# 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 114
1. ## CHEM

How do I work the following question? I found the amu of CaCO3=101.0872g/mol; 2HCL=72.92128g/mol; H2O=18.1582g/mol;CO2=44.0098g/mol; and, CaCl2=110.9834g/mol. You carefully weigh out 10.00g of powder and add it to 40.50g of solution. You notice bubbles as

asked by d on October 1, 2007

Solve the equation by expressing each side as a power of the same base and then equating exponents. 9^(x - 9)/8= sqrt of 9 i got 13 4^(x + 10) = 8^(x - 6) i got 38 Solve the exponential equation. Express the solution set in terms of natural logarithms.

asked by Ang on October 26, 2007
3. ## chemistry

What is the solubility of AgCl when it is in a solution of 0.15 M NaCl? (AgCl has Ksp = 1.8 x 10-10.) Make a reaction table. Include rows for initial concentration, change in concentration, and equilibrium concentration. Write down the equation for the Ksp

asked by Anonymous on May 4, 2012
4. ## AP Chem

A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 458-mg sample of the barium compound if a solution of the sample

asked by Anna on November 3, 2008
5. ## chemistry

What is the solubility of AgCl when it is in a solution of 0.15 M NaCl? (AgCl has Ksp = 1.8 x 10-10.) Make a reaction table. Include rows for initial concentration, change in concentration, and equilibrium concentration. Write down the equation for the Ksp

asked by Anonymous on April 23, 2012
6. ## Probability and Statistics

For question 1, here's the numbers you use: {20, 18, 17, 19, 22, 29, 16, 27, 24}. 1. Calculate the 50th percentile. For questions 2 and 3 use this number line: {16, 17, 18, 19, 20, 22, 24, 27, 29, 80} 2. Calculate the z-score for the 80 & explain what it

asked by Amber on January 4, 2013
7. ## physics

Again, I know I keep posting questions but I'm begging you for help. At 25°C the vapour pressure of pure pentane is 511 torr and that of hexane is 150. torr. What is the mole fraction of pentane in a pentane-hexane solution that has a vapour pressure of

asked by anonymous on April 11, 2012
8. ## Social Studies

Well- this is kind of social studies...so anyway, I have to do a presentation on automobiles and I wanted to know some problems with automobiles in the 1920's? I already have: The automobiles scared horses because they were so noisy, people drove there

asked by Anonymous on November 19, 2015
9. ## Science

If I want to make a solution that has a 5% concentration of salt, is it correct for me to have 380mL water and 20g salt? My method behind this was that I wanted a 400g solution, and so since 1mL water is equal to 1g water, I did: 400x0.95=380g water or

asked by Anonymous on February 6, 2011
10. ## I would like to understand my calc homework:/

Consider the differential equation given by dy/dx=(xy)/(2) A) sketch a slope field (I already did this) B) let f be the function that satisfies the given fifferential equation for the tangent line to the curve y=f(x) through the point (1,1). Then use your

asked by Amber on March 27, 2013
11. ## Chemistry

A 1.00 g sample of enriched water, a mixture of H2O and D2O, reacted completely with Cl2 to give a mixture of HCl and DCl. The HCl and DCl were then dissolved in pure H2O to make a 1.00 L solution. A 25.00 mL sample of the 1.00 L solution was reacted with

12. ## CHEMISTRY

a concentration-time study of the gas phase reaction a 2A3 -> 3A2 produced the data in the table below. time [A3] (M) [A2] (M) 0 4.00 *10^-4 0 10 2.00 *10^-4 3.00 *10^-4 20 1.00 *10^-4 4.50 *10^-4 10 5.00 *10^-5 ? A) What is the concentration of A2 in the

asked by chantel on September 4, 2014
13. ## Biochem

What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? Condition: A cell-free yeast extract is placed in a solution that contains 3.50 × 102 mmol glucose, 0.30 mmol ADP, 0.30 mmol Pi,

asked by Mark on April 3, 2013
14. ## geometry

I would love for someone to check my work on the seven problems that I did. I would be eternally grateful. I am going to list my problems and answers. Even if you only want to check one of them, that would be great. 1. Write an equation of a line in point

asked by Savannah on August 2, 2015
15. ## United states history

What similarities do you see between the United States today and the United States of the past? What issues and problems do we continue to grapple with? What successes do we share with Americans in the past? I want to find something now in united states

asked by Selena on December 8, 2014
16. ## health

In the field of health care administration, why is it important that everyone within the facility use medical terminology correctly? How can using correct medical terminology improve patient outcomes and services within the facility? What could be some

asked by Taylor mcBride on April 17, 2012
17. ## AP Chemistry

A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH a. Does the solution contain a strong acid with a strong base, a strong acid with a weak base, a weak acid with a strong base, or a weak acid with a weak

asked by jesse on March 23, 2016
18. ## chemistry

A solution is made by adding 0.100 mole of ethyl ether to 0.841 mole of ethyl alcohol. If the vapor pressure of ethyl ether and ethyl alcohol at 20oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20oC (assuming ideal

asked by renee on February 22, 2012
19. ## chemistry

A solution is made by adding 0.100 mole of ethyl ether to 0.841 mole of ethyl alcohol. If the vapor pressure of ethyl ether and ethyl alcohol at 20oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20oC (assuming ideal

asked by renee on February 22, 2012
20. ## Chemistry

A titration involves titrating 0.4 M NaOH into a solution of 0.2 M H3PO4. a.) Calculate the volume of NaOH that will be required to reach the first equivalence point. b.) Calculate the volume of NaOH required to reach the second equivalence point. Other

asked by Anonymous on February 8, 2014
21. ## AP Chemistry

A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH a. Does the solution contain a strong acid with a strong base, a strong acid with a weak base, a weak acid with a strong base, or a weak acid with a weak

asked by Anonymous on March 23, 2016
22. ## Analytical Chemistry

A 22.617 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 70.407 g of water. A 10.883 g aliquot of this solution is then titrated with 0.1072 M HCl. It required 29.32 mL of the HCl solution to reach

asked by Sam on February 28, 2013
23. ## Chemistry

A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be M. What permits this assumption? A. The

asked by Neil on June 20, 2011
24. ## Chemsitry

Check my work? What is the approximate pH of a 0.05 M solution of HSCN that has a Ka of 10-4? HSCN -> H+ + SCN- --------------------------- The equation for calculating pH is pH = -log [H+] Now we need to find H+ and solve. [HSCN] = 0.05 M the molarity Ka

asked by Aurora on May 13, 2016
25. ## math

What does it mean to have two matrix variables written vertically inside parentheses? In other words, if A and B are matrices, what does this mean (imagine there is one set of parentheses spanning both rows): (A) (B) I'm trying to understand a least

asked by sergei on January 7, 2009

Having problems with surface area of a triangular prism. I know the formula is ab + (S1 + S2 + S2)h, however I can't tell what all 3 sides of the trianle are from the picture. The triangular face shows a height of 50 in and a base of 20 in. No other

asked by Brandi on November 29, 2012
27. ## ancient mariner

Do you think the ancient mariner is a romantic poem? I am having problems trying to figure out why it isnt'. thanks This site will give you the era and definition of poetry from the Romantic era. After reading it, you will be able to see where The Rime of

asked by casey on February 28, 2007
28. ## Pre-calculus

I am having difficulty with two problems: 1) Evaluate (1+i)^12 by using DeMoivre's Theorem. Express the result in rectangular form. So far I have: r=sqrt(1)^2+(1)^2 which simplified is sqrt2. Don't know how to proceed. 2) Write the polar equation theta =

asked by Lucy on September 30, 2008
29. ## math 098

I made 3 f's on my tests in math 098, do you think i need to withdraw and take math 090 instead. this is my first semester and i really want to do my best please help. math 098 is algebra math 090 is basic for college. the score were equations--52,distance

asked by %%%Rena%%% on July 6, 2012

Hi, I am having problems with the structures of sentences in sign language. Can you please put each of these sentences in sign language sentence structure? What will the weather be like today? The sun will be out, and it will be windy. I thought it was

asked by LeXi<3 on April 4, 2012
31. ## Physics

Calculate the formula for coefficient of kinetic friction in an inclined plane with a pulley and two masses coonected by a rope. You can only use the weight of the two masses, the height where the second object is and the distance that the first object

asked by Nelson on June 29, 2016
32. ## Sign Language

Hi, I am having problems with the structures of sentences in sign language. Can you please put each of these sentences in sign language sentence structure? What will the weather be like today? The sun will be out, and it will be windy. I thought it was

asked by LeXi<3 on April 4, 2012
33. ## Chemistry

Xenon of mass 5.08 g reacts with fluorine to form 9.49 g of a xenon fluoride. What is the empirical formula of this compound? A) XeF6 B) XeF4 C) XeF2 D) XeF E) Xe2F I am not familiar with these types of empirical formula problems. If I'm given the

asked by Olivia on March 23, 2009
34. ## Chemistry

Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 degrees celcius ? The freezing point for pure water is 0.0 degrees celcius and Kf is equal to 1.86 degrees

asked by Nikita on January 16, 2011
35. ## Algebra

I have a few problems I need some help with. The first is Evaluate the sum. 1. There is an E like symbol on the top is 10 on the bottom n=1 and to the right (7-2n) 2. The next question is find a10 for an arithmetic sequence with a1=6 and d=10 3. Find the

asked by Jess on April 3, 2013
36. ## Math

Alyssa is doing a card trick with one of her friends, Denise. She only uses 15 cards: 3 diamonds, 3 hearts, 4 spades, and 5 clubs. Denise draws one card, replaces it in the deck, and draws one card again. What is the probability that she draws a heart both

asked by Sanzi on February 19, 2014
37. ## Math

I have 2 problems that I just need to know if they are right 1. Add, Simplify if possible 3/14w + 11/49w Answer that I got was 21+22/98w 2. Add, simplify if possible 9b/3b-9 + 6b/9b-27 I am not sure about this one I got two answers 81b+6b/34b-108 or

asked by Anonymous on October 18, 2009

My daughter must correct the problems that she has gotten wrong in math, and we are trying to help her. I can not remeber how to write decimals in exponential form, and I tried looking in her book. Can some one help me so that I can help my daughter.

asked by Alicia on October 15, 2008
39. ## help with my science test 7th grade connection

11. Several studies link cigarette smoke to health problems have resulted in the banning of smoking in many public places.this is an example of A.ways scientific theories become scientific laws. B.ways a scientists communicate results C.ways science

asked by Angle on September 15, 2017
40. ## MATH!!

(1)At the begining of her math class, Mrs. Reno gives a warm-up problem. She says, "I am thinking of a number such that 6 is less than the product of 7 and this number is 85." Which number is she thinking of? A-11 B-84 C-13 D-637

asked by megan on March 11, 2007
41. ## Statistics

Can someone please help me with this example, I do not understand it at all. Binomial problems: Advanced A machine that manufactures automobile parts is estimated to produce defective parts % of the time. If this estimate is correct, and parts produced by

asked by Christi on May 26, 2010
42. ## Chemistry

A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac

asked by Mike on November 14, 2011
43. ## chemistry

A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac

asked by Mike on November 14, 2011

i have a problem with this question my teacher gave me. i don't know what to write for the answer. the problem: there is a girl named Jane who is hired as the head of the payroll department at R& S Electronic company, firm of 75 employees. she is hired by

asked by jack smith on August 22, 2011
45. ## Chemistry Equation

In a lab expirement you add copper(II)nitrate to pure zinc. Write a balanced equation for this expirement and predict if a reaction will occur. I THINK Bob Pursley answered this question a day or so ago. Zinc is higher in the activity series than copper;

asked by chrissy on January 6, 2007
46. ## chemistry

A 1.00-g sample of piperazine hexahydrate is dissolved in enough water to produce 100.0 mL of solution and is titrated with 0.500 M HCl. What is the initial of the solution, before any titrant is added? Piperazine,HN(C4H8)NH, is a diprotic weak base used

asked by shae on March 30, 2011
47. ## Chemistry

Calculate the enthalpy change (ΔH) for: HCl(aq) + NH3(aq) → NH4Cl(aq) The reaction of 50.0 mL of 1.00 M HCl with 50.0 mL of 1.00 M NH3 causes a temperature rise of 6.4 ˚C in the resulting 100.0 mL of solution. The NH4Cl solution has a density of 1.005

asked by Jim on September 15, 2015
48. ## Chemistry

Oxalic acid, found in the leaves of rhubarb and other plants, is a diprotic acid. H2C2O4 + H2O ↔ H3O+ + HC2O4- Ka1= ? HC2O4- + H2O ↔ H3O+ + C2O42- Ka2 = ? An aqueous solution that is 1.05 M H2C2O4 has pH = 0.67. The free oxalate ion concentration in

asked by Ashley on November 15, 2016
49. ## chemistry

A student needs to make a dilution from a stock solution. The stock solution is 2.) M NaCl. How much should the student use of the 2.0 M NaCl to make 1.0 L of 0.05M NaCl diluted stock.

asked by Marilyn on April 6, 2011
50. ## World History

Which of the following was the major reason Philip II and Louis XIV patronizing the arts? a. They desired to show their great power through the splendor of their royal courts.*** b. They sought to distract their subjects from continuing economic problems.

asked by Olivia N J on February 1, 2017
51. ## English

I left out the following statements. Thank you. 1) Investigation activities will be based on four components: investigation (analyzing problems from different points of view), interaction (activities and skills) and interpretation (presentation of findings

asked by Henry2 on January 28, 2012
52. ## Social studies NEED HELP

which of the following were problems faced by the english colonist at jamestown? The colony employed many indentured servants and paying them was different •• They Settled in an insecure location and were vulnerable to Spanish attack The location of

asked by Cassidy Ziegler on September 23, 2016
53. ## AP Chemistry

Hey guys! Stuck on some problems: 1)Consider the following chemical reaction between gases: 2N2O(g) + O2(g)->4NO(g) + heat The amount of O2 at equilibrium will be decreased by: 1. Adding more NO(g). 2. Increasing the pressure by decreasing the volume. 3.

asked by Allie on October 8, 2015
54. ## Pre.Calc

You want to make an investment in a continuously compounding account over a period of ten years. What interest rate is required for your investment to double in that time period? Round the logarithm value to the nearest hundredth and the answer to the

asked by Julissa on March 14, 2015
55. ## English

I've had problems in the past with MLA format as far as writing and I was wondering what was wrong with this work cited entry... Kenyone, Jane. "Let Evening Come." Collected Poems. St. Paul, Minnesota: Graywolf Press. 1990. The Collected Poems is

asked by Vesone on April 17, 2007

i have two problems that i need to write an inequality for. a) One third of a number, decreased by thirty six, is at most twenty two. Find the number. b) A school's Spanish club is welling bumper stickers. They bought 100 for \$55, and have to give 15 cents

asked by saranghae12 on February 28, 2012
57. ## Biology

I am doing a lab on Dialysis to check if starch moves through the differentially permeable membrane of dialysis tubing.We did this by placing a dialysis tube filled with starch solution into a beaker filled with distilled water and a few drops of iodine. I

asked by Audrina on February 18, 2009
58. ## chemistry

Malic acid is a weak diprotic organic acid with K1 = 4.0x 10-4 and K2 = 9.0 x 10-6. (a) Letting the symbol H2A represent malic acid, write the chemical equations that represent K1 and K2 . Write the chemical equation that represents K] xK2 . (b)

asked by pinky on December 15, 2014
59. ## Chemistry

A sample of CuSO4*5H2O was heated to 110 degrees C, where it lost water and gave another hydrate of copper (II) ion that contains 32.50% Cu. A 98.77-mg sample of this new hydrate gave 116.66 mg or barium sulfate precipitate when treated with barium nitrate

60. ## Chemistry

What is the mole fraction of methyl n-butyrate CH3(Ch2)2COOCH3 in the vapor phase of a solution consisting of? a mixture of methyl n-butyrate and ethyl acetate CH3COOCH2CH3 at 50 Celsius if the total pressure above the solution is 192.5 torr. The vapor

asked by Jude on February 20, 2011
61. ## chemisrty

i don't get how to do molar conversions? I hope this helps. 1.) Go to google. 2.) Type in molar conversions 3.) Click on the first link. This link has examples and the answers to the practice problems. To get better at these. Remember to keep practicing.

asked by gabby on January 4, 2007
62. ## CHEMISTRY> HELP QUICK! pls

what is the pH of a 2.62x10^-1 M NaNO2 solution? NB the pKa for HCN=9.212 12.13 13.42 1.87 8.29 0.58 and also; what is the pH of a 2.62x10^-1 M HCN solution. NB the pKa forn HCN is 9.212. 4.90 9.21 0.58 11.32 13.42

asked by Lucinda on June 1, 2010
63. ## college chemistry

A) In some regions of the southwest United States, the water is very hard. For example, in Las Cruces, New Mexico, the tap water contains about 560 ug of dissolved solids per milliliter. Reverse osmosis units are marketed in this area of soften water. A

asked by Stephanie on April 28, 2010
64. ## chem. stuff+5

9. The reaction 2 H2O(l)>>>O2(g) + 2 H2(g) requires 2.06 V, but the reaction 2 H2O(l) + 2 Cl –(aq)>>> H2(g) + 2 OH –(aq) + Cl2(g) requires 2.19 V. If a 1.0 mol/L solution of aqueous NaCl is electrolyzed, what voltage should be applied to get O2(g), but

asked by hey u!! on June 17, 2006
65. ## World History

Which of the following best explains how the alliance system contributed to the outbreak of World War I? A. Alliances had limited trade, causing economic problems and spurring unrest. B. Rival alliances had promoted tension rather than security. C.

asked by June on March 15, 2017
66. ## Biology

1)Which of the following is NOT a true property of water? A-Water is a good solvent dissolving a wide variety of substances. B-Water has a high ice density allowing ice to sink when present with liquid water. C-Water has strong cohesion allowing it to bead

asked by HELP ME on January 28, 2019
67. ## Chemistry

I am about to do an extraction experiment, and needed help with a question to improve my understanding. Any help appreciated. 1. You have 150 ml of a solution of benzoic acid in water estimated to contain about 5g of the acid. The distribution coeffcient

asked by Natasha on March 12, 2010
68. ## life orientation

Describe a recent service delivery protest in your community or in the neighbourhood .what are the problems that did the community members do before the protest ? What did the community members do before the protest was conducted by the ccommunity and what

asked by nkule on May 19, 2019
69. ## alg 1

Quadratic graphs and their properties: Identify the domain and range of each function: y = 4x^2 - 3 I have no idea how to find the range and domain. Would you please explain in detail how I can determine the domain and range in the quadratic problems?

asked by Jane on April 4, 2013
70. ## Civics

Under the Articles of Confederation, there was no separate judicial branch. Which of the following problems did this create? A. Judges could not make any rulings on cases involving the state. B. People had nowhere to go if they had a dispute with the

asked by The dancing potato on September 28, 2018
71. ## Calculus (pleas help!)

Consider the function f(x)=12x^5+60x^4−100x^3+4. For this function there are four important intervals: (−INF,A], [A,B] ,[B,C] , and [C,INF) where A, B, and C are the critical numbers. Find A, B, and C. At each critical number A, B, and C does f(x) have

asked by Karku on March 31, 2011
72. ## science

Standing on a scale on an elevator is a man of mass 140kg. a) what is the reading of the scale if the elevator moves up at 5 m/s. b) moves down at 5m/s c) accelerated up at 2m/s^2 d) accelerates down at 2m/s^2? for a) and b) would I use N=m(g+a) but when I

asked by Jenny on November 20, 2006
73. ## physics

Im trying to study for my physics exam by doing some extra problems, however im stuck with this one. any help is much appreciated Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 4.62 x 10-6 kg. The

asked by John on September 28, 2012
74. ## Social studies

Which of the following do the conflicts in both Darfur and Rwanda illustrate? A. The environmental issues many African nations are experiencing. B. The problems some African nations are facing as a result of colonialism. C. The economic prosperity certain

asked by Lyn on March 13, 2019
75. ## math

Let f(t) = Q0at = Q0(1 + r)t. f(7) = 75.94 and f(9) = 91.89 (a) Find the base, a. (Round your answer to two decimal place.) a = I honestly have no idea how to approach these problems. I wrote out the different equations: 75.94 = Q0a^7 and 91.89 = Q0a^9 but

asked by Stella on August 30, 2015
76. ## Physics

Oxygen (O2) has a molar mass of 32.0 g/mol [.032kg/mol]. What is the root-mean-square speed of an oxygen molecule at a temperature of 310 K? Vrms=492 m/s What is its average translational kinetic energy at that speed? Kav= ?? J I am having problems with

asked by Christina on December 9, 2007
77. ## chemistry

The pH of a solution prepared by mixing 45 mL of 0.183 M KOH and 65 mL of 0.145 M HCl is i solved it but my answer is wrong. the right one is 1.97. am i missing a step? moles of HCl left over = (moles of HCl) – ( moles of KOH) moles of HCl left over =

asked by ben on November 23, 2010
78. ## Problem Solving Math Question

Find the sum of all the numbers in the following array: 1 2 3 4 5 6........100 2 4 6 8 10 12 ......200 3 6 9 12 15 18 ......300 . . . 100 200 300 400 500 600 . . . 100(x)100 Can anyone help me?? I'll suggest how to solve this, but you'll need to do the

asked by Krisy on August 27, 2006
79. ## Chemistry

Q1: You wish to prepare a buffer solution with pH = 11.10. What volume of 6.0 M HCl would you add to 500 mL of 0.10 M (C2H5)2NH to prepare the buffer? You may assume that the solution’s volume remains constant. Q2: What is the resulting pH when 20 mL of

asked by David on February 24, 2013
80. ## Chemistry

Q1: You wish to prepare a buffer solution with pH = 11.10. What volume of 6.0 M HCl would you add to 500 mL of 0.10 M (C2H5)2NH to prepare the buffer? You may assume that the solution’s volume remains constant. Q2: What is the resulting pH when 20 mL of

asked by Anonymous on February 24, 2013
81. ## Chemistry

Express the following in mol/kg [H+]in a water with a pH of 6.8? Ok, so the pH=-log10[H+]. Here we have a pH of 6.8 so we have... 6.8=-10log10[H+] solving we get... [H+]=10^-6.8 mol/L converting from Liters to m^3 and dividing by the density of water we

asked by Jan on January 20, 2007
82. ## chemistry

(b) (i)The e.m.f. of the cell was measured as 0.62 volts. Taking the standard electrode potential of Cu/Cu2+ as = +0.34 volts, calculate the standard potential of the Co/Co2+ system. Be careful to indicate whether your answer is positive or negative. (ii)

asked by bby on April 10, 2017
83. ## Chemistry

Consider the following reaction: PbCl2 + 2 NaOH -> Pb(OH)2 + 2 NaCl What would be the major species observed floating in solution after one mole of PbCl2 and 2 moles of NaOH are mixed in aqueous solution? 1. Na+ ions, Cl− ions and H+ ions 2. Pb2+ ions,

asked by Cher on April 5, 2010
84. ## AP Chemistry

Consider the following reaction: PbCl2 + 2 NaOH → Pb(OH)2 + 2 NaCl What would be the major species observed floating in solution after one mole of PbCl2 and 2 moles of NaOH are mixed in aqueous solution? 1. Na+ ions, Cl− ions and H+ ions 2. Pb2+ ions,

asked by Sam on April 18, 2016
85. ## Com/220

Hello I am stuck on trying to figure out my assignment on Incorporating Statistics, Graphs, and Illustrations. My topic I chose was on Education and I am not having any luck finding any pictures, graph's or anything on this topic that I can use. Is there

asked by Nikki on June 3, 2010

Pure lauric acid is melted and the freezing point is determined to be 43 degrees celsius. A solution is made by dissolving .50 grams of paradicholrobenzene into 3.00 grams of lauric acid. Determine the molality of this solution. I got 1.1m. which is right.

asked by Miley on April 16, 2008
87. ## Chemistry

Suppose a student used 28.4 ml of 0.100 M NaOH solution to neutralize the 25.0 ml of the lemon juice sample which contains citric acid (H3A)in it. H3A + 3NaOH -----> Na3A + 3H2O Molar mass of citric acid = 192.2 g/mole a)What is the molarity(M)of citric

asked by Nam Le on December 14, 2014
88. ## math induction

prove the product of 4 consecutive integers is always divisible by 24 using the principles of math induction. Could anyone help me on this one? Thanks in advance! Sure For induction we want to prove some statement P for all the integers. We need: P(1) to

asked by zomg on September 14, 2006
89. ## Internatinal Relations

Five of the most serious international problems facing the world today are: 1) the proliferation of WMD 2) international terrorism 3) economic development in impoverished countries 4) international financial stability 5) climate change In which of these

asked by Jun on March 9, 2010
90. ## trig

I'm confused with this concept: Okay, so I have this problem: cos2x( 2 cos+1)= 0 I understand I have to work the problems separately and I get cos x= 2 and cos x= 1/2 Now, what I don't understand is how this connects to pi, radians or the unit circle. If

asked by Anonymous on October 29, 2011
91. ## science

Different reference identify at least seven different problems with the following reference and the re-write the reference in its proper form Jo-Anne James; John Welles. (Nov.2009). The effects of Sleep Deprivation on Driver Errors, journal of applied

asked by eid2013 on November 3, 2013
92. ## college chemistry

A solution is made by adding 0.100 mole of ethyl ether to 0.841 mole of ethyl alcohol. If the vapor pressure of ethyl ether and ethyl alcohol at 20oC are 375 torr and 20.0 torr, respectively, the vapor pressure of the solution at 20oC (assuming ideal

asked by renee on February 26, 2012
93. ## math

1.solve for p 3(p+q)=p A.q=-2/3p B.q=-3/2p C.p=-2/3q D.p=-3/2q 2. solve for b then find the value of b when a=3 4a=2b-7 A.-9/2 B.5/2 C.19/2 D.17 3. solve for r d=rt A.r=dt B.r=t/d C.d/t D.r=d-t 4. find the width of a rectangle with a perimeter of 90 and a

asked by oto on September 15, 2016
94. ## Honors Pre-Calculus

The prompt says "Graph each function. Determine the interval[s] for which the function is increasing and the interval[s] for which the function is decreasing." The problems that are given in this prompt are: 1. y= x^3+3x^2-9x 2. f(x)=1/(x+1)-4 3.

asked by Jessica Miller on September 4, 2012
95. ## Science

1) If you let all of the liquid evaporate out of the pitcher, would you be able to see the solid particles of the drink mix? Explain. 2)Compare what happens when a geyser erupts to what happens when a tea kettle whistles. 3)Name something made of aluminum

asked by Stepfanie on February 8, 2017
96. ## algebra

1.)correct 2.)wrong---> the first term is wrong 4(3a^2)^2 = 36a^4 3.) not sure on this one 4.) wrong---> - square root of six is not a solution Hope this Helps! 1)find p(-3)if p(x)=4x^3-5x^2+7x-10 =-184 2)If r(x)=4x^2-3x+7,find r(3a^2) =12a^4-9a^2+7

asked by manny on August 16, 2007
97. ## critical thinking

what are the fallacies in 5. Letter to the editor: “I strongly object to the proposed sale of alcoholic beverages at County Golf Course. The idea of allowing people to drink wherever and whenever they please is positively disgraceful and can only lead to

asked by suzie on March 15, 2010
98. ## Management

The administrator of the Life-Time Insurance Com¬pany HMO, Ms. Taylor, was anxious to solve poten-tial problems before their new clinic opened in Austin, Texas. In Buffalo, New York, where the original clinic is located, the pharmacy had been extremely

asked by Shrestha on April 29, 2013
99. ## math

What properties are these problems? 1. 17 + ___ = 33 + 17 2. (10 + 4) + 21 = (___ + 21) 3. 14 × 25 = 25 × ____ 4. 8(4 × 2) = (8 × 4)____

asked by Alex on September 27, 2008
100. ## fractions

i want to email you. please send email so i can send my math problems to you.

asked by Daniel on July 19, 2009