# 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 116
1. ## Chemistry

An aqueous solution is made by dissolving 23.9 grams of cobalt(II) bromide in 405 grams of water. The molality of cobalt(II) bromide in the solution is___m.

asked by Ebony on May 4, 2017
2. ## Chemistry

4.00 grams of NaOH have been added to 2.0 liters of water. The molarity of this solution is ____M. the concentration of this solution is ______ grams of NaOH per liter of water

asked by Maria on August 6, 2010
3. ## chemistry

If you begin with 100.0 mL of a 3.0 Molar solution of ammonium sulfate and 100mL of a 2.0 Molar solution of barium phosphate how many grams of Barium sulfate would be produced?

asked by jackie on February 10, 2011
4. ## Chemistry

You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.240 M sodium benzoate. How much of each solution should be mixed to prepare this buffer?

asked by Jematormal91 on March 29, 2012
5. ## Chemistry

Urea, (NH2)2CO, is dissolved in 73.5 g of water. The solution freezes at -0.095°C. How many grams of urea were dissolved to make this solution? (Answer must be in grams)

asked by Irma on March 29, 2011
6. ## Chemistry

you need to prepare 100 ml of ph=3.50 buffer solution using 0.100 M formic acid and 0.200 M sodium formate. how much of each solution shoudl be mixed to prepare this buffer?

asked by Navi on December 14, 2015
7. ## chemistry

A buffer solution is made by dissolving 0.45 moles of a weak acid (HA) and 0.23 moles of KOH into 720 mL of solution. What is the pH of this buffer? Ka = 6.2 × 10−6 for HA. Answer in units of pH. i need the answer

asked by Anonymous on January 31, 2015
8. ## Chemistry

If you begin with 100.0 mL of a 3.0 Molar solution of ammonium sulfate and 100mL of a 2.0 Molar solution of barium phosphate how many grams of Barium sulfate would be produced?

asked by jackie on February 10, 2011
9. ## Chemistry

You have a 12 M solution of hydrochloric acid. How many milliliters of this solution will give 25.0 mL of 2.0 M hydrochloric acid when diluted? Very confusing, If I can get a step by step process on how to figure this out, that would be great.

asked by George on September 6, 2008
10. ## chemistry

When a solution is diluted with water, the ratio of the initial to final volumes of solution is equal to the ratio of final to initial molarities. true or false?

asked by KRisten on March 9, 2011
11. ## Chemistry

A .2688-g sample of a monoprotic acid neutralizes 16.4 mL of .08133 M kOH solution, calculate the molar mass of the solution? First of all how can I calculate the molar mass?

asked by Bob on March 5, 2015
12. ## Chemistry

You have a 12 M solution of hydrochloric acid. How many milliliters of this solution will give 25.0 mL of 2.0 M hydrochloric acid when diluted? Very confusing, If I can get a step by step process on how to figure this out, that would be great.

asked by George on September 6, 2008
13. ## Chemistry

You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.180 M sodium benzoate How much of each solution should be mixed to prepare this buffer?

molarity of a solution containing 5mL of a 3.512 x 10^-5M solution (made from .128g of benzophenone and 50mL of ethanol) and then filled to the 50mL line of ethanol would this be (3.512 x 10^-5)(-.04) ?

asked by john on February 1, 2009
15. ## chemistry

A solution contains 2.0 × 10^–3 M Ba^2+ and 1.0 × 10^–2 M Sc^3+. A source of F^– is slowly added to the solution. Will BaF2 (Ksp = 1.84 × 10^–7) or ScF3 (Ksp = 5.81 × 10^–24) precipitate first? I believe that ScF3 would precipitate first but

asked by casey on May 19, 2015
16. ## chem

How many liters of 12.3 molar NaOH stock solution will be needed to make 12.4 liters of a 1.2 molar NaOH solution? Show the work used to solve this problem.

asked by jose on April 6, 2011
17. ## Chemistry

Consider the titration of 10.00 mL of a 0.250 M aqueous solution of ethylenediamine (H2NCH2CH2NH2) with 0.250 M HCl(aq). pKb1 = 4.07 and pKb2 = 7.15. What is the pH of the ethylenediamine solution prior to the start of the titration?

asked by sea lively on August 2, 2018
18. ## Chemistry

A volume of 150mL of 0.35M HCl is to be prepared from 80% HCl stock solution. (Density of HCl = 1.191g/mL). Calculate the molarity of 80% HCl stock solution.

asked by K on August 9, 2013
19. ## Algebra

How many milimiters of pure acid must be added to 150 milimiters of a 30% solution of acid to obtain a 40% solution? I know that the answer is 25 milileters. Could someone show me with steps how to get the answer.

asked by Mark on September 19, 2010
20. ## Chemistry

Assuming that the [Potato extract] is .001 M and I am going to make a 10 ml solution and each drop is 1/20th of a mL, how do I calculate the [Potato extract] in each reaction solution, using 20 drops, 15, 10, and 5 drops for each one?

asked by Patricia on February 6, 2013
21. ## Algebra

Meryl needs to add enough water to 11 gallons of an 18% detergent solution to make a 12% detergent solution. Which equation can she use to find g, the number of gallons of water she should be added

asked by Que on December 14, 2015
22. ## Chemistry

When the concentration of a weak acid in solution is equal to the concentration of its conjugate base in solution, then: Would pH=pKa or would it equal pH=pKa + 1 like Henderson-Hasselbalch equation?

asked by Marcus on April 7, 2013
23. ## Algebra 1

1. What is the domain of the function {(18,34),(22,64),(94,36),(11,18),(91,45)}? 8.what is the equation of the line that includes the point (4,-3) and has a slope of -2? 12.what is the solution to the following system of equations? Y=2x-4 y=x 15.which

asked by Elyon on January 21, 2012
24. ## caley

A solution contains 2.0 × 10^–3 M Ba^2+ and 1.0 × 10^–2 M Sc^3+. A source of F^– is slowly added to the solution. Will BaF2 (Ksp = 1.84 × 10^–7) or ScF3 (Ksp = 5.81 × 10^–24) precipitate first? I believe that ScF3 would precipitate first but

asked by chemistry on May 19, 2015
25. ## chemistry.

How many grams of sodium chloride are there in 55.00 Ml of a 1.90 M aqueous solution of sodium chloride? any idea. 2. What is the concentration of chloride ions in a 0.193 M solution of potassium chloride?..heeeeeeeeeeeelp.

asked by Cool boy. on November 15, 2009
26. ## Algebra

Find the discriminant and solutions for the following equations. #1) 9x^2+6x+1=0 #2) -2x^2+3x-2+0 I will be happy to critique your work. what is b^2-4ac? #1) 9^2-4(6)(1)= 81-4(6)= 81-24=57 so then 57 is the solution but what is the discriminant or is 57

asked by Algebra Student on May 15, 2007
27. ## biology

15. Imagine you have a sibling that needs a kidney transplant. You offer to give your kidney. What reaction against the red blood cells in the donor kidney would occur if you had different blood groups? Even if you had the same blood groups why might you

28. ## Chemistry

Can someone please check my work? Calculate the mass of (NH4)2S2O8 needed to prepare 250mL of a 0.100M solution. I got 5.705 g. Calculate the volume of 2.00M KI needed to prepare 250mL of a 0.200M solution. I got 0.025L or 25mL. Calculate the volume of

asked by Rachel on January 22, 2011
29. ## Chemistry

A solution was made by dissolving 62.07 grams of a compound in 500g of water. The compound was not ionic. The freezing point of the solution was measured and found to be -1.86 degrees celsius. Using the Kf value in your textbook, the molar mass of this

asked by Hannah on February 12, 2012
30. ## Chemistry

Measuring the conductivity of an aqueous solution in which 0.0200 mol CH3COOH has been dissolved in 1.00 L of solution shows that 2.96 % of acetic acid molecules have ionized to CH3COO- ions and H3O+ ions. Calculate the equilibrium constant for ionization

asked by Vanessa on November 12, 2013
31. ## Chemistry

How do you calculate the standard enthalpy change for the reaction of an aqueous solution of barium hydroxide, Ba(OH)2, with an aqueous solution of ammonium nitrate, NH4NO3, at 25 degrees C? The complete ionic equation is: Ba2+(aq) + 2OH-(aq) + 2NH4+(aq) +

asked by Lisa on April 2, 2013
32. ## drying agent in chem

Is it advisable or not to leave a solution in drying agent for a few days? ~I did this ..since my chem lab instructor said to but I'm not sure I believe him. He sounded unsure of himself when he answered me. solution: methylene chloride (extracting oil of

asked by ~christina~ on October 27, 2007
33. ## Chemistry

In a coffee cup calorimeter, 1.60 g of NH4NO3 is mixed with 75.0 g water at an initial temperature of 23.50 ºC. When the salt was completely dissolved, the solution temperature of the calorimeter became 21.80 ºC. Assume the solution’s specific heat

asked by Eddie on March 10, 2014
34. ## Chemistry

could someone help me with this question? A quantity of 400 mL of .6 M HNO3 is mixed with 400 mL of .3 M Ba(OH)2 in a constant pressure calorimeter of negligible heat capacity. The initial temperature of both solutions is the same at 18.46 degrees Celsius.

asked by Tokey on April 25, 2010
35. ## chemistry

10 ml of 0.9% physiological solution sold in the pharmaceutical trade, was treated with an excess of precipitating solution of AgNO3 to 2m, leading to the formation of a white precipitate of silver chloride (AgCl), which weighed after the realization of

asked by shania on August 18, 2018
36. ## history

What happens in the elections of 1824? Thank you for using the Jiskha Homework Help Forum. I would not say "what happens" but rather "what happened." Here are some links for you: 1. http://en.wikipedia.org/wiki/United_States_presidential_election,_1824 2.

asked by Mack on March 25, 2007
37. ## can someone edit my essay? thanks!

Gorbachev did not think about all the consequences that would happened if he changed Russia into perestroika. He underestimated the effect that perestroika would have on Russia. Yes, his political initiatives were great for freedom and democracy but all

asked by henrey on April 25, 2007
38. ## Social Studies

6. How did the Dust Bowl affect farmers? A.) Crop prices rose and farmers grew rich off of the profits. B.) The Dust Bowl was in the city and didn’t affect farmers. C.) Farmers lost their crops and left their farms in search of work. D.) Farmers were

asked by Deborah on January 24, 2013
39. ## chemistry

2.) Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is red, and C is yellow. In the reactions in which they participate, they are reduced to A-, B-, and C- ions respectively, all of which are colorless. When a solution of

asked by kate on March 2, 2011
40. ## chemistry

2.) Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is red, and C is yellow. In the reactions in which they participate, they are reduced to A-, B-, and C- ions respectively, all of which are colorless. When a solution of

asked by kate on March 2, 2011
41. ## Math help asap!!!

5(x – 9) = 5x no solution one solution infinite solutions –2(x – 1) = 2x – 2 infinite solutions one solution no solution

asked by Princess Anna on January 21, 2014
42. ## Alg help

10(x-2) = 10 one solution no solution infinate solutions -2(y-3)= 2y- 6 one solution no solution infinate solutions

asked by Aniston on January 15, 2014
43. ## Algebra Multiple Choice help!!

I need help with these! I got B for 1. C for 2. and D for 3. Thanks for the help! 1.) Find the values of a, b, and c that will make the statement true. [5 a -2] [5 102] [3 4 –b] = [-3 -4 3] [2c 5 9] [-2 5 9] a.) 8R1-R2--> =R2 b.) -8R1-R2 -> =R2 c.)

asked by Kris on March 28, 2013

I need help with these! I got B for 1. C for 2. and D for 3. Thanks for the help! 1.) Find the values of a, b, and c that will make the statement true. [5 a -2] [5 102] [3 4 –b] = [-3 -4 3] [2c 5 9] [-2 5 9] a.) 8R1-R2--> =R2 b.) -8R1-R2 -> =R2 c.)

asked by Becca on March 28, 2013
45. ## Algebra Multiple choice!!! Help

1.) Find the values of a, b, and c that will make the statement true. [5 a -2] [5 102] [3 4 –b] = [-3 -4 3] [2c 5 9] [-2 5 9] a.) 8R1-R2--> =R2 b.) -8R1-R2 -> =R2 c.) –8R1 +R2 -> =R2 d.) 8R1-R2 -> =R2 2.) Solve the system by triangularizing the

asked by Kris on March 28, 2013
46. ## Chem

At 58.8 degrees C and at a total pressure of 1.00 atm the mole percent of acetone in the vapor state above a solution of acetone and water containing 70. mol % acetone is 87.5%. Assuming the solution to obey Raoult's Law, determine the vapor pressure of

asked by Chris on March 27, 2007
47. ## analytical chemistry

DrBob222, it is me again. Continue the question 5mL of a solution A (unknown concentration) was transferred into sic 25mL volumetric flask. The following volumes of a standard solution of A with with a concentration 75ppm were added to the flask: 0mL,

asked by katy on May 10, 2015
48. ## ordinary differential equation

A contains 200 liters of solution in which is dissolved 40 kg of salt. Tank B contains 400 liters of solution in which are dissolved 80 kg of salt. Pure water flows into tank A at rate of 10 liters per second. There is a drain at the bottom of tank A.

asked by thigan on May 21, 2016
49. ## 1 chem question

A base has a Kb of 2.5 x 10–11. Which of the following statements is true? This is a concentrated base. This base ionizes slightly in aqueous solution. This is a strong base. An aqueous solution of this base would be acidic. (do explain. i don't

asked by Sara on February 14, 2012
50. ## English

1. The water stays in the glass. 2. The water stays inside the glass. 3. The water remains in the glass. 4. The water remains inside the glass. [Can we use all the sentences?] 5. Put salt in one glass. 6. Put salt into one glass. [Can we use both

asked by rfvv on November 1, 2017
51. ## Chemistry

Based on the following observations for 3 unidentified metals (Z, X, and D) and solutions of their metal cations (Zn+ and En+), rank the metals in terms of reducing agent strength, from lowest to highest. -When metal X is placed in an aqueous solution of

asked by Nathaly on April 2, 2017
52. ## Chemistry

When a clear aqueous solution of calcium chloride (CaCl2) is mixed with a clear aqueous solution of sodium carbonate (Na2CO3), a white solid precipitate forms. What happens to the mass of the mixture after the solid precipitate forms? Choose the best

asked by Lily on September 25, 2012
53. ## Biochemistry

On preparation of a solution of protein, you attempted to dissolve the substance in water, but a suspension resulted. Drop-wise adition of NaOH solution, with stirring, eliminated the suspension. Addition of acid to the original suspension had no effect.

asked by Andrew on January 25, 2009
54. ## (Math) PLZ CHECK ANSWERS

1. Which number is a solution of the inequality? 10.68 A)-5 B)-6 C)6 D)7*** 3. Which number is a solution of the inequality? 6>z(10-z) A)0 B)1 C)2 D)3*** 4. What are all the subsets of the set? {-1,9} A) 0, {-1}, {9}*** B) {-1}, {9}, {-1, 9} C) 0, {-1},

asked by Katrina on October 28, 2016
55. ## math

Ok, so when you are solving an equation, and you have an answer such as 5x=0 , does that mean that it is no solution or all real #s? And, when the answer is 4=4 , does that mean it is no solution or all real #s? And when the answer is 2x=2x, does that mean

asked by K on May 7, 2013
56. ## Chemistry

HOBr (aq) H+ (aq) + OBr- (aq), Ka = 2.3 x 10^-9 Hypobromous acid, HOBr, is a weak acid that dissociates in water, as represented by the equation. (a) Calculate the value of [H+] in a solution of HOBr that has a pH of 4.95. Ans: 1.1 * 10^-5 M (b) Write the

asked by Confused on April 10, 2012
57. ## English

In the novel; Twelfth Night A quote is stated: "And thus a whiligig if time brings in his revenges" I am to write an essay on this. I have put some ideas together, yet I am unable to create an intro. Could you help by giving me a few hints on how to start

asked by Gina on October 8, 2006
58. ## SS

Correctly identify ALL that happened with the rebuilding Japan after WWII. A) The U.S. divided Japan along the 17th parallel line in order to occupy both nations and prevent the spread of communism. B)Japan adopted a new constitution and democratic

asked by Zoey on September 14, 2017
59. ## Medical Terminology

You are a front office medical assistant. A second front office medical assistant is going to be hired, and you have been asked by the office manager to help her screen job applicants for the position. The office manager asks you to put together a short

asked by Clinard on April 30, 2009
60. ## math

A fire covers 420 acres and continues to spread at a rate of 60 acres per day. a.How many total acres will be covered in the next 2 days? b. Then write an expression for the total area covered by the fire in x days. c. The firefighters estimate that they

asked by Michelle on September 17, 2012
61. ## Calculus

Hello, I'm having trouble with this exercise. Can you help me? Integral of (x* (csc x)^2)dx I'm using the uv - integral v du formula. I tried with u= (csc x)^2 and used some trigonometric formulas, but the expression became too complicated, I couldn't

asked by Maria on March 15, 2007
62. ## Chemistry

Hydroxylapatite, Ca10(PO4)6(OH)2, has a solubility constant of Ksp = 2.34 × 10-59, and dissociates according to Ca10(PO4)6(OH)2(s) --> 10Ca2+(aq) + 6PO43-(aq) + 2OH-(aq) Solid hydroxylapatite is dissolved in water to form a saturated solution. What is the

asked by Angelyka on January 24, 2013
63. ## quantitative chemistry

Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I

asked by Jackie on March 22, 2013
64. ## chemistry

Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I

asked by Jackie on March 23, 2013
65. ## chemistry

A sample of fresh grapefruit juice was filtered and titrated with the I2 solution prepared in Part 2. A 100.0 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch end point. What is the concentration of Vitamin C in 100ml juice?

66. ## physics

Please answer asap with complete solution thanks a lot. I need the solution to answer other questions much alike to this one. :) Two electrons are 10^-15 meters apart. One electron is fixed on its position. The other, originally at rest, is released. How

asked by Jezrell on July 3, 2012
67. ## Physics

Please answer asap with complete solution thanks a lot. I need the solution to answer other questions much alike to this one. :) Two electrons are 10^-15 meters apart. One electron is fixed on its position. The other, originally at rest, is released. How

asked by Jezrell on July 3, 2012
68. ## CHM 152

At 20oC, a 2.32 M aqueous solution of Ammonium Chloride has a density of 1.0344g/ml. WHat is the molality of Ammonium Chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol?? I am not sure how to incorporate the density into the problem to

asked by Car on June 10, 2010
69. ## accounting

Can someone please check my answer to this question: In recent years, a company has greatly increased its current ratio. At the same time, the quick ratio has fallen. What has happened? Has the liquidity of the company improved? My answer: The decrease in

asked by help on January 19, 2008
70. ## Physics

Some forms of cancer can be treated using proton therapy in which proton beams are accelerated to high energies, then directed to collide into a tumor, killing the malignant cells. Suppose a proton accelerator is 4.21 m long and must accelerate protons

asked by Ashley on January 25, 2012
71. ## Physics

Some forms of cancer can be treated using proton therapy in which proton beams are accelerated to high energies, then directed to collide into a tumor, killing the malignant cells. Suppose a proton accelerator is 4.21 m long and must accelerate protons

asked by Sarah on January 25, 2012
72. ## Economics

The Tax Reform Act of 1986 eliminated the deductibility of interest payments on consumer debt (mostly credit cards and auto loans) but maintained the deductibility of interest payments on mortgages and home equity loans. What do you think happened to the

asked by Munroe on October 3, 2012
73. ## Biology 101

1. Which of the following statements is incorrect about homologous chromosomes? a. Homologous chromosomes are similar but not identical b. Homologous chromosomes have the same size and function c. Homologous chromosomes contain genes for the same kind of

asked by Phillip on October 23, 2013
74. ## Chemistry

A saturated solution of barium chloride at 30 degrees celcius contains 150g of water. How much additional barium chloride can be dissolved by heating this solution by heating this solution to 60 degrees. Solubility of Bacl @ 30 degrees=38.2g/100g water

asked by Sumaiyah on June 20, 2013
75. ## Chemistry

A saturated solution of barium chloride at 30 degrees celcius contains 150g of water. How much additional barium chloride can be dissolved by heating this solution by heating this solution to 60 degrees. Solubility of Bacl @ 30 degrees=38.2g/100g water

asked by Sumaiyah on June 20, 2013
76. ## Chemistry

A saturated solution of barium chloride at 30 degrees celcius contains 150g of water. How much additional barium chloride can be dissolved by heating this solution by heating this solution to 60 degrees. Solubility of Bacl @ 30 degrees=38.2g/100g water

asked by Sumaiyah on June 20, 2013
77. ## English

This is the second part. Feedback is appreciated greatly. During my time in the class I was able to put many smiles on people's faces. With the help of my council, we took part in adopting over twenty families for Christmas, prepared/delivered food baskets

asked by Molly on June 18, 2009
78. ## Anthropology

Describe an incident you participated in or observed that involved cross-cultural miscommunication. What was the outcome? You can use an incident involving miscommunication between people of different genders. This sounds like a fun assignment. You missed

asked by Dale on June 18, 2007
79. ## chemistry

Here are 2 questions I worked out, but need them checked. Also, can't get answer to another question correct unless question 1 is correct. Would you check the first 2 and help me with the third? 1) What is the pH of a 0.05 M solution of TRIS acid (pka =

asked by alan on February 2, 2008
80. ## chemistry lab

Here are 2 questions I worked out, but need them checked. Also, can't get answer to another question correct unless question 1 is correct. Would you check the first 2 and help me with the third? 1) What is the pH of a 0.05 M solution of TRIS acid (pka =

asked by ryan on February 2, 2008
81. ## Health

1. What is needed to make blood cells? 2. What pair of workers is needed to produce estrogen? 3. What is needed to produce eleven hormones that control the actions of other endocrine glands? 4. What is needed to pass oxygen from lungs into blood vessels

asked by Hayley on December 4, 2011
82. ## math

Automobiles and small trucks make up 84% of the travel to and from work in the US. What fraction represents all other means of travel to and from work in the US? How would I set this up, I am guessing the answer is 16% but I have no clue how to get the

asked by Rhonda on June 1, 2007
83. ## college chemistry

a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O)

asked by yeng on January 6, 2015
84. ## chemistry

a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O)

asked by yeng on January 6, 2015
85. ## colligative properties

a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O)

asked by yeng on January 7, 2015
86. ## chemistry

a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O)

asked by yeng on January 6, 2015
87. ## Chemistry

Can you have one half-reaction take place, without the other half-reaction taking place immediately? The other half-reaction takes place when the cell potential is raised. I half witness this in some electrochemical cells. Sincere Thanks.

asked by Frances on November 15, 2010
88. ## science

ogranelle that modifies,packages and transport material out of the cell describes an organism that can exist onlly as a group of cells one of the structures a cell uses t o live ,grow and reproduce Why have you posted all these questions under different

asked by ruth on August 19, 2007
89. ## Microbiology

Four questions ... 1) How can you account for the observation that a mass or colony of bacteria shows pigmentation while the individual cells have transparent cytoplasm? 2) What factors may alter the expression of the cultural characteristics of bacteria?

asked by Cherie on March 25, 2008
90. ## Microbiology

Four questions ... 1) How can you account for the observation that a mass or colony of bacteria shows pigmentation while the individual cells have transparent cytoplasm? 2) What factors may alter the expression of the cultural characteristics of bacteria?

asked by Cherie on March 27, 2008
91. ## Math

1. Tell whether the system has one solution infinitely many solutions or no solution. 6y=-5x+24 2.5x+3y=12 a. one solution b. infinitely many solutions*** c. no solution 2. Tell whether the system has one solution infinitely many solutions or no solution.

asked by Kaai97 on January 11, 2016
92. ## Science

Please compare and contrast the electrochemical events involved in the initiation and propagation of an action potential with the electrochemical events involved with the initiation of muscle contraction in skeletal muscle. Be sure to describe the

asked by Jack on January 21, 2013
93. ## math

A solution of alcohol and water is a% alcohol where a = 40. The solution is found to contain 32 milliliters of alcohol. How many milliliters total (both alcohol and water) are in the solution?

asked by Sabre on November 8, 2010
94. ## Scenario Question?

Dan is an employee at a regional mid-size computer company that has recently been sold to a larger, national computer manufacturing corporation. Dan is in charge of computer production orders, and because of this recent shift in ownership, his

asked by Ree on May 27, 2008
95. ## chemistry

The density of acetonitrile, CH3CN, is 0.786 g/mL, and the density of methanol, CH3OH, is 0.791 g/mL. A solution is made by dissolving 15.0 g of methanol in 250.0 mL of acetonitrile. Assuming that the volumes of the solute and solvent are additive, what is

asked by S on February 5, 2015
96. ## Chemistry

The heat of solution of ammonium chloride is 15.2 kJ/mol. If a 6.187 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 26.5°C, what is the minimum temperature reached by the solution? [specific heat of water = 4.18 J/g°C; heat capacity

asked by Chris on May 5, 2014
97. ## chemistry

Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 % sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. Please provide steps

asked by anonymous on February 17, 2010
98. ## CHEMISTRY

If you use a dirty buret, the titrant leaves drops of solution behind as the meniscus descends during delivery of the solution. The volume actually delivered by the buret will be __________ the volume your readings of the buret scale indicate was delivered

asked by Anonymous on October 7, 2014
99. ## math

a 9 percent salt water solution is mixed with 4 oz. of an 18 percent salt water solution in order to obtain a 15 percent salt water solution. how much of the first should be used?

asked by Bob on September 2, 2010