lt

Most popular questions and responses by lt
  1. Chemistry

    During the electrolysis of an aqueous solution of CuSO4 with inert electrodes (A) the anode loses mass and the cathode gains mass. (B) the mass of the anode remains the same but the cathode gains mass. (C) the mass of the anode decreases but the mass of

    asked on May 12, 2008
  2. Chemistry

    If two salts AX and BX2, have the same Ksp values of 4.0x10^-12 at a given temperature, then A. their molar solubilities in water are the same B. the salts are more soluble in 0.1 M NaX than in water C. the molar solubility of AX in water is less than that

    asked on April 14, 2008
  3. Chemistry

    what is the molar solubility of lead sulfate in 1.0 X 10^-3 M Na2SO4? The Solubility Product Constant PbSO4 Ksp= 1.8 x 10^-8 The Ksp expression is: Na2SO4 = [2Na][SO4^-2] [2Na]=2x [SO4^-2]=x Ksp= 1.8 x 10^-8 = (x)(2x) Ksp= 1.8 x 10^-8 /4x^3 1.8 x 10^-8/4 =

    asked on April 14, 2008
  4. Chemistry

    a solution saturated in calcium hydroxide(limewater) has a pH of 12.35. What is Ksp for calcium hydroxide? How do i start this problem. please

    asked on April 10, 2008
  5. Statistics

    The International Olympic Committee states that the female participation in the 2000 Summer Olympic Games was 42%, even with new sports such as weight lifting, hammer throw, and modern pentathlon being added to the Games. Broadcasting and clothing

    asked on October 29, 2007
  6. Chemistry

    If the concentration of a saturated solution of SrCO3 is 0.000040 mol*L^-1, what is the value for the solubility product constant of this salt. How do I start this please

    asked on April 14, 2008
  7. Chemistry

    The dissociation for a weak base BOH in water found to be 1.25 x 10^-6. What is the concentration of H+ in a 3.2M soluton of BOH.

    asked on April 14, 2008
  8. Statictics

    6. In 2000, the United Nations claimed that there was a higher rate of illiteracy in men than in women from the country of Qatar. A humanitarian organization went to Qatar to conduct a random sample. The results revealed that 45 out of 234 men and 42 out

    asked on October 29, 2007
  9. Chemistry

    Fill a balloon with helium gas to a volume of 2.68 L at 23 celsius and 789mmHg. What would the volume of helium if the pressure changes to 632 mmHg but the temperature is unchanged. This is how I solved it V2 = V1 X P1/P2 2.68L X 23/789 = V2 =.078 L Is

    asked on October 21, 2007
  10. statistics

    A company claims to have invented a hand-held sensor that can detect the presence of explosives inside a closed container. Law enforcement and security agencies are very interested in purchasing several of the devices if they are shown to perform

    asked on November 5, 2007
  11. Chemistry

    Fill a balloon with helium gas to a volume of 2.68 L at 23 celsius and 789mmHg. What would the volume of helium if the pressure changes to 632 mmHg but the temperature is unchanged. This is how I solved it V2 = V1 X P1/P2 2.68L X 789/632 = ANSWER V2 =.3.35

    asked on October 23, 2007
  12. Stats

    The countries of Europe report that 46% of the labor force is female. The United Nations wonders if the percentage of females in the labor force is the same in the United States. Representatives from the United States Department of Labor plan to check a

    asked on October 31, 2007
  13. Chemistry

    What is the pH of a buffer solution that is 0.15 M propionic acid and 0.20M sodium propionate? How do I start this problem

    asked on April 1, 2008
  14. Chemistry

    What is the OH^- concentraton of a solution that is 0.10M in Na2C2O4? I have a couple of these concentration questions asking different things but I don't know how to do them

    asked on April 14, 2008
  15. STATISTICS

    It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. a. Describe the sampling distribution for sample proportion by naming the model and telling its

    asked on October 30, 2007
  16. Chemistry

    Manganese has the oxidation number of +5 in ______ . . (A) [MnF6]3– (C) [MnO4]2– (B) Mn2O7 (D) [Mn(CN)6]–

    asked on May 12, 2008
  17. Elementary Statistics help

    It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. a. Describe the sampling distribution for sample proportion by naming the model and telling its

    asked on October 29, 2007
  18. Chemistry

    Enough water is added to 0.35 g of benzoic acid to make 1000 mL of solution. What is the pH? Ionization Constant for Benzoic Acid Ka = 6.5 × 10–5 Molar Mass Benzoic Acid 122. g·mol–1 (A) 1.9 (B) 2.6 (C) 3.4 (D) 4.2

    asked on April 15, 2008
  19. Chemistry

    What is the molar concentration of silver ion in a solution containing 1.3 × 10–4 M CrO42–, saturated with Ag2CrO4? The Solubility Product Constant, Ksp for Ag2CrO4 is 9 × 10–12 (A) 1.3 × 10–16 (B) 7 × 10–16 (C) 9 × 10–12 (D) 2.6 × 10–4

    asked on April 15, 2008
  20. Stats

    5. The board of directors for Procter and Gamble is concerned that only 19.5% of the people who use toothpaste buy Crest toothpaste. A marketing director suggests that the company invest in a new marketing campaign which will include advertisements and new

    asked on October 31, 2007
  21. Chemistry

    What is the pH of a buffer solution that is 0.20M methylamine and 0.15 M methylammonium chloride. which do i get the pH of

    asked on April 2, 2008
  22. Chemistry

    Which statement is true for the cell as it discharges? Zn | Zn2+(1 .0 M) || Sn2+(1.0 M) | Sn (A) Oxidation occurs at the tin electrode. (B) Electrons will flow from the tin electrode to the zinc electrode. (C) The concentration of Zn2+ will increase. (D)

    asked on May 12, 2008
  23. Chemistry

    Equal volumes of 1 M BaCl2 and 1 M NaSO4 are mixed. What effect will the addition of more Na2SO4 solution have on the concentration of Ba^2+ remaining in solution? *No effect *increase the concentration of Ba^2+ ions *Decreases the concentration of Ba^2+

    asked on April 14, 2008
  24. Chemistry

    Which reaction will occur if each substance is in its standard state? (A) Ni2+ will oxidize Sn2+ to give Sn4+ (B) Sn4+ will oxidize Br– to give Br2 (C) Br2 will oxidize Ni(s) to give Ni2+ (D) Ni2+ will oxidize Br2 to give Br–

    asked on May 12, 2008
  25. business

    . Theory and origin of the separation of powers II. The division of powers among the branches of government A. The executive branch B. The legislative branch III. The separation of church and state IV. The judicial branch V. Current ideas about the

    asked on May 6, 2010
  26. Statistics Help Please

    How do I tell if this is a mean or a proportion 1. Insurance companies track life expectancy information to assist in determining the cost of life insurance policies. The insurance company knows that, last year, the life expectancy of its policyholders was

    asked on November 12, 2007
  27. statistics

    5. There is some indication in medical literature that doctors may have become more aggressive in inducing labor or doing preterm cesarean sections when a woman is carrying twins. Records at a large hospital show that of the 43 sets of twins born in 1990,

    asked on November 5, 2007
  28. Chemistry

    For there reaction system involving the species in the table below, what conclusion is justified for standard state conditions? Standard Reduction Potentials E0 2Fe3+ + Sn2+ ¡ú 2Fe2+ + Sn4+ +0.62 V Sn2+ + I2 ¡ú Sn4+ + 2I¨C +0.38 V (A) I¨C would react

    asked on May 13, 2008
  29. English / Literature

    Choose one archetype that is illustrated by two or more of the stories you have read, and write a brief essay explaining what an archetype is, what archetype you’ve chosen to discuss, and how the archetype is demonstrated in at least two different pieces

    asked on June 23, 2011
  30. Math

    A candy bowl contained 723 candies. Some of the candies were red and the rest were green. There were twice as many green candies as red candies. How many red candies were in the candy bowl? Write an equation to solve this problem.

    asked on November 17, 2010
  31. Math

    a long distance phone company charges $3 for a phone call plus $0.75 for each minute of the call. What !@#$%^&tion does this situation give rise to? Find the formula and make a table for this function.

    asked on November 17, 2010
  32. Chemistry

    Which one of the following salts is obtained by the reation of a weak acid with a strong base. MgCl2 NH4F LiClO4 NaCl K2SO3

    asked on April 14, 2008
  33. Statictics

    2. Herpetologists (snake specialists) found that a certain species of reticulated python have an average length of 20.5 feet with a standard deviation of 2.3 feet. The scientists collect a random sample of 30 adult pythons and measure their lengths. In

    asked on October 29, 2007
  34. Help

    The countries of Europe report that 46% of the labor force is female. The United Nations wonders if the percentage of females in the labor force is the same in the United States. Representatives from the United States Department of Labor plan to check a

    asked on October 29, 2007
  35. Math

    Sarah spends 2/5 of her monthly income on rent. Sarah's rent is $750. What is sarah's montly income? Write an equation to solve this problem.

    asked on November 17, 2010
  36. Chemistry

    In the chemical reaction, . Zn(s) + CuSO4(aq) ¨ ZnSO4(aq) + Cu(s), (A) metallic zinc is the reducing agent. (B) metallic zinc in reduced. (C) copper ion is oxidized. (D) sulfate ion is the oxidizing agent.

    asked on May 12, 2008
  37. Statistics

    1) Find the missing parameter 1.mean 15, 30.15 %, above 50; what is the standard deviation 2.mean 75, 5.05% below 30; what is the standard deviation 3.standard deviation 9, 85.08% below 105: what is the mean 4.standard deviation 16.8, 15.62% above 18.3:

    asked on October 17, 2007
  38. Possessive form

    Cross out each incorrect possessive noun. Write correct possessive form. .......Small acts of kindness made the outcast's lives better. Answer Cross out outcast's Replace outcasts'

    asked on January 14, 2016
  39. MATH

    The sum of the squares of two numbers is 2. The product of the two numbers is 1. Find the numbers. xy=1 x^2+y^2=2 x^4+1=2x^2 x^4-2x^2+1=0 I don't think you can factor that unless its (x^2+1)(x^2-1) but I don't know where to go from there

    asked on May 12, 2009
  40. Chemistry

    How do i write a good discussion/conclusion for a lab report.

    asked on May 4, 2008
  41. English

    Is the word humor abstract or concrete

    asked on September 15, 2015
  42. Math

    How do I solve: log6 (x^2-5x) = 1 1/2log5(r-2)-log5 r) log2 (x-1/x^8) I really don't know how to do these or even start

    asked on March 16, 2009
  43. Chemistry

    Which process represents a general method for the preparation of a metal from its compounds? . (A) neutralization (D) fusion (B) reduction (E) sublimation (C) oxidation

    asked on May 12, 2008
  44. Chemistry

    Free sulfur may act as either an oxidizing agent or a reducing agent. What is the best experimental evidence for this statement? (A) Sulfur forms sulfur dioxide as well as calcium sulfide. (B) Sulfur is a nonmetal. (C) Sulfur forms both organic and

    asked on May 12, 2008
  45. Statistics

    Can someone help me start this please: There is some indication in medical literature that doctors may have become more aggressive in inducing labor or doing preterm cesarean sections when a woman is carrying twins. Records at a large hospital show that of

    asked on November 23, 2007
  46. Math

    Describe how this could happen that three different animals could each be claimed - rightfully - to be the largest of the three. Discuss the implications of this kind of situation for teaching students about measurement.

    asked on November 15, 2010
  47. PE

    Why is it important to know an accurate VO2 max value when prescribing exercise?

    asked on February 7, 2009
  48. Chemistry

    The ionization constant of an acid, HX is 1 x 10^-5. When a mixture of 0.100 mol HXand 0.100 mol of NaX is diluted to a volume of one liter by addition of wate, the pH of the resulting solution is very nearly a. 7 b. 6 c. 5 d. 4

    asked on April 15, 2008
  49. Chemistry

    How do you calculate the pH, pOH, [H3O] and [OH] for a 0.067 M solution of sodium iodate

    asked on April 14, 2008
  50. Chemistry

    The pH of a 1.0 x 10^-3 M Ba(OH)2 solution at 25 degrees C is how can 11.3 be the right answer.

    asked on April 2, 2008
  51. Writing Assignment

    I have to write a short essay on a movie called the seventh seal and I was wondering about a certain part that interested me and that would be where he is playing chess with death can any one give me some help with this... like what does it mean... and ect

    asked on February 24, 2008
  52. Grammar

    What does personal , reflexive ,and intensive mean

    asked on September 15, 2015
  53. Math

    2 square root -50 + 5 square root -32 i got 30i square root 2 is this right

    asked on March 3, 2009
  54. Math

    (square root of x+7)-5 = x Only the x+7 is square rooted how do I find the solution set???

    asked on February 3, 2009
  55. Chemistry

    In every electrolytic and galvanic (voltaic) cell the anode is that electrode (A) at which oxidation occurs. (B) which attracts cations. (C) at which electrons are supplied to the solution. (D) at which reduction occurs.

    asked on May 12, 2008
  56. Dr. Bob Chemistry question

    Ok this is what i got for the grams part now.... Total mass is 20.14 + 51.64 + 11.34 + 15.06 = 98.18 %H2O = (20.14/98.18)*100 = 20.51% %C2O4 = (51.64/98.18)*100 = 52.60% % Fe 3+ = (11.34/98.15) * 100= 11.55% % K + = (15.06/98.15) * 100 = 15.43 % 20.51 g

    asked on May 5, 2008
  57. Question for a Teacher

    Are any of you a teacher... I have an important question that has to a teacher

    asked on April 22, 2008
  58. PreCalc

    write in interval notation 2x^2 < or = 9x+5

    asked on December 12, 2007
  59. PreCalc

    Solve the system by the addition method -10x^2 + 10y^2-320=0 30x^2 + 6y^2 - 336 = 0

    asked on December 11, 2007
  60. SCIENCE

    describe the preparation of 100mls of 1,0M from concentrated HCL?

    asked on April 11, 2012
  61. MATH

    y = sin (x - Pi sign) amplitude: period: phase shift:

    asked on April 14, 2009
  62. Math

    Solve the polynomial inequality x^2+5x >or= -6 (-infinity, -3]u [-2, infinity) or [-3,-2]

    asked on March 3, 2009
  63. Reading

    My teacher is asking me to "Create a two-part answer for the concepts below" what is a two part answer

    asked on January 25, 2009
  64. Math

    how do i find the height of a triangle the base is 18 inches, the angled side is 82 inches and it is a right triangle

    asked on May 19, 2008
  65. Anthropology

    Create at least two arguments each pro- and contra the establishment of a Global Culture does any one know about global culture or what it is

    asked on May 7, 2008
  66. Chemistry

    All of the following species would be expected to be able to function a Lewis bases EXCEPT a. F- b. O2- c. OH+ d. H2O BF3

    asked on April 14, 2008
  67. PreCalc

    Solve for the variable m^2 + 2m +3 > = 0

    asked on December 12, 2007
  68. Statistics

    What if my p value is below 0.05 does it reject or fail the null hypothesis

    asked on November 17, 2007
  69. Latin

    Quid est Quintus?

    asked on September 15, 2015
  70. english

    What does Thomas Paine value highly in the excerpt from his essay “The Crisis”? Freedom Solitude Individuality Spirituality Equality

    asked on September 30, 2009
  71. MATH

    x+y=-4 (x-2)^2+(y+7)^2=13 solve by substitution

    asked on May 12, 2009
  72. exercise

    What specific recommendations would you give on fuel selections and hydration to successfully run a 10 K race

    asked on April 16, 2009
  73. Math

    Solve the polynomial equation, to obtain the first root. x^3+7x^2+19x+13 and 2x^4-19x^3+74x^2-127x=0 I don't know how to start these, or finish them

    asked on March 3, 2009
  74. Math

    x/x+3 > or equal 2 (-3,6] or [-6,-3) or does it have an infinity in the answer

    asked on March 3, 2009
  75. Math

    How do I figure these 2 out. Find standard form a +bi (4 square root -9) ( -3 square root -5) x^2 -3x+4 evaluated for x=1+i

    asked on March 1, 2009
  76. Math

    Determine whether the function x^3+x^2-1 is even, odd or neither. I thought it was odd because it has one negative sign is this correct

    asked on February 22, 2009
  77. Math

    Find all values satisfying x f(x) 3x-1 g(x) x^2-5x+12 (f*g)(x) = 17

    asked on February 17, 2009
  78. Math

    (X+1)/2 = 4 - (X+2)/7

    asked on February 3, 2009
  79. Math

    If the ratio of two pulleys, A and B is 4:3, and pulley B has a length of 13.5 inches, how long is pulley A? [a] inches how do i figure this

    asked on May 16, 2008
  80. Chemistry

    Dr. Bob ok well here is what i have gotten so far: on the problem H2O: 1.118 mol C2O4: .58681 mol Fe 3+: .2025 mol K^+: .3862 mol That is what ive gotten doing 20.14 g(1 mol / 18 g) = 1.118 mol and so on with the rest of them Did i do that wrong

    asked on May 4, 2008
  81. Chemistry

    How do I find the percent composition of H2O: 20.14grams C2O4: 51.64grams Fe 3+: 11.34grams K^+: 15.06 grams and the empirical formula with these numbers

    asked on May 4, 2008
  82. Chemisty

    Ok this is what i got for the grams part now.... Total mass is 20.14 + 51.64 + 11.34 + 15.06 = 98.18 %H2O = (20.14/98.18)*100 = 20.51% %C2O4 = (51.64/98.18)*100 = 52.60% % Fe 3+ = (11.34/98.15) * 100= 11.55% % K + = (15.06/98.15) * 100 = 15.43 % 20.51 g

    asked on May 4, 2008
  83. Anthropology

    what is an Incipient Civilizations

    asked on April 24, 2008
  84. PreCalc

    How do i solve for the variable 3x= sqrt5x+1

    asked on December 12, 2007
  85. Graphing

    what are outliers and influential points in graphs dealing with data

    asked on December 8, 2007
  86. Linear or nonlnear

    how do i tell if my graph is linear or nonlinear...

    asked on December 8, 2007
  87. Statistics

    does anyone know how to do statistics

    asked on November 23, 2007
  88. Statistics

    How do you tell if the null hypothesis rejects or fails?

    asked on November 17, 2007
  89. chemistry

    convert 0.0840 mol to liters ??? is it 1 liter over 1 mol

    asked on October 21, 2007
  1. Maths

    sorry I meant 10

    posted on March 11, 2019
  2. Maths

    2

    posted on March 11, 2019
  3. Grammar

    Thx

    posted on September 15, 2015
  4. Grammar

    Please help me

    posted on September 15, 2015
  5. English

    Thank you so much

    posted on September 15, 2015
  6. English

    Thx I had that 2

    posted on September 15, 2015
  7. Math

    Doesnt i^2 equal -1

    posted on March 1, 2009
  8. Math

    For the second one i got 1+3i is this correct

    posted on March 1, 2009
  9. Math

    is the answer 5 thats what i got

    posted on February 3, 2009
  10. Math

    i don't have the height would i use 82 the slanted side

    posted on May 19, 2008
  11. Math

    x = 6.7

    posted on May 19, 2008