1. CHEM

    How do I work the following question? I found the amu of CaCO3=101.0872g/mol; 2HCL=72.92128g/mol; H2O=18.1582g/mol;CO2=44.0098g/mol; and, CaCl2=110.9834g/mol. You carefully weigh out 10.00g of powder and add it to 40.50g of solution. You notice bubbles as

    asked by d on October 1, 2007
  2. Algebra-please check my answers

    Solve the equation by expressing each side as a power of the same base and then equating exponents. 9^(x - 9)/8= sqrt of 9 i got 13 4^(x + 10) = 8^(x - 6) i got 38 Solve the exponential equation. Express the solution set in terms of natural logarithms.

    asked by Ang on October 26, 2007
  3. chemistry

    What is the solubility of AgCl when it is in a solution of 0.15 M NaCl? (AgCl has Ksp = 1.8 x 10-10.) Make a reaction table. Include rows for initial concentration, change in concentration, and equilibrium concentration. Write down the equation for the Ksp

    asked by Anonymous on May 4, 2012
  4. AP Chem

    A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 458-mg sample of the barium compound if a solution of the sample

    asked by Anna on November 3, 2008
  5. chemistry

    What is the solubility of AgCl when it is in a solution of 0.15 M NaCl? (AgCl has Ksp = 1.8 x 10-10.) Make a reaction table. Include rows for initial concentration, change in concentration, and equilibrium concentration. Write down the equation for the Ksp

    asked by Anonymous on April 23, 2012
  6. Probability and Statistics

    For question 1, here's the numbers you use: {20, 18, 17, 19, 22, 29, 16, 27, 24}. 1. Calculate the 50th percentile. For questions 2 and 3 use this number line: {16, 17, 18, 19, 20, 22, 24, 27, 29, 80} 2. Calculate the z-score for the 80 & explain what it

    asked by Amber on January 4, 2013
  7. physics

    Again, I know I keep posting questions but I'm begging you for help. At 25°C the vapour pressure of pure pentane is 511 torr and that of hexane is 150. torr. What is the mole fraction of pentane in a pentane-hexane solution that has a vapour pressure of

    asked by anonymous on April 11, 2012
  8. Social Studies

    Well- this is kind of social studies...so anyway, I have to do a presentation on automobiles and I wanted to know some problems with automobiles in the 1920's? I already have: The automobiles scared horses because they were so noisy, people drove there

    asked by Anonymous on November 19, 2015
  9. Science

    If I want to make a solution that has a 5% concentration of salt, is it correct for me to have 380mL water and 20g salt? My method behind this was that I wanted a 400g solution, and so since 1mL water is equal to 1g water, I did: 400x0.95=380g water or

    asked by Anonymous on February 6, 2011
  10. I would like to understand my calc homework:/

    Consider the differential equation given by dy/dx=(xy)/(2) A) sketch a slope field (I already did this) B) let f be the function that satisfies the given fifferential equation for the tangent line to the curve y=f(x) through the point (1,1). Then use your

    asked by Amber on March 27, 2013
  11. Chemistry

    A 1.00 g sample of enriched water, a mixture of H2O and D2O, reacted completely with Cl2 to give a mixture of HCl and DCl. The HCl and DCl were then dissolved in pure H2O to make a 1.00 L solution. A 25.00 mL sample of the 1.00 L solution was reacted with

    asked by Adam on September 21, 2012
  12. CHEMISTRY

    a concentration-time study of the gas phase reaction a 2A3 -> 3A2 produced the data in the table below. time [A3] (M) [A2] (M) 0 4.00 *10^-4 0 10 2.00 *10^-4 3.00 *10^-4 20 1.00 *10^-4 4.50 *10^-4 10 5.00 *10^-5 ? A) What is the concentration of A2 in the

    asked by chantel on September 4, 2014
  13. Biochem

    What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? Condition: A cell-free yeast extract is placed in a solution that contains 3.50 × 102 mmol glucose, 0.30 mmol ADP, 0.30 mmol Pi,

    asked by Mark on April 3, 2013
  14. geometry

    I would love for someone to check my work on the seven problems that I did. I would be eternally grateful. I am going to list my problems and answers. Even if you only want to check one of them, that would be great. 1. Write an equation of a line in point

    asked by Savannah on August 2, 2015
  15. United states history

    What similarities do you see between the United States today and the United States of the past? What issues and problems do we continue to grapple with? What successes do we share with Americans in the past? I want to find something now in united states

    asked by Selena on December 8, 2014
  16. health

    In the field of health care administration, why is it important that everyone within the facility use medical terminology correctly? How can using correct medical terminology improve patient outcomes and services within the facility? What could be some

    asked by Taylor mcBride on April 17, 2012
  17. AP Chemistry

    A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH a. Does the solution contain a strong acid with a strong base, a strong acid with a weak base, a weak acid with a strong base, or a weak acid with a weak

    asked by jesse on March 23, 2016
  18. chemistry

    A solution is made by adding 0.100 mole of ethyl ether to 0.841 mole of ethyl alcohol. If the vapor pressure of ethyl ether and ethyl alcohol at 20oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20oC (assuming ideal

    asked by renee on February 22, 2012
  19. chemistry

    A solution is made by adding 0.100 mole of ethyl ether to 0.841 mole of ethyl alcohol. If the vapor pressure of ethyl ether and ethyl alcohol at 20oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20oC (assuming ideal

    asked by renee on February 22, 2012
  20. Chemistry

    A titration involves titrating 0.4 M NaOH into a solution of 0.2 M H3PO4. a.) Calculate the volume of NaOH that will be required to reach the first equivalence point. b.) Calculate the volume of NaOH required to reach the second equivalence point. Other

    asked by Anonymous on February 8, 2014
  21. AP Chemistry

    A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH a. Does the solution contain a strong acid with a strong base, a strong acid with a weak base, a weak acid with a strong base, or a weak acid with a weak

    asked by Anonymous on March 23, 2016
  22. Analytical Chemistry

    A 22.617 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 70.407 g of water. A 10.883 g aliquot of this solution is then titrated with 0.1072 M HCl. It required 29.32 mL of the HCl solution to reach

    asked by Sam on February 28, 2013
  23. Chemistry

    A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be M. What permits this assumption? A. The

    asked by Neil on June 20, 2011
  24. Chemsitry

    Check my work? What is the approximate pH of a 0.05 M solution of HSCN that has a Ka of 10-4? HSCN -> H+ + SCN- --------------------------- The equation for calculating pH is pH = -log [H+] Now we need to find H+ and solve. [HSCN] = 0.05 M the molarity Ka

    asked by Aurora on May 13, 2016
  25. math

    What does it mean to have two matrix variables written vertically inside parentheses? In other words, if A and B are matrices, what does this mean (imagine there is one set of parentheses spanning both rows): (A) (B) I'm trying to understand a least

    asked by sergei on January 7, 2009
  26. 6th grade math

    Having problems with surface area of a triangular prism. I know the formula is ab + (S1 + S2 + S2)h, however I can't tell what all 3 sides of the trianle are from the picture. The triangular face shows a height of 50 in and a base of 20 in. No other

    asked by Brandi on November 29, 2012
  27. ancient mariner

    Do you think the ancient mariner is a romantic poem? I am having problems trying to figure out why it isnt'. thanks This site will give you the era and definition of poetry from the Romantic era. After reading it, you will be able to see where The Rime of

    asked by casey on February 28, 2007
  28. Pre-calculus

    I am having difficulty with two problems: 1) Evaluate (1+i)^12 by using DeMoivre's Theorem. Express the result in rectangular form. So far I have: r=sqrt(1)^2+(1)^2 which simplified is sqrt2. Don't know how to proceed. 2) Write the polar equation theta =

    asked by Lucy on September 30, 2008
  29. math 098

    I made 3 f's on my tests in math 098, do you think i need to withdraw and take math 090 instead. this is my first semester and i really want to do my best please help. math 098 is algebra math 090 is basic for college. the score were equations--52,distance

    asked by %%%Rena%%% on July 6, 2012
  30. SIGN LANGUAGE PLEASE HELP WITH SENTENCE STRUCTURE!

    Hi, I am having problems with the structures of sentences in sign language. Can you please put each of these sentences in sign language sentence structure? What will the weather be like today? The sun will be out, and it will be windy. I thought it was

    asked by LeXi<3 on April 4, 2012
  31. Physics

    Calculate the formula for coefficient of kinetic friction in an inclined plane with a pulley and two masses coonected by a rope. You can only use the weight of the two masses, the height where the second object is and the distance that the first object

    asked by Nelson on June 29, 2016
  32. Sign Language

    Hi, I am having problems with the structures of sentences in sign language. Can you please put each of these sentences in sign language sentence structure? What will the weather be like today? The sun will be out, and it will be windy. I thought it was

    asked by LeXi<3 on April 4, 2012
  33. Chemistry

    Xenon of mass 5.08 g reacts with fluorine to form 9.49 g of a xenon fluoride. What is the empirical formula of this compound? A) XeF6 B) XeF4 C) XeF2 D) XeF E) Xe2F I am not familiar with these types of empirical formula problems. If I'm given the

    asked by Olivia on March 23, 2009
  34. Chemistry

    Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 degrees celcius ? The freezing point for pure water is 0.0 degrees celcius and Kf is equal to 1.86 degrees

    asked by Nikita on January 16, 2011
  35. Algebra

    I have a few problems I need some help with. The first is Evaluate the sum. 1. There is an E like symbol on the top is 10 on the bottom n=1 and to the right (7-2n) 2. The next question is find a10 for an arithmetic sequence with a1=6 and d=10 3. Find the

    asked by Jess on April 3, 2013
  36. Math

    Alyssa is doing a card trick with one of her friends, Denise. She only uses 15 cards: 3 diamonds, 3 hearts, 4 spades, and 5 clubs. Denise draws one card, replaces it in the deck, and draws one card again. What is the probability that she draws a heart both

    asked by Sanzi on February 19, 2014
  37. Math

    I have 2 problems that I just need to know if they are right 1. Add, Simplify if possible 3/14w + 11/49w Answer that I got was 21+22/98w 2. Add, simplify if possible 9b/3b-9 + 6b/9b-27 I am not sure about this one I got two answers 81b+6b/34b-108 or

    asked by Anonymous on October 18, 2009
  38. 5th grade math

    My daughter must correct the problems that she has gotten wrong in math, and we are trying to help her. I can not remeber how to write decimals in exponential form, and I tried looking in her book. Can some one help me so that I can help my daughter.

    asked by Alicia on October 15, 2008
  39. help with my science test 7th grade connection

    11. Several studies link cigarette smoke to health problems have resulted in the banning of smoking in many public places.this is an example of A.ways scientific theories become scientific laws. B.ways a scientists communicate results C.ways science

    asked by Angle on September 15, 2017
  40. MATH!!

    (1)At the begining of her math class, Mrs. Reno gives a warm-up problem. She says, "I am thinking of a number such that 6 is less than the product of 7 and this number is 85." Which number is she thinking of? A-11 B-84 C-13 D-637

    asked by megan on March 11, 2007
  41. Statistics

    Can someone please help me with this example, I do not understand it at all. Binomial problems: Advanced A machine that manufactures automobile parts is estimated to produce defective parts % of the time. If this estimate is correct, and parts produced by

    asked by Christi on May 26, 2010
  42. Chemistry

    A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac

    asked by Mike on November 14, 2011
  43. chemistry

    A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac

    asked by Mike on November 14, 2011
  44. business

    i have a problem with this question my teacher gave me. i don't know what to write for the answer. the problem: there is a girl named Jane who is hired as the head of the payroll department at R& S Electronic company, firm of 75 employees. she is hired by

    asked by jack smith on August 22, 2011
  45. Chemistry Equation

    In a lab expirement you add copper(II)nitrate to pure zinc. Write a balanced equation for this expirement and predict if a reaction will occur. I THINK Bob Pursley answered this question a day or so ago. Zinc is higher in the activity series than copper;

    asked by chrissy on January 6, 2007
  46. chemistry

    A 1.00-g sample of piperazine hexahydrate is dissolved in enough water to produce 100.0 mL of solution and is titrated with 0.500 M HCl. What is the initial of the solution, before any titrant is added? Piperazine,HN(C4H8)NH, is a diprotic weak base used

    asked by shae on March 30, 2011
  47. Chemistry

    Calculate the enthalpy change (ΔH) for: HCl(aq) + NH3(aq) → NH4Cl(aq) The reaction of 50.0 mL of 1.00 M HCl with 50.0 mL of 1.00 M NH3 causes a temperature rise of 6.4 ˚C in the resulting 100.0 mL of solution. The NH4Cl solution has a density of 1.005

    asked by Jim on September 15, 2015
  48. Chemistry

    Oxalic acid, found in the leaves of rhubarb and other plants, is a diprotic acid. H2C2O4 + H2O ↔ H3O+ + HC2O4- Ka1= ? HC2O4- + H2O ↔ H3O+ + C2O42- Ka2 = ? An aqueous solution that is 1.05 M H2C2O4 has pH = 0.67. The free oxalate ion concentration in

    asked by Ashley on November 15, 2016
  49. chemistry

    A student needs to make a dilution from a stock solution. The stock solution is 2.) M NaCl. How much should the student use of the 2.0 M NaCl to make 1.0 L of 0.05M NaCl diluted stock.

    asked by Marilyn on April 6, 2011
  50. World History

    Which of the following was the major reason Philip II and Louis XIV patronizing the arts? a. They desired to show their great power through the splendor of their royal courts.*** b. They sought to distract their subjects from continuing economic problems.

    asked by Olivia N J on February 1, 2017
  51. English

    I left out the following statements. Thank you. 1) Investigation activities will be based on four components: investigation (analyzing problems from different points of view), interaction (activities and skills) and interpretation (presentation of findings

    asked by Henry2 on January 28, 2012
  52. Social studies NEED HELP

    which of the following were problems faced by the english colonist at jamestown? The colony employed many indentured servants and paying them was different •• They Settled in an insecure location and were vulnerable to Spanish attack The location of

    asked by Cassidy Ziegler on September 23, 2016
  53. AP Chemistry

    Hey guys! Stuck on some problems: 1)Consider the following chemical reaction between gases: 2N2O(g) + O2(g)->4NO(g) + heat The amount of O2 at equilibrium will be decreased by: 1. Adding more NO(g). 2. Increasing the pressure by decreasing the volume. 3.

    asked by Allie on October 8, 2015
  54. Pre.Calc

    You want to make an investment in a continuously compounding account over a period of ten years. What interest rate is required for your investment to double in that time period? Round the logarithm value to the nearest hundredth and the answer to the

    asked by Julissa on March 14, 2015
  55. English

    I've had problems in the past with MLA format as far as writing and I was wondering what was wrong with this work cited entry... Kenyone, Jane. "Let Evening Come." Collected Poems. St. Paul, Minnesota: Graywolf Press. 1990. The Collected Poems is

    asked by Vesone on April 17, 2007
  56. 8th grade math

    i have two problems that i need to write an inequality for. a) One third of a number, decreased by thirty six, is at most twenty two. Find the number. b) A school's Spanish club is welling bumper stickers. They bought 100 for $55, and have to give 15 cents

    asked by saranghae12 on February 28, 2012
  57. Biology

    I am doing a lab on Dialysis to check if starch moves through the differentially permeable membrane of dialysis tubing.We did this by placing a dialysis tube filled with starch solution into a beaker filled with distilled water and a few drops of iodine. I

    asked by Audrina on February 18, 2009
  58. chemistry

    Malic acid is a weak diprotic organic acid with K1 = 4.0x 10-4 and K2 = 9.0 x 10-6. (a) Letting the symbol H2A represent malic acid, write the chemical equations that represent K1 and K2 . Write the chemical equation that represents K] xK2 . (b)

    asked by pinky on December 15, 2014
  59. Chemistry

    A sample of CuSO4*5H2O was heated to 110 degrees C, where it lost water and gave another hydrate of copper (II) ion that contains 32.50% Cu. A 98.77-mg sample of this new hydrate gave 116.66 mg or barium sulfate precipitate when treated with barium nitrate

    asked by Help Please!!!!!! on June 11, 2009
  60. Chemistry

    What is the mole fraction of methyl n-butyrate CH3(Ch2)2COOCH3 in the vapor phase of a solution consisting of? a mixture of methyl n-butyrate and ethyl acetate CH3COOCH2CH3 at 50 Celsius if the total pressure above the solution is 192.5 torr. The vapor

    asked by Jude on February 20, 2011
  61. chemisrty

    i don't get how to do molar conversions? I hope this helps. 1.) Go to google. 2.) Type in molar conversions 3.) Click on the first link. This link has examples and the answers to the practice problems. To get better at these. Remember to keep practicing.

    asked by gabby on January 4, 2007
  62. CHEMISTRY> HELP QUICK! pls

    what is the pH of a 2.62x10^-1 M NaNO2 solution? NB the pKa for HCN=9.212 12.13 13.42 1.87 8.29 0.58 and also; what is the pH of a 2.62x10^-1 M HCN solution. NB the pKa forn HCN is 9.212. 4.90 9.21 0.58 11.32 13.42

    asked by Lucinda on June 1, 2010
  63. college chemistry

    A) In some regions of the southwest United States, the water is very hard. For example, in Las Cruces, New Mexico, the tap water contains about 560 ug of dissolved solids per milliliter. Reverse osmosis units are marketed in this area of soften water. A

    asked by Stephanie on April 28, 2010
  64. chem. stuff+5

    9. The reaction 2 H2O(l)>>>O2(g) + 2 H2(g) requires 2.06 V, but the reaction 2 H2O(l) + 2 Cl –(aq)>>> H2(g) + 2 OH –(aq) + Cl2(g) requires 2.19 V. If a 1.0 mol/L solution of aqueous NaCl is electrolyzed, what voltage should be applied to get O2(g), but

    asked by hey u!! on June 17, 2006
  65. World History

    Which of the following best explains how the alliance system contributed to the outbreak of World War I? A. Alliances had limited trade, causing economic problems and spurring unrest. B. Rival alliances had promoted tension rather than security. C.

    asked by June on March 15, 2017
  66. Biology

    1)Which of the following is NOT a true property of water? A-Water is a good solvent dissolving a wide variety of substances. B-Water has a high ice density allowing ice to sink when present with liquid water. C-Water has strong cohesion allowing it to bead

    asked by HELP ME on January 28, 2019
  67. Chemistry

    I am about to do an extraction experiment, and needed help with a question to improve my understanding. Any help appreciated. 1. You have 150 ml of a solution of benzoic acid in water estimated to contain about 5g of the acid. The distribution coeffcient

    asked by Natasha on March 12, 2010
  68. life orientation

    Describe a recent service delivery protest in your community or in the neighbourhood .what are the problems that did the community members do before the protest ? What did the community members do before the protest was conducted by the ccommunity and what

    asked by nkule on May 19, 2019
  69. alg 1

    Quadratic graphs and their properties: Identify the domain and range of each function: y = 4x^2 - 3 I have no idea how to find the range and domain. Would you please explain in detail how I can determine the domain and range in the quadratic problems?

    asked by Jane on April 4, 2013
  70. Civics

    Under the Articles of Confederation, there was no separate judicial branch. Which of the following problems did this create? A. Judges could not make any rulings on cases involving the state. B. People had nowhere to go if they had a dispute with the

    asked by The dancing potato on September 28, 2018
  71. Calculus (pleas help!)

    Consider the function f(x)=12x^5+60x^4−100x^3+4. For this function there are four important intervals: (−INF,A], [A,B] ,[B,C] , and [C,INF) where A, B, and C are the critical numbers. Find A, B, and C. At each critical number A, B, and C does f(x) have

    asked by Karku on March 31, 2011
  72. science

    Standing on a scale on an elevator is a man of mass 140kg. a) what is the reading of the scale if the elevator moves up at 5 m/s. b) moves down at 5m/s c) accelerated up at 2m/s^2 d) accelerates down at 2m/s^2? for a) and b) would I use N=m(g+a) but when I

    asked by Jenny on November 20, 2006
  73. physics

    Im trying to study for my physics exam by doing some extra problems, however im stuck with this one. any help is much appreciated Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 4.62 x 10-6 kg. The

    asked by John on September 28, 2012
  74. Social studies

    Which of the following do the conflicts in both Darfur and Rwanda illustrate? A. The environmental issues many African nations are experiencing. B. The problems some African nations are facing as a result of colonialism. C. The economic prosperity certain

    asked by Lyn on March 13, 2019
  75. math

    Let f(t) = Q0at = Q0(1 + r)t. f(7) = 75.94 and f(9) = 91.89 (a) Find the base, a. (Round your answer to two decimal place.) a = I honestly have no idea how to approach these problems. I wrote out the different equations: 75.94 = Q0a^7 and 91.89 = Q0a^9 but

    asked by Stella on August 30, 2015
  76. Physics

    Oxygen (O2) has a molar mass of 32.0 g/mol [.032kg/mol]. What is the root-mean-square speed of an oxygen molecule at a temperature of 310 K? Vrms=492 m/s What is its average translational kinetic energy at that speed? Kav= ?? J I am having problems with

    asked by Christina on December 9, 2007
  77. chemistry

    The pH of a solution prepared by mixing 45 mL of 0.183 M KOH and 65 mL of 0.145 M HCl is i solved it but my answer is wrong. the right one is 1.97. am i missing a step? moles of HCl left over = (moles of HCl) – ( moles of KOH) moles of HCl left over =

    asked by ben on November 23, 2010
  78. Problem Solving Math Question

    Find the sum of all the numbers in the following array: 1 2 3 4 5 6........100 2 4 6 8 10 12 ......200 3 6 9 12 15 18 ......300 . . . 100 200 300 400 500 600 . . . 100(x)100 Can anyone help me?? I'll suggest how to solve this, but you'll need to do the

    asked by Krisy on August 27, 2006
  79. Chemistry

    Q1: You wish to prepare a buffer solution with pH = 11.10. What volume of 6.0 M HCl would you add to 500 mL of 0.10 M (C2H5)2NH to prepare the buffer? You may assume that the solution’s volume remains constant. Q2: What is the resulting pH when 20 mL of

    asked by David on February 24, 2013
  80. Chemistry

    Q1: You wish to prepare a buffer solution with pH = 11.10. What volume of 6.0 M HCl would you add to 500 mL of 0.10 M (C2H5)2NH to prepare the buffer? You may assume that the solution’s volume remains constant. Q2: What is the resulting pH when 20 mL of

    asked by Anonymous on February 24, 2013
  81. Chemistry

    Express the following in mol/kg [H+]in a water with a pH of 6.8? Ok, so the pH=-log10[H+]. Here we have a pH of 6.8 so we have... 6.8=-10log10[H+] solving we get... [H+]=10^-6.8 mol/L converting from Liters to m^3 and dividing by the density of water we

    asked by Jan on January 20, 2007
  82. chemistry

    (b) (i)The e.m.f. of the cell was measured as 0.62 volts. Taking the standard electrode potential of Cu/Cu2+ as = +0.34 volts, calculate the standard potential of the Co/Co2+ system. Be careful to indicate whether your answer is positive or negative. (ii)

    asked by bby on April 10, 2017
  83. Chemistry

    Consider the following reaction: PbCl2 + 2 NaOH -> Pb(OH)2 + 2 NaCl What would be the major species observed floating in solution after one mole of PbCl2 and 2 moles of NaOH are mixed in aqueous solution? 1. Na+ ions, Cl− ions and H+ ions 2. Pb2+ ions,

    asked by Cher on April 5, 2010
  84. AP Chemistry

    Consider the following reaction: PbCl2 + 2 NaOH → Pb(OH)2 + 2 NaCl What would be the major species observed floating in solution after one mole of PbCl2 and 2 moles of NaOH are mixed in aqueous solution? 1. Na+ ions, Cl− ions and H+ ions 2. Pb2+ ions,

    asked by Sam on April 18, 2016
  85. Com/220

    Hello I am stuck on trying to figure out my assignment on Incorporating Statistics, Graphs, and Illustrations. My topic I chose was on Education and I am not having any luck finding any pictures, graph's or anything on this topic that I can use. Is there

    asked by Nikki on June 3, 2010
  86. CHEMISTRY- PLEASE HELP:)!

    Pure lauric acid is melted and the freezing point is determined to be 43 degrees celsius. A solution is made by dissolving .50 grams of paradicholrobenzene into 3.00 grams of lauric acid. Determine the molality of this solution. I got 1.1m. which is right.

    asked by Miley on April 16, 2008
  87. Chemistry

    Suppose a student used 28.4 ml of 0.100 M NaOH solution to neutralize the 25.0 ml of the lemon juice sample which contains citric acid (H3A)in it. H3A + 3NaOH -----> Na3A + 3H2O Molar mass of citric acid = 192.2 g/mole a)What is the molarity(M)of citric

    asked by Nam Le on December 14, 2014
  88. math induction

    prove the product of 4 consecutive integers is always divisible by 24 using the principles of math induction. Could anyone help me on this one? Thanks in advance! Sure For induction we want to prove some statement P for all the integers. We need: P(1) to

    asked by zomg on September 14, 2006
  89. Internatinal Relations

    Five of the most serious international problems facing the world today are: 1) the proliferation of WMD 2) international terrorism 3) economic development in impoverished countries 4) international financial stability 5) climate change In which of these

    asked by Jun on March 9, 2010
  90. trig

    I'm confused with this concept: Okay, so I have this problem: cos2x( 2 cos+1)= 0 I understand I have to work the problems separately and I get cos x= 2 and cos x= 1/2 Now, what I don't understand is how this connects to pi, radians or the unit circle. If

    asked by Anonymous on October 29, 2011
  91. science

    Different reference identify at least seven different problems with the following reference and the re-write the reference in its proper form Jo-Anne James; John Welles. (Nov.2009). The effects of Sleep Deprivation on Driver Errors, journal of applied

    asked by eid2013 on November 3, 2013
  92. college chemistry

    A solution is made by adding 0.100 mole of ethyl ether to 0.841 mole of ethyl alcohol. If the vapor pressure of ethyl ether and ethyl alcohol at 20oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20oC (assuming ideal

    asked by renee on February 26, 2012
  93. math

    1.solve for p 3(p+q)=p A.q=-2/3p B.q=-3/2p C.p=-2/3q D.p=-3/2q 2. solve for b then find the value of b when a=3 4a=2b-7 A.-9/2 B.5/2 C.19/2 D.17 3. solve for r d=rt A.r=dt B.r=t/d C.d/t D.r=d-t 4. find the width of a rectangle with a perimeter of 90 and a

    asked by oto on September 15, 2016
  94. Honors Pre-Calculus

    The prompt says "Graph each function. Determine the interval[s] for which the function is increasing and the interval[s] for which the function is decreasing." The problems that are given in this prompt are: 1. y= x^3+3x^2-9x 2. f(x)=1/(x+1)-4 3.

    asked by Jessica Miller on September 4, 2012
  95. Science

    1) If you let all of the liquid evaporate out of the pitcher, would you be able to see the solid particles of the drink mix? Explain. 2)Compare what happens when a geyser erupts to what happens when a tea kettle whistles. 3)Name something made of aluminum

    asked by Stepfanie on February 8, 2017
  96. algebra

    1.)correct 2.)wrong---> the first term is wrong 4(3a^2)^2 = 36a^4 3.) not sure on this one 4.) wrong---> - square root of six is not a solution Hope this Helps! 1)find p(-3)if p(x)=4x^3-5x^2+7x-10 =-184 2)If r(x)=4x^2-3x+7,find r(3a^2) =12a^4-9a^2+7

    asked by manny on August 16, 2007
  97. critical thinking

    what are the fallacies in 5. Letter to the editor: “I strongly object to the proposed sale of alcoholic beverages at County Golf Course. The idea of allowing people to drink wherever and whenever they please is positively disgraceful and can only lead to

    asked by suzie on March 15, 2010
  98. Management

    The administrator of the Life-Time Insurance Com¬pany HMO, Ms. Taylor, was anxious to solve poten-tial problems before their new clinic opened in Austin, Texas. In Buffalo, New York, where the original clinic is located, the pharmacy had been extremely

    asked by Shrestha on April 29, 2013
  99. math

    What properties are these problems? 1. 17 + ___ = 33 + 17 2. (10 + 4) + 21 = (___ + 21) 3. 14 × 25 = 25 × ____ 4. 8(4 × 2) = (8 × 4)____

    asked by Alex on September 27, 2008
  100. fractions

    i want to email you. please send email so i can send my math problems to you.

    asked by Daniel on July 19, 2009