a bit more complicated. May any chemistry teacher show me how to do this. Thank you very much in ...
  58. Chemistry

    Chemistry - Danielle , Wednesday, February 11, 2009 at 7:24pm The density of a 22.0% by mass ethylene glycol (C2H6O2) solution in water is 1.03 g/mL. Find the molarity of the solution. Answer in M
  59. chemistry

    Products are often marketed as "organic" or "natural". What do these terms mean when applied to consumer goods? Discuss how these terms may be used to mislead a public that is not knowledgeable in chemistry. Support your opinion with references.
  60. strayer

    You and three (3) of your friends were in the same advance placement high school chemistry class in high school. All four (4) of you decided to take the same chemistry class together at the local university along with 21 other students. On the first day of class, the professor...
  61. chemistry ......chemistry

    what does Planck mean when he states that energy in quantized? Ans: plank's theory proposes that the energies absorbed or emitted by atoms are quantized ,which means that their values are restricted to certain quantities. is this O.K?
  62. Chemistry

    I'm working on chemistry homework, and I just came across a few issues I don't understand. For one, why isn't Sodium Bromide NaBr2 (Online sources show it as NaBr)? Isn't Bromine a diatomic element?
  63. Chemistry

    I did a lab in chemistry about weighing table salt and sand and mixing it with water and pouring it through a funnel. One of my lab quetions was, What are some possible sources of error in this activity? First of all, I don't know what this question means. Can anyone please ...
  64. College Chemistry

    This is my first time taking chemistry and I am VERY confused on the steps foe this problem! Kilocalories to condense 82g of steam at 100 degress C, cool the liquid and freeze it at 0 degress C.
  65. chemistry

    Moles chemistry? Calculate the mass of solute required to prepare ib the solution 200cm^3 of solution containig 0.50 mol dm ^-3 cl-iond prepared by dissolving cacl2.6h2o in water.
  66. Chemistry

    How would you scale down an organic chemistry experiment? Would you have to know an expected percent yield to scale it down?
  67. chemistry

    You have a solution of 12.0 M HCl. You need 36.5 g of hydrochloric acid for a reaction in your chemistry lab. How many mL of solution must you use?
  68. Chemistry - Forensics

    Discuss the chemistry of chemical reagents in forensics. Please be as specific and clear as possible. Thank you!
  69. Chemistry (pleas help!)

    a stressed chemistry student is hyperventilating into a paper bag. The student stops to wip his brow after a few breaths, and the bag is at 5.7 KPa and the temperature in the lecture hall is 24 degrees C. The bag is 0.75 L full. The student then goes at it again, and ...
  70. Chemistry

    I need to make a calorimeter for my high school chemistry class. Any suggestions? I have a few ideas but I can't figure out how I would light the food on fire from inside the container. I have to burn the food and measure the heat through water. thank you!!!!!
  71. Chemistry

    Look up the solubility of NaCl in both water and ethanol (in the CRC handbook of chemistry which i don't have access to, and any help would be appreciated) Consider the dissolution process, and competing intermolecular forces to account for the observed differences in solubility.
  72. Chemistry

    Look up the solubility of NaCl in both water and ethanol (in the CRC handbook of chemistry which i don't have access to, and any help would be appreciated) Consider the dissolution process, and competing intermolecular forces to account for the observed differences in solubility.
  73. Chemistry

    Hi you guys please help me with my chemistry homework, i need to find all these items and take them to my class in a ziploc bag *a hydrocarbon with a molecular mass greater than 100g/mol *2 porpanol *an aromatic compound(not the common usage of "aromatic" the chemistry use. *a...
  74. Chemistry

    N2H4+2H2O2->N2+4H2O a) If you start with 23.0 g of hydrazine and 23.0g of hydrogen peroxide, which substance is the limiting reactant? b) How much of the other chemical is left unreacted? c) Assuming 75% yield, how many grams of water are formed? I have no idea how to do ...
  75. Chemistry

    Although I do very well in chemistry I never really understood converting units. Perform each of the following conversions. A. 8.43cm to millimeters B. 2.41x10^2cm to meters C. 294.5nm to cm D. 1.445x10^4m to kilometers E. 235.3m to millimeters F. 903.3nm to micrometers
  76. Chemistry

    I need to be able to tie in acetic acid and boric acid. To decipher properties of acid-base chemistry and how they adhere to Le Chatelier’s principle. I appreciate any input....
  77. chemistry

    i am doing problems for chemistry class, and some of them are Calculating square root/ Cube Root but some are 4 and 5 instead of 2 or 3. if in a problem the exponent is 4 or 5 how would i use my calculator to calculate the root?
  78. Chemistry(Please check)

    1) The Ka for acetic acid is 1.8e-5. What is the pH of a 3.18M solution of this acid? I did 1.8e-5 = x^2/3.18 x=sqrt 1.8e-5 X 3.18 = 7.56e-3 pH=-log(7.56e-3) = 2.12 The pH is 2.12 2) At 25 degrees celsius, the pH of a 1.75M NaCN solution (the Ka for HCN is 4.0e-10) is ? 4.0e-...
  79. chemistry

    I am enrolled in analytical chemistry after a 4 year break from any chemistry. I was recently given a problem set and I need some help on the following: A 0.899g sample containing epsom salt, MgSO4 & 7 H2O, and other non-hydrated materials was dehydrated completely in a stream...
  80. chemistry

    chemistry posted by Naomi today at 8:03pm. The material Magnesium Sulfate What mass of dry material would be needed to make an aqueous solution with a molality of 4 moles/kg solution ? What mass of water is needed? 4 (24.305+ 32.065+ (4 x 15.999)) =481.5 ?Not sure where to go ...
  81. Chemistry

    Chemistry help!!!!!!!!!!!? Make a chart and define the following reactions using the following 3 examples methods. Wrie out in letter(a,b,c), Symbol(Na,Cl,O) An name form(sodium,chloride,oxygen) A direct combination b decompition C single replacement and D double replacement
  82. ENGLISH, HELP?

    In the following sentence, which words should be in quotation marks? Did you read the chapter Chemical Reactions in our science textbook, Understanding Chemistry? A. chapter Chemical Reactions B. Chemical Reactions C. Understanding Chemistry I think the answer is B, as it is a...
  83. English

    I urgently need to know where I can get a sort of dictionary of terms on microbiology. 1) I need to translate technical terms from Italian into English used to describe the results of a microbiological analysis conducted on water. 2) In addition, I need to know the English ...
  84. CHEMISTRY

    how can different steps in the analytical process help in solving probs in Analytical Chemistry
  85. Chemistry- volumn

    chemistry: 50mL HNO3 + 50.5mL HaOH = volumn?
  86. Chemistry

    Can someone please help me on this two Chemistry questions...they are from my lab....the lab was on Acids and Bases using Red Cabbage Indicator. Q1- How consistent was the cabbage juice indicator for this lab? Discuss the limitations of using red cabbage juice as an indicator ...
  87. math

    In a class of 50 student, 25 offer mathematics, 22 offer physcis, 30 offer chemistry and all the student take at least one of these subjects , 10 offer physics and mathematics, 8 offer chemistry and mathematics , 16 offer physics and chemistry. (a) draw a venn diagram to ...
  88. Math

    There are 100 students in a class. It is found that 60 students study Mathematics, 45 students study Physics and 35 students study Chemistry. Moreover, 20 students study Mathematics and Physics, 15 students study Physics and Chemistry, 25 students study Chemistry and ...
  89. Chemistry

    Chemistry - MathMate, Tuesday, March 31, 2015 at 2:56pm 1m = 1000 mm (millimeter) 1 mm = 1000 μm (micrometer) 1 μ = 1000 nm (nanometer) If the tube is 1 nm in diameter, then veryify that 5 μm = 5*1000 nm = 5000 nm = how many diameters? Chemistry - MathMate, ...
  90. 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 48.2 g by the molar mass...
  91. chemistry

    Hello, I was confused on this chemistry problem and I was wondering if someone could please help me. 1) Consider the following chemical reaction: 2CH3OH(I) + 3O2 (g) → 2CO2(g) + 4H2O(I) Calculate the number of moles of CO2 produced when 11.25 mL of methanol CH3OH(I) reacted ...
  92. Chemistry(Please help)

    Calculate the pH of an aqueous solution of 0.15 M potassium carbonate. I know that pH = -log(H30+) but I am not sure how to start this problem. Chemistry(Please help) - DrBob222, Saturday, April 14, 2012 at 11:09pm Hydrolyze the CO3^2-. CO3^- + HOH ==> HCO3^- + OH^- Do an ...
  93. chemistry

    A 1.00L sample of a gas has a mass of 1.92g at STP. What is the molar mass of the gas? (This is a question on my chemistry worksheet, and I can't find the answer in my book.)
  94. Chemistry

    If you need to make a solution of 1.0L at 2.5M citric acid and you only have 45mL of 5.0M citric acid, do you have enough for your experiment? If a mathematical procedure is involved, please explain to me; I really want to grasp this chemistry concept.
  95. chemistry

    ( from the previous chemistry question)hydration just means H2O would attach to the ions, right? would the H2O attach to the -F to form larger molecules? how does the entropy change from that?
  96. chemistry

    A student is asked to prepare 250.0 mL of 3.5 M copper (II) sulfate from solid copper (II) sulfate pentahydrate. Describe how this solution should be made in the chemistry laboratory.
  97. math

    Mrs. Gomes found that 40% of students at her high school take chemistry. She randomly surveys 12 students. What is the probability that at most 4 students have taken chemistry? Round the answer to the nearest thousandth. A)0.008 B)0.438 C)0.562 D)0.665
  98. Chemistry

    Um how do i balance these word equations for chemistry... I think I'm suppose to look them up on a common table of ions and then I don't know wat to do ferric Oxid --> iron oxygen what exactly am i suppose to do please tel me thr throught process that's suppose to go ...
  99. Chemistry

    When the equation below is balanced and all coefficients are in the lowest, whole number ratio, the coefficients are: C2H6 + O2 ¨ CO2 + H2O I am currently doing an online worksheet to improve in chemistry and I am not quite understanding how to find the coefficients and how...
  100. Experimental Chemistry

    (Experiments in synthetic chemistry) For heating under reflux, must the solvent level in the round bottomed flask be above the oil level (in the hot oil bath)? Why? Thanks.
  1. Pages:
  2. 1
  3. 2
  4. 3
  5. 4
  6. 5
  7. 6
  8. 7
  9. 8
  10. 9
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. 16
  18. 17
  19. 18
  20. 19
  21. 20
  22. 21
  23. 22
  24. 23
  25. 24
  26. 25
  27. 26
  28. 27
  29. 28
  30. 29
  31. 30
  32. 31
  33. 32
  34. 33
  35. 34
  36. 35
  37. 36
  38. 37
  39. 38
  40. 39
  41. 40
  42. 41
  43. 42
  44. 43
  45. 44
  46. 45
  47. 46
  48. 47
  49. 48
  50. 49
  51. 50
  52. 51
  53. 52
  54. 53
  55. 54
  56. 55
  57. 56
  58. 57
  59. 58
  60. 59
  61. 60
  62. 61
  63. 62
  64. 63
  65. 64
  66. 65
  67. 66
  68. 67
  69. 68
  70. 69
  71. 70
  72. 71
  73. 72
  74. 73
  75. 74
  76. 75
  77. 76
  78. 77
  79. 78
  80. 79
  81. 80
  82. 81
  83. 82
  84. 83
  85. 84
  86. 85
  87. 86
  88. 87
  89. 88
  90. 89
  91. 90
  92. 91
  93. 92
  94. 93
  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99
  101. 100