# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,718 questions, page 550
1. ## physics

The system of small objects shown in the figure below is rotating at an angular speed of 2.0 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened to 0.15

asked by mark on April 5, 2016
2. ## chemistry

The specific heat capacity of gold at 25°C is 1.290×10-1 J/g/K. For a 5.25×102 g sample of gold, how much will the temperature increase if 6.908×102 J of energy is put into the system? (Assume that the heat capacity is constant over this temperature

asked by korko on September 25, 2014
3. ## Physics!

A 20 kg square slab with side lengths 3.0 m rotates around an axis perpendicular to the slab. A particle of mass 0.60 kg sits on each of the corners of the square. Also, a particle of mass 0.80 kg sits at the center of each of the edges. What is the moment

asked by Lilly on June 9, 2012
4. ## HCA/220

Hello, I am working on an assignment and I am stuck. Was wondering if you can help? This assignment states: determine the primary function of the following system components. Then states Function- What is the type of muscle movement involved with each

asked by Nikol on October 28, 2010
5. ## chemistry

Calculate the freezing point of a solution contaning 5.0 grams of KCl and 550.0 grams of water. answer is -0.45 C but i don't know how to get here

asked by Paloa on October 4, 2012
6. ## chemistry

If you made up a solution of NaOH by adding 0.010 mole of solid NaOH to 1.0 liter of distilled water, what would be the concentration of the OH-(aq)?

asked by carli on April 29, 2013
7. ## chem

The solubility product of Mg(OH)2 is 1.2 x 10^-11. What minimum OH- concentration must be attained (for example, by adding NaOH) to decrease the Mg concentration in a solution of Mg(NO3)2 to less than 1.0 x 10^-10 M (molar)?

asked by Mischa on November 1, 2008
8. ## chemistry

How many mL of 0.250 M MgCl2 must be added to 350.0 mL of 0.250 M NaCl to produce a solution in which the concentration of chloride ion is 0.300M Cl-?

asked by Holly on August 30, 2011
9. ## Chemistry

Can calcium hydroxide solution be used to distinguish Co(NO3)2 and Fe(NO3)3 solutions using only the titration technique? Justify your answer with an explanation.

asked by Ella on September 23, 2013
10. ## Chemistry

I have two questions that I do not know how to answer. Thanks for your help! 1. Calculate the [OH^-], [H^+], pH, and pOH for a 0.50M solution of CN^- 2. Calculate the molar solubility of PbCl2 in 0.40M KCl

asked by Liz on January 11, 2015
11. ## chemistry

the concentration of urea (MW=60.0g/mol) in a solution prepared by dissolving 23g of urea in 64g of H2O is ____ molal

asked by Lanna on August 19, 2018
12. ## Science-Chemistry

Calculate the number of grams of carbon dioxide that can be absorbed by a complete reaction with a solution that contains 5.00 grams of sodium hydroxide

asked by Kelsey on December 2, 2010
13. ## chemistry

Find the pH during the titration of a 20.00mL of 0.1000 M butanoic acid, CH3CH2CH2COOH (Ka=1.54 x10^-5), with the addition of 10 mL of 0.1000 M NaOH solution??

asked by anonymous on April 9, 2012
14. ## chemistry

IF 10ml of H2SO4 is need to neutralize 20ml of 1N NaOH, how many milliliters of H2SO4 is needed to make 1 liter of 11M solution?

asked by sp on September 8, 2010
15. ## chemistry

You wish to prepare a 10% CaCl2 solution. Only CaCl2 * 10H2O is availalbe. How many grams of the hydrated compound are required for 250ml of the reagent? Ca=40 Cl=35.5

asked by j on September 5, 2010
16. ## Chemistry

When one of the following substances is dissolved in water, the only positive ions in the solution are hydrogen ions. NaOH NaH H2S Nh3

asked by Christian on February 25, 2012
17. ## Chemistry

A 4g sugar cube(sucrose: C12H12O11) is dissolved in a 350ml teacup of 80 degree water. what will be the molality of the sugar solution.

asked by Evans on May 10, 2018
18. ## chemistry

What mass of KCl \rm KCl is needed to precipitate the silver ions from 13.0mL mL of 0.200 M M AgNO 3 \rm AgNO_3 solution

asked by Anonymous on September 29, 2013
19. ## chemistry

What mass of benzoic acid CH6H5COOH, would you dissolve in 400.0 mL of water to produce a solution with a pH= 2.90? Ka= 6.3 x 10^-5 mass in grams is needed.

asked by papermate on April 11, 2011
20. ## Math

start with the word RODE. change one letter at a time to form a new until u have the word FILM. the best solution has the fewest steps.

asked by walter on December 16, 2010
21. ## Chemistry

Considering the effect of ionic strength, calculate the solubility of BaSO4 in 0.100 mol/L NaCl solution Ksp of BaSO4 = 1.1 X 10^-10

asked by Patel on October 20, 2008
22. ## chemistry

What is the final concentration (in M) of 17.6 mL sodium chloride solution with an initial concentration of 1.86 M which is diluted with 18.9 mL of solvent? Assume the volumes are additive.

asked by Anonymous on April 12, 2012
23. ## Chem II

Ammonia is a weak base. If Ammonium nitrate is added to it, the pH of the ammonia solution will _____________ (increase, decrease, stay the same)

asked by Ken on April 14, 2008
24. ## Chemistry

How does one calculate the pH of a solution that is only 1.84% ionised? determine the concentration of the H+, which will be in a monoprotic acid, concentration * decimal percent. then determing pH in the normal way.

asked by Fiona on May 20, 2007
25. ## Chemistry

How long (in seconds) does it take to deposit 1.065e+001 g Zn on a steel gate when 2.375e+001 A are passed through a ZnSO4 solution?

asked by Jon on January 11, 2015
26. ## Chemistry

h2so4 is labelled as 9.8 by weight. specific gravity of h2so4 is 1.8. the volume of acid to be taken to prepare 100 ml of 0.18M solution is?

asked by Anonymous on September 3, 2017
27. ## chemistry

Given that a 0.160 M HCl(aq) solution costs $39.95 for 500 mL , and that KCl costs$10/ton, which analysis procedure is more cost-effective?

28. ## chem

A 120.0 mL buffer solution is 0.105 M in NH3 and 0.135 M in NH4Br, What mass of HCl could this buffer neutralize before the pH fell below 9.00?

asked by moe on October 25, 2010
29. ## Chemistry

Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 2.640. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. I need to know what equations to use to find the answer not just how to get it

asked by Sonya on February 23, 2014
30. ## Chemistry

If a chemist titrates 120.0 mL of NaOH with a 5.0 M solution of HCl and requires 56.0 mL of the acid to reach the endpoint, what is the concentration of the NaOH?

asked by Anonymous on February 17, 2012
31. ## Chemistry

If I spill 100ml of a .5 M H3PO4 solution, how many grams of NaOH should be dissolved in water and added to the spill to neutralize the acid?

asked by Loretta on October 10, 2012
32. ## Chemistry

Calculate the mass percent of a NaCl solution in which 158g of NaCl is dissolved in 3.81L of water at 25 ∘C (density = 0.997 g/mL).

33. ## Chemistry

To what volume must 10ml of 5M HCl be diluted to make a 0.5M HCl solution......???? A.1ml B.50ml C.100ml D.500ml E.1000ml

asked by Sawera on October 29, 2016
34. ## science..chemistry

given the solubility product;Ksp,of calcium hydroxide is 0.0000064M,caculate its solubility at this temperature in i.water ii.0.1M calciumchloride solution

asked by kange on April 26, 2012
35. ## Chemistry

What is the molarity of each ion present if 18.0 g of Al2(SO4)3 is present in 201 mL of solution? _____ M Al3+ _____M SO42-

asked by Anonymous on October 28, 2016
36. ## Chemistry

What is the molarity of each ion present if 18.0 g of Al2(SO4)3 is present in 201 mL of solution? _____ M Al3+ _____M SO42-

asked by Anonymous on October 28, 2016
37. ## math

A 12-meter high post casts a 19-meter shadow. Find the angle of elevation to the sun. -what is/are given? -formula used -solution

asked by Daniela on February 20, 2017
38. ## Chemistry

How many grams of sucrose (C12H22O11) must be dissolved in 60 g water to make a solution in which the mole fraction of sucrose is 0.2? Answer in units of g.

asked by Cheyenne on September 23, 2010
39. ## Chemistry

Calculate the molar mass of a molecular compound if a solution of 6.70 g of the compound in 22.60 g of water boils at 100.78 degrees C (at 760mmHg).

asked by chemwizard on February 23, 2017
40. ## chemistery

the mass percent of a solution prepared by dissolving 0.500 moll KCL ( Molar mass = 74.6 g) in 850 g of water is ?

asked by ogb on December 9, 2012
41. ## chemistry

Determine the molarity of nitrate ions in a solution prepared by mixing 25.0 mL of 0.50 M Fe(NO3)3 and 35.0 mL of 1.00 M Mg(NO3)2 Please explain fully do not know where to start?

asked by Lisa on December 13, 2010
42. ## Chemistry

Calculate the volume 0.1 M of acetic acid and 0.1 M sodium acetate required to prepare 300 mL of 0.05 M acetate buffer solution at pH 5.5.

asked by Anonymous on October 26, 2015
43. ## Chemistry

What is the pH change of a 0.220M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.155M with no change in volume?

asked by Samantha on June 16, 2015
44. ## Chemistry

What minimum number of moles of NH4Cl must be added to 1.0 liter of solution that is 0.10 M in Mg(NO3)2 and 1.0 M in NH3 to prevent precipitation of Mg(No3)2?

asked by Ana on October 24, 2010
45. ## Chemistry

If I spill 100ml of a .5 M H3PO4 solution, how many grams of NaOH should be dissolved in water and added to the spill to neutralize the acid?

asked by Loretta on October 10, 2012
46. ## Chemistry

If a chemist titrates 120.0 mL of NaOH with a 5.0 M solution of HCl and requires 56.0 mL of the acid to reach the endpoint, what is the concentration of the NaOH?

asked by Spacy1996 on February 17, 2012
47. ## AP Chemistry

How many grams of sucrose (C12H22O11) must be dissolved in 60 g water to make a solution in which the mole fraction of sucrose is 0.4? Answer in units of g.

asked by Matt on September 19, 2012
48. ## Chemistry

What is the pH of a 1.24 mol/L solution of HCN(aq) if its Ka = 6.2 x 10^-10? I am not sure how to this question... I did 6.2x10^-10/ 1.24?? I am not sure if it is right OR are we suppose to find the Kb value which i already did Kb= kw/ka =

asked by Lloyd on April 10, 2008

Can somebody please help me I don't understand this problem.? Determine whether each ordered pair is solution of y=x+3. 1. (2, 9) 2. (5, 23) can you please explain this to me step by step till you get the answer .thank you so much.

asked by jenn k on August 22, 2013
50. ## physics

A 2-kilogram ball is accelerated from rest to a speed of 8 m/sec. What is the ball`s change in momentum? Looking for? Given? Relationship?(formula) Solution?

asked by mya on November 18, 2014
51. ## Biochemistry

Calculate the ph of a 1L solution to wgich has been added 25ml of 10mM acetic acid and 25ml of 30mM sodium acetate

asked by Grace on July 23, 2017
52. ## math

Please anyone to help the solution and the answer# A piece of copper wire is 52 2/3 m long. If each piece has been cut of 3/4 m from it. What length will remain after cutting pieces?

asked by kelvin on July 23, 2018
53. ## Chemistry

If the osmotic pressure of urea (CH4N20) in water is measured at 0.0259 atm at 25 degress C what is the molartiy of the urea solution?

asked by Shelly on December 10, 2012
54. ## algebra 2

a. find the value of the discriminant b. describe the number and type of root c. find the exact solution by using quadratic formula 1. p^2+12p=-4 2. 9x^2-6x+1=0 3. 2x^2-7x-4=0

asked by Reina Bonilla on December 14, 2014
55. ## Chemisty

if the chemist mistakenly makes 275 ml of solution instead of the 200ml, what molar concentration of sodium nitrate will the chemist have actually prepared

asked by Jayla on February 16, 2017
56. ## chem

A hydrofluoric acid buffer solution has the following concentrations: [HF]=0.43M [F-]=0.45M If 40 mL of 0.1M NaOH is added to 500 mL of the buffer, what is the resultant pH?

asked by Jess on April 19, 2012
57. ## chemistery

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 11.0 of luminol into a total volume of 75.0 of .

asked by Anonymous on September 25, 2010
58. ## chemistry

Calcium chloride, CaCl2, has been used to melt ice from roadways. Given that a solution is 25% CaCl2 by mass, estimate the freezing point.

asked by Akkam on December 20, 2010
59. ## Operations research

36) Consider the following minimization problem: Min z = x1 + 2x2 s.t. x1 + x2 ≥ 300 2x1 + x2 ≥ 400 2x1 + 5x2 ≤ 750 x1, x2 ≥ 0 What is the optimal solution?

asked by Pauline on December 12, 2010
60. ## Chemistry

What is the freezing point of each solution? a)1.40mol Na2SO4 in 1750 g H2O b)0.060 mol MgSO4 in 100g H2O

asked by Jack on April 29, 2010
61. ## chemistry

In a 1.0x10^-4 M solution of HClO(aq), identify the relative molar amounts of these species:HClO, OH-, H3O+, OCl-, H2O

asked by karla on October 12, 2012
62. ## Chemistry

What is the osmotic pressure of a 50% sucrose solution at a temperature of 37 degrees celcius with a molar mass of sucrose of 342.30 grams

asked by Ruffles on December 4, 2013
63. ## math

What does "give a brief explanation as to what kind of solution(s) you expect the linear equation to have: 18x+1/2=6 (3x+25). Transform the equation into a simpler form if necessary" mean?

asked by Samantha on January 23, 2014
64. ## Biology

Need to write a brief description of the procedure required to make 900mL of a 0.5 M NaCl solution. The formula weight of NaCl is 58.4g/mole.

asked by Debbie on September 23, 2012
65. ## chemistry

How many milliliters of a 0.16 M HCl solution are needed to react completely with 4.8 g of zinc to form zinc(II) chloride? Answer in units of mL

asked by cheri on September 19, 2012

a^2 - 10ab + 3b^2 *I need a lot of help with this.How do I do this one.? Try: (a + r b)(a + s b) Then: r + s = -10 r*s = 3 From the first equation: s = -(10 + r) Inserting in second expression: r*(10 + r) = -3 --> r^2 + 10 r + 3 = 0 ---> r = 5 +/-

asked by [C]razy Baby.-[iloveyou] (Margie) on February 9, 2007
67. ## chemistry

If the mole fraction of sulfuric acid (H2SO4) in an aqueous solution is 0.325, wat is the percent by mass of H2SO4?

asked by Lola on May 23, 2010
68. ## Chemistry

A 100.0 ml sample of .50 M HCl (aq) is titrated with a .10 M NaOH. What volume of the NaOH solution is required to reach the endpoint of the titration?

asked by Arianna on March 13, 2012
69. ## chemistry

Need to write a brief description of the procedure required to make 900mL of a 0.5 M NaCl solution. The formula weight of NaCl is 58.4g/mole.

asked by Debbie on September 24, 2012
70. ## chem

How many grams of NaOH must be dissolved in water to make 750ml of 1.7 M solution? (molecular weight of NaOH = 4Og/mol)

asked by nero on May 11, 2012
71. ## chemistry

A 600ml sample of a saturated solution of MgCO3 is reduced to 125 ml by evaporation. What mass of MgCo3 is formed? Ksp=4*10^-5

asked by maureen on March 25, 2012
72. ## chemistry

Determine the maximum mass of calcium iodate that can be dissolved in a 10.0L jug of 3.25x10^-2 molar calcium sulphide solution.

asked by Kayleigh on January 29, 2013
73. ## chemistry

How many grams of KCl are required to make .75 L of 0.29 M solution? Round to one decimal place. i got .2907 is this correct im not sure about the decimal places thanks

asked by amber on October 4, 2010
74. ## Chemistry

An aqueous solution of volume 7 dm3 is obtained by dissolving 5.5 kg of C12H22O11 in enough water. express the concentration in mol/L and mol/Kg

asked by Susan on May 10, 2012
75. ## chemistry

Calculate the mass percent concentration of a solution made by dissolving 5.00g of NaCl in 25.0g of water? I got 5.00g/25.0g=0.2 x 100= 20% Is this right?????

asked by Sarah on November 21, 2011
76. ## chemistry volume problem

Can someone please explain to me how to do this?! I am completely lost. Calculate the volume indicated for each of the following: liters of a 2.00M KCl solution to obtain 0.600mol of KCl.

asked by chelsea on November 6, 2013
77. ## Chemistry

A solution consisting of 25.00 g Nh4Cl in 178 ml of water is titrated with 0.114M KOH. How many mL of KOH are required to reach the equivalence pt?

asked by Ashley on March 24, 2011
78. ## Chemistry

An aqueous solution of volume 7 dm3 is obtained by dissolving 5.5 kg of C12H22O11 in enough water. express the concentration in mol/L and mol/Kg

asked by Susan on May 13, 2012
79. ## math

What does "give a brief explanation as to what kind of solution(s) you expect the linear equation to have: 18x+1/2=6 (3x+25). Transform the equation into a simpler form if necessary" mean?

asked by Samantha on January 23, 2014
80. ## Chemistry Homework

Hello! Could someone help me with this? I'm confused on what to do. Thanks!! The mole fraction of carbon dioxide (CO2) in water is 0.25. Determine the molarity of CO2. The density of the solution is 1.0 g/mL.

asked by Amber on April 5, 2017
81. ## Chemistry

The concentration of fluoride ions in a saturated solution of barium fluoride is __________ M. The solubility product constant of BaF2 is ???

asked by Jane on December 2, 2014
82. ## chemistry

i need help with finding the ph of a buffer solution initially consisting of 0.0400 moles NH3 and 0.025 moles NH4^+ and 20 ml 0.75 NaOH. ka of NH+4 = 5.6 ×10^-10

asked by joelle on March 19, 2012
83. ## math

ms.pritchard wrote the following inequality on the board 5.6 with the sign greater on equal to then negative fourteen what should be the solution set for the inequality

asked by brooke on February 27, 2011
84. ## chemistry

i need help with finding the ph of a buffer solution initially consisting of 0.0400 moles NH3 and 0.025 moles NH4^+ and 20 ml 0.75 NaOH. ka of NH+4 = 5.6 ×10^-10

asked by joelle on March 19, 2012
85. ## chemistry

If 0.2g of iodine is stirred in 100cm3 of water at 298k till equilibrium is reached what will be the mass of iodine found in solution

asked by saquib on May 26, 2015
86. ## math

How many of the first 1001 Fibonacci numbers are divisible by 3? I know the correct answer is 250....... but i need solution of how it comes out to be 250........ kindly hellp me sooooooooooon

asked by jamesbond on May 12, 2013
87. ## chemistry

25.0g of 5.0% (by mass) acetic acid solution are titrated with 0.300 M NaOH. What volume of NaOH will be needed to neutralize this sample?

asked by Cynthia on May 28, 2010
88. ## chemistry

What mass of silver nitrate (AgNO3) is re- quired to prepare 400 g of a 3.50% solution of AgNO3? 1. 14 g 2. 0.00875 g 3. 114.28 g 4. 1400 g

asked by cheri on September 19, 2012
89. ## AP Chemistry

How many milliliters of a 0.62 M HCl solution are needed to react completely with 4.7 g of zinc to form zinc(II) chloride? Answer in units of mL

asked by Gabriella on September 10, 2013
90. ## Chemistry

how many milliliters of a 0.78 M HCl solution are needed to react completely with 6.4 g of zinc to form zinc(II) chloride? Answer in units of mL.

asked by Nathan Espinosa on October 5, 2010
91. ## chem

calculate the solubility of barium sulfate (Ksp=1.1x10^-10) in a) water b) a 0.10 M barium chloride solution help is GREATLY appreciated

asked by brooke on March 18, 2012
92. ## Chemistry

Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic metal. M(OH)2 (s) M^2+ (aq) + 2OH- (aq) Ksp=4e-16 M(OH)2 (s) + 2OH- (aq) M(OH)4 ^2- (aq) Kf=0.06 Estimate the solubility of M(OH)2 in a solution buffered at pH= 7.0, 10.0, and 14.0 I'm not

asked by anon on May 9, 2012
93. ## Chemistry

If the Ka of a monoprotic weak acid is 4.5x10^-6 what is the pH of a .10M solution of this acid. I don't even know how to start this problem, I'm totally lost please help!

asked by Molly B on July 13, 2013
94. ## History

What things need to be considered in finding a solution for the oil problem in the Middle East? What obstacles are there in solving the oil issue?

asked by Christian on February 25, 2008
95. ## Chemistry

Hi! I am totally stuck on this question: Explain why a cool flame is important to use in heating a solution to dryness. Can you please explain to me exactly why because I really do not understand. thank you!

asked by Abigail on September 9, 2015

asked by Deborah on February 1, 2013
97. ## Math

Calculate the sum from k=1 to infinity (or n) of (k^4)- (k-1)^4 It says that the solution is n^4, but I do not know why, I tried separating it in a telescoping sum, and expanding it, but I obtain at the end more values than expected. Please help

asked by Amy on November 13, 2018
98. ## chem

Determine whether Cd^2+ can be separated from Zn^2+ by bubbling H2S through a 0.3 M HCl solution that contains 0.005M Cd^2+ and 0.005 M Zn ^2+. Ksp for CdS is 8*10^-7. Ksp for ZnS is 3*10^-2

asked by coleman on December 15, 2010
99. ## Chemistry

Hydrocyanic acid has a Ka of 4.0 X 10-10. What is the percent of ionization of a 1.0 molar solution? my answer is 0.004% is this correct? a) 0.004% b) 0.0020% c) 0.0004% d) 0.02%

asked by Centhia on May 10, 2010
100. ## chemistry

For the following reaction in acidic solution. Cr2O7^2- + I- ---> Cr^3+ + IO3- give the balanced half reduction reaction. Indicate the oxidizing species.

asked by Annie on June 17, 2013