# 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 215
1. ## chemistry

A 10% acid solution is to be mixed with a 50% acid solution in order to get 120 ounces of 20% acid solution. How many ounces of the 10% solution and 50% solution should be mixed?

asked by Meliss on April 26, 2010
2. ## math

1)solve the equation p=log(squareroot8)/log(2) 2)hence solve the equation log(31+log(16)/log(x))/log(9)=log(squareroot8/log(2)

asked by meredith on April 2, 2016
3. ## chemistry

the titration of 25.0 mL of a 0.040 M aqueous solution of maleic acid C2H2(COOH)2, with aqueous 0.10 M NaOH solution. For maleic acid, Ka1 = 0.013 and Ka2 = 8.5 x 10-7 How many milliliters of the 0.10 M NaOH solution are needed to completely react all the

asked by sue on June 30, 2013
4. ## chemistry

When 40.0 mL of 1.00 M H2SO4 is added to 80.0 mL of 1.00 M NaOH at 20.00°C in a coffee cup calorimeter, the temperature of the aqueous solution increases to 29.20°C. If the mass of the solution is 120.0 g and the specific heat of the calorimeter and

asked by kamal on June 23, 2014
5. ## Chemistry

Suppose 26.0g of sodium bromide is dissolved in 150mL of a 0.60M aqueous solution of silver nitrate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the sodium bromide is

asked by Angie on July 26, 2014
6. ## chemistry

A 10.0-mL sample of vinegar, which is an aqueous solution of acetic acid, CH3COOH, requires 16.5 XML of a 0.500M NaOH solution to reach the endpoint in a titration (where the moles of acid are equal to the moles of base). What is the molarity of the acetic

asked by Zarion Gibbs on May 4, 2011
7. ## CROSS-CULTURAL COMMUNICATION

When someone complains about a problem,is it a good idea to quickly suggest a solution? A. Yes, because a quick suggestion shows you think quickly. B. Yes, because offering a solution shows that you care about the other person. C. No, because the other

asked by Deborah Roberts on September 10, 2012
8. ## Chemistry

1.Chlorine gas can be produced commercially by passing an electric current through a concentrated solution of sodium chloride (brine). The unbalanced equation is NaCl(aq) + H2O(ℓ) → NaOH(aq) + Cl2(g) + H2(g). If the brine contains 163 g of NaCl, how

asked by Sarah on February 24, 2015

When someone complains about a problem, is it a good idea to quickly suggest a solution? A. Yes, because a quick suggestion shows you think quickly. B. Yes, because offering a solution shows that you care about the other person. C. No, because the other

asked by Sheilah on March 2, 2012
10. ## Chemistry

A 10.0 ml sample of vinegar which is an aqueous solution of acetic acid, requires 16.5ml of a 0.500M NaOH solution to reach the endpoint in a titration (where the moles of acid are equal to the moles of base). What is the molarity of the acetic acid

asked by Brittany on April 19, 2011
11. ## chemistry

1) Aqueous solutions of potassium sulfate and ammonium nitrate are mixed together. Which statement is correct? A) Both KNO3 and NH4SO4 precipitate from solution B) A gas is released C) NH4SO4 will precipitate from solution D) KNO3 will precipitate from

asked by mathew on October 15, 2014
12. ## Chemistry Test Tomorrow

I don't actually have problems, but I have a test over stoichiometry tomorrow, which is pretty much going to determine my semester grade. I was just wondering if anyone knew any helpful tips, hints, or just an easier way to explain the basics of

asked by Trish on December 14, 2006
13. ## Chemistry

Determine the mass of PbSO4 produced when 10mL of 0.2M CuSO4 reacts with 10mL of 0.2M Pb(NO3)2? Balance the equation CuSO4 + Pb(NO3)2 → PbSO4 + Cu(NO3)2 Find the number of moles for CuSO4 c=n/v n=c × v n=0.2 × 0.01 n=0.002 mol Since it is a 1:1 ratio,

asked by Kendall on August 5, 2015

Mr. Whipple wants to blend two teas, regular and all-spice, whose wholesale cost is \$0.90/lb and \$1.20/lb respectively. He wil sell the mixture at \$1.65/lb and wishes to make a 50% profit over wholesale cost. What should the ratio of regular to all-spice

asked by Rebecca on August 23, 2006
15. ## Chemistry

Specifications for lactated Ringer's solution, which is used for intravenous (IV) injections, are as follows for each 100mL of solution: 285-315 mg NA+ 14.1 - 17.3 mg K+ 4.9 - 6.0 mg Ca2+ 368 - 408 mg Cl 231 - 261 mg lactate, C3H5O3 How would you make this

asked by Kevin on August 30, 2011
16. ## Chemistry

Suppose 3.50g of zinc bromide is dissolved in 300.mL of a 65.0mM aqueous solution of potassium carbonate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the zinc bromide is

asked by Katie on December 17, 2018
17. ## Chemistry

You are a lab technician and must create 250 ml of a 17% salt solution. You have available three stock solutions. You have a one liter container of a 5% salt, a 500 ml container of a 28% salt solution, and a 400 ml container of a 40% salt solution. Discuss

asked by Fatih on March 5, 2012
18. ## Chemistry

A technician mixes a solution containing silver nitrate with a solution containing sodium chromate. 2.89 g of precipitate is produced (assume silver chromate). Calculate the mass of silver nitrate present in the first solution. Make sure you have the

asked by Jill on July 27, 2015
19. ## chemistry

Suppose 0.432g of zinc acetate is dissolved in 200.mL of a 16.0mM aqueous solution of ammonium sulfate. Calculate the final molarity of acetate anion in the solution. You can assume the volume of the solution doesn't change when the zinc acetate is

asked by Deborah on January 18, 2012
20. ## Chemistry

Consider the following reaction AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq) DH = -66 kJ Suppose that 100.0 mL of 0.100M AgNO3 is added to 200.0 mL of 0.100 M NaCl in a coffee cup calorimeter. Assuming that the initial temperature of the solution is

asked by Mahnoor on November 15, 2014
21. ## Precalculus check answers help!

16. Find the distance between P (–2, 5) and the line with equation x – 3y + 4 = 0. (1 point) 17(sqrt10)/ 10 0 -17(sqrt10)/ 10 13(sqrt10)/ 10 ~ 17. Find the distance between the lines with equations 5x + 12y = 12 and y = –x + 3. (1 point) 24/13 ~

asked by Kelsey on May 31, 2012
22. ## Precalculus check answers help!

16. Find the distance between P (–2, 5) and the line with equation x – 3y + 4 = 0. (1 point) 17(sqrt10)/ 10 0 -17(sqrt10)/ 10 13(sqrt10)/ 10 ~ 17. Find the distance between the lines with equations 5x + 12y = 12 and y = –x + 3. (1 point) 24/13 ~

asked by Kelsey on May 30, 2012
23. ## Pre-Algebra Calculus

NEED HELP PLEASE Mixture Problems 1.Joe created a metal containing 40% platinum by combining two other metals. One of these other metals weighed 12 lb. and contained 45% platinum. If the other weighed 3 lb. then what percent of it was platinum? 2. 12 gal.

asked by michele on January 23, 2016
24. ## Chemistry

Sorry about that The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been

25. ## Chemistry

An aqueous antifreeze solution is 40.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.05 g/cm3. Calculate the molality, molarity, and mole fraction of the ethylene glycol. molality I actually can do this whole problem EXCEPT for one

asked by Kyle on November 30, 2015
26. ## math

At the end of Summer, Puss discovers that his radiator antifreeze solution has dropped below the safe level. If the radiator contains 4 gallons of a 25% antifreeze solution, how many gallons of pure antifreeze must he add to bring it up to a desired 50%

asked by Anonymous on March 27, 2016
27. ## chemistry

How do you find the mass of a solution if you have 1L of 2.5 M MgCl2. I have determined how many moles are present in MgCl2 which was 2.5 and how grams are present which came out to be 238.025g Now I'm asked "What is the mass of the solution and the mass

asked by Jenna on March 3, 2011
28. ## Math

1. Which number is the resolution of m + 90 = 150? a. 50 b. 60 (my answer) c. 140 d. 240 2. Which number is the solution of n/3 = -12? a. -36 b. -4 (my answer) c. 4 d 36 3. Use mental math to find the solution of 19b = 190. a. 10 b. 11 c. 171 (my answer)

asked by Rylee on November 5, 2016
29. ## chemistry

No precipitate formed when an aqueous solution of NaCl or Na2SO4 was added to the sample solution. A precipitate formed when the sample solution was made basic with NaOH. Which ion(s) are present in the sample soluiton? [Hg2]2+ [Ba]2+ [Mn]2+ I know that

asked by Christie on October 8, 2007
30. ## Physics .. help!!

Imagine a landing craft approaching the surface of Callisto, one of Jupiter's moons. If the engine provides an upward force (thrust) of 3270 N, the craft descends at constant speed; if the engine provides only 2190 N, the craft accelerates downward at 40

asked by COFFEE on February 6, 2007
31. ## Intro to Programming

I have no clue what i am doing - any and all help would be appreciated - thanks! Finding an Input Giving a Desired Output PROBLEM BACKGROUND In many control problems, the output response of a system to an input is a non-linear function, that function

asked by Oscar on September 26, 2008
32. ## Chemistry

(a) The solubility of bismuth iodide (BiI3) in water is 4.891 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi^3+ (aq) and I^- (aq). (b) Do you expect the solubility of (BiI3) in 0.1 M NaCL (aq) to be equal to,

asked by Chemgam on January 11, 2013
33. ## Math

Without graphing, describe the end behavior of the graph of f(x)= -5x^2-3x+1 as x starts from a negative value and increases the equation -5x^2-3x+1 curves up and peaks and comes down and passes the y-intercept at (0,1) to negative infinity. I don't know

asked by Jon on April 21, 2009
34. ## chemistry

3. Answer the following questions: For each question show a balanced chemical equation and show all calculation for full credit. a. Assume that you had 100 nuts (N) and 75 bolts (B). How many NB molecules could you make by screwing one nut onto each bolt?

asked by Josh on February 23, 2012
35. ## Chemistry

How many grams of S8 are needed to produce 225 grams of sulfur hexafluoride? I know to begin with a balanced equation S8+24F2(arrow)8SF6. I've spent a couple of hours trying to figure out the next step, but I'm stuck. Thanks for any pointers!

asked by Darius on July 15, 2016
36. ## chemistry

Chlorine dioxide, ClO2, has been used as a disinfectant in air conditioning systems. It reacts with water according to the following equation. ... HCl If 142.0 g of ClO2 is mixed with 33.0 g of H2O, how many grams of which reactant remain if the reaction

asked by Cynthia on June 29, 2010
37. ## calculus

A management consultant estimates that the number of hours,h, per day that employees work and their daily pay of p dollars are related by the equation 60h5 = 2,000,000 = p3. Find dh/dp at p = 200 and interpret your answer.

asked by Tina Mae on December 1, 2011
38. ## Algebra

find the x and y intercepts: 3x - 2y = -12 i know for the x intercept, put y=0 in the equation,s olve for x. For the y intercept, do the reverse. But i still don't understand how to solve it. Its just majorly fustrating me. And i can't go to school and ask

asked by sami on October 21, 2010
39. ## college chem

Determine the molar solubility of AgBr (Ksp = 5.40e-13) in 2.502 M NH3 if the complex ion [Ag(NH3)2]+ forms with a Kf = 1.70e7 will I need to make an chemical equation using the compounds they give me? and then do an ICE table?

asked by hershi on April 5, 2014
40. ## math (urgent!)

I was given a graph and told to find an equation for the temperature T in terms of the time t in the form T(t) = a sin(kt-c)+d where a, k, c and d are constants. The max was 32.9 and the min 21.1 I determined that amplitude = 5.9 vertical = 27 period =

asked by Anonymous on January 13, 2013
41. ## Algebra

Today Star Satellite is offering the following special package to new customers: a one-time set-up fee of \$10, the first month for free, and \$32 per month thereafter. Which equation best represents k, the total cost of service for m months? A k = (10 +

asked by ilovepink on October 15, 2009
42. ## algebra

f the distance the car traveled after applying the brakes equals 20 feet, what does that mean to the officer investigating the accident? (HINT: Let d = 20, bring 20 to the right so that the equation equals zero, identify the coefficients, A, B and C and

asked by alyssa on March 5, 2012
43. ## Chemistry

Question: write the balanced equations for the titration of oxalic acid (C2H2O4) with KOH. Work so far: I know that the overall equation is COOH)2 + 2KOH ------.> (COOK)2 + 2H2O but I am unsure how to proceed to the two step-wise equations

asked by Alexa on April 9, 2016
44. ## Calculus

Write a slope field for the differential equation. Corporate administrators notice that 13% of their employees retire each year, while 2,500 are newly hired. What is the long term effect if they initially have 30,000 employees?

asked by Sienna on April 1, 2012
45. ## chemistry

Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. __MnO4– + __H+ + __Fe2+ ---> __Mn2+ + __H2O + ___Fe3 is .. 1MnO4– + 8H+ + 1Fe2+ ---> 1Mn2+ + 4H2O + 1Fe3

asked by James on April 24, 2008
46. ## Physics

Killer whales at Sea Worl routinely jump 8 m above the water. What is their speed as they leave the water to achieve this? I know that h=8m v=? Would I use h=h_0 + v_0t = 1/2 at^2 but the problem would be that I also don't know the time. I am confused

asked by Tammy on September 19, 2007
47. ## math

angela ate at the same restaurant four times. each time she ordered a salad and left a \$5 tip. she spent a total of \$54. write and an equation to find the cost of each salad is not yet solved by the Tiger Algebra Solver.

asked by abigail on September 5, 2018
48. ## MATH

The FritzHugh-Nagomo equation occurs in many apps such as biology, genetics and heat transfer. In the 1-D case, it can be written as du/dt = d^2/dx^2 + u(u-1)(λ-u) where λ is constant. Show that this eqn supports a travelling wave u(x,t) =(Ae^n1 +

asked by Mr Maverick on May 19, 2016
49. ## chemistry-lab

2.What does it mean to “follow the course of a reaction”? I would imagine it means to find the overall order of the reaction and make it in to a rate law equation. That's part of it. It can mean, in addition, to knowing any intermediates formed and how

asked by Rob on February 13, 2007
50. ## algebra

f the distance the car traveled after applying the brakes equals 20 feet, what does that mean to the officer investigating the accident? (HINT: Let d = 20, bring 20 to the right so that the equation equals zero, identify the coefficients, A, B and C and

asked by alyssa on March 5, 2012
51. ## chemistry

Solid borax dissolves in water according to the equation: Na2B4O7 10H2O(s) 2Na+ (aq) + B4O5(OH)42–(aq) + 8H2O(l) The sign of Ssys will be A. positive B. negative because there are A. more B. less moles of products generated. i've tried solving this

asked by david on April 7, 2008
52. ## Trigonometry

Determine the angle to the nearest degree at which a desk can be tilted before a paperback book on the desk begins to slide. Use the equation mg sin A = umg cos A and assume u = 1.11. (Enter only the number.) I got 115 degrees.

asked by Quinn on December 20, 2018
53. ## algebra

f the distance the car traveled after applying the brakes equals 20 feet, what does that mean to the officer investigating the accident? (HINT: Let d = 20, bring 20 to the right so that the equation equals zero, identify the coefficients, A, B and C and

asked by alyssa on March 5, 2012
54. ## Math

Solve for x: 5/x+6+2/x^2+7x+6=3/x+1 5/x+5+2/(x+6)(x+1)=3/x+1 5(x+6)(x+1)/x+6+2(x+6)(x+1)/(x+6)(x1)=3(x+6)(x+1)/x+1 5(x+1)+2=3(x+6) 5x+5+2=3x+18 5x+7=3x+18 2x=11 x=11/2 or 5 1/2 is my method correct? and I need assitance checking my answer. Thanks for your

asked by Dragonfly on July 24, 2007
55. ## Math

factor each expression completely. if possible. Just checkin the * Ones 1. x^2+19X+90 * 2. x^2-16X+55 * 3. x^2-^6x-91 * 4. x^2+28x+195 * 5. x^2-29x+204 6. x^2+3x+154 7. 2x^2-5x-42 8. 3x^2-13x+12 9. 5x^2+43x-18 10. 6x^2+29x+35 Solve each equation 31.

asked by Monte' on October 29, 2007
56. ## *physics*

Electrons accelerated by a potential difference of 12.87 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. I don't know what equation to use. Any help would be

asked by Beth Macbeth on March 24, 2008
57. ## chemistry

Can you help me write and balance this equation. I also have to include the physical states. Question: When manganese(Mn)is put into dissolved hydrochloric acid(HCl)it produces solid manganese(III)chloride (MnCl3) plus hydrogen. Thanks :)

asked by Miley on January 24, 2008
58. ## Chemistry II

what is the complete & balanced equation for the following reactions & include the catalysts if any: 1. Combustion of Methane: 2. Halogenation of Cyclopentene with Br2 4. Hydrogenation of 3-methyl-1-butyne 5. Combustion of 2-methylpropene 6.

asked by Jessie on February 4, 2014
59. ## Chemisry

Potassium, a silvery metal, reacts with bromine, a corrosive, reddish liquid, to yield potassium bromide, a white solid. Write the balanced equation, and identify the oxidizing and reducing agents.

asked by nana on March 24, 2013
60. ## Math

The highest dive in the Olympic Games is from a 10-meter platform. The height "h" is in meters of a diver "t" seconds after leaving the platform can be estimated by the equation, h=10+4.9t-4.9t^2 I don't know how to make a successful table for this. I

asked by Conder on January 26, 2011
61. ## Science

Given the following equation: N2 + Cl2 > @ NCL3 H=+230 kJ a) What mass of N2 would absorb 96.5 kJ of heat as it reacts? b) What volume of Cl2 at STP would be required to react with the N2 in part (a)? I do not know how to solve this problem. My mindset is

asked by Anonymous on July 9, 2015
62. ## chemistry

Zn(s)+2H+(aq)->Zn2+(aq)+H2(g) Br2(aq)+2I-(aq)->2Br-(aq)+I2(aq) Name one compound containing H+ ions and another containing I- ions, which would be suitable for these reactions. Ezplain why zinc is said to be oxidised in its reaction. Complete the half

asked by Anonymous on January 17, 2008
63. ## Math

The fastest insect in the world is the dragonfly with an average cruising speed of 4.5 metres per second. Write an equation with two variables describing the relationship between the time taken and the distance travelled. If a dragonfly flies for 3 hours

asked by !? on January 18, 2018
64. ## ap chemistry

Use the Clausius-Clapeyron equation to cal- culate the temperature at which pure water would boil at a pressure of 434 torr. The heat of vaporization of water is 41276 J/mol at 100C. Answer in units of C

asked by cheri on April 15, 2013
65. ## Calculus

Can you check my answer? Solve the separable differential equation: dy/dx=(sqrt(x))/2y y=(2/3)x^(3/4) Let f be the function given by f(x)=x^3-5x^2+3x+k is a constant. a) On what intervals is f is increasing? (-oo,1/3), (3,oo) b) On what intervals is the

asked by Anonymous on November 18, 2007
66. ## math

you research the cost of a gallon of gasoline over several years to look for trends the table shows the data you have collected what is the equation of the line of best fit how much would you expect to pay for gasoline in 2029 a)y=0.538x+1.36; \$33.10 b)

asked by hay'ikam on September 11, 2014
67. ## Chemistry

Zn(s)+2H+(aq)->Zn2+(aq)+H2(g) Br2(aq)+2I-(aq)->2Br-(aq)+I2(aq) Name one compound containing H+ ions and another containing I- ions, which would be suitable for these reactions. Ezplain why zinc is said to be oxidised in its reaction. Complete the half

asked by Anonymous on January 17, 2008
68. ## Chemistry College

One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g); ΔH°= –87.9 kJ How much heat is liberated at constant pressure if 0.416 g of iron reacts with 42.0 mL of 0.457 M

asked by Julia on December 2, 2010
69. ## Physics

You're driving down the highway at 20m/s when you see a snowman you don't want to crush 35 m in front of you. Your reaction time before stepping on the brakes is 0.5s, and acceleration created by your brakes is 10 m/s^2 what was the distance travelled

asked by Maria on February 7, 2014
70. ## high school algrebra 1

A youth group is planning a trip to a local amusement park. They are taking a van which holds 10 people. It will cost \$25 for parking and tickets to enter the park are \$18 per person. create an equation for this situation

asked by Alex on June 10, 2014
71. ## math

List advantages and disadvantages comparing and contrasting solving systems of linear equations with two variables by graphing and by equation method. Explain which method you prefer and why. Support your answer by providing appropriate examples

asked by Anonymous on December 17, 2010
72. ## Chemistry

A student in lab gathered temperature and concentration data for the solubility of borax and generated a plot of ln(Ksp) vs. 1/T having the equation of the line y = -11655x + 35.585. Determine the temperature (in units of K) at which the reaction becomes

asked by lisa on April 11, 2013
73. ## Chemistry

Hess's law _____. A.) makes it possible to calculate H for complicated chemical reactions B.) states that when you reverse a chemical equation, the sign of H does not change C.) determines the way a calorimeter works D.) describes the vaporization of

asked by Jack on March 4, 2013
74. ## Calculus

Write a differential equation to model the situation given. Do not solve. Tests of an artifact discovered at the Debert site in Nova Scotia show that 28% of the original 14C is still present. What is the probable age of the artifact?

asked by L.S. on December 14, 2011
75. ## physic

A progressive wave is represented by the equation where y is in mm, t in seconds and x is a distance from fixed point origin, O in meters. Find (a) Frequency, wavelength and speed of the waves (b) phase difference between point 0.25m and 1.10m from O

asked by ash05 on February 27, 2013
76. ## CHEMISTRY

Use the Nernst equation and calculate Ecell for each of the following cells. Enter your answer with 3 significant digits. Enter scientific notation as 1.23E4. (a) Mn(s) | Mn2+(0.11) M || Cr3+(0.24 M), Cr2+(0.11 M) | Pt(s) ____________ (b) Mg(s) |

77. ## chemistry

Suppose the ÄGof, ÄHof, and ÄSo are available and valid at 298 K. Which equation(s) could be used to calculate the change in Gibbs Energy if all product and reactant concentrations (pressures) are 1 M (1 atm) and the temperature is 298 K? Choose all

asked by leighann on April 26, 2016
78. ## Physics

During an episode of turbulence in an airplane you feel 190 N heavier than usual. If your mass is 78 kg, what are the magnitude and direction of the airplane's acceleration? For the F=ma, I manipulated the equation and have gotten, a=190N/78kg=2.4 is this

asked by Kristi on October 13, 2017
79. ## Algebra

The table shows how much an air-conditioning repair company charges for different numbers of hours of work.graph the data and find the and y-intercept from the. then write the equation for the grap intercept formh in slope

asked by ernest on May 4, 2016
80. ## Accounting

Purchased inventory on credit from Horn Trading, R34 275. Deposited cash sales for the first week, R9 000. Inventory is marked up at 50% on cost. How can I enter this two separate transactions into the accounting equation?

asked by Andrea on March 14, 2019
81. ## trig

Two sides of triangle CDE are 9 and 4, as shown. Write an equation in standard form for the line CD. Leave values as radicals. There is a picture of a triangle that passes through point (4,0) The answer is 65^1/2x + 4y = 4(65^1/2) But, I don't understand

asked by Dale on January 28, 2010
82. ## CHEMISTRY

Use the Nernst equation to calculate Ecell for each of the following cells. Enter your answer with 3 significant digits. Enter scientific notation as 1.23E4. (a) Mn(s) | Mn2+(0.11) M || Cr3+(0.24 M), Cr2+(0.11 M) | Pt(s) ____________ (b) Mg(s) |

asked by sabrina: on November 30, 2012
83. ## CHEMISTRY

18cm^3 of 1.0M H2SO4 just reacted with 24cm^3 of 1.5M NaOH to form sodium sulfate & water. Calculate the amounts in moles of sulfuric acid & sodium hydroxide reacting & write an equation for the reaction.

asked by Janey on October 12, 2013
84. ## chemistry

Suppose of copper (II) nitrate is dissolved in of a aqueous solution of sodium chromate. Calculate the final molarity of nitrate anion in the solution. You can assume the volume of the solution doesn't change when the copper (II) nitrate is dissolved in

85. ## CHEMISTRY

An ethanol-water solution is prepared by dissolving 10.00 ml ethanol C2H5OH (density=0.789g/ml) in sufficient water to produce 100.00 ml of solution with a density of 0.982g/ml. What is the concentration of ethanol in this solution? Expressed as ml.

86. ## Chem!!

Consider the dissolution of CaCl2: CaCl2(s) -----------> Ca2+(aq) + 2Cl-(aq) ΔH=-81.5 kJ/mol An 11.0 gram sample of CaCl2 is dissolved in 125 g water with both substances at 25.0 °C. Calculate the final temperature of the solution assuming the solution

asked by Bob on November 2, 2011
87. ## Chemistry

A solution containing Pb2+ and a solution containing IO3- are poured together and quickly mixed. After mixing, the solution contains 0.0030 M Pb2+ and 0.040 M IO3-. Immediately Pb(IO3)2(s), which has Ksp=2.510-13, begins to precipitate. Calculate the free

asked by Tanner on March 5, 2012
88. ## RE: PHYSICS

A stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction, where they stop. Piece L, with a mass of 2.0 kg, encounters a coefficient of kinetic friction µL = 0.40 and slides to a stop in

asked by COFFEE on February 26, 2007
89. ## To think about and anwer

Do you believe what you believe is really real? Explain.

asked by Food4thought... on September 8, 2007
90. ## math

What is the real part of (2+i)(6−i)?

asked by ayan on April 24, 2013

If f(x)=1.7x^5-5.3x^2+9.8 and if r is the only real number such that f(r)=0, then r is between a. -1.4 and -1.3 b. -1.3 and -1.2 c. -1.2 and -1.1 d. -1.1 and 0 e. -1.0 and -0.9

asked by Anonymous on March 12, 2012
92. ## Algebra

Let f(x)=x^2+4x-31. For what value of a is there exaclty on real value of x such that f(x)=a? Thank you!

asked by Trish Goal on October 23, 2014
93. ## chemistry

what is real gas ?

asked by shashi ranjan on February 17, 2013
94. ## Alg. II/Trig

If m and n are real numbers, i^2=-1, and (m-n)-4i=7+ni, what is the value of m?

asked by Lily on November 18, 2011
95. ## MATH

THANK YOU FOR HELP ME SO MUCH ON MY HOMEWORK I REAL appreciate it

asked by alex on April 15, 2014
96. ## History

Are ninjas real?

asked by Gisele ;D on October 17, 2011
97. ## Algebra

What are the real zeros of y = (x + 3)^3 + 10?

asked by Anonymous on February 6, 2017
98. ## Math

the real value of w^21 + w^22 + w^23 is? please help, :( i need an explanation..

asked by math help 3 on August 28, 2012
99. ## maths

For all real x, the minimum value of 1-x+x2/1+x+x2 is

asked by chotu on August 2, 2010