Please observe the solution for the following two problems : (a) 2x + 18 = x + 25 (b) 3x + 5 = 7x - 15 (a) 2x + 18 = x + 25 2x - x = 25 -

30,299 questions, page 48
1. general chem.

1. Sour pickles have a pH of about 3.00. The [OH –] in a typical sour pickle is 8. A solution of sodium hydroxide was prepared for a chemical analysis using 0.65 g in 500 mL. The hydrogen ion concentration in the solution is Use the information to answer

asked by !!! on June 18, 2006
2. chemistry

A student prepares a 2M solution of copper sulphate. She adds 17 mL of the solution to a 100 mL volumetric flask and dilutes it up to a final volume of 100 mL with water. What is the final molar concentration of the copper sulphate? How many moles of

asked by flona on November 8, 2010
3. Chemistry!!!~!!

A solution of sodium chloride in water has a vapor pressure of 18.5 torr at 25°C. What is the mole fraction of NaCl in this solution? What would be the vapor pressure of this solution at 48°C? The vapor pressure of pure water is 23.8 torr at 25°C and

asked by Jenn on April 19, 2010
4. Chemistry

Calculate the total pressure above 1.0L solution of a 1.42M CH3OH(aq) solution at 25 degrees(C). The vapor pressure of pure methanol at 25 degrees (C) is 127.1 torr and the vapor pressure of the pure water is 23.8 torr at 25 degrees(C. You may assume that

asked by Kayla on December 6, 2016
5. Microeconomics

Long-run average total costs curves are often U-shaped: A: For the same reasons that average total cost curces are often U-shaped. B: Because of constant returns to scales. C: Because of increasing coordination problems at low levels of production and

asked by Gigi on August 19, 2008
6. Chemistry Help ????

Experiment - Recrystallization of a solid Purpose in this experiment acetanilide will be recrystallized from water, which serves as the solvent.. Pre-Lab Questions.... Explain the purpose of the following in this experiment. a) using hot filtration b) not

asked by SARAH on November 23, 2008
7. CHEM

Mass percent is one way to represent solution concentrations, though not the only one. A common measure of solution concentration is Molarity; moles of solute per liter of solution. Calculate the molarity of vinegar in each sample that you titrated and

asked by Linda on March 18, 2015
8. Chemistry

An EDTA solution is standardised against high-purity CaCO3 by dissolving 0.4835 g CaCO3 in HCl, adjusting the pH to 10 with ammoniacal buffer and titrated with an EDTA solution. If 35.18ml were required for the titration, what was the molarity of the EDTA

asked by Daniel on January 11, 2015
9. math

How do you solve system of equations and tell if they're consistant and independant,consistant and dependent,and inconsistant? If you find no solutions then the system is inconsistent. Suppose you have N variables and M equations (N larger than or equal to

10. chemistry

Sleeping pills often contain barbital, which is weakly acidic (pKa = 8.00). For analysis of the barbital content of a sleeping pill, a titration is carried out with strong base. It takes 12.00 mL of 0.200 M base to reach the stoichiometric point. If the

asked by help on March 26, 2011
11. science

the teacher instructed three students A,B,and C respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). 'A' dissolved 50 g of NaOH in 100 ml of water B dissolved 50g of NaOH in 100g of water while C dissolved 50g of NaOH in

asked by irsha on September 6, 2011
12. science

the teacher instructed three students A,B,and C respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). 'A' dissolved 50 g of NaOH in 100 ml of water B dissolved 50g of NaOH in 100g of water while C dissolved 50g of NaOH in

asked by chemistry on September 6, 2011
13. Chemistry

Use activity coefficients to find the concentration of hydrogen ions in a solution of 75.0 mM butanoic acid and 0.01 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5. Take the size of C3H7COO– to be 500 pm. What is the concentration

asked by martini on October 11, 2013
14. Hudi

Sovereign each system by substitution.check your answer. 1/ y=x_2 y=4x+1 My answer: x_2=4x+1 2 2 x=4x+3 _4 _4 x= 1 y=x_2 y=_2 Solution:(1,_2) 2/ y=x_4 y=_x+2 My answer: x_4=_x+2 +4 +4 x=_x+6 +x +x x=7 y=x_4 y=7_4 y=3 Solution:(7,3) 3/ 2x+y=8 y=x_7 My

asked by Nan on September 16, 2018
15. Chemistry

A student weights 1.700 g of succinic acid and dissolves it in water in a 250.0 mL volumetric flask. A 25.00 mL sample of this solution is withdrawn and placed in a 125 mL Erlenmeyer flask, to which 5 drops of the acid-base indicator phenolphthalein is

asked by Mary on October 26, 2014
16. English Lit

I have a question about Henry II. What did he do that solidified his power as king but led to economic problems and helped incite conflict with the church. The possible answers are: Executed all Bishops who were opposed to his rule Gave enormous finiacial

asked by Emily on January 29, 2012
17. Chemistry

A chemist must prepare 500 ml of 9.00uM aqueous mercury(II) iodide working solution. He'll do this by pouring out some 81.0 umol/L aqueous mercury(II) iodide stock solution into a graduated cylinder and diluting it with distilled water. Calculate the

asked by Mia on December 20, 2018
18. Chemistry

You have 100 mL of a 0.450 M sulfuric acid solution, but you now need to add NaOH to make the solution basic. How much NaOH ( in grams) will you need to add to make the solution have a pH of 13.0? The units are grams of NaOH.

asked by Tessa Lehan on March 29, 2015
19. Biology

A cell is in an unknown solution. The cell contains 60% water, 10% salt, and 30% other materials. The solution contains 75% water, 5% salt, and 20% other materials. What type of solution is the cell in? isotonic neutral hypertonic hypotonic

asked by Chey on December 17, 2018
20. math

The scientists Verhulst (1828) and Peal (1930) proposed the following growth model for a population living in an environment with limited resources (e.g. space, food, sunlight, etc): = , where is the natural growth rate of the population when resources are

asked by josh on November 6, 2008
21. analytical chemistry

Adding 10.0 mL of 0.500 M HCl to 100.0 mL of pH = 7 water produces a solution with a pH of 1.34. What is the pH of the resulting solution when 10.0 mL of 0.500 M HCl is added to 100.0 mL of the buffer solution in the introductory example? That buffer

asked by simona on November 17, 2014
22. chemistry

8.058g x 10-2 kg of washing soda na2co3 10h20 is dissolved in water to obtain 1L of a solution of density 1077.2kg/m3. Calculate the molarity, molality and mole fraction of na2c03 in the solution? who helps

asked by Fai on January 1, 2013
23. Pre Cal

Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values of the trigonometric functions of t, whenever possible. (If there is no solution, enter NO SOLUTION.) 9pi/4 Looking for sin, cos, tan,cot, csc,

asked by Karmen on February 10, 2010
24. chemistry

Bill prepared 5.00-mL of borax solution at 59.2degrees C. He diluted the solution in an Erlenmeyer flask and titrated it to an endpoint with 27.05 mL of 0.500 M HCl. What is the saturation concentration of borate ions? I don't know what to do here. Does it

asked by jason on April 9, 2012
25. Chemistry

A potassium hydroxide solution has a pH of 12.90. Enough cid is added to react with half of the OH- ions present. What is the pH of the resulting solution? Assume that the products of the neutralization have no effect on pH and that the amount of

asked by Alexa on May 4, 2010
26. Chemistry

What is the maximum mass of cobalt (II) phosphate that will precipitate from a solution prepared by adding an excess of K3PO4 solution to 100.0 mL of 5.0 M CoCI2? Sorry for all the confusion with different names we are working in a group and its easier to

asked by Marissa on November 16, 2016

1) How many grams of CH4 (MM = 16.043) are needed to react with 50.0g of CL2 (MM=70.91)? 2) What is the molarity of a solution prepared by dissolving 20.0 g of methanol, CH3OH, oara sufficient water to prepare 500 mL of solution? Show calculations

asked by Maria on October 8, 2015
28. Calculus

Would someone please tell me how to solve these two problems? Find the indefinite integral: x(x-1)^5 dx (v^2)(1-v)^6 dv

asked by Richard on November 18, 2009
29. social study

what are the ways of solving enviromental problems in your communities?

asked by bala on March 27, 2014
30. Math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor 81a^6 - 3q^6

asked by Christy on July 21, 2010
31. Math help

I need help on these problems. There over solving equations by factoring. Don't get it at all. 1. (Y+5)(Y-7)=0 2. 2n(n-20)=0 3. (2t-3)(3t-2)=0 4. (2u+7)(3u-1)=0

asked by Anonymous on March 4, 2014
32. Math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor 64a - 49^3=

asked by Christy on July 21, 2010
33. English

What is overcoming problems an integral part of life?

asked by Bailey on August 31, 2010
34. Math

I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor by grouping: x^3 + 8x^2 -5x -40= I have (x^2 -5)(x + 8) ????

asked by Christy on July 21, 2010
35. math

Can't remember the way to solve for the variable. 5x + 6 = 7x. Answer is 3, but how to do other problems?

asked by Hannah on November 11, 2012
36. history

what problems did Nigeria encounter after oil was discovered there?

asked by dalton on May 6, 2010
37. Science gr 8

What are three problems that fluid technology helps solve?

asked by Hello on May 4, 2009
38. math

writing expressions in algebra story problems

asked by Anonymous on December 6, 2010
39. algebra

i need some examples of addition problems with negative answers can anybody help me ??????????????????

asked by cody on August 30, 2012
40. Algebra 1

What is 28% as a decimal and as a fraction? Also, can you tell me how you got the answer so I can solve the problems myself.

asked by Dani. on August 29, 2012
41. chemistry

acid rain --how does it cause environmental and health problems

asked by kathy on September 13, 2013
42. differential equation

dy/dx=x+y, y(0)=1 How do I solve for y(x)? I know the answer is y(x)=2e^x-x-1, but I forgot how to do these kinds of problems again.

asked by Anonymous on August 11, 2008
43. word scramble

asked by Lisa on June 13, 2014
44. Math

solve: 4x+18=22 please help. i just need to understand how to do this for i have many problems like this on my final, and i have forgotten how!

asked by EAW on January 13, 2008
45. algebra

please i need help factoring these problems....20xy, 36g^2h^2, and 44m^2n

asked by savannah on August 18, 2010
46. science

whats is an organized plan to solve problems

asked by maya on September 3, 2009
47. chemistry

asked by anonymous on November 30, 2011

ok ihave three problems for homework in algebra 1 honors Y+3=3+Y 6*1/2-Y=3*2 3/4+Y=0.75+Y

asked by brit on August 22, 2008
49. calc

If f(6) = 7, g(6) = 5, f '(6) = -2, and g'(6) = 8, find the following numbers. (a) (f + g)'(6) (b) (fg)'(6) How do you go about approaching these kinds of problems? Thanks

asked by mike on September 29, 2008
50. algebra

could someone please explain to me how -5/8 + 1/4 = -3/8? I have several more of these problems -5/8 + -1/6 = -19/24, and more. I have no reference in my text on how to do these. Can someone take me through the steps?

asked by aria on April 23, 2011
51. biology

Which of the following problems do immigration and emigration pose for demographers?

asked by christy on September 13, 2010
52. math - algebra 1

have 5 problems they are simplifying and write standard form #1 (5c-9)(5c+1)

asked by Bo on September 12, 2012
53. Algebra

were suppose to see if its a function or not and i don't get these problems can you explain it to me? 1) X=15 2) y=3x+2y

asked by James on October 1, 2008
54. Algebra2

problems 8 - 11: Give the slope and y-intercept of the given line. 1. 2x-3y=6 2. y=-2x 3. y=3

asked by amy on November 28, 2012

What problems are associated with the long-term containment of nuclear?

asked by Anonymous on February 4, 2013
56. Math!~Algebra

Issues with these 2 math problems and no examples in the book. S^8/S^5 -4x^3+9x^2-6x-1

asked by Sahara on May 26, 2008
57. Math

How have proportions been useful to solve various math problems that we have studied?

asked by Nabila Rahman on October 7, 2008
58. law/421

What types of problems was the UCC designed to address?

asked by at on September 20, 2012
59. history

What were a few big problems they saw with conquering foreign lands?

asked by jess on January 17, 2019
60. algebra

I need help with exploring and graphing functions can anyone please explain them to me? The problems look like this: {y=x+3} {y=-2x+3}

asked by Rayleigh on February 11, 2008
61. Pigskin Geography

What are the Interstates for pigskin week seven. They are like the last problems and I can't find them anywhere.!!

asked by LALA on October 24, 2009
62. College Algebra

can someone tell me how to get a division symbol when posting problems in Algebra

asked by Annie on November 28, 2010
63. Algebra1

P=2l+2w Solve for l. Please show me how you got your answer so I will understand how to do these problems. Thank you.

asked by Samantha on October 25, 2009
64. exam number 06041600

do you have the answers for this exam in steps to the math problems? i need help on them.

asked by lindaemory on December 5, 2012
65. DrBobb222!! Help!!

Please look at my Chemistry problems again, I reposted them with the constants and such. I am still confused!

asked by Jordan on September 11, 2012
66. Health

What has the society done concerning the current problems with teen pregnancy?

asked by Anonymous on February 17, 2015
67. math

5/2 has to be made into a mixed number but I'm having problems because i forgot how to do it please help me?

asked by Alicia on January 11, 2012
68. english

What are the most large ecological problems in the world todayÉ

asked by Rebecca on January 14, 2012

1. How do the graphs of y=1/x and y=5/(x+6) compare? I need steps because I want to be able to do these type of problems. Thank you!

asked by Olivia N J on February 16, 2017
70. IMPOSSIBLE ALGEBRA >:(

I have to do 10 algebra problems by tomorrow........and i don't know how..... :( 1. 7x-1 = 2x+5 2. 3y+1 = 4y-6 3. 10-y = 2y+3 4. 6x+2 = 1-x 5. 3a-10 = 4+a 6. 5y+4 = 4y+5 7. b+3 = 2b-7 8. 2x-1 = x-3 9. 2w+3 = 4w-5 10. 6n+4 = n-11 please help in any way you

asked by samma_chan on August 27, 2008
71. math

number sense- What two simpler problems can you use to find 9 x 38?

asked by mike on November 14, 2012
72. Math

Estimate the amount in each of the folloing problems. What is 48.3% of 1,500?

asked by Brenda on September 3, 2008
73. Math

Please simplify: Very confused, have many problems like this and need some guidence. Thanks! (root5a^7/2)^4 a^3/a^8

asked by Angie on June 25, 2009
74. Health

what negative physical problems is specifically associated with how heroin is taken?

asked by Betty on December 16, 2010
75. public finance

What are the problems of budget implementation and process in Nigerian

asked by yahaya on February 11, 2016
76. critical thinking

How are the problems in crime, housing and health interrelated?

asked by dora on April 9, 2015
77. social studies

Of the problems experienced by the Confederation Congress, which do you think was the most harmful? why?

asked by Michaela on November 8, 2009
78. Math

For all real numbers, f(x)=(x^2+1)/2. If f(a)=25 and f(11)=b, what could be the value of b-a? I'm confused on how you do these problems. Can someone show me how to do them? Thanks much!

asked by Monique on May 11, 2008
79. math

I've done these problems for the past 4hrs and i can't get them right please its my only questions left.1-12 1.x + 3 > 5 2.7 > x + 5 3.x - 8 ≤ -6 4.-4 < -6 + x 5.9x > 18 6.-3x > 6 7.x/4>0.5 8.x/-14>1/7 9.-10 ≥ 5x 10.-16 ≥ -8x 11.-4x < 8 12.15 ≥

asked by plshelp on September 19, 2016
80. Civic

What are the major local/world civic problems

asked by Excel on February 27, 2019
81. algebra homework

asked by kenneth on September 8, 2010
82. 7/8 Math

what is the value of x in: -x/3 + 4 = 20 Could you guys please tell me how to do it and include the answer. I have other problems like this where x is negative so I just need to know how to do it :) Thanks!

asked by Christabelle on September 30, 2012
83. accounting 250

help with problems that might occur when balance statement is incorrect

asked by Axia on October 14, 2008
84. math

Find f'(a) for f(x)=4x3+1x f'(a) =? please please help. i just need to figure out how to do it once and then i can do the rest of my problems

asked by kayla on February 19, 2010
85. Social Studies

What are some problems that may come when the National Dream Act is passed.

asked by Lilly on November 4, 2014
86. Environmental science

Do you know of any environmental problems in Del Rio, texas

asked by Mike on January 8, 2010
87. Pre-Calculus

can someone help me with figuring out my math and explaining it to me. or How to use the calculator with the problems ?

asked by Ty on June 9, 2013
88. algebra

can you please help me with this so that i can do my other problems simplify and show alll work -4x^2-3x-(x-x^2+3)

asked by babygirl on October 2, 2011
89. geometry

How are proportions solved when brought out in word problems?

asked by brooke on November 18, 2008
90. Math Fractions

How do you solve this and problems like it: 3/4 of _____ is 90 5/6 of 120 is ______

asked by Rosie on March 19, 2009

This is fractions. Not dividing problems. (Ex: 3/5 is a fraction) 5c = 2/3 (divided by) 2/3

asked by David on April 21, 2010
92. math

I need help with 4 mat problems. I do not know how to set up to solve. x/8=-6 -4/9+(-5/7) x-4/5=6/7 7/x=?/xsquared

asked by will on April 11, 2008
93. Algebra 1

How do I find a, b, c, and d, for cubic equations in word problems.

asked by Jojo on May 17, 2018
94. math

how doo i do my my math homeeework:congruence problems.

asked by ashley on February 24, 2011
95. algebra

how do you convert these 2 problems to slope intercept form? -2x=-1y-6 3x+3y=-18

asked by caroline on March 23, 2010

I need help in creating 3 Math problems that has to do with Baseball. Does anyone know how to or websites to help me...

asked by Lauren on January 25, 2010
97. Solving linear equations

Is there a formula to following or pattern. This is very new to me and I am having issues with these type of problems, please help

asked by heybaby on February 8, 2013
98. phil 103

Logic can help analyze ethical problems. (Points : 1)

asked by mary on June 17, 2013
99. science

Do clown fish encounter problems in its habitat?

asked by Juan on March 22, 2009
100. Heron's formula

some Problems based on heron's formula at home

asked by Anonymous on July 1, 2014