# 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 497
1. ## biology

If an elodea leave is place in pure distilled water, what will happen? plus will this be isotonic or hypertonic or hypotonic solution.

asked by Ceci on March 15, 2011
2. ## chemistry

when 12.5mL of 0.28M HNO3 and 5.0mL OF 0.46M Ba(OH)2 are mixed, is the resulting solution acidic, basic, or neutral?

asked by Jon on March 13, 2011
3. ## Biology

What will happen to human red blood cells (crenate, lyse, or no change) if they are placed in the following solutions? 20% NaCl solution

asked by Anna on January 28, 2012
4. ## Algebra 1

Graph the function f(x)= 1/4x+12. Thank you. Someone answered this question, but I did not understand their explanation. Thank you for yor patience and for being clear in explaining the solution.

asked by Esther on January 15, 2011
5. ## chemistry

in my text book it says that if the calculated value is less than or equal to 0.1 then the color of the conjugate base (In- in this case) predominates. does this mean that the solution will be yellow then?

asked by George on July 18, 2010
6. ## chemistry

calculate the amount of solid NH4Cl to add to 50 mL of 1 M to form a mixture that has a pH of 9 assume no volume change in the solution

asked by maycee on October 6, 2010
7. ## Chemistry 11

What volume of 2.33 M of sodium hydroxide solution is needed to fully neutralize 1000.0 cm3 of 17.6 M hydrobromic acid?

asked by Dawn on July 19, 2018
8. ## Chemistry

What would happen if you insert an iron nail in the zinc nitrate solution? Explain and write the reactions that take place.

asked by Anonymous on August 19, 2010
9. ## chemistry 2

how many grams of calcium nitrate need to be dissolved in 250 mL of water to form a solution that has a freezing temperature of -3.2 degrees C

asked by Anonymous on January 13, 2011
10. ## MATH213

A student claims that the equation√-x=3 has no solution, since the square root of a negative number does not exist. Why is this argument wrong?

asked by Rebecca on January 18, 2010
11. ## science

calculate the mass in mg of solid chromium nitrate needed to make 250 ml of an aqueous solution with a pH OF 4.00. The Ka of [cr(H2O)6]+3 IS 1.0*10-4.

asked by ashok on September 15, 2014
12. ## Math

1.76g of sodium hydroxide was added to 50cm^3 of 0.025mol.l^-1 nitric acid. Calculate the pH of the resulting solution.

asked by Rey on December 30, 2016
13. ## chemistry

what is molar concentration of a solution obtained by dissolving 560cm of hydrogen chloride gas at s.t.p in 92.5cm of water

asked by faith on January 26, 2012
14. ## chemistry

calculate the ionisation constant of the conjugate base of a solution made from 0.20M HC2H3O2 AND 0.50M C2H302.

asked by laze on March 31, 2012
15. ## Chemistry

This is the last one Dr Bob! How much concentrated 18 M sulfuric acid is need to prepare 250 ml of a 6.0 M solution? Im stumped again, could you point me in the right direction ? Thank you sir!

asked by Alan on May 28, 2009
16. ## Chemistry

100g of a saturated solution of sodium nitrate at 43°C is cooled quickly with stirring to 10°C. How many grams of the solute will crystallize?

asked by Veronica on April 8, 2012
17. ## trigggggg

find, to the nearest minute, the solution set of 1- sin x = 3 cos^2 x over the domain 0 degrees to 360 degres

asked by Clarkney on May 17, 2010
18. ## chemistry

Calculate the mass of solid which will be precipitated when 35g of carbon(iv)oxide are passed through a solution of calcium hydroxide

asked by Esther on August 26, 2017
19. ## Chem 151 - help

Write the balanced equation for the neutralization reaction between H2SO4 and KOH in aqueous solution. Phases are optional.

asked by Anonymous on July 14, 2012
20. ## Chemistry

What mass of sodium benzoate should you add to 150.00 ml of a 0.15M benzoic acid solution to obtain a buffer with a pH of 4.25?

asked by Cooper on March 28, 2012
21. ## chemistry

A Solution contains a mixture of Cl- and Br- ions. Can both be positively identified? Briefly explain. Write appropriate equations to support your answer.

asked by Anonymous on March 29, 2012
22. ## Chemistry

Calculate the pH, to one decimal place, of the solution made by mixing 21.0 mL of 0.33 M HNO3 with 121.0 mL of 0.32 M formic acid (HCOOH)

asked by Megan on October 7, 2010
23. ## Chemistry

How many grams of nickel (II) chloride must be added to 1.50 L of a 0.500 M sodium sulfide solution to precipitate out all of the product of interest?

asked by Bella on February 21, 2012
24. ## Chemistry.

Calculate the pH of the resultant solution when 40.00 mL of 0.250 M H2SO4 are mixed with 30.00 mL of 0.450 M KOH. The answer says it is 1.032...I get 12.70 (and I subtract that from 14 I still only get 1.3) Thanks.

asked by Duffy on May 16, 2009
25. ## Linear Algebra

The nullspace of a 3 by 4 matrix A is the line through (2,3,1,0)? a. what is the rank of A and the complete solution to Ax=0? b. what is the exact row-reduced echelon form R of A?

asked by Fatih on April 7, 2012
26. ## Algebra

m+3 over 3m, divided by 6m over m+3 Would the solution be 1 over 18m? It doesn't seem right to me; I canceled out the two "m+3"'s before I changed the sign to multiplication and created a reciprocal of the second term..

asked by Anonymous on September 23, 2009
27. ## Chemistry

what is the precipitate formed when benedicts solution reacts with glucose? give the net ionic equation for the reaction.

asked by Mark on June 7, 2010
28. ## more chem

What is the pH that would result from the addition of 0.002 moles of HCl to 100 mL of a 0.1 M boric acid/borate, pH= 9.2 buffer solution?

asked by Anthony on February 7, 2008
29. ## Chemistry

find the freezing point of a solution containing 3 grams of a compound of molar mass 125 g/mol in 45 g of camphor

asked by Ann on March 17, 2014
30. ## chemistry

50.0cm^3 of 2.0 mol dm^-3 aluminium sulphate,Al2(SO4)3 solution Calculate the number of moles of ions.

asked by mandy on May 7, 2014
31. ## Chemistry

How do I find the volume of 6M stock solution of acetic acid needed to make a 250 mL buffer at a pH 4.7? pka is 4.74

asked by Jenny on February 28, 2011
32. ## Math

I am in dire need of assistance. Can anyone tell me the forumula/solution to transforming inqualities into equivalent inequalities with y alone on one side? I really don't understand this.

asked by Krys on October 18, 2007
33. ## chemistry

A 33.4 g sample of a nonelectrolyte was dissolved is 680. g of water. The solution's freezing point was -2.89°C. What is the molar mass of the compound?

asked by ted on May 28, 2019
34. ## chemistry

Calculate the mass of salt needed to prepare 100 cm3 of 0.05 M solution of: (i) Fe(NH4)2(SO4)2.6H2O

asked by ronika kumar on September 23, 2015
35. ## Chemistry

What would be the freezing and boiling points of a solution prepared by dissolving 1.00g of benzoic acid (C6H5CO2H) in 10.0g of benzene?

asked by Jaques on May 9, 2014
36. ## ilays high school

what is a volume 2 mole of hydrochloric acid will neutralize 25 cent meter cubic of sodium carbonate solution

asked by dalmar falaash on December 7, 2014
37. ## chemistry

what will be the pH change when 20 mL of .1M NaOH is added to 80 mL of a buffer solution consisting of .164M NH3 and .187M NH4Cl? Pka 9.25

asked by anonymous on December 4, 2010
38. ## Molarity

Determine the molarity and normality of a solution prepared by dissolving 55 mg of sodium bicarbonate (NaHCO3) in 750 mL of water.

asked by joe on January 14, 2010
39. ## chemistry

the temperature of 50.0g of water changes from 28.5°C to 26.9°C when 1.00g of ammonium bromide, NH4br(s), dissolves. What is the molar enthalpy of solution for this compound?

asked by Anonymous on November 17, 2012
40. ## Chemistry

Calculate the molecular mass of sulphur if 35.5 g of sulphure dissolves in 1 00 g of CS2 to produce a solution that has a boiling point of 49.48 c.

asked by Ethio on November 2, 2011
41. ## Chemistry

Which metal would you expect to generate more gas when exposed to a weakly acidic solution, K or Ca? I say K because it only needs to lose one electron. Is this true?

asked by George on September 24, 2008
42. ## chemistry

How many milliliters of 0.300 solution are needed to titrate 2.438 of according to the equation below? I_2+2S_2O_3^-2->S_4O_6^-2+2I_-

asked by Sarah on October 7, 2010
43. ## AP Chem

Write the net ionic formula. A bar of strontium metal is immersed in a 1.0 M copper (II) nitrate solution. How do I go about doing this?

asked by Needs help on October 3, 2007
44. ## math 1

explain what the solution to the equation f(x)=g(x) means, both graphically and algebraically. I have no idea what this question is asking but like I do know that f(x) has to do with next now rules correct? Please help im desperate

asked by jaedin on December 13, 2017
45. ## G-Chem

How man grams of Fe+3 are required to make 1.0L of an aqueous solution of 10 ppm Fe+3: (Assume the densit of water is 1.00g/mL)

asked by Margaret on October 5, 2011
46. ## chemistry

A salt was completely solbuble in water when this solution was treated with AgNO3 no precipitate was formed. What anions could be present?

asked by Helen on November 18, 2012
47. ## chem

what is the Ka for a 0.1994M propionic acid solution if pH is 2.795? CH3CH2CO2H(aq)+H2O(l)CH3CH2CO2-(aq)+H3O(aq) someone please help.. I have a final in two days.

asked by manda on May 10, 2010
48. ## biology

movement of water molecules across the cell membranes from hypertonic to hypotonic solution . whether it is osmosis or diffusion?. please clarify.

asked by ramesh reddy on October 12, 2013
49. ## chemistry

What is observed when excess sulfur dioxide is bubbled into a solution of sodium hydroxide containing red litmus paper

asked by shakira on August 22, 2017
50. ## chemistry

If not all the alum dissolves in the water before adding the Ba(NO3)2 solution, what effect will this have on the sulfate percent error determination?

asked by s on November 4, 2018
51. ## Chemistry

a 0.1 gm sample requires 20.5 ml B for reaction. the B was standardized by titrating 25 ml of a 0.1M CaCl2 solution, requiring 30 ml B. calculate the percent Al2O3

asked by 7aji on August 15, 2016
52. ## Chemistry

Using half reactions, write the equation for MnO4- reacting with H2O2 in acid solution to give Mn2+ and O2

asked by Tammy on May 4, 2012
53. ## Chemistry

Calculate the freezing point depression of an aqueous solution prepared by mixing 22.0 g C6H12O6, with 600 ml of water

asked by Kristen on February 20, 2012
54. ## Chemistry (Acid&Base)

How many mL of 0.203 M HCl(aq) are required to prepare a diluted solution that has a concentration of 0.0433 M in a 100-mL volumetric flask?

asked by Bill on November 16, 2014
55. ## chemistry

calculate the mass of potassium hydrogen phthalate which must be dissolved in water to make 500ml of a 0.2000M solution

asked by nelia on November 3, 2012
56. ## chemistry

Use the Henderson-Hasselbalch equation to calculate the pH of a solution that is 0.140M in propanoic acid and 0.120M in potassium propanoate

asked by Anonymous on November 23, 2014
57. ## Chem

How long must a current of 1.20 A pass through a sulfuric acid solution in order to produce 25.0 mL of H2 gs at 25 degrees C and 1 atm pressure?

asked by Josh on July 18, 2012
58. ## chemistry

calculate the mass of solid which would be precipitated when 35g of carbon(IV)oxide are passed through a solution of calcium hydroxide

asked by shola on October 18, 2018
59. ## chemistry

Write an equation for the reaction that take place in hydrogen sulphide gas when bubbled through a solution of zinc nitrate

asked by kennedy on January 4, 2017
60. ## chemistry

what quatity of electricity will liberate 0.125 mole of dilule sodium chloride solution？ (F=96500(mol-1)

asked by david on June 9, 2019
61. ## Chemistry

How many grams of nitric acid (HNO3) must be dissolved in 590 ml of water to make a solution with a pOH = 10.1? Select one: a. 2.9 x 10-9 g b. 7.9 x 10-3 g c. 4.7 x 10-3 g d. 7.9 x 10-6 g e. 7.4 x 10-5 g

asked by Bill on November 23, 2014
62. ## chemistry

What mass of glycerin (), a nonelectrolyte, must be dissolved in 200.0 g water to give a solution with a freezing point of –0.900°C?

asked by Amber on October 5, 2016
63. ## Chemistry

How many moles and number of ions of each type are present in the following aqueous solution? 113 mL of .490 M aluminum chloride.

asked by Tyler on October 4, 2011
64. ## Chemistry

how many grams of sodium acetate must be added to 135 mL of a .115M solution of acetic acid to produce a buffer of pH 4.75?

asked by Lisa on April 1, 2012
65. ## chemistry

What evidence supports classifying H2SeO3 as an acid? In a water solution, it turns blue litmus red.

asked by bex on February 27, 2007
66. ## College Algebra

Just so you guys know, I'm not trying to get the answers to all of my assignment. These problems I'm posting are the ones that I'm stuck on. 6(4-3x)+4x

asked by LeAnn/Please help me on November 18, 2009
67. ## Chemistry

Calculate the pH at the equivalence point in titrating a 0.120 M solution of NaHCrO4 (sodium hydrogen chromate) with 7.0×10−2 NaOH. Please help!

asked by Josh on November 20, 2010
68. ## chemistry

How many grams of solid ammonium chloride should be added to 1.50 L of a 0.224 M ammonia solution to prepare a buffer with a pH of 8.720 ?

asked by Zach on April 3, 2015
69. ## chemistry

How many grams of hydrogen peroxide (H2O2) must be added to 1,500 mL of water to produce a concentration of 1.33 m (molal solution)?

asked by Anonymous on July 8, 2013
70. ## Chemistry

How much ethyl alcohol, C2H5OH must be added to 500mL of water so that the solution will freeze at -10C? KfH2O = 1.86 C/molal

asked by Cielo on December 31, 2014
71. ## marketing

an ad that stresses "get the real proactiv solution accept no substitues is best geared for which stage of the product life cycle?

asked by lora on July 21, 2012
72. ## chemistry

Calculate the mass of sodium hydroxide needed to prepare 500 mL of a 0.10 M solution. I'm pretty sure the answer is 2 grams, but how do I get to that?

asked by Rebecca on October 14, 2007
73. ## Chemistry

A salt was completely soluble in water. When this solution was treated with AgNO3 no precipitate was formed. What anions could be present?

asked by Shines on October 15, 2013
74. ## Chemistry

What volume of distilled water should be added to 400cm3 of 2.0mol/dm 3 H2SO4 to obtain 0.20mol/dm3 of solution

asked by Joy on August 2, 2018
75. ## chemistry

how do i calculate the number of moles of ammonium iron (ll) sulphate (NH4)2 Fe(SO4)2.6H2O in 1dm3 of solution?

asked by jevoy on December 30, 2011
76. ## Chemistry

What is the pH of a solution prepared by mixing 24.6 g sodium acetate and 50 mL of 2.5 M acetic acid in a 500 mL flask and filling to volume

asked by Divine on March 21, 2014
77. ## Chemistry

Write net ionic equations for these reactions : Cu^2+ + Fe -> Hg^2+ + Fe-> Fe^3+ +Fe-> Pb^2+ +Fe-> Ag^+ + Fe-> and then the same but instead of Fe, addition of Cu to the six solution that I wrote before.. What ions are reacting in each case? please help me

asked by Carolina on May 9, 2010
78. ## Chemistry

Calculate the pH at the equivalence point in titrating a 0.120 M solution of NaHCrO4 (sodium hydrogen chromate) with 7.0×10−2 NaOH.

asked by Josh on November 20, 2010
79. ## chemistry (urgent)

Commercial breathalyzers contain .75 mg of K2Cr2O7, 1.5 mL of H20 and 1.5 mL of H2SO4. What is the concentraion of the dichromate in the solution?(hint:the acid is a solvent)

asked by Anonymous on February 27, 2011
80. ## Chemistry

If 5 ml of sulphuric acid is diluted to 135 ml of water, what is the volume and concentration of sodium hydroxide to neutralize the solution?

asked by Rachelle on May 8, 2018
81. ## SCIENCE

I NEED TO KNOW THE SYNONYMS OF THE FOLOWING WORDS. PROPERTY SOUND BOILING POIMT MELTING POINT MIXTURE SOLUTION

asked by rudy on October 3, 2007
82. ## chemistry

Calculate the mass of sodium hydroxide needed to prepare 500 mL of a 0.10 M solution. I'm pretty sure the answer is 2 grams, but how do I get to that?

asked by Rebecca on October 14, 2007
83. ## algebra

|x| + 5 = 18 5 or -5 13 or -13*** |y + 4| < 1 -5 < y < -3 -3 < y < 5***? -4 < y < 1***? 1 < y < 4 |2t| - 5 = 7 t = 1 or -1 t = 6 or -6*** t = 10 or -10 t = 12 or -12 |a| -3/4 = -5/8 1/8 or -1/8 7/8 or -7/8 1 3/8 or -1 3/8 no solution Please help!? Not good

asked by SkatingDJ on October 27, 2014
84. ## chemistry

How much water must be added to 440. mL of 0.204 M HCl to produce a 0.139 M solution? (Assume that the volumes are additive.)

asked by mary on April 4, 2013
85. ## Probability

Using standard deviation. Normally distributed mean of 0 degrees standard deviation of 1.00 degrees celcius. 1. between 0 and 1.28 2. greater than 0.37 3. less than -0.92 4. between 1.50 and 2.50 5. between -0.90 and 1.95 6. less than 0 I don't know how to

asked by Sue on December 5, 2006
86. ## English

Here goes my essay on interpersonal communication: being aware of of this fact, I proceed to find out what are my nonverbal listening pattern. To do so, I prepared a 500 word speech to be presened in less than half an hour to a small group of my church. In

asked by haydee on December 2, 2006
87. ## Economics/Calculus

Asher is a stay at home dad who provides math tutoring for extra cash. At a wage of \$30 per hour, he is willing to tutor 5 hours per week. At \$45 per hour, he is willing to tutor 6 hours per week. Using the midpoint method, the elasticity of Asher’s

asked by Jon on September 21, 2009
88. ## Economics

Asher is a stay at home dad who provides math tutoring for extra cash. At a wage of \$30 per hour, he is willing to tutor 5 hours per week. At \$45 per hour, he is willing to tutor 6 hours per week. Using the midpoint method, the elasticity of Asher’s

asked by Jon on September 21, 2009
89. ## math(help)

for questions 1-2,estimate the sum or difference.use the benchmarks 0,1/2,and 1. 1.23/40-9/30 A.0 B.1 C.1/2 2.simone measures the width of one cardboard strip as 1/2 yd.a second cardboard strip measures 5/6 yd in width.estimate the combined width of the

asked by darla on November 26, 2013
90. ## geography

1. Which of the following is an example of a refugee? a student who moves to Europe to study art a Jewish person who moves to America to escape the Nazis during World War II a family who comes to America to find work*** 2. Example of (an) immigrant(s)? a

asked by Carl Wheezer on April 27, 2017
91. ## math

if a sum of money doubles in 8 yrs, in how many years will it triple itself?Is the answer 16? If it is please tell me how to show the workings. I understood the concept but cannot express it.This is a simple interest sum.

asked by Susan on September 2, 2010
92. ## Math i dont understand

Window: [-4π , 4π , 1] [-10,10,1] State the Period, Amplitude, Phase Shift, Vertical Shift and Equation in cosine for #5 Number five is a graph is there a way i can show u it i think its valuable for the help on this question

asked by Tony on July 21, 2012
93. ## fINANCE

If you purchase a zero coupon bond today for 225 and it matures at 1000 in 11 years, what rate of return will you earn on that bond? Please show formula and answer

asked by Angel on October 30, 2008
94. ## discrete math

let d be a positive integer. Show that among any group of d+19not necessarily consecutive) integers there are two with exactly the same remainder when they are divided by d. The possible values of the remainders are 0, 1, 2, ...d-1. So there are a total of

asked by thisha on November 29, 2006
95. ## PHYSICS

2 people,1 with 3 times the mass of the other, attempt a tug-of-war on frictionless ice. Show that the heavier person will gain a speed 1/3 that of the lighter person.

asked by sherri on April 4, 2010
96. ## maths lit

If Mrs Ditiro's budget for transport, clothes and social expenses is R5 000,00, show by calculation that she can afford to invest R2 000,00 for her children per month.

asked by success on August 31, 2014
97. ## physics

Carmelita tosses a baseball straight up into the air and it returns to her glove in 3.0s. Show that she has to give the ball a vertical speed of 14.7 m/s if it is to return to her glove in that time.

asked by Daisha on February 12, 2011
98. ## Math

A solid rod of radius r cm and length l cm has a volume of 50pie cm cube . (i) show tha the total surface area if the rod is given by A = 2pieRsquare + 100pie / r

asked by Smartypants on June 18, 2011
99. ## General Chemistry

The Henry's Law constant for O2 in water is 1.28 x 10 ^ -3 M/atm. How many grams of O2 will dissolve in a 12 L fish tank on a day when atm is .977 and air is 18% O2? Show steps

asked by Sarah on December 11, 2010
100. ## physics

Starting from rest, a rope with a tension 30 N pulls a 2.0 kg box up a 2.0 m long, 30 degree smooth incline. What is the speed of the box at the top? Please show steps! Thanks

asked by Sidiqi on February 25, 2018