chemistry! URGENT

61,261 results, page 3

  1. Algebra 2 URGENT

    Simplify: (a-b)/(a^-1-b^-1)
  2. Algebra 2 URGENT

    Simplify: 1/y^2-y-2+1/y^2+y
  3. Algebra 2 URGENT

    Simplify: 4s^-2-(4t)^-2
  4. Algebra 2 URGENT

    Simplify: 1/u^2-2u-1/u^2-4
  5. Algebra 2 URGENT

    Simplify: x+2/x^2+x-2/2x
  6. urgent math

    solve 4(7^(x-2)) = 8
  7. MATH URGENT!

    SIMPLIFY: x^2-4x-3
  8. algebra 1 honors

    If r=5/3r+20/3, what is r? URGENT!!!!
  9. Math URGENT!!!

    -32=8/7(3w - 1) Find w.
  10. Math URGENT

    3.8y+4/7x+2=0 Please help me. Thanks
  11. maths

    2x+5=x+9 urgent help needed
  12. Urgent math help

    what is the x intercept y = -5x+20
  13. Urgent Math! Please Help!

    2^-4 = -2 * -2 * -2 * -2 =16
  14. analytical chemistry

    a 0.4617g sample containing sodium bicarbonate was dissolved and titrated with standard 0.106M of hydrochloric acid solution , requiring 40.72ml. the reaction is: HCO3- + H+ -> H2O + CO2 Calculate the percent sodium bicarbonate in the sample. (Given molecular weight of ...
  15. This needs tobe turned in in 10min AT MOST URGENT!

    1. x over 5= –2 (1 point) –45 35 –10 21 2. 13x – 7 = 136 (1 point) 11 15 8 9 3. Solve the following equation: 3x – 3 = 15 (1 point) 4 5 6 7 4. Ernesto loses 14.5 pounds in 7 months. Now he weighs 156.5 pounds. Which equation can be used to find how much he weighed ...
  16. chemistry urgent

    a mixture of NO, CO2, and O2 gases has a total pressure of 2.5x10^3 torr. if the partial pressure of NO is 800 torr and CO2 is 600 torr, what is the partial pressure of O2? Dr. Bob. Please help
  17. Algebra 2 URGENT

    Simplify: 2x+5/4x^2 + 2x-5/10x
  18. Algebra 2 URGENT

    Simplify: 2x+5/4x^2+2x-5/10x
  19. science PLEASE HELP URGENT:(

    how do i convert 4 g/ml to kg/m^3 ?
  20. ALGEBRA 2 URGENT! PLEASE HELP!

    Simplify 8(2^x-1)=64
  21. HELP! URGENT!

    What is the pH of a 0.030M solution of KF? Ka of HF is .2 x 10^-4. THNX!
  22. Math Urgent

    Evaluate 2 ∫ |x+1| -3
  23. Math please help urgent !

    y= u+3/u-1 u=x^1/3 find dy/dx at x=8
  24. ALGEBRA 2 URGENT

    6x/x-8 - 7x/x-1 = 5/x(2)-9x+8 / is fraction (2) is squared
  25. Math URGENT!

    2. 9X-2=34+3X 4.x/3-15=12+x 6.11+4x=7+5x 8.-7+x=-8-x 10.0.45x+25=40+0.25x
  26. URGENT MATH

    Find h(t) + k(t) if h(t) = {(-4,5), (-2,-3), (0,5), (1,3), (3,-1), (5,5)} and k(t) = {(-3,-2), (-2,6), (-1,0), (1,0), (2,-6), (3,5), (4,0), (6,-2)}. (2 marks)
  27. CALCULUS HELP URGENT!!

    find y' if arctan(xy)=6+x^(4)y
  28. math URGENT thx

    what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2
  29. math(urgent)

    if x+ y is 25 more than x-y then x is what percent of y ?
  30. calculus(urgent pls)

    Integral of 1/[x^2(1+x^2)]
  31. maths. It's urgent

    solve for the value of x and y. X+y=15 x^y+y^x=30
  32. Chemistry URGENT

    I'm filling out those missing value charts with atomic numbers, protons, charge, etc. The info i've been given is protons (4), neutrons (5), electrons (2). I got 4 for th eatomic number, and 2 for the charge. The problem is the atomic mass. Once I got 6, the other time I got 9...
  33. Chemistry -pls help urgent

    1) How do I prepare 2M nitric acid from 65% concentrated nitric acid? 2) How do I prepare 17% ammonia from 25% concentrated ammonia? Please show calculation steps. Thanks.
  34. Urgent Chemistry

    The diffusion current for a standard is 1 x 10^-4M solution of hydroquinone is 17.5 microamperes. An unknown solution of hydroquinone, when diluted hundred folds and polarographed under same conditions yielded a current of 30.5 microamperes. Calculate the concentration of ...
  35. CHEMISTRY: URGENT DRBob222

    Why was the reaction mixture titrated quickly? (question fom: A mixture of 0.50 mol of ethanoic acid and 1.00 mol of ethanol was shaken for a long time to reach equilibrium. The whole mixture was titrated quickly with 1.00 mol dm3 sodium hydroxide and 80cm3 of alkali were ...
  36. English

    Original sentence: The urgent care center offers a variety of services such as physician appointments, mental health, health education programs, and lab and X-ray work. My corrections: The urgent care center offers physician appointments, mental health evaluations, health ...
  37. Chemistry URGENT PLEASE PLEASE PLEASE HELP!

    Determine whether the solution is basic, acidic, or neutral. Write net ionic equations to show how it behaves in aqueous solutions. 1) Fe2(SO4)3 I know it is acidic Do I do hydrolysis equations for the net ionic or do I do redox reactions?
  38. Chemistry

    A solid metal is often known as having 'an array of positive ions in a sea of electrons'. Write down the electronic structure of magnesium atom and use it to explain what this phrase means. Actually I don't know how to explain it. So I need you to explain it in your own words...
  39. Quick Question (URGENT)

    What does this symbol mean (#) thank you
  40. Pre-calc-urgent

    How do you find a formula for f(x) and g(x) if h(x)=f[g(x)] h(x)=(2x^3-5)^4
  41. MATH

    HOW TO SOLVE THIS? ã8(ã10-1) PLEASE IT IS URGENT !!!!
  42. ALGEBRA 2 URGENT! PLEASE HELP!

    Simplify (10x^2-6x-x^3)+(9x+x^3+5x^2)
  43. maths

    this is urgent y=1/2x - 1 if x equals 4 what does why equal? please help
  44. maths

    how do you get 45 percent of something urgent thankyou
  45. Math(urgent!!)please!

    3/4(2x-1)-5 is equal or greater than 5/4(x-3)
  46. URGENT math

    (x-1)(x+3)-6=0 Solve by quadratic formula.
  47. Integers (urgent)

    For what integer values of x is x+1-2 positive?
  48. Algebra 1--Please, help me! This is urgent!

    Solve each equation. 1). 4/5y + 1/3 <= -y 2.) 4/5h => -2
  49. Math! URGENT

    Solve the inequality -5p>-30 A. p>6 B. p<6 C. p>-35 D. p<35 Is the answer B?
  50. Math-urgent-

    What's 11/12 divided by 3/4 in repeated subtraction?
  51. Maths (URGENT!!!)

    2).Find the sum to n terms of 1/(1.2.3) + 3/(2.3.4) + 5/(3.4.5) + 7/(4.5.6)
  52. math too urgent

    how to construct 75 degree angle
  53. math urgent

    Tan20+4sin20=√3
  54. HELP THIS IS URGENT!

    HOW MANY OZS IS IN 100 LBS? PLZ HELP ME!
  55. Chemistry URGENT

    can someone please tell me what formula's to use for the 2 following chemistry problems. 1. Calculate the solubility of potassium bromide at 23 degrees Celsius. hint. Assume that the solubility increases by an equal amount for each degrees between 20 degrees C and 30 degrees C...
  56. chemistry

    silver iodide powder has been used as and antiseptic and as and agent to seed clouds for rain . silver iodide is 45.9% silver by mass . if you separtate a 50-g sample of silver and iodide , how much iodide is into its elements, silver and iodide how much silver would you have...
  57. Chemistry - urgent

    The following is part of a procedure for a limit test for sulphates in an NaOH sample:- Dissolve 3.0g of NaOH in 6ml of deionized water, adjust to pH 7 with HCl (approx.7.5ml) and dilute to 15ml with deionized water. Please explain how to perform this procedure. Conc HCl or 1M...
  58. Social Studies (URGENT)

    Okay,I need to create a newsletter on the olden days. The year is 1599 and I have to write 3 paragraphs on 3 different people. 1 play review, 1 song review and 2 editorials. I am currently writing about: Paragraphs: - The Battle of Curlew Pass (Red Hugh O'Donnell) - The grand ...
  59. chemistry final-urgent

    Choose the element with the highest ionization energy element: Na, Mg, Al, P, S In my book: ionization energy increase from left to right and bottom to top. Na<Mg<Al<P<S S is highest ionization energy? my instructor review this problem and his answer is P is a ...
  60. Chem Urgent!

    What is the number of grams for 1 mol lead?
  61. Richard

    Please answer "Physics - URGENT" below.
  62. Math(urgent)

    Find the domain of the function. s(y)= 3y over y+5
  63. US HISTORY THIS IS URGENT!!

    WHAT WERE THE PEOPLE OF MASSACHUSETTS LIKE IN THE 1620S?
  64. Algebra 2 URGENT

    Solve each open sentence. x-5/9<or=to2x/15-2/5
  65. Algebra 2 URGENT

    Simplify cubed root of 135
  66. Algebra 2 URGENT PLEASE HELP

    Solve. Square root of 3x+4=x
  67. urgent precal

    What is cosx/ (secx-1) not in fractional form?
  68. College Algebra URGENT

    f(x)=1/(x+4) g(x)1/(6x+4) what is f(composed)g(x) if x does not equal -4/6 please help me
  69. English! URGENT PLEASE HELP!

    Sentence for the word BEATIFICALLY?!?
  70. Algebra (URGENT)

    Put this into function form: 2x+5y=20 Thanks!
  71. Math-URGENT!!!!

    write the parametric equations of -3x+1/2y=2/3. please help me!!!
  72. math URGENT

    please factor 2.75x^2-7x-120
  73. Urgent ~ Math

    3(x – 4) = 5(x + 2) (1 point) x = 11 x = –11 x = 1 x = –1 I think this is 11 am i correct or am i wrong?
  74. math very urgent

    What is the area of a shape that that has 8 sides and has 1 , 1 , 8 , 1 , 1 , 3 , 3 and 10?
  75. maths- urgent

    show that √Π+1 is irrational
  76. maths- urgent

    what is the value of sin18degree-sin66degree+(root3/2)
  77. ALGEBRA HELP! URGENT!

    FACTOR: 36x^2+132xy+121y^2
  78. urgent heeeelp!

    Divide: -39x^4 by underroot13 multiplied by x^2
  79. Math- urgent

    1/2 (8-6h)=h what does h equal? Please show your work.
  80. Math- urgent

    X-30=14-3x What does x equal? Please show your work.
  81. Math- urgent

    X+4÷7=-2 What does x equal? Please show your work.
  82. Math- urgent

    -3 (x-8)+7x=12 What does x equal? Please show your work.
  83. Math- urgent

    Solve for x. x+4 (x+3) =17 Please show your work.
  84. Math- urgent

    Solve for x. 8x-(8+6x)=20 Please show your work.
  85. Math- urgent

    How can -2.65 be written as the ratio of two integers?
  86. Math- urgent

    Z/2-6=4 What does z equal? Please show your work.
  87. English - Very urgent

    How does pearls represent hope?
  88. Science - Urgent.

    What is a electrostatic lifting apparatus? Please help..
  89. Mathw(URGENT pls)

    Find the sum to n terms of 1/(1.2.3) + 3/(2.3.4) + 5/(3.4.5) + 7/(4.5.6)
  90. Maths(URGENT pls!!!)

    Find the sum to n terms of 1/(1.2.3) + 3/(2.3.4) + 5/(3.4.5) + 7/(4.5.6)
  91. math urgent

    Prove : Tan20+4Tan20=√3
  92. adv functions urgent

    any math teachers around?
  93. urgent!

    What is the approximate size of an amino acid's backbone?
  94. Algebra II

    What is the sum of the geometric series 12 E 2(1/2)^x x=0 4 0 2 3 PLEASE HELP Urgent
  95. character education

    what is the difference between important and urgent?
  96. URGENT! chemistry- percentage yield

    heating an ore of antimony sulfide in the presence of iron gives th element antimony and iron(2) sulfide. when 15.0 antimony sulfide reacts with an excess of iron, 9.84 g antimony is produced. what is the percent yield of this reaction?
  97. Chemistry (URGENT)

    Calculate the molarity of the Co^2+ ion in each of the solutions 1-5. The new molarity is given by the molarity of the stock solution multiplied by the dilution factor. Solution: Co(NO3)2 Original molarity: 0.160 Dilution #1: none D#2: 12mL to 16mL D#3: 8mL to 16mL D#4: 4mL to...
  98. chemistry--URGENT, PLEASE HELP

    What concentration of silver chromate (Ksp = 9.0 x 10-12) will dissolve to make a saturated solution in water? *For this one the formula is Ag2CrO4, which is [Ag]^2[CrO4]. I plugged x in for CrO4, so x^3 is equal to Ksp. I then got that x = 2.0e-4. However, that x is for CrO4...
  99. URGENT -- Chemistry

    When 0.500 g of an unknown compound was dissolved in 15.0 g benzene, the freezing point depression was determined to be 0320C. The molar mass of the unknown compound is ?? g/mol. (The freezing point depression constant for benzene is 5.12C kgmol. I really don't know where to ...
  100. calculus urgent

    If you are given a graph of a function, how do you draw the derivative?
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