1. math

    i am stuck on this problem! help! Write a quadratic equation that has two solution, 4 and -4. Leave the polynomial in reduced factored form.

    asked by mariana on August 6, 2013
  2. Chemistry

    I am completely lost with this question. If 50 ml of 0.5M HCl is added to 800 ml of pure water, what will be the approximate pH of the resulting solution?

    asked by Sarah on April 7, 2017
  3. general chemistry

    Calculate the molarity of each of the following solutions. 12.03mg KI in 107.6mL of solution.Express your answer using four significant figures.

    asked by Pat on March 7, 2013
  4. Chemistry

    Suppose you dissolve 10 grams of HCl gas in 250 ml of water initially at 25 C, what will the final temperature of the solution be?

    asked by Rita on October 24, 2012
  5. chemistry

    a saturated solution of potassium chloride prepared at 60degree celsius is allowed to cool at room remperature

    asked by jasper on October 12, 2014
  6. AP Chemistry

    What volume of water was added to the 350 mL of NaOH solution? Assume volumes are additive. Answer in units of mL

    asked by Gabriella on September 11, 2013
  7. chemistry

    What is the molarity of NaOCL in a solution of bleach if 10.00mL requires 22.35mL of 0.0291 M Na2S2O4 to reach the endpoint.

    asked by Megan on November 3, 2010
  8. Science

    What are some examples of precipitate? Definition: an insoluble solid formed in a liquid solution as a result of some chemical reactions

    asked by Christina on April 18, 2010
  9. Chemistry

    What is the freezing point of a solution of sucrose (table sugar), a nonelectrolyte, that contains 60.0 g of C12H22O11 dissolved in 413 g of water?

    asked by Jade on September 11, 2013
  10. chemistry

    2NaI (aq) + Cl2 = 2NaCl (aq) + I2 (s) If the ml of 0.45 M NaI are reacted with chlorine gas: What will be the molarity of the resulting salt solution?

    asked by Gabby on December 5, 2011
  11. Chemistry

    After calculating the mass of NaOH to make the approximate 0.2mol/L solution, why is it not crucial to weigh out an exact amount?

    asked by Chantelle on January 2, 2011
  12. physics

    a ball is thrown from level ground at 24 m/s, 30 degree above horizontal. How much time will it take to reach its maximum height? solution

    asked by tns on March 1, 2012
  13. chemistry

    determine the number of grams of solute needed to make 1.05 mole solution of HNO3 in 2.00Kg ofH2O

    asked by raymond on June 1, 2010
  14. chemistry

    Molarity of the solution that results when 71.3 g silver nitrate is dissolved in enough water to give a final volume of 757 mL.

    asked by Anonymous on February 13, 2011
  15. math

    formulate problem and solution Given: Time taken by light to travel 1 meter is roughly 3×10 raise to negative 8 seconds

    asked by Anonymous on September 30, 2016
  16. chemistry

    Molarity of the solution that results when 71.3 g silver nitrate is dissolved in enough water to give a final volume of 757 mL.

    asked by Anonymous on February 13, 2011
  17. chemistry

    Calculate the mass of pure NaCl that will yield enough HCl gas to neutralize 25cm3 of 0•5 of KCO3 solution

    asked by Ozioma on October 17, 2016
  18. Math

    My child came home with an assignment on line segments. one of the problems is rs=2x st=3x rt=25 Their teacher told them that the solution is 15. My question is how did they come to this answer ?

    asked by Ed on August 20, 2008
  19. Science

    0.005 mol of non-electrolyte was dissolved in 50g of benzene. Calculate depression of a freezing point of this solution

    asked by Ankur on March 20, 2018
  20. chemistry

    Determine the minimum concentration of the precipitating agent on the right to cause precipitation of the cation from the solution on the left. 3.0*10^-2 M BaNO3;NaF

    asked by kathleen on July 29, 2010
  21. Science Chemistry

    A saturated solution of kcl is prepared at 25degree celsius. What would happen if temperature is cooled to 10degree celcius?

    asked by Jim on September 17, 2016
  22. Chemistry

    A student measures k for a certain blue due to be 19.4 m^-1 at 560 nm. What is the molarity of the dye in a solution with an absorbance of .118 at this wavelength ?

    asked by Anonymous on August 19, 2014
  23. chemistry

    Write the balanced equation for the neutralization reaction between H3PO4 and NaOH in aqueous solution. Phases are optional.

    asked by Karen on May 14, 2014
  24. chemistry

    what is the procedure for determining the boiling point of 1 M solution of sugar,urea,glucose,NaCl,BaCl2,AlCl3

    asked by mrunal on November 5, 2014
  25. Organic Chemistry

    Suppose you forget to add sodium carbonate to your tea solution prior to extraction. What effect would this have on your yield, and why?

    asked by sunny on February 25, 2010
  26. Chemistry

    How much calcium chloride would you need to dissolve in 500 grams of water to create a solution whose boiling point is 100.40 C?

    asked by anaymous on December 6, 2010
  27. math

    A student claims that the equation Ö(-x) = 3 has no solution, since the square root of a negative number does not exist. Why is this argument wrong?

    asked by alicia on December 7, 2009
  28. Chemistry

    If you are asked to make exactly 1.0 Liter of 0.80 M ZnCl2 solution, how many grams of zinc chloride would you need to be massed out? How do I go about solving this problem?

    asked by Annie on July 13, 2016
  29. Chemistry

    What is the [H3O+] concentration of a pH 8.2 solution produced by a buffer made from acetic acid (pKa= 4.8) and sodium acetate?

    asked by Veronica on January 17, 2019
  30. chemistry

    When dissolved in 1000 g of water, which chemical compound will produce a solution with the greatest freezing point depression?

    asked by mercedes on June 17, 2011
  31. chemistry help

    What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?

    asked by paula on March 30, 2015
  32. Chemistry

    Calculate the molal concentration. A 1% (w/w) solution of cocaine hydrochloride ( molar mass 339.81 g/mol) in water.

    asked by Student on February 18, 2016
  33. Chemistry

    Calculate the mass of solid AgNo3 that can be added to 2.0 L of 0.10M K2CrO4 solution in order to just start precipitation?

    asked by Sarah on February 27, 2017
  34. Chemistry

    If 4.39 g AlCl3 is dissolved in enough water to make exactly 100.0ml of a solution, what is the molar concentration of the chloride ion?

    asked by Karen on March 31, 2018
  35. Organic Chem

    can anyone tell me..or send any links..that could tell me what would happen if Bromine solution is reacted with cycloHEXENE both in the dark and light?? i can't seem to find anything abt it

    asked by AllyKat on November 25, 2007
  36. chemistry

    How many mL of 0.0500 M phosphoric acid (H3PO4) are needed to titrate completely 50.0 mL of 0.150 M barium hydroxide (Ba(OH)2)) solution?

    asked by steve on November 14, 2010
  37. chemistry

    For the following reaction in acidic solution. Cr2O7^2- + I- ---> Cr^3+ + IO3- Give the total balanced net ionic equation.

    asked by Annie on June 17, 2013
  38. biology / plasmolysis of human red blood cells

    Plasmolysis of human red blood cells would occur if the cell were in .. solution A) isotonic B) hypertonic C) hypotonic D) none of these I think it's B. I'm not too sure though.

    asked by Kareen on November 27, 2007
  39. chem

    After obtaining a greenish color in an experiment what does this tellyou about the relative concentrations of H^+ and OH^- in the solution? pls help i really need a simople explanations about this.

    asked by akira 12 on December 3, 2012
  40. chemistry

    please help this equation is driving my crazy. balance the following redox reaction in basic solution. H2O2 + ClO2 --> ClO-2 + O2

    asked by Monique on November 23, 2011
  41. chemistry

    ____?____g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m(molality).

    asked by UN on June 26, 2008
  42. Math

    Find the general solution to the differential equation that models the statement:"The rate of change of P with respect to x is proportional to 15-x.

    asked by Dea on February 17, 2016
  43. Chemistry II

    What is [H3O+ ] (in M) in a solution of 0.078 M HBrO2 and 0.036 M NaBrO2? (Assume Kw = 1.01 ✕ 10^−14.) HBrO_2(aq) + H_2O(l) H_3O^+(aq) + BrO_2^−(aq); Ka = 3.7 ✕ 10−4

    asked by Jamie on March 11, 2018
  44. chemistry

    What is the concentration of a standard solution? - It was prepare to 250mL, it contained 9.7563g (O.lM) of (NH4) and 3mL of sulphuric acid.

    asked by Tiff on September 20, 2011
  45. ECONOMICS

    solution:the total cost function of a firm is given by C=.04q^3-.9 q^2+10q+10.find slope of average cos?

    asked by NISHAT on February 27, 2013
  46. chem

    Balance the following oxidation-reduction reaction in acid solution: SO32- + MnO4- --> SO42- + Mn2+ + H2O

    asked by Anonymous on March 25, 2008
  47. Science

    A saturated solution of kcl is prepared at 25degree celsius. What would happen if temperature is cooled to 10degree celcius? ????????

    asked by Anonymous on September 17, 2016
  48. Chem

    calculate the volume in ml of 0.250 M silver nitrate solution required to react completely with a 5.00 g piece of copper

    asked by No on April 19, 2012
  49. Chemistry

    A solution that is formed by combining 400. mL of 0.20 M HNO3 with 600. mL of 0.10 M NaOH has an H3O+ concentration of a. 0.20 M. b. 0.10 M. c. 0.060 M. d. 0.020 M. e. 5.0 ´ 10-13.

    asked by Fatima on May 26, 2011
  50. biology

    if hydrogen flouride (HF) is dissolved in pure water will the pH of the solution be lesser or greater than 7? please explain why? thank you so much ! please i need the answer tonight!!!!!

    asked by heather on October 7, 2009
  51. Chemistry

    What is the freezing point of a solution that contains 3.5 mol of the ionic solid BaCl2 dissolved in 500 grams of water?

    asked by Trece on November 27, 2017
  52. Chemistry

    A solution contains a mixture of Cl- and Br- ions. Can both be positively identified? Briefly explain and write appropriate equations to support your answer.

    asked by Leah on March 23, 2011
  53. Chem

    calculate the volume in ml of 0.250 M silver nitrate solution required to react completely with a 5.00 g piece of copper

    asked by No on April 19, 2012
  54. Chemistry

    How much water must be added to 482. mL of 0.201 M HCl to produce a 0.147 M solution? (Assume that the volumes are additive.)

    asked by Lailah on December 2, 2012
  55. chemistry

    A current of 0.965 A is passed through 500 ml of 0.2 M solution of ZnSO4 for 10 min. The molarity of Zn2+ after deposition of Zn is 1. 0.1M 2. 0.5M 3. 0.8M 4. 0.194M

    asked by hriday on February 19, 2009
  56. Chemistry

    Draw a model of a solution in which water (h2o) is the solvent and carbon dioxide gas (co2) is the solute?

    asked by Jasmine on November 27, 2010
  57. chemistry

    What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)?

    asked by john on February 19, 2017
  58. Chemistry

    How many grams of sodium acetate, NaC2H3O2, would have to be added to 5.00 L of 0.65 M acetic acid (pKa 4.74) to make the solution a buffer for pH 4.00?

    asked by Anonymous on April 24, 2014
  59. Science

    . What is the freezing point of a solution that contains 3.5 mol of the ionic solid BaCl2 dissolved in 500. grams water?

    asked by Raam on December 4, 2016
  60. Chemistry

    Balance the following equation for a half reaction that occurs in basic solution. Use e– as the symbol for an electron. SO3^2- ---> S2O4^2-

    asked by BOB on May 4, 2014
  61. Chemistry

    What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH)

    asked by Daryll on February 19, 2017
  62. chemistry

    If the thyroid test requires 3.2mCi in an "atomic cocktail," how many milliliters are used to prepare the iodine-131 solution?

    asked by mona on November 1, 2013
  63. Chemistry

    Can anyone explain this question to me? Which of MgCO3, NaOH and Mg(OH)2 can be used as an indicator of halide anions in solution. I don't understand what this means.

    asked by Anna on December 18, 2009
  64. math

    Find the area of a rectangle if its length measure 12 cm and its width measures 13 cm. Include correct units with the solution.

    asked by jenna on July 3, 2011
  65. Math

    What is the least number of square pieces into which a cardboard, 13ft long and 8ft wide can be cut? solution pls...

    asked by HELP HELP HELP MNHS on February 5, 2013
  66. solid mensuration

    Find the area of a segment of a circle whose diameter is 16 cm & the central angle measures 80 degrees. Please include solution. Thanks.

    asked by Cathy on December 1, 2012
  67. Science

    If 33.7 grams of LiOH dissolve in enough water to make a 231-gram solution, what is the concentration in percent by mass?

    asked by Josh on March 10, 2014
  68. Chemistry

    How many grams of hydrogen peroxide (H2O2) must be added to 1,500 ml of water to produce a concentration of 1.33 m (molal solution)?

    asked by Damon on July 20, 2016
  69. Chem

    What mass of glycerin (C3H8O3), a nonelectrolyte, must be dissolved in 216.2 g water to give a solution with a freezing point of -1.62 °C?

    asked by Stephany on March 31, 2010
  70. chemistry

    when 400g of a 20% sol. by weight was cooled ,50g of solute percipited .the percentage concentration of remaining solution

    asked by solution... on July 6, 2011
  71. Chemistry

    How many grams of KI must be added to a 250-ml volumetric flask to prepare a water solution that is 0.100 M in potassium iodide?

    asked by Miranda on March 14, 2017
  72. chemistry

    A solution is prepared by mixing 50.7 mL of 0.28 M Pb(NO3)2 with 70.8 mL of 1.0 M KCl. Calculate the concentrations of Pb2+ and Cl - at equilibrium. Ksp for PbCl2(s) is 1.6 10-5.

    asked by jeff on February 21, 2013
  73. Chemistry

    Write the ionic equation for the reaction of lead 2 nitrate reacting with the acidic solution to form a precipitate

    asked by Caro on August 29, 2014
  74. chem

    In the laboratory you are asked to make a 0.574 m iron(III) nitrate solution using 315 grams of water.

    asked by qua on February 28, 2015
  75. chemistry

    Calculate the amount of silver deposited at cathod when 5 ampere of current is passed for 50 minutes through a solution of AgNO3

    asked by ali on March 12, 2017
  76. Chemistry

    What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH)

    asked by Daryll on February 19, 2017
  77. calculus differential equation

    Find in implicit form the general solution of differential equation dy/dx=2(e^x-e^-x)/y^2(e^x+e^-x)^4 with (y>0). I know this requires a seperation of variables but I beyond that I am confused by how.Thanks.

    asked by malcolm on February 12, 2011
  78. chem please

    If 60 g water is evaporated from the solution at the same time as the temperature is reduced from 25.0 to 0.0 degree celsius, what mass of KNO3(s) will recrystallize?

    asked by Erin on February 1, 2009
  79. Chenistry

    If 33.7 grams of LiOH dissolve in enough water to make a 231-gram solution, what is the concentration in percent by mass?

    asked by ilyrae on March 21, 2011
  80. Chemistry

    Calculate the pH at the equivalence point in titrating 0.110 M solution of sodium hydrogen chromate (NaHCrO4) with 8.0×10−2 M NaOH.

    asked by Kaitlyn Smith on April 22, 2012
  81. scie

    A bottle of concentrated sulphuric acid (Density =1.80 gcm/cm cube) is labelled as 86% by weight. What is the molarity of the solution?

    asked by aarti on June 16, 2013
  82. Chemistry

    Which compound forms a colored aqueous solution? a) CaCl2 c) NaOH b) CrCl3 d) KBr i think its Cr because its an transition metal. but im not sure.

    asked by John on October 21, 2010
  83. organic chemistry

    What volume of physiological saline solution (90% by weight NaCl, in water) would give you a gram of salt when evaporated?

    asked by tina on January 23, 2011
  84. Chem

    Calculate the volume of .300 M NaOH needed to prepare a pH=3.50 buffer with 250ml of .075M HF solution. pKa (HF) = 3.15

    asked by Will on February 11, 2012
  85. chemistry

    What is the pH of a solution when 1ml of 0.10M NaOH is added to 100ml of buffer containing 0.1M acetic acid and 0.1M sodium acetate?

    asked by hawi on December 2, 2012
  86. Chemistry

    What is the molar absorption of a 9.8 x 10-6M solution of bilirubin dissolved in methanol having an absorbance of 0.600 when measured in 1.0 cm cuvette at 435nm?

    asked by Noha on February 7, 2015
  87. Chemistry

    Calculate the mass of solid required to prepare 100 mL of a .50 M aqueous solution copper II sulfate pentahydrate. Help please!!

    asked by Lisa on February 27, 2018
  88. chemistry

    Thallium(I) hydroxide is a strong base used in the synthesis of some organic compounds. Calculate the pH of a solution containing 2.13 g TlOH per liter.

    asked by crystal on August 8, 2008
  89. calculus differential equation

    Find in implicit form the general solution of differential equation dy/dx=2(e^x-e^-x)/y^2(e^x+e^-x)^4 with (y>0). I know this requires a seperation of variables but I beyond that I am confused by how.Thanks.

    asked by malcolm on February 12, 2011
  90. Chemistry

    what is the mass of nh4cl that must dissolve in 100. grams of h2o to produce a saturated solution at 70 degrees celsius

    asked by Anonymous on June 11, 2014
  91. chemistry

    What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?

    asked by paula on March 28, 2015
  92. trig

    Use substitution to determine whether the given x-value is a solution of the equation: sinx = -3sqrt/2, x=4pi/3 A) Yes B) No C) More information is needed D) The problem is indeterminate

    asked by Steve on December 17, 2009
  93. chemistry

    Explain the following statement. When aqueous ammonia is added to solution containing Pb2+ ions, a white precipitate is formed.

    asked by oliver on January 3, 2016
  94. trig

    Use substitution to determine whether the given x-value is a solution of the equation: sin x = -2sqrt3/3, x=4pi/3 A) Yes B) No C) More information is needed D) The problem is indeterminate

    asked by Steve on December 17, 2009
  95. Science IPS

    A mass of 10 g of sodium nitrate is dissolved in 10cm3 of water at 80 degrees (c). As the solution is cooled, at what temperature will a precipitate first appear?

    asked by Kailey on December 1, 2014
  96. CHEMISTRY

    What mass of aluminium nitrate (Al(NO3)3) would be required to prepare 2.000 L of a 0.0160 M aqueous solution of this salt?

    asked by Anonymous on April 1, 2018
  97. Chemistry

    WHAT ARE THE MAJOR SPECIES PRESENT IN A AQUEOUS SOLUTION OF 1.0M CH3C00H? I) CH3COOH II) H20 III) H30+ IV) CH3COO- VI) OH-

    asked by Jennifer on March 7, 2017
  98. Chemistry

    Sulfuric acid, H2SO4, is sold as a 36% aqueous solution. What is this concentration in A. Molality B. Molarity C. The Mole Fraction Please and thank you. :)

    asked by Em on October 1, 2012
  99. chem11

    write out the balanced reaction for magnesium and copper (I) chloride solution. Mg2(s) + 4CuCl2(aq) -> 2MgCl2(aq) + 4Cu(s) is this right? i'm not sure exactly how to do this. Please help

    asked by helloworld:) on July 18, 2010
  100. Algebra 2

    How many set solutions are there for this problem 33x + 103y = 6526? The solution cannot contain negative integers or decimals and fractions.

    asked by Peter on September 30, 2011

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