# What happened if you put the Elodea leaf cells in a solution of 0.5% NaCl,1.8% NaCl and 0.9%NaCl?

36,754 questions, page 317
1. ## Physics

Can you please explain further because I don't understand? Two parallel slits are illuminated by light composed of two wavelengths, one of which is 645 nm. On a viewing screen, the light whose wavelength is known produces its fifth dark fringe at the same

asked by Mary on November 14, 2007
2. ## PreCalc

1) Determine the value of r (put this number in the first blank) and then determine the value of the 10th term of the geometric sequence. Do not use any decimals or mixed numbers in your answers. Reduce all fractions to lowest terms. a1 = 2 and a4 = −1/4

asked by Anonymous on July 16, 2012
3. ## psych and amnesia

I need a way to present info on amnesia that is funny, and that will really interest my pears and my teacher. Any ideas? Your "pears"? I am not certain there is much humor in this condition, I would avoid making fun of the condition. It is devastating to

asked by jax on October 21, 2006
4. ## Western Civilization 102

Can someone please interpret Charles Darwin thought and statements for me please: He believed that "As more individuals are produced than can possibly survive, there must in every case be a struggle for existence, either one individual with another of the

asked by Willy Wonka on April 11, 2011
5. ## English

Thank you very much for your corrections. Here are some more sentences I'm not sure of. 1)Independence Day commemorates the signing of the Declaration of Independence by the Continental Congress on 4th of July, 1776. 2)What were the causes which led to the

asked by Franco on October 13, 2010
6. ## physics

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by

asked by Justin on July 28, 2013
7. ## physics

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by

asked by Justin on July 25, 2013
8. ## physics

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by

asked by Justin on July 28, 2013
9. ## physics

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by

asked by Justin on July 26, 2013
10. ## Chemistry

Automobile batteries contain sulfuric acid, which is commonly referred to as "battery acid." Calculate the number of grams of sulfuric acid in 0.650 L of battery acid if the solution has a density of 1.28 g/mL and is 38.1% sulfuric acid by mass.

asked by Anonymous on August 18, 2013
11. ## college algebra

Suppose that the number of new homes built, H, in a city over a period of time, t, is graphed on a rectangular coordinate system where time is on the horizontal axis. Suppose that the number of homes built can be modeled by an exponential function, H= p *

asked by hilda on April 21, 2010
12. ## Chemistry

Sodium chloride dissolves in water (solubility in water is 361g/1L), but copper (II) phosphate does not dissolve in water (insoluble). A. Describe in a stepwise fashion how the solid sodium chloride dissolves in the water to form a solution. (name the

asked by Anonymous on December 8, 2015
13. ## chemisty

115 grams of KCl is dissolved in 750 ml of water. what are the molality, molarity, mole percent, % mass, ppm by mass. what would the freezing point and boiling point of that solution assuming Kf of water is 1.86 degree celsius/m and Kb is .0512 degree

asked by shaknocka on February 7, 2011
14. ## acid and base titrations

25.00 mL of a solution of HCL was titrated with 0.4500 M NaOH using the indicator bromthymol blue. Successice readings of the burette gave the following data: colour: Volume of NaOH (mL)= i.) 16.35 yellow ii.) 16.40 yellow iii.) 16.45 green iv.) 16.50 blue

asked by jj reddick on November 21, 2010
15. ## Chemistry Lab

What would happen to the reaction rate of a solution if 10 mL or more of water is added? Will the reaction rate increase or decrease? The following reaction occurs without a change in the color 2A (g) + B2(g) --- 2AB (g) a) How could you monitor the

asked by Sunshine on July 20, 2009
16. ## chemistry

When 18 g of ethylene glycol C2H6O2 is dissolved in 150 g of pure water, the freezing point of the solution is _C . (The freezing point depression constant for water is 1.86C kg) what i tried was 18/62 to find the moles. then i got .29/.150 to solve for

asked by david on April 7, 2008
17. ## Chemistry

I did a lab in which I added ionic solutions to tap and distilled water and another ionic solution. Distilled water is the control because it does not react to any solutions since it doesn't contain ions. But one of the lab questions I need to answer is:

asked by Fred on November 16, 2008
18. ## Chemistry

What is the vapor pressure in Torr above a solution prepared by mixing 66.73g of benzene C6H6 with 63.26g toluene C6H5CH3 at 20 Celsius. The vapor pressure of pure benzene and toluene at 20celsius are 75 and 22 torr respectively. These compounds form

asked by Jude on April 23, 2011
19. ## Chemistry Lab

What would happen to the reaction rate of a solution if 10 mL or more of water is added? Will the reaction rate increase or decrease? The following reaction occurs without a change in the color 2A (g) + B2(g) --- 2AB (g) a) How could you monitor the

asked by Sunshine on July 20, 2009
20. ## Chemistry

What is the balanced net ionic equation for the reaction between the permanganate ion and the ferrous ion in acid solution. What is the number of moles of ferrous ion that could be oxidized by 1.2×10^-2 moles of permanganate ion? Honestly don't understand

asked by Minset on October 4, 2015
21. ## MATH

Useing substitution/elimination method what is the solution set to 2x+y=1 x^2=y+2 a)(-3,7) and (1,-1) b)(3,7) and (-1,-1) c)(-3,-7) and (1,1) d)(3,-7) and (-1,1) I've really no educated guess so PLEASE HELP! You can make an educated guess by substituting

asked by Anonymous on January 16, 2007
22. ## UIC

Calculate pCd2 at each of the following points in the titration of 55.00 mL of 0.0020 M Cd2 with 0.0020 M EDTA in the presence of the auxiliary complexing agent NH3. The solution is buffered at a pH of 11.00. Take the NH3 concentration to be a constant

asked by achut on July 18, 2013
23. ## math

a. A box contains three white balls and two red balls. A ball is drawn at random from the box and not replaced. Then a second ball is drawn from the box. Draw a tree diagram for this experiment and find the probability that the two balls are of different

asked by Anonymous on October 9, 2010
24. ## econ.

If the reserve requirement is 20% and a bank doesn't have excess reserves, why would a \$100 deposit lead to a greater than \$100 increase in the money supply. because of the money multiplier. A \$100 deposit (e.g., into a checking account) gives the bank

asked by Carter on May 6, 2007
25. ## Quotations and commas

It seems as though I have forgotten where to put commas when I'm listing and using quotations... Would it be... I see words that refer to “planning”, “listing”, and “outlining”, which are sequential related. OR I see words that refer to

asked by R on October 30, 2006
26. ## Chemistry

The normal freeing point of cyclohexane if 6.6 degrees Celsius. A 0.2g sample of an unknown solute is dissolved in 50 ml of cyclohexane (d-0.8g/ml, Kf=20 degreesCelsius/m. If the freezing point of the solution is 3.6 degrees Celsius, what is the molar mass

asked by Karolina on March 2, 2011
27. ## chemistry

the Ka for acetic acid, HC2H3O2, is 1.8x10-5 at 25 deg. Celsius. In a .10 M solution of potassium acetate, which of the following are true? I. [HC2H3O2] = [OH-] II. [H+] = [OH-] III. [C2H3O2-] < .10 M a. I only b. II only c. III only d. I and II e. I, II

asked by Anonymous on April 22, 2007
28. ## math

Fupi used 0.2 of his salary,sh 32,800 per month for school fees,quarter of the remained amount,he deposited at the bank and the rest amount used for other expenses.How much were used for other expenses?#######please anyone one to help me with the

asked by kelvin on September 14, 2016
29. ## Biology

The problems of survival of animals on land are very different from those of survivial of animals in an aquatic environment. Describe four problems associated with animal survival in terrestrial environments but not in aquatic environments. For each

asked by Neil on March 18, 2012
30. ## Chemistry

Calculate the pH of 7.2 × 10-8 M HCl. Report your answer to the hundredths place. Next, What fraction of the total H in this solution is from the HCl? Report your answer to the hundredths place. I apologize for the re-post, but I felt the previous one was

asked by Chris on September 27, 2012
31. ## Chemistry

A solution contains 0.0500 M Ca2 (aq) and 0.0350 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca2 (aq) can be separated from the Ag (aq) by selective precipitation? -Solving the 1st one

asked by Jematormal91 on April 6, 2012
32. ## Chemistry

A 5.0-g Sample of KBr at 25.0 degrees celsius dissolves in 25.0 degrees celsius 25.0 mL of water also at 25.0 degrees celsius. The final equilibrium temperature of the resulting soltution is 18.1 degrees celsius. What is the enthalpy of of solution in

asked by Sally on December 2, 2010
33. ## Chemistry

What is the mass/ vol% ethanol in an ethanol water solution with density of 0.875g/ml and containing 65% ethanol by volume? The density of pure ethanol is 0.789g/ml? My calculation 0.875g/ml x 1000ml x 0.65/ 46.06 = 12.34m 12.34/0.789g = 15.6g I am not

asked by Fai on August 18, 2012
34. ## algebra1/McDougal Littell

Is this problem correct?I'm trying to solve the equation. 8xt7=4x-5 x=2 I don't understand what you mean by 8xt7. Do you mean 8x+7? Is this problem correct? 8x+7=4x-5 x=2 nope the answer id -3....if u plug in 2 it would be 23=3...they don't equal to each

asked by toni on November 12, 2006
35. ## Chem2

The vapor pressure of water (at 50.0 o C) is lowered by 17.0 torr when 36.1 g of an unknown non-electrolyte is added to 65.56 g water. Determine the molecular weight of the unknown. Density solution = 1.05 g/mL Vapor pressure H2O @ 50oC = 92.5 torr

asked by Laura on August 31, 2016
36. ## chemistry

When aqueous solutions of chromium(III) bromide and potassium phosphate are combined, solid chromium(III) phosphate and a solution of potassium bromide are formed. The net ionic equation for this reaction is:

asked by Anonymous on March 13, 2016
37. ## Math (Need help Urgent)

1. Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 . If the path of the

asked by Mary on June 18, 2015
38. ## chemistry

Bromine can be added to limonene to created a brominated compound. The balance equation is shown below. When 613 mg of limonene and 3.5 ml of a 10% (v/v) solution of Br2 in dicholomethane (a solvent) are combined, 959 mg of the product is isokated.

asked by bk on February 20, 2010
39. ## Physics

I have the following exercise: Verify that Ex=f(z-ct)+g(z+ct) is a solution of the one dimensional wave equation. But I don't get what I should do, I mean, isn't Ex the formula of the one dimensional wave equation itself? U.U How can I verify it? Thank

asked by Waves - AEC on March 8, 2018
40. ## Chemistry

How many grams of CaCl2 are needed to prepare 25.0 mL of .500 M solution? and What volume of 12.00 M HCL is needed to prepare 150.0 mL of .500 M HCL?

asked by Erin on April 17, 2017
41. ## CHEMHelp

Now sure how to do this! 1. DESCRIBE & CALCULATE how to make 750. mL of a 1.25 M sucrose solution 2. Concentrated HCl has a molarity of 12 M. DESCRIBE & CALCULATE how to make 1.50 L of a 3.00 M HCl.

asked by Lina on January 26, 2017
42. ## Chemistry

I need to know if I am anywhere in solving this problem: Please tell me if this is correct. The pH of a solution: 0.20 M CH3COOH and 0.10 M CH3COONa pH=pKa+log{[CH3COONa]/[CH3COOH]} pH= -log(1.8x10-5)+log{0.10/0.20} pH= 4.74+log 0.50= 4.74-0.30= 4.44

asked by curtis on May 6, 2010
43. ## math

A farmer has \$100.he has to buy 100 farm animals.He has to spend exactly \$100 and get exactly 100 farm animals. Whats a solution for this problem

asked by Francisca on May 18, 2010
44. ## Chemistry

A solution with pH = 4 has 1. relatively high concentration of OH- 2. relatively low concentration of H3O+ 3. relatively high concentration of H3O+ 4. zero concentration of OH- Some of the answers people are giving me are confusing. I just need to know if

asked by nan on October 22, 2011
45. ## Math

Find the solution. 1. sqrt2 sin x + 1 = 0 My ans: x = 5pi/4 + 2npi and 7pi/4 + 2npi 2. sec x - 2 = 0 My ans: x = pi/3 + 2npi and 5pi/3 + 2npi

asked by Anonymous on October 25, 2015
46. ## P. Chemistry

A solution of HNO2 is at equilibrium: HNO2(aq) + H2O(l) ⇔ H3O+(aq) + NO2-(aq) Water is added. After the water is added, is there any shift in the equilibrium?

asked by Tommy on March 8, 2010
47. ## Chem(check my work, mass percent acetic acid)

During the spoiling process, fruit juices often oxidize to create vinegar. A sample of a beverage with a mass of 2.578 grams reguires 18.62 ml of .095M NaOH for neutralization. What is the mass percent of acetic acid present, assuming that no other acids

asked by Kizner on June 12, 2006
48. ## science( chem)

When a 0.1M solution of weak acid HA was titrated with a 0.1M NaOH. The pH measured when Volbase=1/2Voleq point was 4.62. Using the activity coeficents, calculate pKa. fA-=0.854 and fHA=1.00 For this I'm confused once again. I know that using the activity

asked by christina on July 22, 2007
49. ## Statistics

Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 100, with a sample size of (i) 400, (ii) 1600. What is the effect of the sample size? (b) Find the margin of error for

asked by courtney on April 5, 2015
50. ## Language Arts

Which answer choice lists ALL of the common nouns in the following sentence? A few days before the race, Shauna met the girls on the street. days, race, Squeaky days, race, street days, race, Squeaky, girls days, race, girls, street ***?? In which sentence

51. ## chem

Calculate the equilibrium concentration of NH3,Cu^2+,[ Cu(NH3)]^2+ ,[Cu(NH3)2]^2+,[Cu(NH3)3]^2+,and[Cu(NH3)4]^2+ in a solution made by mixing 500.0 ml of 3.00 M NH3 with 500.0 ml of 2.00*10^-3 M Cu(NO3)2. The sequential equilibria are Cu^2+

asked by jack on November 17, 2015
52. ## Civics

"Washington lobbyists are working in Congress to block the rural reforms you (small farms) need," Obama said. "Rather than investing in rural opportunity, our government is handing out subsidies (money) to corporate mega-farms. Over the past decade, our

asked by Carla on May 24, 2017
53. ## chemistry

By how much will the vapor pressure of water decrease if a solution at 40.0°C is produced by dissolving 16.0212 g of K3PO4 (formula mass = 212.30 g/mol) with 40.8480 g of water. The vapor pressure of pure water at this temperature is 55.30 mmHg. If the

asked by kat on February 21, 2014
54. ## Math - Trig

The depth of water, h, in metres at time t, in hours, is given by the formula: h(t)=7.8+3.5sin[pi/6(t−3)]. Its a 24 hours period and t=0 is midnight. Provide an algebraic solution to determine the time(s) of day, the water reaches the depth of 10.29 m i

asked by Sherry on July 22, 2016
55. ## Chemistry

Sodium Azide, (NaN3), the conjugate base of hydrazoic acid, is sometimes added to water to kill bacteria. Given a 0.010 M solution of sodium azide, A) What is the [H+] concentration from the Azide base rxn? B) Given a 0.01 M NH4+, what is the [H+]? C) What

asked by Lovey dovey on May 31, 2013
56. ## Chem

In a coffee cup calorimeter, 50.0 mL of 0.100 M AgNO3 and 50.0 mL of 0.100 M HCl are mixed to yield the following reaction: Ag+ (aq) + Cl- (aq) -----------------> AgCl (s) The two solutions were initially at 22.60 °C, and the final temperature is 23.40

asked by Joe on November 2, 2011
57. ## Chemistry

At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.56. What is the Ksp of the compound at 22 °C? I have found my [OH-] concentration (3.63x10^-4) but I'm not sure I'm

asked by Miaow on April 1, 2012
58. ## chemistry

How would I go about doing this question, can someone explain it step by step please, my answer I keep getting is 1.17m CaCl2, but the answer is 1.35m CaCl2? A 1.30M solution of CaCl2 in water has a density of 1.1g/mL/ What is the MOLALITY? Also, when for

asked by DrFunk on June 16, 2009
59. ## Organic Chem

Bromine will react with limonene according to this reaction (there's a picture, but I can't get that on here. So I'll do my best to write it out). 136.23 g/mol + Br2 ------> 296.04 g/mol Suppose 627 mg of limonene was reacted with 3.7 mL of a 7.7% (v/v)

asked by Marvin on November 2, 2011
60. ## math

(4-y^2)/(y-2) = y/2 (4-y^2)/(y-2) = y/2 4 - y^2 = (y*(y-2))/2 4 - y^2 = (y^2-2y)/2 8 - 2y^2 = y^2 - 2y 3y^2 - 2y - 8 = 0 (keep the above equation in mind) quadratic formula: (-b +/- sqrt(b^2 - 4ac))/2a now solve by plugging in the appropriate numbers and

asked by math on October 30, 2006
61. ## Science

A)Could you add marbles to a beaker filled with sand and get the same results? B)How does the Particle theory model explain that a substance can be solid while having spaces between its particles? C)Why does 50 ml of water and 5oml of sugar NOT produce 100

asked by Harmony Ann on February 24, 2014
62. ## Chemistry, help!

how do you calculate this: Calculate the mass of copper needed to displace 5.0g of silver from silver nitrate solution. (Relative Atomic Masses: Ag=108, Cu=63.5) Eqn=Cu+2AgNO3->Cu(NO3)2+2Ag How do you write a half equation? Complete the half equation to

asked by Anonymous on January 20, 2008
63. ## Chemistry - help

This is a test for chlorides in NaOH sample. 1.0g of NaOH was dissolved in 5ml of distilled water, acidified with 4ml of dilute nitric acid and diluted to 15ml with distilled water. This mixture was poured into a test tube containing 1ml of AgNO3 solution.

asked by candy on September 21, 2010
64. ## Chemistry

1. Hydrogen bromide(HBr) is a strong, highly corrosive acid and what is the pOH of a 0.0375M HBr solution? a)12.57 b)12.27 c)1.73 d)1.43 I can't fogure out what the answer should be as I don't know whether 0.0375M is the [H^+] or [OH^-] If 0.0375M is the

asked by anonymous on April 21, 2009
65. ## I need help with this research

You are a peace officer trainee assigned to your first post of duty. Your supervisor calls you into his office and tells you that he needs you to prepare content for a presentation at a local university for students in a criminal justice program. He

asked by Jon Blare on August 30, 2006
66. ## Writing

Essay question: How does playing violent video games influence violence in those who play them? Playing violent video games influence violence in those who play them? *Those who play them: I clarified my audience to specifically adolescents because young

asked by A on March 26, 2018
67. ## English - Personal Statement

How do you write a good personal statement for acceptance? (Any topic). I drafted, but I did not know what to write about, so I just wrote about my sister :/ My sister and I are not alike in any way, we do not even share the same blood. Growing up though,

asked by Marie on December 30, 2012
68. ## English

I included a few questions and a short paragraph about a teenager talking about the internet (Do you think I should add other reasons for using the net?) 1) What does the sentence "I'm sick leaving" mean? Does it mean "I'm on scik leave?" 2) My students

asked by Henry2 on February 14, 2012
69. ## AP Chem

Write the overall net-ionic reaction that occurs when iron (ii) hydroxide (Fe(OH)2, Ksp = 7.9 x 10^-15) is dissolved in a 0.500 M sodium cyanide solution forming a complex ion. (Fe(CN)6^4-, Kf = 7.7 x 10^36) Determine the value of the equilibrium constant

asked by frank on March 26, 2017
70. ## Math

Ricardo has a \$50.00 gift card for an electronics Store. He also has a coupon good for \$10 off his Purchase. Let a represent the amount of merchandise Ricardo can buy from the store using his gift card and coupon. Graph the solution set for a on the number

asked by Donald on February 21, 2017
71. ## Dynamics

A car weighing 3220 lb a curve of 200 ft radius bank at an angle of 30°. Find the friction force acting on tires when the car is traveling at 60 mph. The coefficient of friction between the tires and the road is 0.9. show solution step by step show FBD

asked by 18 on July 14, 2018
72. ## Math

For a certain day, the depth of water, h, in metres in Tofino, B.C at time t, in hours, is given by the formula: h(t)=7.8+3.5sin[pi/6(t-3)], tE[0,24]. Assume t=0 represents midnight. Provide an algebraic solution to determine the time(s) of day, the water

asked by Aidan on July 23, 2016
73. ## Chemistry

i need help. Calculate the pH of a 0.24 M CoCl3 solution. The Ka value for Co(H2O)63+ is 1.0 10-5. how do u do these with like the Cl there? Responses Chemistry - DrBob222, Monday, February 16, 2009 at 12:35am Just ignore the Cl^-. Co(H2O)6Cl3 ==>

asked by Lindsey on February 16, 2009
74. ## Plz Check My Geometry

Out of 30 questions these few I struggled with. I put what I feel was right but to be sure I would like some one to check my answers and if there wrong redirect me on how to get the correct answer.( after the = is the answer i think it is. 1.) Given points

asked by Ariel on June 9, 2010
75. ## Plz Check My Geometry

Out of 30 questions these few I struggled with. I put what I feel was right but to be sure I would like some one to check my answers and if there wrong redirect me on how to get the correct answer.( after the = is the answer i think it is. 1.) Given points

asked by Ariel on June 9, 2010
76. ## chemistry

If one-fourth cup of vinegar contains 0.049 mole of HC2H3O2, how many grams of baking soda will react with this amount of acetic acid? What would be the percent by weight of HC2H3O2 in this one-fourth cup of vinegar solution? (assume density of vinegar is

asked by michael smith on July 25, 2011
77. ## Science

you reacted magnesium with a hydrochloric acid aqueous solution and hydrogen gas was produced. Let's say that you collected the gas given off by the reaction and measured it's pressure as 102.1 kPa. If the vapor pressure of water is 16.2 kPa at this

asked by Mi on November 28, 2017
78. ## CHEMISTRY HELP! ICE TABLES?

At a certain temperature, K = 9.1 10-4 for the following reaction. FeSCN2+(aq)= Fe3+(aq) + SCN -(aq) Calculate the concentrations of Fe3+, SCN -, and FeSCN2+ in a solution that is initially 4.0 M FeSCN2+. OKAY SO i started by doing an ice table with

asked by Taylor on January 15, 2009
79. ## trigonometry

Solution of problem: An electric post was broken by a strong typhoon .it rmed a right triangle with the ground.If a broken part makes an angle of 25 degrees with other part and the topmost part of the post which on the ground is 40 feet from the base ,how

asked by Anonymous on September 17, 2012
80. ## Chemistry

Amino acid solution was made by taking 3.58 g of the dry amino acid and making it up to 1.00L in water. A 25.0 mL sample was taken and titrated with NaOH of concentration of 0.0493M, with the first equivalence point at 18.15 mL and the second equivalence

asked by k on May 20, 2012
81. ## organic chemistry

4. A 300-ml aqueous solution containing 40 g compound A is to be extracted with ether. The solubility of compound A in either at room temperature is 20 g per 100 ml and in water is 13.3 g per 100 ml. calculate the weight of the compound that would be

asked by em-em on February 7, 2016
82. ## Chemistry

you reacted magnesium with a hydrochloric acid aqueous solution and hydrogen gas was produced. Let's say that you collected the gas given off by the reaction and measured it's pressure as 102.1 kPa. If the vapor pressure of water is 16.2 kPa at this

asked by Milo on November 28, 2017
83. ## Chemistry

I don't know how to do Titration problems! I have an emergency homework assignment that's crucial to my grade! Please help with tips and step by step response! Please help!- 1. 50ml of 0.3 M KOH are required to titrate 60 ml of H^2SO^4. What is the M of

asked by Kristen on May 11, 2015
84. ## Chem1LB

When 0.917 g of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 3.76C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant

asked by Alex Le on February 17, 2010
85. ## chemistry

You are analyzing a solid isolated from a reaction and find that its boiling point is over 1000 ∘C. You dissolve the compound in water solution and recrystallize it to produce some solid crystals that you use to determine that the compound is a

asked by Sheila on January 23, 2014
86. ## physics

We are doing the force table lab in class and now we are calculating the f equilibran and the equilibrant angle. I had no time graphing a solution and came up with the right answers by measuring, but we are also suppose to do it purely mathematically and I

asked by Pat on June 7, 2013
87. ## chemistry lab

When 0.969 g of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 397C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant

asked by tweety on February 23, 2009
88. ## Chemistry

The solubility of acetanilide in hot water (5.5 g/100 mL at 100C) is not very great, and its solubility in cold water (0.53 g/100 mL at 0C) is significant. What would be the maximum theoretical percent recovery from the first recrystallization of 0.5 g of

asked by david on September 20, 2012
89. ## Chemistry

I am not sure if I calculated the exact molarity of the potassium permanganate. I multiplied the molarity of the potassium permanganate by the liters of potassium permanganate used in the titration and divided it by the total liters of solution. I don't

asked by Zach on November 28, 2012
90. ## Physics

An object is swinging from a point that is horizontal compared to the lowest point the object will reach (where the rope is vertical). If the length of the rope is 2 meters and the mass of the object is 30 kg, what is the tension in the rope at the bottom

asked by Trevor on November 18, 2007
91. ## Chemistry

Calculate the amount (g) of each of the following salts that need to be added to a 200 mL volumetric flask to produce a 2 M solution of S. CaSO(subscript 4) [NH(subscript 4)subscript 2]SO(subscript 4) NOTE: the subscript 2 is outside the (NHsubscript 4)

asked by Sejul on January 19, 2013
92. ## Chemistry

The number of moles NaOH needed to reach the equivalence point is mol, which means we must add liters of NaOH. The total volume of solution at the equivalence point will be liters. From the above information, the molarity of NaF at the equivalence point is

asked by Elizabeth on March 13, 2013
93. ## math

an open box with dimension 2 inches x 3 inches x 4 inches needs to be increase in size to hold 5 times as much as material as the current box? a. write a function that represents the new box b.find the dimension of the new box c.make a mathemathical

asked by kris linbern on November 4, 2016
94. ## Chemistry

I am not sure if I calculated the exact molarity of the potassium permanganate. I multiplied the molarity of the potassium permanganate by the liters of potassium permanganate used in the titration and divided it by the total liters of solution. I don't

asked by Zach on November 28, 2012
95. ## Math

what is the solution to the system of equations? 5x + 4y = 8 x - 2y = 10 (not multiple choice) my answer: (-5, -1) What are the missing values? (coincident) 4x + 5y = 8 8x + ____ y = _____ (Not multiple choice) Im not sure how to do this one collection of

asked by Anonymous on November 19, 2014
96. ## English

posted by rfvv Friday, February 3, 2017 at 10:33am. 1. The guests talked about a lot of topics on the talk show. 2. The guests talked about a lot of topics in the talk show. --------------------------- Which one is correct? Do we have to use 'on' here? 3.

asked by rfvv on November 7, 2017

Hi! Sorry, I don't know what subjects you teach, but can you check my answers please? 1. Starches and sugars that provide energy (1 point) kidneys enzymes carbohydrates vitamins 2. The system that removes waste from the body and controls the body's water

asked by Delilah on October 31, 2012
98. ## History

Plz Check My Answers 1. Which group most benefited from new settlement in South Texas during the 1840s and 1850s? A. Anglos B. Tejano patrons C. Enslaves African Americans D. German immigrants *(My answer is A)* 2. What was the U.S. Army's solution to the

asked by 🥞🥛💖 on November 26, 2018
99. ## CHEMISTRY

Hey 1)how do you estimate the line widths (full width half maximum) of the peaks arising from: (a) The emission of a hollow cathode lamp (b) The absorption peak of caffeine in the UV –visible spectrum (c) The d-d transition observed for Ni2+ in aqueous

asked by Kelly on March 26, 2010
100. ## Chemistry

Given the following functions, answer the questions: Temperature (°C) Kw 0 1.1410−15 25 1.0010−14 35 2.0910−14 40. 2.9210−14 50. 5.4710−14 Is the autoionization of water exothermic or endothermic? (b) What is the pH of pure water at 35°C? (c)

asked by Margaret on February 19, 2013