# why does the equation x^2=-9 has no real solution why does the equation x^2 = 9 has two solutions

56,329 questions, page 550
1. ## english -final revision

According to my experience, the easiest part of the writing process was the brainstorming, which allows me to outline a large numbers of ideas in order to find the best solution before starting the process. The most difficult part was finding the thesis

asked by rose on April 2, 2008
2. ## physical science (light)

1. An object 5 millimeters high is located 15 millimeters in front of a plane mirror. How far from the mirror is the image located? A. 5.0 millimeters B. 7.5 millimeters C. 15 millimeters *** D. 30 millimeters 2. Which of the following values represents an

asked by Mari on June 10, 2010
3. ## Chemistry

Why does the addition of 50ml of 0.5M NaOH to 50mL of 0.6M KOH cause the pH to decrease (aka more acidic)? Because you have reduced the (OH^-) of the 0.6 M KOH by adding an equal volume of 0.5 M NaOH 50 mL x 0.6 M KOH = 30 millimols. pH = 13.78 Adding 50

asked by Vic on August 21, 2007
4. ## Math

**The topic is exponents** A candy maker is making taffy. He starts with one long piece of taffy and cuts it into 3 pieces. He then takes each resulting piece and cuts it into three pieces. He then takes each of these resulting pieces and cuts it into

asked by Nikko on February 21, 2018
5. ## Finance

Your firm purchased machinery for \$10 million. The machinery falls into asset class 38, which has a CCA rate of 25 percent. The project will end after 5 years. If the equipment can be sold for \$4 million at the completion of the project and your firm's tax

asked by A on November 23, 2007
6. ## economics

The demand function for a well known economics textbook is: P = 100 - .005Q The publisher must pay \$20 per book in printing and distribution costs and, in addition, it must pay the author a \$20 royalty for each book sold. (a) Your job is to provide advice

asked by tinky on October 13, 2006
7. ## Chemistry

Hello, I would greatly appreciate some help with the following problem, as I'm not sure how to proceed. I'm trying to find solubility (Ksp) of Cu(IO3)2 from titration experiment. The following equations were provided: Cu(IO3)2 --> Cu^2+ + 2IO3^- Ksp =

asked by Constantine on July 23, 2014
8. ## science

The analysis of lead (Pb) in a sample of solder was carried out using atomic absorption spectroscopy as follows. 1.013 g of solder was completely dissolved in a small volume of nitric acid and the solution made up to 1.000 L with distilled water. A 50.0

asked by Tasha on April 4, 2015
9. ## For Dr.Bob222 (chem work)

What is the pH of a solution of 120 ml 0.15M acetic acid to which we add 30mL 0.2M NaOH? CAN YOU CHECK MY WORK PLEASE? 0.15 mol/L * 0.12 L = 0.018 mol acetic acid 0.2 mol/L * 0.03 L = 0.006 mol NaOH 0.018 - 0.006 = 0.012 mol of acetic acid in excess pH =

asked by Gulzaman on August 27, 2007
10. ## Chemistry

Part A: Unknown Acid use 1gram and mix with 120 mL of distilled water Determine the concentration of the acid by titrating with 0.0998 M of NaOH Concentration of NaOH= 0.0998M Volume of NaOH= 3.5 mL # moles of NaOH= Initial Concentration of Weak Acid- Show

asked by Saira on March 24, 2010
11. ## algebra

andy has the cards 1,5,7, belle has the cards 5,4,7 carol has the cards 2,4,6, andy draws the question card. do you see 2 or more players who cards sum to the same value? he answered yes. next belle draws the question card. Of the five odd numbers how many

asked by deborah cobb on January 22, 2013
12. ## Writing

BACKGROUND: Ten years ago, I started working as a clerk for DMD Medical Supplies. Six months ago, Liz Jakowski, the human resources director, promoted me to office manager. I manage two employees: Jack Snyder and Ruth Disselkoen. My office provides

asked by VeryFrustrated on May 7, 2009
13. ## Chemistry

HCN is mixed with water. Which is the best description of what you would expect to ﬁnd in the solution? 1. CN−, OH−, and water molecules 2. HCN molecules, H3O+, CN1−, and water molecules 3. H2CN+, OH−, and water molecules 4. H3O+, CN−, and

asked by Anonymous on September 29, 2011
14. ## chemistry

HCN is mixed with water. Which is the best description of what you would expect to find in the solution? 1. CN+, OH−, and water molecules 2. HCN molecules and water molecules 3. H2CN+, OH−, and water molecules 4. HCN molecules, H3O+, CN1−, and water

asked by cheri on September 19, 2012
15. ## American Lit.(Poetry)

I need to find these in this poem: 1.Apostrophe:The addressing of a discourse to a real or imagined person who is not present; also a speech to an abstraction. 2.Synecdoche:A figure of speech in which a part stands for a whole, or a whole for a part.

asked by Charley on November 3, 2008
16. ## organic chemistry

1)Why benzoic acid is soluble in NaOH? 2)Why HCl is insoluble in titration of benzoic acid and NaOH? Benzoic is soluble in a solution of NaOH because the base forms the sodium salt with the acid to form sodium benzoate. The sodium salt is soluble. The

asked by kim on February 21, 2007
17. ## Chemistry

Explain why the solubility of PbF2 is pH dependent, but the solubility of PbCl2 is not. I know the solubility of PbF2 is pH dependent because the solubility would increase as the solution becomes more acidic because the F^- ion is the conjugate weak base

asked by Robin on April 11, 2016
18. ## english

What are the subjects, predicates, adjective phrases, adverb phrases, infinitive phrases, etc. in these sentences? Manteris, author of Super Bookie, was responsible for making proposition bets a huge business when, in 1985, he offered 20-to-1 odds at

asked by Jukana on July 16, 2008
19. ## Chemistry

Oxalic acid , HOOCCOOH (aq) , is a diprotic acid with Ka1= 0.0560 and Ka2=0.0145. Determine the [-OOCCOO-] in a solution with an initial concentration of 0.139 M oxalic acid. HOOCCOOH(aq) = HOOCCOO-(aq) + H+(aq) HOOCCOO-(aq) = -OOCCOO-(aq) + H+(aq) I have

asked by Amanda on April 11, 2017
20. ## Chemistry

Oxalic acid , HOOCCOOH (aq) , is a diprotic acid with Ka1= 0.0560 and Ka2=0.0145. Determine the [-OOCCOO-] in a solution with an initial concentration of 0.139 M oxalic acid. HOOCCOOH(aq) = HOOCCOO-(aq) + H+(aq) HOOCCOO-(aq) = -OOCCOO-(aq) + H+(aq) I have

asked by Amanda on April 11, 2017

this is a table with some questions and i don't know how to solve it (1)real domestic output (GDP=DI) in billions \$200 \$250 \$300 \$350 \$400 \$450 \$500 \$550 (2)aggregate expenditures private closed economy billions \$240 \$280 \$320 \$360 \$400 \$440 \$480 \$520

asked by britney on November 3, 2006
22. ## chemistry

Data: freezing point of pure cyclohexane: 6.0 degrees celcius Freezing point of unknown soluton: 1.6 degrees celcius weight of cyclohexane: 40.0231g=0.0400231 kg weight of unknown solute: 0.4872 g K_f_ of cyclohexane: -20.00 degrees Celciusx kg/mole

asked by Tina on May 2, 2011
23. ## Chemistry

Chromium is electroplated from an aqueous solution containing H2SO4 and H2CrO4. What current is required to deposit chromium at rate of 1.25g/min. 1.25g x 1mol/51.9961 = .0240mol Now I just don't know how to figure out the number of electrons to do the

asked by Jennifer on April 1, 2007
24. ## Chemistry

Which of the following is NOT TRUE? A. The blank for this experiment must have 100 % transmittance if placed in a spectrometer (Spec 20). B. The volume required to titrate the blank is subtracted from the volume used to titrate the analyte solution to give

25. ## chemistry

1. Divide the ions below into 2 groups, those that tend to form soluble compounds and those that tend to form insoluble compounds. (〖Pb〗^(+2), 〖Na〗^+, 〖Nh4〗^+, 〖Ag〗^+, 〖NO3〗^-, 〖OH〗^-, 〖Cl〗^-, 〖CO3〗^(-2), 〖PO4〗^(-3)) 2.

asked by jhong on March 21, 2012
26. ## Chemistry

How do you find the Ka1 and Ka2 of oxalic acid when it is in a solution that is 1.05 M H2C2O4 and has a pH of 0.67. [C2O4^2-] = 5.3x10^-5 M. I have tried using an ICE table for both reactions, as oxalic acid is a diprotic acid, but I am having trouble

asked by Erika on November 1, 2015
27. ## CHEM HELP RIGHT NOW PLEASE

n the titration of 25.00 ml of a water sample, it took 20.590 ml of 4.995x10-3 M EDTA solution to reach the endpoint. Complete the questions below: Calculate the number of moles of EDTA required to titrate the water sample. (enter your answer with 3

asked by Den on October 17, 2012
28. ## Differential Equations

A tank originally contains 5 lb of salt dissolved in 200 gal of water: Starting at time t=0, a salt solution containing 0.10 lb/gal is to be pumped into the tank at a constant rate and the well-stirred mixture is to flow out of the tank at the same rate.

asked by Joe on September 17, 2012
29. ## Calc: euler's method

Use Euler's method with step size 0.2 to estimate y(1), where y(x) is the solution of the initial-value problem below. Give your answer correct to 4 decimal places. y' = 1 - xy y(0) = 0 y(1) = ____ ? ... help, this is what i've done but got the wrong

asked by COFFEE on June 20, 2007

1. Which of the following examples of dialogue shows the correct punctuation? (1 point) Madison said, "we should all go to the hardware store". Madison said, "We should all go to the hardware store." Madison said "We should all go to the hardware store."

asked by tesj on November 25, 2012
31. ## chem

Which of the following is NOT true about the thermodynamic standard state? A. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25C. B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A pure

asked by Anonymous on February 24, 2008
32. ## ChemistryPRELABS

The mass of potassium iodate (KIO3) contained in an impure sample was determined by titration with sodium thiosulfate (0.1005 M). The impure KIO3 was dissolved in 50 cm 3 of water, an excess of potassium iodide (KI) and 5 cm 3 of dilute sulphuric acid was

asked by Ami on October 6, 2015
33. ## Human Services

Develop a number of hunches about the clients in the following vignettes. What is the basis of your hunch (theory, experience, knowledge about social conditions, etc.)? Leah is a 13-year-old runaway living on the streets with a group of three other teens.

asked by Linda on July 24, 2008
34. ## Plz help me..just one MATH question

The number 1 is both the square of an integer and the cube of an integer. What is the next larger interger which is both a square and a cube of a positve integer. plz help, the only number i can think of was 0 but its smaller than one. what is the erroron

asked by Vanessa on November 7, 2006
35. ## MATH

1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL STEPS) sin 2x - sin x = 0 2.) GIVEN: sin u = 3/5, 0 < u < ï/2 Find the exact values of: sin 2u, cos 2u and tan 2u using the double-angle formulas. 3.)Use the half-angle formulas to

asked by MAKITA on April 10, 2009
36. ## Philosophy

What is the meaning of validity, truth, and soundness as they relate to the area of logical syllogisms? Google soundness in logic Check the second entry, it should answer your question. Roger means this website: http://philosophy.lander.edu/logic/tvs.html

asked by Brenda on September 21, 2006
37. ## algebra 2

Classify the system , and determine the number of solutions. This system is inconsistent. It has infinitely many solutions. This system is consistent. It has infinitely many solutions. This system is inconsistent. It has no solutions. This system is

asked by Kim on July 24, 2008
38. ## chem

The equilibrium constant Kc equals 5.90 for the reaction CH3COOH + C2H5OH CH3COOC2H5 + H2O Find the molar concentrations of acetic acid, ethanol, ethyl acetate, and water at equilibrium when .10 M acetic acid and .20 M ethanol are allowed to equilibrate. I

asked by JP on April 16, 2007
39. ## chemistry

The cell shown above is a concentration cell. Both cells contain a copper solution and have copper electrodes. The only driving force for this cell is the difference in the concentration of the copper solutions. The system will react to equalize the

asked by bekah on May 5, 2014
40. ## decision making

Tom Garvey, your boss, is the director of highway safety for the state. Tom has two main problems. One is that there is never enough money in the budget to implement all the schemes his office proposes. The second is that many of the schemes are

asked by Vanessa on November 4, 2012

Figure 1 shows a simplication of the AM1.5 solar spectrum at 1000W/m2. The spectrum is divided in three spectral ranges: A for 0nm

asked by Anonymous on October 26, 2013
42. ## surds

Can anyone explain simply how Surds work and a simple process how to solve them. Also a simple explanation for factorisation is needed. You have to be much more specific. Surds is a very encompassing term. Since this is not my area of expertise, I searched

asked by glenda on February 22, 2007
43. ## math

a bathroom cleaner contains 1 part of bleach with 4 parts of water. if you need 10 parts of bathroom cleaner, how much water and bleach do you need? If 1 part bleach and 4 parts water = 5 parts, then what do you need to do to get 10 parts? Although this

asked by mae on February 2, 2007
44. ## biology

A common first step in the making of a DNA library is to obtain DNA from many of your chosen organisms and cut this source DNA with a restriction enzyme. It is likely that some genes will contain sites for the chosen restriction enzyme, and in this case,

asked by Anonymous on May 2, 2013

Can someone please check my essay? Deserted Island Essay The format for this essay should be based on the Five-Paragraph Essay format. Use the following suggestions to create an island, details, and tone for your essay. As you read through the suggestions,

asked by CB on August 8, 2012
46. ## chemistry

I can't find a substance apart of water with a pH of 7,so i have a question, i don't know if water is the only neutral substance or if there are more which one's are those? Any salt solution that doesn't hydrolyze in water will be neutral. Any liquid

asked by Claudia on February 4, 2007
47. ## College Algebra

Let x = the number of birds that Tim has. Let y = the number of dogs that Tim has. Tim has more than twice as many dogs as he has birds. Tim has more than 2 birds. The total number of dogs and birds that Tim has is less than 11. Set up an appropriate

asked by Marie on October 4, 2016
48. ## Chemistry

Which one of the following pairs of 0.100 mol L-1 solutions, when mixed, will produce a buffer solution? A. 50. mL of aqueous CH3COOH and 25. mL of aqueous CH3COONa B. 50. mL of aqueous CH3COOH and 25. mL of aqueous HCl C. 50. mL of aqueous NaOH and 25. mL

asked by Macky on May 2, 2010
49. ## Social studies

Which of the following was the Catholic Church's response to the development of Protestantism? A. It launched the Reformation. B. It removed the pope as head of the church. C. Its leaders began the Counter-Reformation.** D. It eliminated the Inquisition.

asked by Sorry To Disturb BuT I need help on September 28, 2018
50. ## Social Studies

1.Which of the following was the Catholic Church's response to the development of Protestantism? A. It launched the Reformation. B. It removed the pope as head of the church. C. Its leaders began the Counter-Reformation.** D. It eliminated the Inquisition.

asked by Helpsomeone on October 4, 2018
51. ## chemistry

A solution of ethanol in water boils at 101.5 degrees C. what it tne molarity? Can you show me the setup i would use?? I did the first time you posted this problem. delta T = i*Kb*m delta T = 101.5 - 100 = 1.5 i = 1 kb = 0.51 m = ?? m equals molarity i

asked by jessica on May 31, 2007
52. ## Science-PsyDAG

We did a experiment to recognize chemical change and here it is: I'm listing what we did, step by step. 1. Put on your safety goggles. In one row of your spot plate, add five drops of the sodium hydroxide solution to each of four deprssions. Then add two

asked by Sara on March 24, 2010
53. ## chemistry

Posted by lyne on Tuesday, March 25, 2008 at 11:44pm. What is the pH ( 3 significant digits) of a 0.01 M solution of sulfuric acid? Hint is that the first ionization constant is "large", and the second is finite, and the [H+] donated by the second

asked by lyne on March 26, 2008
54. ## Science

A magnet was placed near a pile that contained both iron and sulfur. The magnet was moved gradually closer to the pile. As it neared the pile, the magnet started attracting small pieces of iron from the pile. What best describes? A. Solution or iron and

asked by Brianna on October 20, 2013
55. ## child development (answer included)

Match the psychological theories with the appropriate statement(s): F,J__Psychodynamic Theory K,B,D__Trait Theory I,N__Learning Theory _A,C,G_Sociocultural E,H__Humanistic Theory A. Individualism versus collectivism B. Popular theorist Eysenck initiated

asked by scooby on November 28, 2009

Match the psychological theories with the appropriate statement(s): F,J__Psychodynamic Theory K,B,D__Trait Theory I,N__Learning Theory _A,C,G_Sociocultural E,H__Humanistic Theory A. Individualism versus collectivism B. Popular theorist Eysenck initiated

asked by scooby on November 29, 2009
57. ## chemistry

The following data were obtained at 25° C for the reaction [1+2+2] C2H5Br + OH- C2H5OH + Br- Determine the rate law for the reaction from these data. [C2H5Br] [OH-] Rate 0.150 0.200 4.8 x 10-5 0.300 0.200 9.6 x 10-5 0.450 0.200 14.4 x 10-5 0.300 0.600

asked by ranu on February 8, 2012
58. ## Chemistry

7.0 ml of 6.0 M NaOH are diluted with water to a volume of 400 ml. You are asked to find the molarity of the resulting solution. The total number of moles of NaOH is not changed on dilution. Calulate the molarity. Work: (6)(.007)=(x)(.4) x=.105M Thanks for

asked by Anonymous on April 19, 2007
59. ## Chemistry

Calculate the mass of Fe(OH)3 s) produced by mixing 50.0 mL of 0.153 M KOH (aq) and 25.0 mL of 0.255 M Fe(NO3)3 (aq), and the number of moles of the excess reactant remaining in solution. I got 0.00383 mol Fe(NO3)3 remaining. I don't know how to obtain the

asked by Tiffany on October 29, 2015
60. ## Chemistry

The vapor pressure of chloroform is 173.11 mm Hg at 25 degrees celsius. A nonvolatile, nonelectrolyte that dissolves in chloroform is aspirin. Calculate the vapor pressure of the solution at 25 degrees celsius when 6.243g of aspirin (180.1g/mol) are

asked by Hannah on February 19, 2012

The vapor pressure of chloroform is 173.11 mm Hg at 25 degrees celsius. A nonvolatile, nonelectrolyte that dissolves in chloroform is aspirin. Calculate the vapor pressure of the solution at 25 degrees celsius when 6.243g of aspirin (180.1g/mol) are

asked by Hannah on February 19, 2012
62. ## chemistry

hi, I am trying to find the solubility of Sodium Acetate by using 0.100 mol Hydroxide(base) and 0.837 mol acetic acid( vinegar). The theoretical solubility of sodium acetate is 82.3g/100ml at 25C. Doing calculations we would want NAOH concentration of

asked by john on June 3, 2008
63. ## chemistry

Hi. I have a little problem with my chemistry task. I have 4 unknown solutions: 1 light blue (A),1 green (B), 2 without colour (C & D). As I understood that the blue one is CuSO4, green one is NiCl2, but 1 uncoloured is NH3, then... A - CuSO4 [couldn't ir

asked by Ksenija on December 27, 2008
64. ## Chemistry

Question One Lead chloride dissolves in water according to PbCl2(s) Pb^2+ + 2Cl^- (aq) The solubility in pure water has been measured to be 4.44g . L^-1 . Calculate the solubility product of lead chloride in pure water. Your answer should be in units of

asked by Odesa on December 11, 2012
65. ## probability self study

each of three identical jewelry boxes has two drawers. in each drawer of the first box there is a gold watch. in each drawer of the second box there is a silver watch. in one drawer of the third box there is a gold watch while in the other there is a

asked by Woody on May 19, 2015
66. ## Chemistry

2KMnO4(aq)+16HCl(aq)->2MnCl2(aq)+5Cl2(g)+8H2O(l)+2KCl(aq) A.)the volume of 0.414 M KMnO4 needed to produce 1.66 mol MnCl2 B.) the volume of 2.15 M HCl needed to produce 112 mL of 0.618 M KCl C.)the molarity (M) of the HCl solution when 26.42 mL react with

asked by Anonymous on December 10, 2010
67. ## English

Hi can you please help correct this paragraph or give me direction. Thank you, the assignment is: Your cousin has moved to your town and is looking for a job. Her previous experiences are working as a cashier and sales clerk at two department stores. You

asked by Lin on September 9, 2011
68. ## Chemistry

A water chemist obtained a 250 ml sample from a nearby lake and fixed the oxygen on-site with alkaline solutions of MnSO4 and KI-NAN3. Returning to the laboratory, a 200 ml sample was analyzed by acidifying the sample with conc H2SO4 and then titrating

asked by Dalal on March 20, 2018
69. ## Biology

A cell has a salt concentration of 0.2 %. If it is placed into a solution with a salt concentration of 0.1 %. a) What change will occur to the salt concentration inside the cell? b)What change will occur to the water concentration inside the cell? c)What

asked by Emily on October 18, 2010
70. ## 7th grade Math quick help Ms. Sue

Can you check to see if tese are right? 1. What is 0.68 written as a simplified fraction? 68/100 17/25 100/68 34/25 2. Mrs. Whimsey’s class is having a pizza party. If there are 16 students and 4 pizzas cut into 8 slices, what answer choice represents

asked by Delilah on October 3, 2012
71. ## Math

What is the value of a stock that grows at a supernormal rate of 18% for the first four years, and then slows down to a constant growth rate of 10%? An annual dividend of \$2.00/share was just paid, and the rate of return on common stock is 13%. Possible

asked by Lyra on June 23, 2017

I would like someone to revise this for me. Thanks! *** **** 10/5/14 Ever since I can remember I have lived in Philadelphia. I have many nice memories from Philadelphia, and I am fortunate enough to have a relatively normal life without having to

asked by Joe :) on October 8, 2014
73. ## Algebra

Please help me solve this problem the kinetic energy (k) energy of a moving object with varies jointy with it mass (m) and the squareo of its velocity (v). If an object has an mass of 22.5 kilograms and moving with a velocity of 20 meters per secomd has a

asked by rosa on May 23, 2010
74. ## Math

Asked to simplify the expression sin(180Ã¢Ë†â€™ÃƒÂ¨), Rory volunteered the following solution: sin(180Ã¢Ë†â€™ÃƒÂ¨) = sin 180Ã¢Ë†â€™sin ÃƒÂ¨, and, because sin 180 is zero, it follows that

asked by Anonymous on January 3, 2017
75. ## Chemistry

EQUILIBRIUM: To prepare the standard solution, a very large concentration of ferric ion is added to a small initial concentration of thiocyanate ion. True or False It would help if we knew what you were doing. We are determining Chemical Equilibrium:

asked by Joe on January 31, 2007
76. ## Visual Basic (Computer Programming)

ALGORITHM EXERCISES 1. Wilma Peterson is paid by the hour. She would like a program that both calculates and displays her weekly gross pay. For this exercise, you do not need to worry about overtime pay, as Wilma never works more than 40 hours in a week.

asked by Erick on January 16, 2013
77. ## Chemistry

A 0.4584 g sample of impure zinc chloride, ZnCl2, FW = 136.3 g/mole, was dissolved in water and excess silver nitrate was added to the solution. The mass of the dry silver chloride, AgCl, FW = 143.3 g/mole, produced was 0.8564 g. The balanced precipitation

asked by Anonymous on October 16, 2011
78. ## Chemistry - Solubility

INFORMATION: [HCl] = 0.1388 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: A 25 ml aliquot was used Flask A: Distilled Water (7.4 mL of HCl needed to titrate) Flask B: 0.05 M NaOH (7.5 mL of HCl needed to titrate) Flask C: 0.025 M NaOH

79. ## chemistry

A classic experiment in equilibrium studies dating from 1862 involved the reaction in solution of ethanol and acetic acid to produce ethyl acetate and water. The reaction can be followed by analyzing the equilibrium mixture for its acetic acid content. In

asked by gs on March 13, 2011
80. ## organic chemistry laboratory

hi, im not sure if all my answers are correct especially number 5. could any one check and tell me? please and thank you. 1. Why is it important to have clean test tubes before running a test? Before which tests should acetone not be used to clean the test

asked by Niah on November 2, 2014
81. ## organic chemistry laboratory

hi, im not sure if all my answers are correct especially number 5. could any one check and tell me? please and thank you. 1. Why is it important to have clean test tubes before running a test? Before which tests should acetone not be used to clean the test

asked by Niah on November 4, 2014
82. ## Chemistry - Solubility

INFORMATION: [HCl] = 0.1388 M We placed 0.5 g Ca(OH)2 in 100 mL of the following solutions: Flask A: Distilled Water (7.4 mL of HCl needed to titrate) Flask B: 0.05 M NaOH (7.5 mL of HCl needed to titrate) Flask C: 0.025 M NaOH (10.8 mL of HCl needed to

83. ## algebra

The Answer is (32/20)^2=2.56times the kinetic enrgy at 20 m/s 2.56x4500 Problem The kinetic energy (k) of moving object varies jointly with it mass (m) and the square of its velocity(v). If an object has a mass of 22.5 kilgorams and moving with a velocity

asked by rosa on May 23, 2010
84. ## chemistry

A 20.0 gram sample is a mixture of sodium phosphate ,sodium mono-hydrogen phosphate,sodium dihydrogen phosphate and sodium chloride. The sample is dissolved in 100.0 ml of deionized water and titrated with 1.5 M hydrochloric acid. The initial pH of the

asked by bill on May 22, 2012
85. ## chemistry

A 20.0 gram sample is a mixture of sodium phosphate ,sodium mono-hydrogen phosphate,sodium dihydrogen phosphate and sodium chloride. The sample is dissolved in 100.0 ml of deionized water and titrated with 1.5 M hydrochloric acid. The initial pH of the

asked by bill on May 22, 2012
86. ## Calculus

This is another textbook number that doesn't have the solution and I can't figure it out. Any tips would be greatly appreciated. For each of the plane surfaces, calculate the exact surface area. (Answer in fractions) (a)The surface composed of all surfaces

asked by Paul on August 9, 2012
87. ## Psy

Match the psychological theories with the appropriate statement(s): Psychodynamic Theory Trait Theory Learning Theory Sociocultural Humanistic Theory A. Individualism versus collectivism B. Popular theorist Eysenck initiated the five-factor model. C. The

asked by Lost and Need Help on November 23, 2008

BACKGROUND: Ten years ago, I started working as a clerk for DMD Medical Supplies. Six months ago, Liz, the human resources director, promoted me to office manager. I manage two employees: Jack and Ruth. My office provides secretarial support for the four

asked by Kayla on March 29, 2012
89. ## AP Chemistry

So I already posted this question earlier today and got a reply but now that Im working through it, its not working. What mass of solid sodium formate (of MW 68.01) must be added to 130 mL of 0.63 mol/L formic acid (HCOOH) to make a buffer solution having

asked by Helpmepls on January 16, 2018
90. ## Chemistry

For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass

asked by Hannah on October 23, 2011

For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass

asked by Hannah on October 23, 2011
92. ## chemistry

the solubility of AgCl in HCl is a. low, as Cl- ions cause an equilibrium shift towards the solid form b. low, as Ag+ has already reacted with Cl- c. high, as HCl readily ionizes d. high, as AgCl can then form e. high, as H2 forms, then escapes (a) The

asked by Mary on April 21, 2007
93. ## English

For homework I have to answer the following questions regarding Puerto Rican obituary by Pedro pietri but I am horrible at interpreting poems if someone can please help thank you "Puerto Rican Obituary", by Pedro Pietri: What has the American dream turned

asked by Jessica on May 23, 2013
94. ## Chemistry

At a certain temperature, the solubility of N_2 gas in water at 2.38 atm is 56.0 mg of N_2 gas/100 g of water. Calculate the solubility of N_2 gas in water, at the same temperature, if the partial pressure of N_2 gas over the solution is increased from

asked by Becca on February 4, 2012
95. ## chem 2

which one of the following pairs of 0.100 mol L-1 solutions, when mixed will produce a buffer solution? a 50. mL of aquesous CH3COOH and 25.mL of aquesous HCI b 50. mL of quesous CH3COOH and 100. mL of aqueous NaOH c 50. mL of aquesous NaOH and 25. mL of

asked by leaha on March 3, 2012
96. ## Chemistry

40.0 g of magnesium chloride (MgCl2) in 250.0 g of water at 22 °C.Calculate a) the vapor pressure of this solution, b) the freezing point, c) the boiling point. I know it is something like this, but I continue to get the incorrect answer. A) 40.og

asked by Jasmine on May 23, 2013
97. ## chemistry

A student generates H2(g) over water using the reaction between zinc and hydrochloric acid Zn(s)+ 2HCl(aq)---> ZnCl2(aq)+ H2(g) Data: Mass of vial and zinc 15.5082 mass of vial 15.3972 mass of zinc 0.111 final burette reading 45.30mL barometric pressure:

asked by Yuli on November 23, 2011

I don't under stand ho to get the answer to this excel question can anyone help? and email me back skylerbloo at netscape . net The assignment is in three parts: 1. An analytic section that you will submit as an Excel spread sheet 2. A PowerPoint

asked by Trisha on August 19, 2009