chemistry! URGENT

61,843 results, page 23
  1. CALCULUS-URGENT

    we know the series from n=0 to infinity of c(sub n)*3^n converges 1. TRUE OR FALSE the series from n=0 to infinity of c(sub n)*2^n must converge 2. TRUE OR FALSE The series from n=0 to infinity of c(sub n)*4^n must converge 3. TRUE OR FALSE the series from
  2. GEOMETRY URGENT PLEASE

    (imageshack)(.)us(/)photo (/) my-images (/)42(/)2vja. jpg(/) Open that link please , just delete the parentheses please please help me with my assignments I beg you cooperate with me huhu 1. in the figure , the areas of traingle cef, triangle abe, triangle
  3. Algebra 1- Urgent

    The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time. The price f(x), in dollars, of product A after x years is represented by the function
  4. Physics: urgent help needed

    i have a test on monday 1 A beach ball is thrown straight up with a speed of 10m/s from a point 2 m above the ground a) Assuming no air reistance, calculate how far up the ball will go b)At what speed will the ball eventually hit the ground? c) If the air
  5. Chemistry(Please respond)

    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 ==>
  6. Math urgent..............help.....

    the table below shows the registered Democrats and Rebuplicans in a school Women men Democrates 152 88 Republicans 98 122 a) find the probbility that a randomly selected person from the school is a male republican. b) find the probbility that a randomly
  7. Science (URGENT#2)

    Select any four of the physical properites listed in Table 1.1 on page 22 and use them to describe: gold, sugar, water. I don't quite understand what this question is asking. Here is the table of physical properties as mentioned. State - solid, liquid, gas
  8. chemistry

    Do you think that there is a high correlation between proficiency in mathematics and proficiency in chemistry? Explain why or why not. Use details about the components of each field to support your answer.
  9. chemistry

    what is suspension in chemistry? will you please give me a very long explanation about it now.....? I really need it for my project.plz?????? Write your own long explaination, and I will be happy to critique it.
  10. 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
  11. 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?
  12. 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
  13. Chemistry

    My question is I need to change to symbol on sodium ion, \rm Na^+, followed by the formula of a sulfate ion, \rm SO_4{}^{2-} Its my first time in chemistry class.
  14. 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.
  15. Chemistry

    Why are numbers used in chemistry often expressed in scientific notation? They otten are very large or very small. Printing those types of numbers is onerous.
  16. 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!
  17. 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
  18. 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...
  19. 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
  20. 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?
  21. 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
  22. 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.
  23. 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)
  24. 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.
  25. 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?
  26. US Gov help URGENT

    I'm very ignorant when it comes to politics. I had to write a summary on Shutdown looms: Spotlight now on Senate after Boehner wrangled House GOP votes If you go to google and type that in it's the first link.. Can someone give me some key pointers as to
  27. 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.
  28. 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
  29. 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?
  30. 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 !!
  31. 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
  32. 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.
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. Chemistry

    How is Surface catalyst(heterogeneous) and homogeneous catalyst different? I'm in 10th grade chemistry and I don't understand it.
  41. 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! (:
  42. Clinical Chemistry

    Anyone here good with clinical chemistry, particularly separation assays and high performance liquid chromatography?
  43. AP CHEMISTRY

    Someone please answer my question below in AP CHEMISTRY.
  44. chemistry

    Chemistry Suspension Examples...]
  45. chemistry

    what topics are under periodic chemistry?
  46. Chemistry

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

    Abstract 4 chemistry of starch
  48. chemistry

    Chemistry Suspension Examples...
  49. Chemistry

    What is weighted average in chemistry?
  50. CHEMISTRY

    WHAT RELATION DOES CHEMISTRY HAVE TO ART?
  51. chemistry

    which topics are under periodic chemistry II?
  52. Chemistry

    Road map in chemistry ?
  53. English

    What could be the theme of this poem? What I would like to know is the subject matter and also what could be the author's commentary on the poem. Sonnet - Silence by: Edgar Allen Poe There are some qualities- some incorporate things, That have a double
  54. 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.
  55. 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
  56. 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?
  57. 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
  58. Psychology -- I need urgent help please

    The brain produces and exchange millions of neurotransmitters every hour. I need to support this because this is what I have written in my work and a student brought that up to my attention. Can someone help help support this with a source? I have been
  59. algebra URGENT HELP

    cohol and Driving The concentration of alcohol in a person’s bloodstream is measurable. Suppose that the relative risk R of having an accident while driving a car can be modeled by the equation R = e kx where x is the percent of concentration of alcohol
  60. 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
  61. Physics Urgent!

    Please help! This is due in three hours and I don't know how to do these! 1.A block accelerates at 3.1 m/s2 down a plane inclined at an angle 24.0◦. Find μk between the block and the inclined plane. The acceleration of gravity is 9.81 m/s2 . 2.Two
  62. 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
  63. 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.
  64. 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
  65. 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
  66. 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?
  67. 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.
  68. English (URGENT) Please :'(

    I have trouble understanding of this article and how to answer the questions given. I just started new to school in Toronto; I was living in Turkey for Years So I do please to take your time to look and examine my homework. I greatly appreciate your
  69. chemistry

    If the gas could took a hemispherical shape, what circular surface area would the gas cover? chemistry
  70. 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!
  71. 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
  72. 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!
  73. Chemistry

    In chemistry, for a given substance what information links mass to moles? number of particles to moles?
  74. 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
  75. 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.
  76. 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.
  77. English

    Can you help me check these sentences, please? Thank you. I need to improve both the grammar and the vocabulary.It's urgent. 1) Claire was a sixteen-year-old girl from Texas when she met John, her future boy-friend. 2) They met each other at a friend's
  78. Science! URGENT

    How might sexual reproduction decrease an organisms chance of survival? A. If the offspring inherits a genetic combination that includes a harmful trait, it could decrease the organisms chance of survival. B. If the offspring inherits the exact sane
  79. 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.
  80. 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
  81. AP PHYSICS MECH.

    Need help urgent!!! A system consist of a ball of M2 and a uniform rod of M1 and length d. The rod is attached to a horizontal frictionless rotates at an angular speed w, as shown in the figure. The rotational inertia of the rod about point P is ? M1 d^2.
  82. Accounting urgent

    Whistle manufactures referee whistles. At the end of February, Whistle has 2,000 pounds of steel for whistles inventory. Whistle expects to produce and sell 50,000 whistles in March. Each whistle requires a standard quality of .2 lbs of steel. Whistle
  83. Counting and Probability

    Hi! I need urgent help for these questions here. They have a deadline for today and I have no idea how to solve them (a). Suppose we have a bag with 10 slips of paper in it. Eight of these have a 2 on them and the other two have a 4 on them. What is the
  84. 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
  85. Physics Urgent

    A 3.2 kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of this spring/mass sytem is 2.2 J. What is the elastic potential energy of the system when the 3.2 kg block is replaced by
  86. Accounting urgent

    Ellis Co. sold merchandise to Rather Co. on account, $7,150, terms 2/15, n/30. The cost of merchandise sold is $4,290. Ellis Co. issued a credit memo for $850 for merchandise returned and later received the amount due within the discount period. The cost
  87. Urgent! PLZZ HHEELLPP!!

    8. Which answer best describes a main benefit of the Transcontinental Railroad? A.) It proved to the world that the United States was capable of great feats of engineering B.) It created safe, high-paying jobs for immigrants who wanted to work building the
  88. 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.
  89. 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?
  90. 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.
  91. 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.
  92. 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?
  93. Chemistry - Forensics

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

    How would you scale down an organic chemistry experiment? Would you have to know an expected percent yield to scale it down?
  95. 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?
  96. English

    Could you please check these sentences,please? It's really urgent. I made some changes and I would like to know if they are correct. 1) The interior monologue has the following features. First, it is immediate since it lacks the conventional syntax and it
  97. 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
  98. PHYSICS - urgent

    assuming there's no friction of, if two balls (one heavier than the other) are held up the same distance from the ground; the heavier ball will have more G.P.E than the lighter one, n when both are dropped, all the G.P.E can only change to K.E, as there's
  99. 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
  100. 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