1. physics

    A ski slope drops at an angle of 24 degrees with respect to the horizontal and is 500 m long. A 60 kg skier skis down from the top to the bottom of the slope. A.) Determine the change in gravitational potential energy of the skier+earth system. b.) If 20%

    asked by bibs on July 14, 2014
  2. Chemistry

    A sample of 8.44 grams of NaOH is dissolved into 536 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 1.96 gallons of water. You may assume that the two volumes can be added.) What is the concentration of NaOH in the

    asked by Alex on September 3, 2010
  3. Parametric equations/Trigonometry - Lattice points

    A lattice point is a point with integer coordinates. How many lattice points (x,y) with -100 less than or equal to x less than or equal to 100 and -100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=30-40

    asked by Sam on December 10, 2013
  4. Physics Mechanics (unsolved)

    An electron of mass 9.1E-31 kg is released from rest at a distance of 7.1 E-10 m from a fixed electron. The force on the movable electron is given by the function F = 2.3E-28/r^2, where r is the distance between the electrons. Find the maximum velocity (in

    asked by andrew on April 13, 2012
  5. Algebra II

    1 ) Find the inverse of g(x) = 5x -2 2) the graph (x-2)^2 + 3(y-2)^2 = 25 is graph of a(an) ______ 3) which equation has a vertex (5,- 4) a) y= (x+4)^2 - 5 c) y = (x-5)^2 -4 b) y = (x-4)^2 +5 d) y=(x+5)^2 -4 4) solve 8^x less than or equal to 25 5) name

    asked by Bread on July 30, 2012
  6. Physics

    Please help me with my physics homework I've been given a week and can't for the life of me work out how it is done. Tom has a rubber ball which weighs 5 kilograms and bounces 3.8 meters from a drop height of 4 meters using this information please work out

    asked by Jack on July 6, 2012
  7. language

    How do you diagram the sentence , The little girls adorn themselves with chains of dandelions.I hope this is alright if I cannot shew my work on the computer , but I shewed my work at home and just wanted to see if I got it correct. But just wanted to let

    asked by unnanimous on May 24, 2016
  8. business

    Leadership. Topics based in this research area may consider leadership styles, relationships, behaviour, followership, and anything else that works or doesn’t work as it related to having work conducted through others. what would be a good thesis for

    asked by jiskhayg on September 21, 2014
  9. To Bobpursley

    Ok I finally understand your work and it makes sense to me but I guess it's wrong and I don't see were I followed your work and got the same answer as you positive one... the only thing is I put the problem into my calculator and get negative one and the

    asked by To Bobpursley (Wrong answer???) on November 15, 2009
  10. science

    mrs rossow ran the Yakima river cayons marathon the course is 27.2 miles long and it took her 2 hours and 15 minutes to finish if she weighs 135pounds calculate the work and power she used. A.work B.power

    asked by sherrie on October 24, 2009
  11. Dot product

    I cant get the correct answer and I can't figure out what I am doing wrong. If a=(2,2k) and b=(4,k) are perpendicular, find k. I have worked it out, and I got -2 but it doesn't work when I check it in the original equation. It should be a.b=0 and then plug

    asked by Derek on June 30, 2008
  12. art and music

    A work of art can be critiqued in terms of: a. the viewer's likes and dislikes. b. the emotional responses the work elicits. c. how successfully the artist has used one or more of the artistic elements. d. the message the artist is attempting to

    asked by Bev on April 14, 2019
  13. Sociology

    Can someone give me an idea to what show or movie to analyze and discuss Amercian family? Also it needs to include transitions and problems in family life, stages of family and alternative family forms. I cannot think for any show or movie off the top of

    asked by BRANDY on May 21, 2012
  14. Math HELP PLEASE

    A particle P of mass m=1 moves on the x-axis under the force field F=36/(x^3) - 9/(x^2) (x>0). (a)Initially P is projected from the point x=4 with speed 0.5. Show that P oscillates between two extremes points and find the period of the motion. (b)Show that

    asked by Daphine on April 26, 2011
  15. physics

    The windshield of a speeding car hits a hovering insect. Consider the time interval from just before the car hits the insect to just after the impact. Which of the following are correct? (Select all that apply.) Choose the system so that the change of

    asked by marcos on February 10, 2012
  16. PHYSICS

    Three moles of an ideal gas are compressed from 5.5*10^-2 to 2.5*10^-2 m^3. During the compression, 6.1*10^3J of work is done on the gas, and heat is removed to keep the temperature of the gas constant at all times. Find the temperature of the gas. I

    asked by sTELLA on March 2, 2008
  17. operations management/supply chain

    Suppose you are managing a service system in which customers arrive at a rate of two per minute according to a Poisson process. You are investing in a single machine that provides the service and does so with exponential service time. Your objective is

    asked by joe on December 19, 2006
  18. Englidh 7 - Journal Entry (plz read)

    Demonstrating Perseverance I show perseverance when I study and work hard to raise my grade and never give up. My biggest goal is to make it to Yale University; I want to become an artist and a writer. I¡¦ll do whatever it takes to get accepted to that

    asked by Lauren on December 15, 2011
  19. Math cont.

    The neighborhood skateboard club is starting a fundraiser in order to buy more skateboards. They have decided to sell logo mugs. The Mugs on Mugs Company offers to supply mugs to the club for $3.75 each plus a $55 process and handling fee. The Punny-Cups

    asked by Jordan on October 16, 2009
  20. thesis paper

    Please help me paraphrase this statement. Thus human behavior is the product of an ongoing interaction between social environments and internal motivations (gained from previous social experiences). These systems include the home, family, religion,

    asked by Quiera on March 10, 2007
  21. physics

    A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.35 cm. If the spring constant is 222 N/m and the mass is 0.580 kg, determine the mechanical energy of the system. Determine the maximum speed of the mass. Determine

    asked by Anonymous on April 7, 2016
  22. Psychology

    Choose 5 activities you do daily and indicate whether the activity uses your sympathetic or parasympathetic nervous system. 3 of my daily activities are reading, walking, and writing. I need help thinking of 2 more. Also- How do I determine if the activity

    asked by Gabby on October 23, 2007
  23. statistics

    You are ordering a new home theater system that consists of a TV, surround sound system, and DVD player. You can choose from 1616 different TVs, 2222 types of surround sound systems, and 1919 types of DVD players. How many different home theater systems

    asked by Hallie on July 25, 2017
  24. Finance

    Sammy's Shovels had sales of $ 58,247 in 2010. The cost of goods sold was $ 36,014 , operating expenses (excluding depreciation) were $ 18,361 , interest expenses were $ 2,198 , depreciation expense was $ 7,821 , and dividends paid were $ 3,228 . The

    asked by Katie Elizabeth on September 9, 2014
  25. Chemistry- Dr.Bob

    1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 12 psi (vs. 14.7 psi at sea level). Under those

    asked by Sanaya on January 20, 2016
  26. English

    Thank you very much. Here is the second part. Some data are unclear. I hope you can help me. 1) “Focus group” led by the school principal made up of the participating students (or the students involved in the project), the contact person (also:

    asked by Henry2 on February 4, 2012
  27. LANGUAGE ARTS

    11. This question asks about your work in your reading role. You may use your novel to help you answer the question. Think about the work you completed in your reading role. Determine the ideas that would be most worthy to share in a literary discussion

    asked by help on December 16, 2016
  28. chem help w/ Lab

    Weight of the mustard package Sample: 3.02 (g) Weight of the mustard package Solution: 33.3 (g) Trial #1 Trial #2 Trial #3 Weight of Mustard Package Solution Delivered (g) : 1.09 .948 .909 Weight of NaOH Solution Delivered (g) : .354 .304 .269

    asked by Den on October 17, 2012
  29. Math - Algebra 2

    In a certain math class, each student has a text book, every 2 students share a book of tables, every 3 students share a problem book, and every 4 students share a mathematics dictionary. If the total number of books is 75.. how many students are in a

    asked by AS on December 2, 2006
  30. FRENCH WORK ASAP

    please please someone check my work I don't understand it fully so I am asking if someone could please check my work thank you if it's too much I'm sorry. God Bless

    asked by Hellokitty1993 on January 21, 2009
  31. science

    Need to prepare a lab that requires 1000ml of 1.0M HCl. You find some 3 M HCl to work with. What do you need and how would you work it out?

    asked by clair on February 17, 2011
  32. Math

    I don't understand this it says If the average of 6 numbers was 58, what could the 6 numbers be? That would take forever to work out. What is the easiest way to work that out

    asked by Sarah on July 24, 2012
  33. algebra

    Jared can work 54 math problems in one hour, how many problems can he work in ten minutes

    asked by roxanna on August 15, 2013
  34. Physics

    The work W0 accelerates a car from 0 to 20 km/h. How much work (in terms of W0) is required to accelerate the car from 20 km/h to 100 km/h?

    asked by Caleb on December 29, 2014
  35. Chemistry

    Given the balanced equation : 3 CO + 7 H2 -> C3H8 + 3 H2O How much C3H8 will be produced if 45.8 g CO reacts with 87.3 H2 ? Please all your work (i did it but im not sure if i did all the work right)

    asked by Dilcia on July 28, 2015
  36. HIT 105 research paper

    I am doing a paper on HIPAA and I need to cite my work. Have the paper finished but I am having problems citing my work. Could someone help me please?

    asked by Theresa on November 1, 2010
  37. fhjgf

    Omar made 378 for 78 hours of work at the same rate how much would he make for 12 hours of work?

    asked by gjfj on April 17, 2012
  38. Philosophy

    Can someone please check my answers if it is right. Thank you! True/False 1. Rosenstand argues that moral subjectivism is an intuitively sound, "live and let live" kind of moral position that is both appealing and socially cohesive. -FALSE 2. For the

    asked by ivy on July 11, 2014
  39. Math

    1. Find the next number in the pattern. -1, 3, 7, 11 a. 16 b.77 c.15

    asked by Zoe Mckenzie on December 2, 2015
  40. Calculus please help??

    The motion of a spring that is subject to dampening (such as a car's shock absorber)is often modeled by the product of an exponential function and a sine or cosine function. Suppose the equation of motion for a point on such a spring is

    asked by Emma on June 24, 2013
  41. More spots

    Question: A colorless unknown substance is spotted on a TLC plate and developed in the correct solvent. The spots do not appear when visualization with a UV lamp or iodine vapors is attempted. What could you do to visualize the spots if the compound is the

    asked by Sheryl on October 15, 2006
  42. chem

    Calculate [H3O] in the following solutions. 5.15x10-2M HCl and 7.62x10-2M NaC2H3O2 Responses HCl + NaC2H3O2. It appears there is an excess of H^+ which will react with NaC2H3O2 to form HC2H3O2. That gives you a buffer of C2H3O2 and HC2H3O2 and you use the

    asked by tomi on April 16, 2009
  43. Chemistry

    Question: a 25.00 mL. aliquot of a solution containing TI(aq) was treated with K2CrO4. the TI2CrO4 was filtered, washed free of excess precipitation reagent, and dissolved in dilute sulfuric acid. the dichromate ion produced was titrated with 40.60 mL. of

    asked by Anonymous on May 6, 2009
  44. math- help again please

    An employee earns $7.00 and hour for the first 35 hours worked in a week, and $10.50 for any hours over 35. One paycheck (before deductions) was for $308.00.How many hours did the employee work? Let t denote the overtime hours. Then you know that if the

    asked by pinkpolkadots on October 18, 2006
  45. Genetics

    Suppose a dominant gene for a particular disease is found on the X chromosome and is denoted as X^D. The mother is X^D X^D and the father is XY. What percent of the couple's children will show the disease? I understand how it works if the X^D gene was

    asked by Sydney on April 27, 2016
  46. math/algebra

    Division: x^2 + 2x - 15over 4x^2 divided by x^2 -25 over 2x-10 Will someone show me the steps to work this problem, I have looked and looked at my book but it still makes no sense to me. Help. First, change the division to the reciprocal of muliplication.

    asked by dee on August 19, 2007
  47. English

    Please kindly check my english grammar below: Dear Sir, My late attendance at work was due to the transportation were leaving at our accommodation at 8:30 am and our duty time would start at 9:00 am the distance going to work would be imposssible to reach

    asked by jesie on December 5, 2018
  48. Chemistry

    A solution is prepared that contains 0.0200 M AgNO# and 0.150 M KSCN. What is the equilibrium concentration of Ag+ ion in this solution? The Kf for Ag(SCN)4^3+ is 1.21x10^10 I'm not even sure how to set up this problem? Would I need to do an ice box?

    asked by nns40760 on November 29, 2014
  49. chemistry

    A solution is made by dissolving 811.0 cg of barium hydroxide, Ba(OH)2, in 0.1137 kg of water. What is the concentration in parts per million? I know the equation is: ppm= (mass of solute/mass of solution)10^6 Does the mass need to be in g or kg?

    asked by erica on May 11, 2014
  50. Chemistry

    when 7.50 grams of iodine (I2) is added to 48.7grams of carbon tetrachloride (CCl4), the iodine dissolves and a solution is formed. The weight percent of the iodine in the solution is? 7.50g I2/ 7.50 + 48.7 X 100 = 13.3 Did I do this correctly?

    asked by Hannah on February 11, 2012
  51. Chemistry

    A 5.00 mL sample of an aqueous solution of H3PO4 requires 43.2mL of 0.285M NaOH to convert all of the H3PO4 to Na2HPO4. The other product of the reaction is water. Calculate the molarity of the H3PO4 solution.

    asked by Duke on October 26, 2014
  52. Physics

    A car travels in a straight line with an average velocity of 80 km/hr for 2.5 hours and then with an average velocity of 40 km/hr for 1.5 hours. a. Calculate the largest displacement for the 4-hour trip. b. Calculate the largest average velocity for the

    asked by K on August 28, 2013
  53. Math

    Two six-sided dice are rolled at the same time and the numbers showing are observed. Find the following. a. P(sum=6) (1,6), (6,1) 1/36+1/36=2/36 b. P(sum=3) =1/36 c. P(sum is an odd number) 30/36 d. P(the two dice show same numbers) ? Can you check my

    asked by Keonn'a on October 9, 2018
  54. please help Pre-Calc

    The number of pounds of apples a cannery can produce and the processing cost are P(h) = 375h and C(n) = 0.35n + 1000 where P(h) is the number of pounds of apples that can be processed in h hours and C(n) is the cost of processing n pounds of apples. Use

    asked by Lily on October 5, 2017
  55. Math

    Need help solving this problem please. Andrei buys a painting and sells it to Boris Andrei makes a 60% profit on the sale Boris sells the painting to Clarissa Clarissa pays 1.5times the price that andrei paid for the painting Boris made a loss What is his

    asked by Maggie on June 23, 2008
  56. Math

    A vehicle starts w/ a full tank of gasoline and travels 150 miles. While refilling the tank, the driver notes that the vehicle used (1/4) tank of gasoline in traveling the 150 miles. Assuming the vehicle averages 25 miles per gallon, approximately how many

    asked by Helen on April 21, 2009
  57. physics

    A worker in a warehouse uses a rope passing through some pulleys to lift a heavy crate. The worker exerts a force five times less than the weight of the crate but has to move the rope four times as far as the crate moves. This situation... A) can happen

    asked by Belinda on July 5, 2014
  58. Chemistry

    You have a reaction using the following criteria: 1.3456 g of barium chloride solution (0.786M) is mixed with 1.20089 g of sodium sulfate solution (1.3M). The ambient pressure is 754.564 mmHg and the temperature is 56.889 degrees celsius. Determine the

    asked by Katie on April 26, 2011
  59. science

    50 ml of ZnSO4 solution was transferred to a mercury cathode and enough solid potassium nitrate is added to make the solution 0.1 M in KNO3. The electrolysis of Zn2+ is carried to completion of -1.3 V vs. SCE with the passage of 241 C of electricity.

    asked by Maya on November 5, 2012
  60. science

    50 ml of ZnSO4 solution was transferred to a mercury cathode and enough solid potassium nitrate is added to make the solution 0.1 M in KNO3. The electrolysis of Zn2+ is carried to completion of -1.3 V vs. SCE with the passage of 241 C of electricity.

    asked by Maya on November 5, 2012
  61. Chem

    This is the problem: In a 1-L beaker, 203 ml of 0.307 M ammonium chromate was mixed with 137 ml of 0.269 M chromium (III) nitrite to produce ammonium nitrite and chromium (III) chromate. Write the balanced chemical reaction occuring here. If the percent

    asked by Anonymous on October 30, 2006
  62. physics

    A disk with mass m = 5.2 kg and radius R = 0.44 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.59 m from the rope and at a frequency f = 18.6 rev/s (with a direction shown by the arrow). 1. What is the magnitude

    asked by stewart on November 24, 2014
  63. Finance

    how do solve a math question that states an employee has an annual salary of 26,965. after he arranges to have deducted from his salary 12% for the purchase of bonds, 17% for federal withholding tax, and 3% for a retirement fund, how do you solve this

    asked by Queen on October 7, 2011
  64. physics

    consider three charges: +Q, -Q, q where the center charge is equidistnat from the other two. assum that the two Qs cannot move. you also want to charge q to be at rest. if q=-8.0 nC, find Q+ You don't have to solve it but can you lead me in the right

    asked by jen on January 15, 2009
  65. Physics

    What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 186 km? What is the period of revolution? So GMm/r^2 = mv^2/r and I know that I need to solve for v but what do I use for the mass of the satellite? Do I just plug

    asked by winterWX on February 16, 2007
  66. Chemistry URGENT

    I have to match the items to the statements below, and I'm stuck! My answers are in parentheses, but I know that some of them are wrong. Please help if you know how...I would GREATLY appreciate it! A Dilute B Unsaturated C Saturated D Supersaturated 1.

    asked by Lindsay on April 24, 2007
  67. chem- acids and bases

    sorry to take up your time again, acids and bases just really confuse me, i'd really appreciate your help again. "What is the pH at the end point for the titration of 0.20M HNO2 by 0.20M NaOH? Ka nitrous acid= 4.5 x 10^-4." this is what i do know: - end

    asked by marie on April 16, 2011
  68. math

    A total of 129 players entered a single elimination handball tournament. In the first round of play, the top seeded player received a bye and the remaining 128 players played in 64 matches. Thus 65 players entered the second round of play. How many matches

    asked by austin on May 10, 2010
  69. HUM/205

    To what human experience does the work relate? O How is that human experience meaningful to your life? O How does the work express or relate to your human experience? O What social, cultural, and moral values does the work express

    asked by Suny on April 24, 2010
  70. Human Services Administrator

    What are some elements to a good appraisal system? Thank you for using the Jiskha Homework Help Forum. You do not state if you need this appraisal system in hiring or in evaluating an employee. Here are some links for you: 1. (Broken Link Removed) 2.

    asked by Marie on June 18, 2007
  71. math

    A total of 129 players entered a single-elimination hand ball tournament. In the first round of play, the top-seeded player received a bye and the remaining 128 players played in 64 matches. Thus, 65 players entered the second round of play. How many

    asked by Kristi on May 9, 2010
  72. Physics! HElp

    A g ice cube at -15.0oC is placed in g of water at 48.0oC. Find the final temperature of the system when equilibrium is reached. Ignore the heat capacity of the container and assume this is in a calorimeter, i.e. the system is thermally insulated from the

    asked by Idali on April 11, 2017
  73. social studies

    Which document establishes the separation of powers? a. the Bill of Rights b. the Articles of Confederation c. the Declaration of Independence d. the Constitution *** In what way did the structure of the Virginia House of Burgesses influence the

    asked by LAFAYETTE on December 12, 2016
  74. Math

    I posted this question earlier: a.) Maddie works at a desighner store. She earns $1925 per month plus 10% commission of her sales. Write an equation to show how much she makes b.) one month she earned $2725. Use your equation to show what her sales were

    asked by Olly on May 11, 2013
  75. AP Chem

    An aqueous solution contains 4.50 g of calcium chloride, CaCl2, per liter. What is the molarity of CaCl2? When calcium chloride dissolves in water, the calcium ions, Ca^+2, and chloride ions, Cl^-, in the crystal go into the solution. What is the molar

    asked by Anna on November 3, 2008
  76. Physics

    I did the problem but i'm confused on what to do next: 1.A hunter aims directly at a target (on the same level) 120m away. (a) If the bullet leaves the gun at a speed of 250m/s, by how much will it miss the target? (b) At what angle should the gun be aimed

    asked by LINA on January 18, 2016
  77. Chemistry

    "A voltaic cell is constructed by immersing a strip of sillver metal in a 1.0 MAgNO3 solution and a strip of cadmium metal in a 1.0M Cd(NO3)2 solution. The circuit is completed by a wire and a salt bridge in the usual way. a. Write the balanced overall

    asked by todd on March 10, 2011
  78. Physics

    Help with Physics homework Please and thank you!? I need help on these two questions. I'm not looking for the answer because I really need to learn how to do this on my own. But if someone could show me what equations to use to answer the steps in the

    asked by Meagan on May 20, 2014
  79. social studies

    How has the elimination of trade barriers affected the movement of goods among member countries of the European Union? A. Member countries are able to produce all the goods they need. B. Goods can move freely among member countries. C. Member countries no

    asked by Kciity on May 13, 2019
  80. Math

    I have two problemson polygonal convex sets which I do not understand. The first: Find the minimum value of f(x,y) = 2x-y+2 for the polygonal convex set determined by this system of inequalities: x is more than or equal to 1 x is less than or equal to 3 y

    asked by Joanie on January 20, 2009
  81. Algebra

    You go to the doctor and he gives you 13 milligrams of radioactive dye. After 20 minutes, 4.5 milligrams of dye remain in your system. To leave the doctor's office, you must pass through a radiation detector without sounding the alarm. If the detector will

    asked by Marina on September 24, 2015
  82. Quanitive Methods

    A car rental company has $540,000 to purchase up to 25 new cars of two different models. One model costs $18,000 each and the other model costs $24,000 each. Write a system of linear inequalities to describe the situation. Let x represent the first model

    asked by Tam on October 1, 2007
  83. Chemistry

    What is the molarity of the resulting saline solution when you mix 1 mole HCl with 1 mole NaOH? I'll provide some basic information that I know, but could somebody tell me how to get the answer using the data? The balanced reaction is as follows:

    asked by Andrew on March 8, 2008
  84. Math 1 question

    a.) Maddie works at a desighner store. She earns $1925 per month plus 10% commission of her sales. Write an equation to show how much she makes b.) one month she earned $2725. Use your equation to show what her sales were that month Please help, thanks :)

    asked by Olly on May 11, 2013
  85. English Q#2

    "Though I do hate him as I do hell-pains, Yet, for necessity of present life, I must show out a flag and sign of love, Which is indeed but sign." i don't know what this quote means this is what i think: "even though i hate him but for now i will show my

    asked by NeedHelp on November 19, 2010
  86. Math - Equation of Lines

    Determine whether the following pairs of planes are coincident, parallel and distinct or neither. a) x + 3y - z - 2 = 0 and 2x + 6y - 2z - 8 = 0 TEXTBOOK ANSWER: parallel and distinct Can someone show me how to find the vector equation or parametric

    asked by Anonymous on March 25, 2008
  87. chemistry

    An equilibrium mixture contains N2O4, (P= 0.30 ) and NO2 (P= 1.1 ) at 350 K. The volume of the container is doubled at constant temperature. Calculate the equilibrium pressure of when the system reaches a new equilibrium. Calculate the equilibrium pressure

    asked by Anonymous on May 20, 2010
  88. Physics

    Any ideal gas temperature may be written as T = Ti*r where Ti=temp at ice point and r = lim(P/Pi) at constant V. Show that the fractional error in T is dT/T = dr/r + 3.73 drs/rs where r s = lim(Ps/Pi) at constant V. Ps is pressure at steam and Pi is

    asked by Jane on February 3, 2010
  89. Physics

    Two equal-volume compartments of a box are joined by a thin wall as shown in the figure. The left compartment is filled with 0.050 mole of helium gas at 403 K, and the right compartment contains 0.025 mole of helium gas at 213 K. The right compartment also

    asked by Lyra on February 3, 2014
  90. math

    If A^TA is an invertible matrix, prove that the column vectors of A are linearly independent. You know that if statement X implies statement Y then that is equivalent to Not(Y) implies Not(X). You can start by taking the column vectors of to be linearly

    asked by mathstudent on January 8, 2007
  91. Chemistry

    How many half-lives have passed if 87.5% of a substance has decomposed? How many if 99.999% has decomposed? For 87.5% decomposition 1/8 is left. (1/8) = (1/2)^3 Three half lives is the answer Fot 99.999% decomposition, 10^-5 is left. Solve 10^-5 = (1/2)^n

    asked by John on November 25, 2006
  92. CHEMISTRY

    I am having a ton of trouble with this lab question, I do not understand it at all. The question is: Show how the rate of reaction in reciprocal seconds was calculated for the mixture in question 1, using the class average. The mixture in question one is:

    asked by blue fire on November 21, 2010
  93. chemistry

    I am having a ton of trouble with this lab question, I do not understand it at all. The question is: Show how the rate of reaction in reciprocal seconds was calculated for the mixture in question 1, using the class average. The mixture in question one is:

    asked by blue fire on November 21, 2010
  94. Research and Evaluation

    1) A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean. 2) The Fox TV network is considering replacing one of its

    asked by David M. on December 26, 2011
  95. Statistics

    1) A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean. 2) The Fox TV network is considering replacing one of its

    asked by McKenzie on July 11, 2012
  96. Chemistry

    For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?

    asked by D.C. on October 20, 2013
  97. Chemistry

    For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution? Thank you for the help!!

    asked by D.C. on October 20, 2013
  98. Chemistry

    10.0g of sodium chloride is dissoved in 300ml of 0.75mol/L magnesium chloride solution. Find the new concentration of chloride ions f the solution.

    asked by Emilee on December 13, 2012
  99. chemistry

    For the diprotic weak acid H2A, Ka1 = 2.8 × 10-6 and Ka2 = 5.8 × 10-9. What is the pH of a 0.0700 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?

    asked by ggigignune on September 19, 2018
  100. Chemistry

    10.0g of sodium chloride is dissoved in 300ml of 0.75mol/L magnesium chloride solution. Find the new concentration of chloride ions f the solution.

    asked by Emilee on December 13, 2012

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