1. physics

    A laser beam passes from air into a 25% glucose solution at an incident angle of 37 ∘ . In what direction does light travel in the glucose solution? Assume the index of refraction of air is n = 1.

    asked by james on March 27, 2016
  2. Chemistry

    You prepare a buffer solution by dissolving 2.00 g each of benzoic acid, C6H5COOH and sodium benzoate, NaC6H5COO in 750.0 mL of water. What is the pH of this buffer? Assume that the solution's volume is 750.0 mL.

    asked by Dron on April 24, 2016
  3. Chemistry

    The ΔH per mole of CaCl2 is -81.0 kJ. Calculate the final temperature of an aqueous solution if 30 g of CaCl2 are added to 100 g of water at 23oC. Assume that the specific heat of the solution is the same as that of water

    asked by Felicia on October 7, 2010
  4. Chemistry

    A 0.25 M CuSO4 solution is required. A student is given 60 grams of copper sulphate. Calculate the volume of water needed to dissolve copper sulphate crystals and make this solution.

    asked by Wendy Mark on April 22, 2019
  5. grade 12 chemistry

    Q. a 50g sample of Al(NO3)3 is dissolved in water to prepare 1500ml of solution. What is the concentration, in mol/L, of NO3 ions in the solution? -The answer is 0.47 mol/L but I don't know how to solve it.

    asked by wiz on February 4, 2009
  6. Chemistry

    An aqueous solution of HCl has a high electrical conductivity when compared to the compound in hexane, whilst the conductivity of a solution of the compound in diethyl ether has an intermediate value. Explain.

    asked by Matt on January 8, 2013
  7. Biology

    You have a stock solution of 100mg/100ml methylene blue and you need 6.0 ml of final solution at 2mg/100ml. Design a serial dilution using volumes between 0.1 and 10 ml. Final volume must be 6ml.

    asked by Anonymous on January 19, 2015
  8. Math 3

    Solve by factoring: One of the solutions to the quadratic equation x^2 - 13x + 30 is 3. What is the other solution? Is it:(x+3) If 3 is a solution, then the quadratic contains a factor (x-3). The other factor is thus (x-10), and it follows that the other

    asked by Margie on January 30, 2007
  9. Chemistry: Acids/Bases

    When a 100 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.9. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium acetate solution in order to bring its pH to the target value of 5.00.

    asked by Tim on April 11, 2015
  10. chemistry

    What is the concentration of a potassium iodate solution after you complete the following porcedure? Pipette 10 mL of a 0.31 M potassium iodate stock solution to a 100-mL volumetric flask and then add water to the mark.

    asked by wallace on November 6, 2018
  11. Chemistry

    I have to make a game based on the periodic table Here are the standards we could put in the game: Students know how to relate the position of an element in the periodic table for it's atomic number and mass Students know how to use the periodic table to

    asked by johnny on March 6, 2008
  12. Chemistry

    2HCr4- + 3HS03- + 5H+ -> 2Cr3+ + 3SO4^2- + 5H20. At t=0, 0.0249 mols of HCr04- are loaded in to 250ml of solution. After 1/10 of an hour, 0.00852 mol of HCrO4- remain. Assuming the solution volume remained the same, how many grams of water were formed per

    asked by Tri on September 23, 2008
  13. language arts

    pick out the verbs and rewrite in standard English. Kevin went to borrow books from the library. when he got home he found that some pages were torn out and others were missing an med the spine of one was twisted.He took the books back to the library and

    asked by Oracabessa primary school on November 8, 2011
  14. Algebra

    Three girls paid $100 each, a total of $300, to share a Motel Room. Later, the desk clerk realizing she should have only charged $250, gives the Room Attendant $50 and asks him to return it to the three girls. Unable to divide the money three ways, he

    asked by Delaney on October 14, 2010
  15. Algebra

    Alvin throws the football to a receiver who jumps up to catch the ball. The height of the ball over time can be represented by the quadratic equation -4.9t^2 + 7.5t + 1.8 = 2.1 . This equation is based on the acceleration of gravity -4.9 m/s^2, the

    asked by Klauus on March 8, 2019
  16. Biology

    41. A group calling itself "Virus Alive!" believes that viruses are living organisms. They have petitioned the scientific community to include viruses in the biological classification system. You are a scientist assigned to explain to this group that,

    asked by mysterychicken on February 20, 2010
  17. Inorganic Chemistry

    I messed up on my titration: filled part of the burette with a supersaturated solution of KHTar(2.073g...MM=188.18amu) dissolved in 150mL diH2O, instead of the 0.051M NaOH solution. I know it wasn't more than a few mL, but I noticed a huge difference in

    asked by Christina (PLZ HELP!!) on July 14, 2011
  18. Chem hwk

    How many grams of solute are required to make a 504 mL solution of copper (I) nitrate with a concentration of 1.3317 M? I go 238.6 g but my friend said I'm way off When 84.2730 grams of solute are used to make a 504 mL solution of copper (I) nitrate, what

    asked by Tif on April 29, 2013
  19. CHEMISTRY

    If a solution is made by dissolving 15g of each solid in the same 100g of water at 70 degrees and the solution is cooled to 20 degrees, crystals are observed.. Which solid crystallises and explain in reference to both solids

    asked by Gabrielle M on September 15, 2015
  20. Chemistry

    a solution of arsenic oxide containing 0.24g required 50cm^3 of acidified potassium manganate of solution of concentration 0.02M for complete oxidation. What is the oxidation state of arsenic in the product?

    asked by Bela on October 22, 2014
  21. Chemistry

    When ammonium chloride is dissolved in water, the solution becomes colder. What can you say about the relative magnitudes of the lattice energy of ammonium chloride and its heat of hydration? Why does the solution form? What drives the process?

    asked by Samantha on September 20, 2010
  22. Chemistry

    A solution is prepared that has [NH3]=1.00M and [Cl-]=0.100M. How many grams of AgNO3 can be dissolved in 1.00L of this solution without a precipitate of AgCl(s) forming? Ksp of AgCl = 1.8x10^-10 Kf of [(Ag(NH3)2)+] = 1.6x10^-7

    asked by Jeannie on April 14, 2010
  23. Math

    You have a piece of lumber that is 4 yards long. You want to cut lengths 2/3 yard long to use in a shelf you are building. How many shelves can you cut? Draw a picture of your solution. Explain your solution in words.

    asked by Reyna Aureolus on December 3, 2018
  24. Calculus

    Show that u(x, t) = f(x−ct)+g(x+ct), where c is a constant and f and g have continuous second derivatives, is a solution of the wave equation in one dimension, ie (∂t)^2 u = c^2 ∂x^2 u. Note that this solution to the wave equation consists of two

    asked by Margo on September 30, 2015
  25. MEC

    When 25.0 mL of 1.00 M HCl (0.025 mol)is mixed with exactly 25.0 mL of NaOH (0.025 mol) in a calorimeter, the temperature of the solution increased from 25.00 °C to 27.30 °C. (a) Is the reaction exothermic or endothermic? (b) If the specific heat of the

    asked by Jessica jean on December 9, 2015
  26. chemistry

    A student wishes to prepare 1.000 g of silver chromate. How many mL of .05000M silver nitrate solution should be added to 50.00 mL of .0700M potassium chromate solution assuming 100% yield

    asked by mom on September 25, 2012
  27. calculus

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) sin θ cos θ − 2 sin θ = 0

    asked by stellar on October 21, 2011
  28. Chemistry

    if antiseptic hydrogen peroxide is 3% H2O2 by mass, approximately how many moles of H2O2 are present in each gram of antiseptic solution? you can assume the solution has the same density as water. show your calculations.

    asked by Ivy on December 2, 2011
  29. chemistry

    The mass of solute per 100 mL of solution is abbreviated as (m/v). Mass is not technically the same thing as weight, but the abbreviation (w/v) is also common. How many grams of sucrose are needed to make 655 mL of a 36.0% (w/v) sucrose solution?

    asked by jackson on November 17, 2014
  30. Chemistry

    An aqueous solution contains 0.216 M ascorbic acid (H2C6H6O6) and 0.131 M hydrochloric acid. Calculate the ascorbate (C6H6O62-) ion concentration in this solution. [C6H6O62-] =______________ mol/L.

    asked by Ana on April 21, 2012
  31. Chemistry

    A 15.5 mL sample of 0.215 M KOH solution requires 21.2 mL of acetic acid in a titration experiment. Calculate the molarity of the acetic acid solution. Please show all steps, I don't understand this.

    asked by Tina on May 23, 2011
  32. Biochemistry

    HELP!! Describe how to prepare 800 ml of a 0.100 M potassium acetate buffer, pH = 4.46 (n.b. pKacetic acid = 4.76). You have glacial acetic acid (17.6 M), a 1.000 M solution of KOH and a 1.000 M solution of HCl.

    asked by Jerrica on December 18, 2011
  33. pre-calculus

    solve the equation 1. In x + In (x+12) =2 x= ? or either there is no solution 2. solve the exponential equation 9^x=6 What is the exact answer? 3. Use transformations to indentify the graph of the function. Then determine its domain, range, and horizontal

    asked by ladybug on October 6, 2012
  34. chemistry

    what is the molality of a 0.068M solution of ethyl alcohol in water at 25 degrees celsius. (assume the density of the solution at such a low concentration is equal to that of water at 25degrees celsius, 0.997g/ml)

    asked by belinda on February 2, 2011
  35. chemistry

    A 4.14 m solution of the solute methylene chloride dissolved in the solvent ethanol is available. Calculate the mass ( kg ) of the solution that must be taken to obtain 1487 g of methylene chloride. CH2Cl2-1327 (kg/m^3) C2H5OH-789.3 (kg/m^3)

    asked by eng on January 28, 2010
  36. chemistry

    g)How many grams of agarose are needed to make 100 ml of 2.5% agarose solution?. h) Calculate the volume of buffer to which 500mL of 40 mM potassium chloride solution must be diluted to make a new concentration of 0.001M.

    asked by roshan on September 13, 2011
  37. chemistry

    what is the molality of a 0.068M solution of ethyl alcohol in water at 25 degrees celsius. (assume the density of the solution at such a low concentration is equal to that of water at 25degrees celsius, 0.997g/ml)

    asked by belinda on February 2, 2011
  38. chemistry

    what volume (in L) of 0.150 M KCl solution is required to completely react with 0.150 L of a 0.175 M Pb(NO3)2 solution according to the following balanced chemical equation? 2KCl (aq) + Pb(NO3)2 (aq) --> PbCl2 (s) + 2 KNO3 (aq)

    asked by samantha on June 21, 2010
  39. Chemistry

    Suppose you are going to add 450 mL of a 0.10 mol/L hydrochloric acid solution to 250 mL of a 0.2 mol/L sodium hydroxide solution. a)Which one is the limiting reactant? b)What is the theoretical yield of sodium chloride?

    asked by Maame on December 10, 2011
  40. Chemistry

    Suppose we are dealing with calcium chloride as opposed to the chemical in the video. If a solution contains 70 g of calcium chloride per 100 g of water at 25 degrees Celsius, is the solution unsaturated, saturated, or supersaturated?

    asked by Moise on May 19, 2013
  41. ap chemistry

    A solution is prepared in which a trace or small amount of Fe+2 is added to a much larger amount of solution in which the [OH]- is 1.0M*10^-2. some Fe(OH)2 precipitates. the value of Ksp for the salt is 8.0*10^-10. assuming that the hydroxide ion

    asked by brian on October 19, 2010
  42. Chemistry

    Suppose we are dealing with calcium chloride as opposed to the chemical in the video. If a solution contains 70 g of calcium chloride per 100 g of water at 25 degrees Celsius, is the solution unsaturated, saturated, or supersaturated?

    asked by Steptim on July 8, 2013
  43. Chemistry

    What is the volume of a solution of 0.5 M NaOH that must be added to adjust the pH from 4 to 9 in 20 mL of a 100 mM solution of phosphoric acid? Its been about 4 years since I've done this stuff. All I know is the pKa of phosphoric acid is 2.15 and I'm

    asked by Waleed on September 23, 2010
  44. chemistry

    8.58g of coastic soada was dissolved to produce a solution of 500cm3 .to neutralize 50cm3 of this solution 15cm3 of 0.4M HCl was consumed .(coastic soada = Na2CO3.XH2O ) find the value of X?

    asked by fathima on December 18, 2012
  45. Shawn

    How many milliliters of 0.355 M NaF solution are needed to react completely with 24.6 mL of 0.216 M CaCl2 solution? How many grams of CaF2 will be formed? The reaction is CaCl2(aq) + 2NaF(aq) → CaF2(s) + 2NaCl(aq)

    asked by Chemistry on July 8, 2011
  46. Chemistry

    How would you prepare 500.0 of an aqueous solution of glycerol with a vapor pressure of 24.8mm Hg at 26 degree Celsius (vapor pressure of pure water=25.21mm Hg)? assume the density of the solution to be 1.00 g/mL.

    asked by Kris on September 10, 2012
  47. lab chem

    If toluene (density 0.87) wre used to extract ethylene bromohydrin (density 2.41) from an aqueous solution, a. Could you be certain that the organic solution would form the upper layer? b. by what test could you identify the nonaqueous layer.

    asked by Poole on September 23, 2008
  48. Chemistry

    2MnO4-(aq) +5 H2O2 (aq) + 6H+(aq) -> 5 O2(g) + 2 (Mn2+(aq) = 8H2O (l) If a 25.00 ml sample of hydro peroxide required 25.25 ml of .353 M KMNo4 solution to react with all the hydrogen perozide what was the molarity of the hydrogen peroxide solution?

    asked by Vinny on June 7, 2011
  49. Chemistry

    I have water pH 7.0 insulation with various other things that do not affect pH, I am trying to add X amount of HCL to lower the solution to a pH of 1.5 I know pH=-log[HCl] but I'm not sure how to approach this problem, after this I am then trying to add

    asked by Margaret on April 24, 2015
  50. Chemistry

    What is the volume of a solution of 0.5 M NaOH that must be added to adjust the pH from 4 to 9 in 20 mL of a 100 mM solution of phosphoric acid? Its been about 4 years since I've done this stuff. All I know is the pKa of phosphoric acid is 2.15 and I'm

    asked by Waleed on September 23, 2010
  51. ap chem

    A certain volume of a .50 M solution contains 4.5g of a certain salt. What mass of the salt is present in the same volume of a 2.5 M solution? Indicate the concentration of each ion/molecule: A mixture of 50.0 mL of .2M KClO3 and 25.0 mL of a .20M Na2SO4.

    asked by lily on September 13, 2007
  52. math

    put in order least to greatest 2/5 4/8 6/7 3/4

    asked by sydney on October 27, 2011
  53. math

    how to put 2/3,1/2,4/5 and 7/30 in ascending order

    asked by angel on July 4, 2016
  54. math

    put in order from least to greatest; 3/3, 3/5, 3/6, 3/8

    asked by tatiana on September 14, 2011
  55. algebra

    8+3x6-4-1=13 where do I put parentheses

    asked by carol on September 4, 2014
  56. Math

    How do I put this into Vertex form? y=6x^2+7x+5

    asked by Bree on March 5, 2017
  57. english

    what is a good adverb for put

    asked by citlalli on March 16, 2010
  58. math

    put this in lowest to greatest 95,9.5,.95,.9,9 thank you

    asked by ST on March 16, 2010
  59. Algebra 1

    Name the property that is demonstrated by the example. 1. (2x)^3=2^3*x^3=8x^3 I am not sure what to put

    asked by Katie on December 2, 2013
  60. math

    m=7/8 point(5,-5) put in y=mx+b form

    asked by chandice on March 7, 2010
  61. Math

    How do I put this into the calculator: 4sqrt-1

    asked by Sam on January 18, 2013
  62. math

    when you put something in parenthesis like C(25,8) what does that mean or how do you solve it?

    asked by David on December 15, 2010
  63. Math plz help

    Put these smallest to largest 1. -3√2 2. √9 3. 2√3 4. -2√7

    asked by Help on March 1, 2017
  64. Algebra 2

    How would I put the following equations into y=mx+b form? x+y=4 -4x+y=9

    asked by Chrissy on September 22, 2010
  65. Algebra

    put the following into mx+b form. x+1/6y=1/2 I got either y=-x+1/12 y=-x+3 I don't know which one.

    asked by Kendra on April 9, 2011
  66. World History Check my answers

    Okay so i put a star* by each of my answers.

    asked by Karen on January 19, 2016
  67. algeba

    1 1/2x-4 2/3=11/6 not sure on how to put fractions in on the computer.

    asked by Mrs. Cash on May 27, 2013
  68. math

    Put parentheses for 6 + 1 × 1-20 = 29 is true

    asked by mujahith hasan on July 3, 2016
  69. Math

    how do i put 1/2, 2/3, 1/4, and 1/3 in order from least to greatest

    asked by Alex on June 2, 2013
  70. precalculus

    put this in trigonometric form: -3-i

    asked by bill on May 26, 2008
  71. Math

    0.03 need to put it into a decimal fraction

    asked by Melissa on December 2, 2008
  72. calculus

    Put the function P=15(1.1)^t in the form Pe^kt

    asked by Lauren on January 17, 2011
  73. math

    Put these in order from least to greatest: 13/16, 5/8, 3/16, 3/4, 7/8.

    asked by HELP!!! on February 2, 2012
  74. math

    27(2/3) 81(-3/2) how do i put those in radical form?

    asked by nolen on November 1, 2012
  75. algebra--1 question

    Simplify (2√5+3√7)^2 Can somebody put down the steps please? Thanks

    asked by SkatingDJ on May 2, 2015
  76. math

    how do you put a fraction into a percentage

    asked by ada on April 27, 2011
  77. chemistry

    When do you put the suffix (g) after a compound?

    asked by josh on February 2, 2012
  78. Vocabulary

    How could I put translate in a sentence?

    asked by Chelsea on October 1, 2008
  79. Pre-Cal

    how do we put x^2-2y^2=4 into a standard equation???

    asked by Soto on April 8, 2010
  80. math

    how to put x + 1/5y = -6 into function form (mx + b).

    asked by Anonymous on March 1, 2013
  81. Bio Research Paper

    Can you then tell me what to put in my conclusion? I'm so lost! -MC

    asked by mysterychicken on May 11, 2010
  82. English

    Put the water into the pan first.

    asked by Hayley on October 27, 2010
  83. Algebra 2

    I'm trying to solve 2e^(3x) + 5 = 2 but it's not working put well. Help please, someone?

    asked by Ana on March 9, 2010
  84. Family Report

    What should i put in a report about my family?

    asked by Mark on October 19, 2009
  85. art

    you put 15 marbles into 3 groups

    asked by baily on February 6, 2011
  86. Math

    Put these numbers from least to greatest. -21, 60, -62, 9

    asked by James on December 30, 2011
  87. Calculus

    put in standard form: 4x^2=36+9y^2

    asked by Josh on August 1, 2011
  88. 4th math

    greatest to least put these in the right order? 1/3 3/4 2/5 0.5 0.09 Thank you

    asked by heather on January 3, 2011
  89. algebra 2

    how do i put x^4 + 5x^2 -8 into quadratic form?

    asked by misty on March 13, 2009
  90. math

    Put these in order from least to greatest: 13/16, 5/8, 3/16, 3/4, 7/8.

    asked by HELP!!! on February 2, 2012
  91. Science

    I don't know anything to put for "Y" for Eukaryote. Help please.

    asked by Isabella on February 27, 2018
  92. Logic

    Put this on, And warm you'll be. Take one off, And an emotion, you'll see.

    asked by Hallo on January 9, 2013
  93. math

    Which inequality is equivalent to |x-4| x – 4 < 9 B. –9 < x – 4 < 9 C. x – 4 < –9 or x – 4 < 9 D. x – 4 > –9 or x – 4 < 9 I put B?

    asked by :) on May 29, 2015
  94. math

    27(2/3) 81(-3/2) how do i put those in radical form?

    asked by nolen on November 1, 2012
  95. algebra 1

    Put into standard form 3/x + 4/y = 2

    asked by Michelle on December 2, 2009
  96. spanish 3

    what can you put as an intro for an autobiography about yourself?

    asked by reina on September 2, 2014
  97. Math

    10^9, 10^-8, 10^5, 10^-6, 10^0 Put in order from least to greatest.

    asked by Anonymous on April 5, 2011
  98. math

    hot to put 17%, 11/20, 0.2, 8% as least to greatest

    asked by itzel on November 29, 2017
  99. Biology

    How is DNA put together into chromosomes?

    asked by Jany on June 4, 2010
  100. 8th grade math

    put this fractions in order 7/8, -5/8, 15/30, -8/11

    asked by jennifer on December 8, 2008