59,293 results, page 2

  1. chemistry

    Im brenda,n i found its hard copng in dng grd 11,n i wish 2 hv sm1 wo wil help m cope.tnx
  2. chemistry

    Hi I am in AP Chemistry and I did not take regulars chem so I have never done labs before and was wondering If anyone could give me examples on how to do a lab
  3. Chemistry

    For my Chemistry question it's about herbicide's What do they do? what are they intended for? what risk's do they pose in our society? how are they created? if anyone could answer these please thanks you!
  4. Chemistry

    describe how you would prepare 250.0 mL of a .500 M solution of NaCl by using apparatus found in a chemistry lab.
  5. Chemistry! HELP

    A chemistry student used the symbol "sx" to represent an s orbital that lies along the x-axis. Is this reasonable. Justify your answer.
  6. Chemistry

    What is the chemistry behind the ASA – FeCl3 reaction?
  7. Chemistry

    What is the chemistry behind the ASA – FeCl3 reaction?
  8. chemistry

    how do you add ph values of neutrals and bases in chemistry?
  9. Chemistry --- chemistry ---

    what is the difference between an atom and an ion ???
  10. chemistry .....chemistry

    what element include in the fireworks power ? why
  11. chemistry

    What is an open and closed sytem refer to in chemistry? thanks!
  12. ap chemistry

  13. Chemistry

    Could anyone give a web about 1.Practical arts 2.Greek theory 3.Alchemy 4.Plogiston 5.Modern Chemistry Thanks:-) Duplicate post.
  14. Y9 chemistry

    I need to answer a few questions fo my chemistry homework- 1.Why does the mass of copper sulphate decrease as a result of being heated?
  15. Chemistry

    Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
  16. Chemistry

    Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Thank you
  17. Chemistry

    Does anyone know a website with practice problems (and answers) regarding quantitative chemistry? I haven't been able to find anything on Google.
  18. chemistry

    According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water? a- PbCl2 b- RbCl c- LiCl d- FeCl2
  19. Chemistry

    According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water? a- PbCl2 b- RbCl c- LiCl d- FeCl2
  20. chemistry

    According to Solubility guidelines chemistry reference table, which of these salts is least soluble in water? a- PbCl2 b- RbCl c- LiCl d- FeCl2
  21. Chemistry

    I need to know how chemistry relates to sepsis (an infection where anitgens invade the red blood cells i think) I cant find any web sites to help me
  22. chemistry

    so all i do is add 273.15 to the temperature in celsius( sorry about the typo. i no i spelled chemistry wrong too)and then multiply/divide everything?
  23. Chemistry

    What is the highest number of bonds that one Carbon atom can make? 4 3 2 1 I'm thinking four but I probably am wrong-I'm not great at chemistry but I'm trying Thank you
  24. chemistry

    What is the chemistry behind the “Breathalyzer” test. I'm supposed to explain the chemicals and structures involved with the reactions which produce the positive and negative results
  25. CHemistry

    For the reaction 2 Na + 2 H2O -------> 2 NaOH + H2, how many grams of hydrogen gas are produced when 133.6 g of water are reacted? I am soooo confused in chemistry. Please help.
  26. chemistry help

    this isnt exactly a chemistry question, but i am doing chemistry homework with my calculator. and i want to know if someone can tell me how can i cube something with this calculator? TI-30X IIS? i wanted to post a pic but i cant post sites. i have this calculator can you tell ...
  27. Chemistry

    I need to perform a chemical demonstration on thermochemistry or kinetics or colligative properties for chemistry class. However I cannot have demonstrations involving fire.
  28. Chemistry

    Can anyone help me with some topics to write about on what chemistry has to do with mechanical engineering. Anyone's help would be appreciated because I really need to finish this 10 page research paper.
  29. Chemistry

    How does understanding chemistry help us in todays world
  30. Chemistry

    Sorry, just asking a question on chemistry.

  32. chemistry

    Does Chemistry have anything to do with meteorology?
  33. chemistry

    how does space exploration involve chemistry

    i added info in the last question in AP CHEMISTRY
  35. chemistry

    what is chromatography? Its history,purpose in chemistry.
  36. Chemistry

    How do I write a blog for my chemistry project?
  37. chemistry

    which topics are under periodic chemistry II?
  38. chemistry

    what topics are under periodic chemistry?
  39. Chemistry

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

    how does chemistry apply to everday life?
  41. As chemistry

    A SAMPLE OF ANTIMONY, Ar=121.8, WAS ANALYSED AND WAS FOUND TO CONSIST OF 60% OF 121Sb AND ONE OTHER ISOTOPE. DETERMINE THE MASS NUMBER OF THE OTHER ISOTOPE IN THE SAMPLE OF ANTIMONY. please help I'm really stuck, Chemistry - bobpursley Saturday, September 30, 2017 at 10:41am ...
  42. math

    A school has 63 students studying Physics, Chemistry and Biology. 33 study Physics, 25 Chemistry and 26 Biology. 10 study Physics and Chemistry, 9 study Biology and Chemistry while 8 study both Physics and Biology. Equal numbers study all three subjects as those who learn none...
  43. Math

    In a class of 100 students, 40 offer Biology and 10 offer Chemistry and Biology .10 offer Physics and Chemistry , and 30 offer Physic and Biology . Each student offer at least one of the three subjects. The number of students who offer Biology is equal to those who offer ...
  44. AP Chemistry

    Hey I have the AP Chem test coming up and i was wondering where I could find the answer key to some of the AP Chemistry tests like 1994, 1999, and 2002 MC and FR
  45. Chemistry

    Why does the reaction of 2-bromo-2-methylbutane and ethanolic solution of silver nitrate interfered by the presence of water in the sodium iodide in acetone reagent? (Substitution chemistry) Thanks for any help!!
  46. Chemistry

    Use the data in Table 15.3 (in the book Chemistry after Raymond Chang) to calculate the equilibrium constant for the following reaction: HCOOH(aq) + OH-(aq)= HCOO-(aq) + H2O(l)
  47. Chemistry

    Hello. On the homework for my middle school chemistry class, one of the questions asks me to identify "the four classifications of substances". I am having difficulties with this problem.
  48. chemistry

    Posted by Bret on Friday, March 16, 2007 at 10:44am. what is the oxidation number for nitrogen in the following? NH3 NO2 1- N2 NO2Cl N2H4 For Further Reading chemistry - bobpursley, Friday, March 16, 2007 at 11:26am We will be happy to critique your thinking or work. chemistry...
  49. chemistry

    What are some applications of Nuclear Chemistry in Medicine? So far I've found - X-rays - Radioactive tracers - Gamma radiation can be used to treat cancer and other diseases
  50. Chemistry

    Could someone please direct me to a website that explains why acid-base titration is a useful technique in chemistry. Or offer your own opinions. Thanks ahead of time for any input!
  51. Chemistry

    Please help-I need to give at least three examples of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. Any help would be greatly appreciated-I'm desperate Thank you
  52. chemistry

    Can someone help me with Chemistry Homework Due Tomorrow, Its about the Electrolysis of Hydrochloric Acid Practical we did and I Have to write a summary and I don't get what we did Y10 GCSE Higher Tier
  53. Chemistry

    A principle of green chemistry is that the energy requirement of industrial processes should have minimal environmental impact. How can the use of catalysts lead to "greener" technology?
  54. Chemistry

    I am having trouble on a chemistry question for my study guide I have researched it and can't get an answer I understand can someone please help me? Describe what happened when an Ag+ combined with Na2CO3. What does this indicate?
  55. Chemistry

    The population of San Francisco is 750,000 in an area of 49 square miles. What is the population density in San Francisco? Express your answer in people per acre. ( 1mi(squared) = 640 acres ) 49 sq mi x (640 acres/1 sq mi) =?? acres. (Note that sq mi cancels leaving acres.) ...
  56. Chemistry

    Assuming that the smallest measurable wavelength in an experiment is 0.330 fm(femtometers), what is the maximum mass of an object traveling at 157 m·s^–1 for which the de Broglie wavelength is observable? mass = ? kg Chemistry - DrBob222, Monday, October 29, 2012 at 12:29am...
  57. Chemistry

    Assuming that the smallest measurable wavelength in an experiment is 0.330 fm(femtometers), what is the maximum mass of an object traveling at 157 m·s^–1 for which the de Broglie wavelength is observable? mass = ? kg Chemistry - DrBob222, Monday, October 29, 2012 at 12:29am...
  58. Chemistry

    I'm having alot of trouble in chemistry. Currently were studying chemical equations and reactions. I would like to know if this is a single or double replacement reaction. 2Li + H2O ---> 2LiOH + H2
  59. Chemistry

    For the reaction below 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) calculate Srxn at 298 K. (Hint: Use a table of thermodynamic data commonly found at the back of chemistry textbooks.)
  60. Chemistry

    Stuck on this because I haven't done chemistry in a while. Can someone guide me through it or help me out? Balance the reduction-oxidation chemical equation in base: MnO4- + HSO3- -> MnO2 + SO4^ 2-
  61. chemistry

    Why does a titrated sample that is fuschia with phenolphthalein turn colorless when the solution is blown into? HINT: Use chemistry and properly balanced chemical equations to support your statement.
  62. Chemistry

    sorry i will rephrase the question. what is the chemistry behind these elements to give them these qualities and make them react the way they do with like water and such. 1)magnesium 2)calcium 3)potassium 4)sodium
  63. Chemistry(Please help)

    What is the pH of a 5.06E-2 M aqueous solution of sodium acetate? I know that I would set this up the same way I did for the previous question that I posted. I am just confused on how to find the Ka. I know it is kw/kb but for what compound is what I do not know. Chemistry(...
  64. ACT Math

    Of the 60 students in a school, 24 are currently studying chemistry. Exactly 16 of the girls in the school are not currently studying chemistry. The number of girls in the school is 33. How many boys are currently studying chemistry? Correct answer is 17. How did they get that...
  65. chemistry

    Please, can someone help? Evaluate log 1. This is my work up until I have gotten stuck: log 1 1=10^x I can't find a common base for 1 and 10^x. Wow, my apologies, this is algebra, not chemistry. but actually I think they use it in chemistry too... Take the log base 10 of each ...
  66. math

    In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also,4 of them offer physics and chemistry but not biology,3 offer physic and biology but not chemistry,6 offer biology and chemistry but not physics if 13 of them offer physics only how...
  67. chemistry

    (Re-posting because no one was answering chemistry questions) if you have 100mL of 0.1M acetic acid (ka = 1.8x10(-5)what is the pH after 10mL NaOH is added? I came up with an answer of 2.895, but i'm not sure if its right.
  68. 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.
  69. 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
  70. 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
  71. To all chemistry students

    Please understand that one of our chemistry tutors is on vacation this week. Please be patient.
  72. 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?
  73. chemistry

    If 35.0 g H2O at 22.7 °C is combined with 65.0 g H2O at 87.5 °C, what is the final temperature of the mixture? The specific heat capacity of water is 4.184 J/g×K. Chemistry
  74. Clinical Chemistry

    Anyone here good with clinical chemistry, particularly separation assays and high performance liquid chromatography?
  75. 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?
  76. 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.
  77. 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!
  78. 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! (:
  79. 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
  80. Chemistry AP

    This isn't quite an HW question, I'm needing any site that gives practice Free Response problems for equilibrium for AP Chemistry if there are any for study and practice.
  81. chemistry

    If the gas could took a hemispherical shape, what circular surface area would the gas cover? chemistry
  82. 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?
  83. 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!
  84. 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
  85. 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?
  86. Chemistry Help - Check Please

    1) Describe 4 processes/forces that can explain all mechanism in Organic Chemistry? My answers: a) Electron Delocalization b) Hydrogen Bonding c) Aromacity d) Nucleophilic Substitution (SN1 & SN2) Thank you!
  87. Chemistry

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

    Discuss the chemistry of chemical reagents in forensics. Please be as specific and clear as possible. Thank you!
  89. Chemistry

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

    Chemistry Suspension Examples...]
  91. chemistry

    Chemistry Suspension Examples...
  92. Chemistry

    What is weighted average in chemistry?
  93. chemistry

    i need help with chemistry homework
  94. chemistry

    Abstract 4 chemistry of starch
  95. Chemistry

    What is another name for mole in Chemistry
  96. chemistry

    What does a slash (/) mean in chemistry?
  97. Chemistry

    Road map in chemistry ?
  98. Chemistry

    I'm doing a Chemistry project on the element Potassium. I need some sort of color theme to apply to my project because creativity counts. Does anyone have suggestions?
  99. Chemistry

    What effect would a sweaty person have on the pool chemistry? Would the reaction tend to be forced to the right or to the left? Any help is greatly appreciated!
  100. 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.
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