# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,330 questions, page 203-
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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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