1. Algebra 1

    1. A chemistry student needs to make a solution that is 70% water and 30% hydrochloric acid. The student's current mixture of 300 ml is 60% water and 40% hydrochloric acid. How much water must the student add to achieve his desired solution? A: ? 2. 5. 2/t

    asked by Victoria on June 3, 2014
  2. math-please check my answer!!

    5x-7y=-14 7y-5x=14 what is the solution of the system of equations? ANSWER IS B??? A) A point B)Infinitely many solutions C) no solution Is the system consistent ot inconsistent? ANSWER IS CONSISTENT Is the system dependent or independent? ANSWER IS

    asked by Michelle on August 1, 2010
  3. Algebra 1

    23.what is the slope of a line parallel to a line represented by the equation x=2y-3? 19.what is the solution to the following system of equation? Y=4x-8 Y=2x 16.which graph below shows the function f(x)=-3x-1? 12.what is the solution to the following

    asked by Elyon on January 21, 2012
  4. Chemistry

    A solution of NaOH(aq) contains 7.7 grams of NaOH in 93 mL of solution. Calculate the pH at 25◦C. ---- 7.7 grams x (1 mol/39.997 grams) = 0.19 mol 0.19 mol/0.093 L = 2.07 M pOH = -log(2.07) = -0.316 ---- Am I doing anything wrong? Why am I getting a

    asked by Edwin on February 11, 2015
  5. chemistry

    I am trying to answer a bunch of lab questions about a lab I did and am stuck on finding the morality of the diluted vinegar solution? Can anyone help me? (I hope I gave enough info) Here where the lab procedures that I already went through: Transfer 10mls

    asked by Gweedo8 on June 12, 2009

    I am trying to answer a bunch of lab questions about a lab I did and am stuck on finding the morality of the diluted vinegar solution? Can anyone help me? (I hope I gave enough info) Here where the lab procedures that I already went through: Transfer 10mls

    asked by Gweedo8 on June 12, 2009
  7. science

    Observation The trash smells. Explanation Decaying biological material causes the trash to smell. Test (independent variable) Add food scraps to one trash can along with other materials, such as plastic, cardboard, paper, and tin. To a second trash can,

    asked by lydia on August 19, 2017
  8. Chemistry (molarity) (sorta an emergency)

    I'm doing a titration lab and writing a lab report where I'm sort of stuck on how exactly to find the concentration of HCl. These are the following info I have from the lab, Equation: HCl(aq)+NaOH(aq)-> H2O(l)+NaCl(aq) -Calculated molarity of NaOH solution

    asked by Ray on November 13, 2016
  9. analytical chemistry

    the problem is find the pH of a solution prepared by dissolving all of the following in sufficient water to yield 1.00 L of solution :0.180 mole of chloroacetic acid (CICH2CO2H),0.020 mole ofCICH2CO2Na,0.080 mole HNO3, and 0.080 mole Ca(OH)2. Assume that

    asked by lolo on March 31, 2013
  10. Chemistry

    A solution is made by mixing 42.0 mL of ethanol, C2H6O, and 58.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 C in torr? Values at 20C ethanol density: 0.789 g/mL & vapor pressure (torr): 43.9 torr water: denisty:

    asked by Joy on February 19, 2012
  11. Chemistry

    The solubility of insoluble substances changes depending on the nature of the solution. Below are two solutions in which copper (II) hydroxide is dissolved; in each case, the solubility is not the same as it is in pure water. a. For each solution state

    asked by Marina on January 3, 2016
  12. Chemistry

    1. calculate the volume of concentrated HNO3 (68%)that is needed to prepare stock solution 0.25M in 1000mL volumetric flask. (density HNO3 = 1.513 g/cm^3) 2. from above stock solution, determine volume needed to dilute to 500mL volumetric flask that

    asked by Susan on July 10, 2013
  13. chemistry

    1. calculate the volume of concentrated HNO_3 (68%)that is needed to prepare stock solution 0.25M in 1000mL volumetric flask. (density HNO_3 = 1.513 g/cm^3) 2. from above stock solution, determine volume needed to dilute to 500mL volumetric flask that

    asked by khadijah on July 10, 2013
  14. Chemistry

    In lab we determined the heat capacity of a calorimeter. The question is how would the heat capacity of the calorimeter be affected if the NaOH solution had been at 25 degrees Celsius and the HCl solution had been at 22 degrees Celsius when the two

    asked by Katy on November 1, 2010
  15. chemistry

    A solution containing 16.9 grams of a molecular compound dissolved in 250 grams of water has a freezing point of -0.744 degrees celcius. Find the molaltity of the solution. I have -0.744=-1.86*m*i. how do i find i. what is the gfm of the solute? I know

    asked by asldsfjaljd on April 9, 2008
  16. algebra

    How many solutions are there in the equation -0.2^2+12x+11=0. How do yoy know? What do the solutions represent? Is there a solution that dose not make sense? If so, in what way dose the solution not make sense?

    asked by Anonymous on November 4, 2011
  17. Math- algebra

    Evaluate: -20+-10=? 200 -200 2 -2 Evaluate: -12x3=? 36 -36*** 4 -4 What is the solution of 87 + (-96)? 183 -183 9 -9*** What is the solution to 204+(-36) 240*** -240 169 -168

    asked by Anonymous on August 29, 2017
  18. Chemistry

    If 10.0 g of substance X dissolved in 100 mL of solution, and the molarity of the solution is 1.0 M, what is the molar mass of substance X? 1000 g/mol 10 g/mol 1 g/mol 100 g/mol

    asked by Summer on April 11, 2018
  19. physics

    A hypodermic syringe is attached to a needle that has an internal radius of 0.303 mm and a length of 3.02 cm. The needle is filled with a solution of viscosity 2.00 10-3 Pa · s; it is injected into a vein at a gauge pressure of 16.1 mm Hg. Ignore the

    asked by ray on March 22, 2013
  20. hr

    Decision making is a process by which several possibilities are considered and prioritized, resulting in a clear choice of one option over others. Decision making is a fact of life personally and in business. We make dozens of decisions each day. Some

    asked by yvonne on June 2, 2011
  21. chemistry

    A saturated solution of potassium chlorate is formed from 100 grams of water. if the saturated solution is cooled from 80 degrees celsius to 50 degrees celsius, how many grams of precipate are formed? Do you have a table that lists the solubility at 80 and

    asked by Alexus on January 10, 2007
  22. Grammar

    Which word(s) does the clause in CAPS modify? 1.Will you wait UNTIL MR.HAMILTON RETURNS? A.you B.Will wait C.wait D.here B? 2.Our music teacher, Mrs.Goode, offered a solution that SURPRISED US ALL. A.teacher B.Mrs.Goode C.solution D.offered C Are these

    asked by mysterychicken on May 13, 2009
  23. math

    a chemist has a solution that is 20 percent alcohol by volume. which of the following expressions represents the percent of alcohol by volume when m litersof the solution is mixed with h liters of pure alcohol and p liters of water? a) 20(m+h+p)% b)

    asked by Jason P on July 23, 2009
  24. Algebra

    The area of a rectangular athletic field is represented by the expression square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense Òlength times widthÓ) of the athletic field. Include correct units with your

    asked by Jordyn on November 4, 2010
  25. Chemistry/maths

    Using the following stock solutions: NaCl, 100mmol KCl, 200mmol CaCl2, 160mmol Glucose, 5mmol Calculate the volumes of each stock solution and the volume of water needed to prepare 100ml of a single solution containing NaCl at 5.0mmol KCl at 2.5mmol CaCl2

    asked by jess on October 22, 2009
  26. stoichiometry

    When Ba(NO3)2 and K2CrO4 (sorry, i don't know how to do subscripts, but all the numbers should be subscripts!) react in aqueous solution, the yellow solid BaCrO4 is formed. Calculate the mass of BaCrO4 that forms when 3.50 x 10^(-3) mol of solid Ba(NO3)2

    asked by em on June 5, 2008
  27. Chenistry

    A 0.8870g sample of a mixture of nacl and kcl is dissolved in water and the solution is then treated with an excess of agn03 to yield 1.913g of agcl. Calculate the percentage by mass of nacl in the mixture 1.913g/ 143 = 0.0133 M agcl x/58 + Y/74 (0.887g-x)

    asked by Carlos on January 19, 2014
  28. maths

    for this quadratic equation: y2-4y-16 = 0 which two options are correct solutions, rounded to three decimal places? 1) -4.483 2) -3.243 3)-2.472 4) -1.472 5) -0.536 6) 5.243 7) 6.472 8) 12.443 You have to use the quadratic equation, we will be happy to

    asked by angel on April 15, 2007
  29. chemistry

    Calculate the mass of salts needed for constructing a buffer using potassium monobasic phosphate and potassium dibasic phosphate with the total concentration of 100 mM. The solution is to be prepared in DI water and the pKa value for potassium monobasic

    asked by dave on November 14, 2010
  30. chemistry

    Using your 0.0100M oxalate solution and only the equipment and supplies listed below, describe how to prepare a 0.00025M solution of oxalate. Note, you are not allowed to add volumes with pipettes. (example, if you want 20mLs, you can not use a 10mL + 10mL

    asked by Annie on June 17, 2013
  31. Chemistry

    Using your 0.0100M oxalate solution and only the equipment and supplies listed below, describe how to prepare a 0.00025M solution of oxalate. Note, you are not allowed to add volumes with pipettes. (example, if you want 20mLs, you can not use a 10mL + 10mL

    asked by Jessica on June 17, 2013
  32. Chem- follow up question

    Sorry i posted this as an answer after my question had been answered, this is continued from the qualitative analysis question: That reallly cleared some things up, but I do still have a few questions. Umm im not completely clear on the hyrogen peroxide

    asked by Joe on February 28, 2010
  33. chemistry

    Q.1Explain why CH3COOH2^+ is in terms of protonic concept? Q.2 0.1 mole HCl is dissolved in distilled water of volume V then at a limit V =infinite pH of the solution is equal to______? Q.3One litre of water contains 10^-5 moles of H^+ ions at 25 degree

    asked by anonymous on January 6, 2010
  34. psychology

    A behaviorist is asked to evaluate five students in the second grade who exhibit impulse control problems. The behaviorist decides it is best initially to study them in the classroom without interfering with the behavior. This behaviorist is conducting

    asked by Anonymous on April 9, 2013
  35. psychology

    A behaviorist is asked to evaluate five students in the second grade who exhibit impulse control problems. The behaviorist decides it is best initially to study them in the classroom without interfering with their behavior. This behaviorist is conducting

    asked by elly on June 19, 2015
  36. another rotation

    A hollow cylinder (hoop) is rolling on a horizontal surface at speed v = 1.85 m/s when it reaches a 23.5° incline.How far up the incline will it go? How long will it be on the incline before it arrives back at the bottom? Again, I am so confused about

    asked by Liz on March 11, 2010
  37. algebra

    In finding distance problems i understand the use of formula of d/rt then what i do not understand is the giving solutions in 3 decimal places. Can someone give an example step by step? The answer I do not need it is how to do it? Textbook says use

    asked by Mary on May 28, 2010
  38. Algebra 1

    "Solve each system algebraically. Identify each system as cosistent and dependent, cosistent and independant, or inconsistant." my teacher didn't go over this in class and i have no idea what it means! here are the problems: #1) 2f+3g=11 f-g=(-7) #2)

    asked by Mel on February 16, 2009
  39. English

    Having problems with a introductory sentence. Its a essay on dying and living. I wrote a question to start my intro. Sentence. Or I wrote The professor died in 1974 of Cancer. Someone please let me know if I started out right. Please

    asked by Mike on April 12, 2013
  40. Algebra 1

    I need help to this mathe problems... 1.Elimination using Multiplication x-5y=0 2x-3y=7 Find the value of x in one equation. x = 5y Then substitute that value for x in the second equation. Solve for y, then find the value of x. Insert both values into the

    asked by Cristina on May 14, 2007
  41. Health care Administration

    What is your vision for the new health care system? Who benefits most from this new system? Are there any populations that would be disadvantaged by this new system?If so, who? What current challenges would be solved by implementing your new proposal?

    asked by Susan on January 10, 2010
  42. english/ world geo.

    Their are many lingering effects of communsim. I think the most important effects of communsim is the economic and political problems in Eastern Europe. please proofread ( might be factual or spelling punction etc.) there are 6 mistakes in this sentence.

    asked by christina on December 14, 2009
  43. Social Studies

    In what way is Stalin's rule still most felt in Russia today? A) Industries cover much of Siberia. B) Industrialization has lead to excessive pollution. C) Industrialization has lead to health problems. D) All of the above. ** My answer is D.

    asked by @AmeliaTheGamer on May 15, 2017
  44. Precalculus problems check?

    Did I do these two problems right? P(1-sqrt2) = 8x - 4x^2 P(1-sqrt2)= -4 P(2/x)= 8x - 4x^2 P(2/x) = x-1 I think when the answers are plugged back in, the equation is supposed to equal zero, but I don't get this; however, I always redo each problem with

    asked by Emily on September 1, 2009
  45. Algebra

    "Write a brief scenario that can be modeled with a linear equation. Summarize a situation modeled by a quadratic equation." Although I understand the difference between the two, I'm having a hard time creating problems that express them.

    asked by Nicole on March 4, 2010
  46. math

    can someone please help me i am lost. S this is kind of like your problems i can help you and you can help me *** the speed of the light in a vacuum is 299,792,458 meter per second which number, written in scientific notation, is the best approximation of

    asked by jas on April 5, 2018
  47. Algebra

    I am having problems with inequalities. How can I express this problem as one? Derek has $750 at the start of summer and spends $65 a week for expenses. How many weeks can he withdraw expenses and still have $250 at the end of summer.

    asked by Aria on May 7, 2011
  48. 6th grade

    Each letter in each questio stands for a 1-digit number. in each question, no two letters maystand for the same number. Two separate problems are unrelated.Find a value for each letter MOON Use Numbers 4,7,5,6,2.8,9,3 x AT ____ ACROSS

    asked by melissa on November 21, 2010
  49. calculus

    Can anyone walk me through the steps of solving either of these problems? 1)Determine the percentage of change of f(x)=e^0.9x at x=15 and x=30 2)For the demand function q=150(245-p^2), find E(p) and determine if the demand is elastic or inelastic (or

    asked by Sally on April 10, 2008
  50. math,algebra

    How do you solve these types of math problems. Directions: Solve each literal equation for the indicated variable. A=1/2h(B+b) (For b) Area of a trapezoid It is just a matter of algebraic manipulation. A=(1/2)h(B+b) Multiply both sides of the equation by

    asked by jasmine20 on December 18, 2006
  51. Trigonometry

    I am having problems with proving identities that has a number and an exponent with it. Like: *2cosxcsc2x = cscx *sin^2 2x = 4sin^2 x cos^2 x *cot2(theta)=csc(theta)-2sin(theta)/2cos(theta)

    asked by Jam on October 29, 2014
  52. Windows 7

    Is there anybody who understands the Windows 7 system and some of its problems? I'm having a tough time with Control Panel because it takes a REALLY long time to load, and it should load for a second. I may have to uninstall some programs and/or delete

    asked by AL 92 on December 13, 2010
  53. Math/Trig

    How would I evaluate these trig functions without using a calculator? U: sin(-13π/6) cot 11π/6 cot(-14π/4) sec 23π/6 Thanks in advance ^^; and if you'd tell me step by step on how to do problems like these I'd be grateful :D

    asked by Leah on June 11, 2012
  54. Algebra

    A meteorologist announces that yesterday’s high temperature was within 4° Celsius of 18° Celsius all across the country. Write an inequality that involves an absolute value to represent yesterday’s high temperature. Solve the inequality and explain

    asked by Fading on September 19, 2016
  55. Communication Studies

    Please Help! I need a rule of English grammar that has always caused people problems in English class (that is, a prescriptive rule)?

    asked by Carmin on January 18, 2010
  56. math

    I need help to justify my square root answer. I think if I could have an example that would help me with the rest of my homework. One of my problems is the square root of 31. thx.

    asked by Ashley on September 7, 2011
  57. college math

    find the slope of the tangent line to the graph of f at the given point. Graph f and the tangen line. 9. f(x) = 3x +5 at (1.8) 10. f(x)=2x + 1 at (-1,3) Please, help me with this problems. thanks

    asked by Dave on October 19, 2011
  58. Math-Calculus

    i have to questions that just need to be checked on to see if i got them right. Lim x-->infinity for both problems 10/x+10 is number one i got 0 for this one. or is it does not exist. lim x-->infinity 6x/6x+5 for this one I got One. (1) is that correct.??

    asked by Chelsey on March 23, 2010
  59. Calculus Indefinite Intergral

    I need help with integrating these two problems. Im stuck. 1. integrate (sin^-1)dx/((1-x^2)^3/2) sin^-1 aka arcsin 2. integrate dx/((1-x^2)^3/2) by using 1/z Any and all help will be appreciated!

    asked by John on April 22, 2015
  60. 4th grade

    Estimate the answers: a) 3 10/11 + 2 1/101 = Choose 4,5,6,or 7 b) 5 2/47 - 2 1/35 = Choose 2,3,4, or 5 c) 6 17/19 x 7 3/290 = Choose 42,49,63 or 213 I need to choose the best answer to this problems. Please help me with this. Thanks

    asked by Ili on November 30, 2009
  61. pHYSICS


    asked by fahad on November 15, 2008
  62. math

    How can I find the restrictions on the domain for this problem: f(x)=1/x. I have no idea how to find the range and domain for problems written like this.

    asked by Anonymous on April 2, 2008
  63. College Algebra

    I'm supposed to find a polynomial with specified Zeros. This is all the question told me: Degree: 4 Zeros: -2, 0, 2, 4 I know how to do these problems when it's a degree of 3, but not 4.

    asked by Ashley on April 19, 2010
  64. math

    Needing help with these problems lost, subtract. simplify if possible 3/x-9 - 3/ 9-x, divide and simpliify 6/t divide 18/t, add. simplify is possible 5/z-8 + 12/(z-18)^2

    asked by shelly on May 23, 2009
  65. civic education

    enumerate and discuss five local civic problem s. critically discuss five global civic problems

    asked by Adeyemo Joy on March 8, 2019
  66. Calculus

    What would the limit be for the following problems? lim (square root (x+3)) x--> 1 I thought it would be 1.4 lim (1/x) x--> 7 I thought it would be 0 or .1 but neither of those show to be correct. Thank you!

    asked by Serena on August 22, 2015
  67. Math

    Write two different multiplication problems that use the factors 4 & 5. Make one problem about arrays. Make the other problem about TIMES AS MANY.

    asked by Shaan on September 13, 2012
  68. physics/ conversions

    Please check these problems. 1. 92 X 10^3 km ---> dm My answer: 9.2 X 10^8 dm 2. 5.52 X 10^8 g ---> kg My answer: 5.52 X 10^11 kg 3. 8.66 X 10^-9 m ---> mm My answer: 8.66 X 10^-12 mm 4. 1 um ---> m My answer: 1 X 10^-6 m Thanks. 1 and 4 are correct. No so

    asked by Anonymous on September 21, 2006
  69. Chemistry

    Calculate the freezing point depression and osmotic pressure at 25 degrees C of an aqueous solution of 1.0 g/L of a protein (mol wt= 90,000) if the density of the solution is 1.0 g/mL. I know how to calculate freezing point depression and osmotic pressure,

    asked by Jessica on March 24, 2007
  70. Chemistry-DrBob222

    I know I pored this already, but I for it to mention the assumption. See below. A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X

    asked by Student on March 11, 2016
  71. American Government

    The Constitution establishes rules that the United States government must observe. There are five main principles that form the basis of these rules and ensure our democratic government. In a minimum of three well-developed paragraphs, list, define, and

    asked by Cheryl on October 22, 2010
  72. Math

    I seem to be having problems setting up Linear Programming questions. For example: Kustom Kars does van conversions. The Custom conversion required 15 hours of shop time, 8 hours of painting time, and 1 hour of inspection time. The Deluxe conversion

    asked by Matt on March 23, 2008
  73. Chemistry

    Chalk is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. Calcite is calcium carbonate, CaCO3. It forms under relatively deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths)

    asked by Shell on May 19, 2011
  74. Chemistry

    Calculate pH of a solution by mixing 15.0 mL of .50 M NaOH and 30.0 mL of .50 benzoic acid solution (benzoic acid is monoprotic, its dissociation constant is 6.5 x 10^ -5). I am not sure whether I am supposed to do it by acid-base titration way or to use

    asked by Soojung on July 28, 2009
  75. Chemistry

    The vapor pressure of 1 M of KI solution is ________ 1 M of glucose solution. This is because vapor pressure depends only on the _________. Which option correctly completes this statement? the same as; concentration of the solute less than; number of

    asked by Quinn on March 21, 2019
  76. Chemistry

    When an aqueous solution of lithium chloride is mixed with an aqueous solution of ammonium sulfate a precipitate forms a new salt is formed a gas is evolved an acid and base are formed no reaction occurs I either thought it was a precipitate forms or no

    asked by Lauren on December 11, 2007
  77. Chemistry

    If 36 g of potassium chloride are dissolved in 100mL of water at 40 C to form a saturated solution, how many grams of potassium chloride would be required to form a saturated solution in 250 mL of water at the same temperature?

    asked by Anonymous on May 26, 2010
  78. Chemistry

    I am trying to figure out how to make 275 gallons of a 5% NaOH solution. I know that 275 gallons weighs 2294.875 lbs. How many lbs. of NaOH woul it take to make the above mentioned solution?

    asked by Jay on August 27, 2012
  79. College Algebra 2

    for the following equation state the value of the discriminant and then describe the nature of the solution 11x^2+9x+11=0 What is the value of the discriminant? Which one of the statements below is correct? A. The equation has two imaginary solutions. B.

    asked by Lisa H on September 8, 2009
  80. english

    According to the strategies discussed in the lesson, when you have trouble making sense of what you have read, what is one strategy you can use? Share thoughts and questions with friends. Try not to overthink the problems you have. Read the same material

    asked by oscar on September 5, 2015
  81. math

    two crooks rob a bank and flee to the east at 66mph. In 30mins, the police follow them in a hellicopter. flying at 132mph. How long willit take for the police to overtake the robbers? I came up with 60mins. i don't think it right! please help with distance

    asked by ^^^^kesha on June 19, 2012
  82. behavior modification

    ellen was referred to the clinic shortly after her fake miscarriage who was employed as an admin assist. with mr johnson whom she had an affair with for 2 years and mr johnson was unwilling to divorce his wife because of his children. what issues do you

    asked by cheryl on July 5, 2009
  83. Algebra

    Totally confused and have 5 more problems like this. Can someone explain each step for these questions? Thanks! Let f(x) = e^x–2 + 3. (a) Describe in words how the graph of f can be obtained from the graph of y = e^x. (b) What is the domain of f? (c)

    asked by Audrey on July 28, 2009
  84. Trigonometry

    Express each of the following as a single logarithmic expression. All exponents must be left in radical form: 1.) 2logx-3logy 2.) logx-logy+logz 3.) 1/3log5x+2/3log6x 4.) 2/3(logbase2 x - logbase2 y) I don't understand these problems at all. Can someone

    asked by Nabil on May 19, 2012
  85. Pre-Algebra

    I'm stuck on these two problems; can someone show me how to solve them step-by-step? Thanks 1.A baseball diamond is a square 90 ft on each side. How far is it diagonally from home plate to second base? 2.An equilateral triangle has sides 10 units long.

    asked by mysterychicken on June 6, 2009
  86. social studies(CHECK 1 ANSWER)

    6. what could farmers do to address the problems created by deforestation? A. return to the system where the land belongs only to the wealthy. B.bring in animals that are disappearing from the ecosystem. C.Irrigate the land more often . D.develope new ways

    asked by Matt on January 22, 2014
  87. management

    Explain how each one of the following factors impact the four functions of management. In your explanation include specific examples of these impacts: 1) Globalization- 2) Technology- 3) Innovation- 4) Diversity- 5) Ethics- The paper is on walmart. I am

    asked by patiance on September 30, 2010
  88. Calculus

    Find the volume of the solid whose base is the region in the xy-plane bounded by the given curves and whose cross-sections perpendicular to the x-axis are (a) squares, (b) semicircles, and (c) equilater triangles. y=x^2, x=0, x=2, y=0 I know how to graph

    asked by Anonymous on December 15, 2007
  89. science

    identify at least seven different problems with the following reference and the re-write the reference in its proper form Gary Fisher, Alan Brady and Joan Lees. A study of On-Line Learning Styles. (2011). The journal of psychology, vol. 12, pp. 85 to 114

    asked by eid2013 on November 3, 2013
  90. inorganic

    Qualitative analysis studies require the use of a large number of chemical reagents, each of which must be treated with care. To illustrate this statement, list the reagents used to determine and confirm the presence of Ag+ ion in a sample, and describe

    asked by zagros on February 26, 2015
  91. Chemistry

    A saturated solution is prepared by adding excess PbI2(s) to distilled water to form 1.0L of solution at 25oC. The concentration of Pb+2 in the saturated solution is found to be 1.3*10-3 M. Calculate the Ksp for PbI2(s) in water at 25 °C R/

    asked by Samboni on December 22, 2014
  92. Chemistry

    I am very confused with this problem, i tried using the percent yeild but i got stuck. Can u help? The O'Keefe's have 75 gallons of cucumbers for pickling. The 1.5 M KOH solution costs $3.50 per liter, 9 M H2SO4 solution costs $8 per liter, and ethanol

    asked by Ingrid J. on October 13, 2010
  93. glucose monitors

    In my class, we have to research on glucose monitors and pick two disadvantages and find a way to solve those disadvantages. The teachers know the students are not expert on designing a new product but using creativity, we have to come up with solutions

    asked by kelly on October 9, 2007

    You carefully weigh out 20.00 g of CaCO3 powder and add it to 81.00 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 92.80 g . The relevant equation is

    asked by kaba on February 19, 2017
  95. Chemistry

    30g of the palm shell were mixed with 15ml H3PO4 and 100ml of distilled water in a 250ml conical flask.The concentration of H3PO4 solution was 2.2M, from question,how to prepare those from ortho phosporic acid (98g/mol).Do help me, is it need to make a

    asked by Merlina_Lyn on February 1, 2013
  96. math

    how do you solve for zero for this equation? (2/3)X -12 -(20/X^2) (2/3)X -12 -(20/X^2) = 0 --> 2/3 X^3 - 12 X^2 - 20 = 0 ---> X^3 - 18 X^2 - 30 = 0 Numerical solution: You see that for X = 18 the first and second term cancel, so the left hand side is -30.

    asked by Sam on January 17, 2007
  97. Chemistry

    Please read to the bottom - This help was wonderful and absolutely correct, I'm asking a bit more regarding the same question, please read below. Imagine that you have been asked to prepare 500ml of a 0.25 mol L solution of Sodium Hydroxide, NaOH. Describe

    asked by Dexter on October 15, 2010
  98. CHEM

    A metal, M, of atomic mass 91 amu reacts with fluorine to form a salt that can be represented as MFx. In order to determine x and therefore the formula of the salt, a boiling point elevation experiment is performed. A 9.05-g sample of the salt is dissolved

    asked by John on July 8, 2012
  99. Chemistry

    Determine the number of grams of NH3 produced by the reaction of 3.5g of hydrogen gas with sufficient nitrogen gas. All of these stoichiometry problems are work almost the same. Sometimes an extra step or two are required. Here are the basics. Step 1.

    asked by Sara on January 23, 2007
  100. CALC

    I am sorry i still don't know how to start. and i am sorry for the problem earlier..it wasn't my fault :( Note that the way students like you are asked to solve this and similar problems is usually not the way people like me solve such problems. It is a

    asked by URGENT PLZ on May 6, 2007