# 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

91,718 questions, page 775
1. ## chemistry

You have a solution which contains an unknown concentration of an organic compound quinone O=CC4H4C=O and an unknown concentration of Pb2+ and Al3+. Explain how to determine the unknown concentrations of quinone, Pb2+ and Al3+.

asked by ct on June 6, 2015
2. ## Chemisty

A certain salt is known to have a solubility in water of 25.2g/100g water at 100°C and 11.4g/100g water at 20°C. The salt is dissolved in 240 g of water at 100°C until no more solid will dissolve. How much salt will crystallize out when the solution is

asked by love on January 19, 2012
3. ## algebra

An open-top box is to be constructed from a 6 foot by 8 foot rectangular cardboard by cutting out equal squares at each corner and the folding up the flaps. Let x denote the length of each side of the square to be cut out. 1. Find the function V that

4. ## Physics

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the

asked by Caleb on December 3, 2012
5. ## Maths

A quadrilateral is called cyclic if its corners lie on the circumference of a circle. An example is shown below left: the circle has radius 5 The area A of the quadrilateral for different x values is plotted on the right. It can be calculated that this

asked by Sam on February 2, 2017
6. ## physics

Early skeptics of the idea of a rotating Earth said that the fast spin of Earth would throw people at the equator into space. The radius of Earth is about 6400 km. Show why this objection is wrong by determining the following information. (a) Calculate the

asked by Danny on December 6, 2012

A man standing on a frictionless ice throws a boomerang which returns to him. Asuuming that the boomerang can only move in a a circular path, choose the correct statement: A)Since the momentum of the man-boomerang system is conserved, the man will ocme to

asked by Kurt on March 31, 2011

A man standing on a frictionless ice throws a boomerang which returns to him. Asuuming that the boomerang can only move in a a circular path, choose the correct statement: A)Since the momentum of the man-boomerang system is conserved, the man will ocme to

asked by Kurt on April 1, 2011
9. ## MATH

A Science instrutor assigns his student one second of home work..the first week of school,two seconds. the second week four seconds, the third.if the student asked whether he would agree to this weekly homework doubling for the duration of the 36-week

asked by MIKE on April 15, 2011
10. ## stats

how to work this math problemAn archaeologist has 250 animal bone fragments from prehistoric site -of these 195 are white-tail deer bones. Construct the 90% confidence interval for the percentage of bone fragments from this site that are from white-tail

asked by Donna on April 17, 2011
11. ## Chemistry

How does a cathode ray tube work? What I want to write: Energy is given to the cathode , thus allowing an energy beam to be crated between the positive charge on one end of the tube, and the negative charge on the other end. Can I add anymore? Also, would

asked by Anonymous on June 30, 2015
12. ## Physics

A moving 4.5 kg block collides with a horizontal spring whose spring constant is 226 N/m (see figure). The block compresses the spring a maximum distance of 8.0 cm from its rest position. The coefficient of kinetic friction between the block and the

asked by David on November 9, 2014
13. ## geometry

A Science instrutor assigns his student one second of home work..the first week of school,two seconds. the second week four seconds, the third.if the student asked whether he would agree to this weekly homework doubling for the duration of the 36-week

asked by MIKE11 on April 16, 2011
14. ## Maths/Algebra/Calculas

A square piece of paper 20cm by 20cm has equal sized squares cut from each corner, size x. What is the formula to work out the volume of this? Also what size squares cut at each corner would produce the largest volume open top box? Thanks for any help,

asked by Callum on May 21, 2014
15. ## Algebra

Hopelessly loss in New Joisey If Anyone can help me I greatly appericate it. Anyone know how do we find the greatest common factor of a polynomial? Can you give me an example, showing your work. 2.When finding the greatest common factor of a polynomial,

asked by JERSEYGIRL on December 6, 2011
16. ## math prob.

the purchasing director of a bank has just received a shipment of 100 printers. She has been told that the shipment includes 5 defective printers. She randomly selects two printers and tests them. If both printers work the purchasing director accepts the

asked by sha on July 25, 2010
17. ## MATH

A Science instrutor assigns his student one second of home work..the first week of school,two seconds. the second week four seconds, the third.if the student asked whether he would agree to this weekly homework doubling for the duration of the 36-week

asked by MIKE on April 15, 2011
18. ## Physics

One can work out by either lifting weights or using a tension band, which is like a big rubber band. If we model the rubber band as a big spring with spring constant 400 N/M how far in meters must I stretch the the band so it applies a force equivalent to

asked by Saiba on October 21, 2013
19. ## physics

A moving 1.6 kg block collides with a horizontal spring whose spring constant is 267 N/m (see figure). The block compresses the spring a maximum distance of 7.0 cm from its rest position. The coefficient of kinetic friction between the block and the

asked by anonymus on August 31, 2018
20. ## Maths

a) Express f(theta) = 4cos theta - 6sin theta in the form r cos(theta + alpha) b) Hence find the general solution of the equation 4cos theta - 6sin theta =5 c) Hence, find the minimum value of the function 1/4+f( theta)

asked by Becky on April 23, 2019
21. ## Geography

Which adaptions did early humans make during the last ice age in order to survive varied environments? Select all that apply. A. created religions to offer sacrifices to gods B. made shelters out of available materials C. worked in larger networks of

asked by annie on October 10, 2018
22. ## Busniess English - Negative and Persuasive Message

Which sentence presents an alternative in appropriate way? a. "The 11 a.m. flight is completely sold out, so I booked you on the 2 p.m. flight. Hopefully that will work for you." b. "We are out of the red units, so we went ahead and shipped you 12 green

asked by Amanda on May 31, 2012
23. ## Heat Transfer

A factory would like to produce plain carbon steel strips with pieces of polyethylene plastic ﬁlm bonded on them. The bonding operation will use a laser that is already available to provide a constant heat ﬂux of q′′0= 85, 000 W/m2for a speciﬁed

asked by Lauren on April 15, 2012
24. ## Algebra 1

Could you maybe walk me through this Algebra word problem? Here is the problem: Anita wants to put a moat around her rectangular castle. The castle is 45 ft by 60 ft. Let m be the width of the moat. 1. Write a polynomial that represents the total area of

asked by Ginny on February 22, 2014
25. ## Math

A person with no more than \$15,000 to invest plans to place the money in two investments. One investment is high-risk, high yield; the other is low risk, low yield. At least \$2,000 is to be placed in the high-risk investment. Furthermore, the amount

asked by BBF on April 2, 2009
26. ## Math 10 Linear Equations

Kevin opened a bank account and plans to deposit \$200 each month. Each time he makes a deposit, his parents have agreed to add 50% of the amount the family collects for returning cans and bottles. a) Write an equation that will show his monthly amount when

asked by Emily on April 19, 2012

carol FRIEND ESMERALDA IS AWAY FOR 3 DAYS.SHE ASKED CARLO TO FEED HER PET DOG TWICE A DAY.CARLO FEED HIM ONE 8-OUNCE CAN EVERY TIME HE GOES ESMERALDA'S HOUSE. HOW MANY CANS OF FOOD DOES ESMERALDA NEED TO BUY FOR THE THREE DAY VACATION? SHOW HOW YOU

asked by dk on January 3, 2011
28. ## Chemistry

Can someone help me with this question? Calculate the work for each of the following processes beginning with a gas sample in a piston assembly with T=305 K, P=1.79 atm, and V=4.29 (a) irreversible expensing against a constant external pressure of 1.00 atm

asked by Anonymous on April 3, 2015
29. ## medical terminology

I'm taking the medical terminology course and I'm at the part of the course that is working with ICD 9 CM codes. I'm in Chapter 2 of the Medical & Dental Associates, P.C. Insurance Forms Preparation work book and now I'm trying to do the exercises but I

asked by gabby on January 16, 2011
30. ## Algebra

Since Gottfried works a desk job as a lawyer, he likes to exercise on his lunch break. His wings get a workout when he flies to and from work, so he needs to exercise his legs. To do this, he runs around a circular track. If he can run 4 laps in 2 minutes,

asked by Math repost for Emily on April 10, 2019
31. ## Criminal Justice/Report Writing

If you approach your investigative work with an attitude of eliminating potential writing problems as they arise, you will be able to: A. write a report that has no negative investigative information. B. complete investigative responsibilities by finding

asked by Pat on November 2, 2014
32. ## chemistry-please check my work

Determine the mass of carbon monoxide that is produced when 45.6 g of methane CH4 react with 73.2 g of oxygen gas, O2. The products are CO and H2O. Please check my work: CH4 + 3O2 ---> 2CO + 2H20 nCH4=2.84 mol nO2=4.58 mol Limiting Reactant: 1 mol CH4/2.84

asked by Sarah H on May 23, 2008
33. ## ENGLISH

Please correct me if I'm wrong on any of this thanks! From the words below supply the words that complete the sentences. Capitulate, Caustic, Hierarchy, Iconoclast, Placid. A. While he enjoyed the work, the rigid HIERARCHY in the company meant his

asked by Anonymous on April 5, 2014

"Y912f", please give the follow note to your parents. Dear Parents of Y912f, Your daughter has been receiving help from Jiskha for quite some time. Our task on this site is to "help" students learn, not do their work for them. It has become obvious that

asked by GuruBlue on May 16, 2010
35. ## WD PowerPoint (Duties)

Okay i'm wondering if anyone is able to help me summarize the most important duties and responsibilities of a a "Web Designer". I need it for my powerpoint. Here is the info I have gathered. - Liaising closely with a customer or client at the design stage

asked by Larry on January 10, 2009
36. ## WD Powerpoint

Okay i'm wondering if anyone is able to help me summarize the most important duties and responsibilities of a a "Web Designer". I need it for my powerpoint. Here is the info I have gathered. - Liaising closely with a customer or client at the design stage

asked by Larry on January 10, 2009
37. ## Math

I think I have my answer but I still need help Daniellewillusetheinstructionsintheboxbelow to make a cleaning solution. Add 13 cups of water to every 2 cups of concentrated cleaner. Which of the following proportions can be used to ﬁnd w , the number of

asked by Ben on March 26, 2018
38. ## chemistry

1. What mass of lead chloride (PbCl2, MW= 278.2; Ksp= 1.8 x 10^-10) is dissolved in 250 mL of a saturated solution? 2. What mass lead chloride (PbCl2, MW=278.2; Ksp=1.8 x 10^-10) will dissolve in 150 mL of 0.050 M Pb(NO3)2?

asked by lindsey on July 31, 2010
39. ## phsyics

A traveler takes a trip with a reluctant pack mule. He finds that he has to exert a constant 470 N horizontal force on the mule to keep the mule moving at a constant speed of 0.9 m/s for a distance of 1.8 km across a horizontal plane. Compute the amount of

asked by Austin on November 1, 2011
40. ## phsyics

A traveler takes a trip with a reluctant pack mule. He finds that he has to exert a constant 470 N horizontal force on the mule to keep the mule moving at a constant speed of 0.9 m/s for a distance of 1.8 km across a horizontal plane. Compute the amount of

asked by Austin on November 1, 2011
41. ## phsyics

A traveler takes a trip with a reluctant pack mule. He finds that he has to exert a constant 470 N horizontal force on the mule to keep the mule moving at a constant speed of 0.9 m/s for a distance of 1.8 km across a horizontal plane. Compute the amount of

asked by Austin on November 1, 2011
42. ## Calculus

Check my work? The equations given were R(x)=-x^2+400x and C(x)=x^2+40x+100. We were asked to find the maximum profit and minimum average cost. (I'm having trouble remembering how to find a minimum and maximum, so please help with that, if you can!) For

asked by Lindsay on December 7, 2013
43. ## algebra

A Science instrutor assigns his student one second of home work..the first week of school,two seconds. the second week four seconds, the third.if the student asked whether he would agree to this weekly homework doubling for the duration of the 36-week

asked by MIKE11 on April 16, 2011
44. ## Child Care

Two-year-old Gerld is starting at your day care center tomorrow. His mother is going back to work for the first time since Gerald was born. You have four groups at the center. In which group should you place Gerald? A. A group of six toddlers. B. A grouop

asked by Ann on February 13, 2009
45. ## Physics

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.5× 104 kg, and the force causes its speed to change from 7000 to 5000m/s. (a) What is the work done by the

asked by Elle on April 4, 2014
46. ## math

please help! You are paid \$7.45/hr at your part-time job. Your deductions are FICA (7.65%), federal tax withholding (10.65%), and state tax withholding (5.7%). Your travel expenses are \$5.70 per day worked. You work 12 hours over a 3-day period of time.

asked by Cindy on April 9, 2012
47. ## Language Arts HEL;P!

Which of the following best describes the effect of beginning "Always to Remember" with a description of the memorial competition? A. This technique keeps the essay from being autobiography or fiction. B. This tatic gives background for the importance of

asked by Anonymous on October 23, 2014
48. ## Math

John says to Brenda, "if you give me eight dollars, we will have an equal amount of money." Brenda responds, "but if you give me eight dollars, I will have twice as much money as you." How much money did Brenda and John each have? Need to show how you did

asked by Caitlin on November 27, 2007
49. ## English

Writacher, I urgently need you to check these sentences. Thank you very much. 1.The new teacher arrives on Tuesday for his first lesson. 2.We are meeting our friends in the square at 3 o’clock and then we are going to the disco together. 3.Tomorrow it

asked by Matthew on April 17, 2012
50. ## English

Bret Harte "Plain Language from Truthful James" 1. What was the major theme in this poem? 2. What can we learn from the characters in the poem about the people of this time period. 3. What lesson can be learned from the plot if this poem. 4. What message

asked by Anonymous on February 22, 2013
51. ## Calc, Implicit Differentiation

1) Let x^3 + y^3 = 28. Find y"(x) at the point (3, 1). y"(3)= The correct answer is: -2*3*28 = -168 3x^2 + 3y^2(dx/dy) = 0 6x + 6y(dx/dy) = 0 dx/dy = -6(3)/6(1) = -3 That's as far as i get... i don't even know if that's started right... You have x^3 + +

asked by Michael on October 21, 2006
52. ## History

magine you work in a steel mill in a large industrial city in England in the late 1800s. You live in a neighborhood with other factory workers, and share the same living and working conditions they do. Write a letter to your representative in Parliament

asked by Jessica on March 16, 2016
53. ## Social Studies

Does anyone what this answer: Southeast Asia at Work Test 1. Place the countries in the most fully democratic (top) to the least (bottom) democratic order. 2. Top Indonesia and the Philippines 3. Thailand and Myanmar 4. Vietname and laos Economic Activity

asked by Mary on May 13, 2019
54. ## Anatomy & Physiology

How do the gas laws (Daltons, Boyles and Henrys)apply to the respiratory processes? I will be happy to critique your thinking on this. I know Dalton's Law is the law of partial pressures, Boyle's law is the law for a fixed mass of ideal gas at fixed

asked by Aletha on March 21, 2007

A certain CD has a playing time of 80 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 x 10^2 revolutions per minute (rpm). At the end of the music, the CD is rotating at 2.1 x 10^2 rpm. Find the magnitude of the average

asked by Mary on March 14, 2007
56. ## English Research Paper *Edit*

What does everyone think of these questions: What are the positive effects music has on the mind? Can those positive effects change a mindset on something / the way you think? Can music calm the mind? After a bad day, or even deescalate a situation. How

asked by D on May 24, 2018
57. ## Social Studies

What did Frederick Douglass, and Andrew Jackson say about their hopes for the future of the United States? How did they each work to help change the United States? How did they each react to key events happening in the United States? Were there any key

asked by Aria on May 16, 2016
58. ## Math

1.A job hotline service charges \$25 plus a 4% commission c on the first month of earnings if it finds work for a client. Write an equation that represents the total cost T to find a job through the hotline. What is the cost if a client earns \$1500 the

59. ## Math

How would you work this problem? The odometer of the family car read 15951 when the driver noticed that the number was palindromic. "Curious," said the driver. "It will be a long time before that happens again." But two hours later, the odometer showed a

asked by Anonymous on November 6, 2007
60. ## Physics

A mass of 2.63 kg is attached to a string tied to a hook in the ceiling. The length of the string, L, is 0.8 m, and the mass is released from rest at an initial position in which the string makes an angle θ of 40.4o with the vertical. Calculate the work

asked by Anonymous on October 21, 2014
61. ## Physics

Problem 22.16 A 7.5 v battery supplies a 3.5 mA current to a circuit for 8.2 Hr . Part A - How much charge has been transferred from the negative to the positive terminal? Express your answer using two significant figures. Part B - How much work has been

asked by Paige on September 25, 2011
62. ## Physics

A roller coaster with a mass of 500.0 kg starts from a height of 27.0 meters with a speed of 5.1 m/s. It descends to a height of 2.00 meters before it starts back up. Some energy is loss to the work due to friction. The speed at the bottom of the ramp is

asked by mssailormouth on June 18, 2019
63. ## Algbrea

sapphire island is open 7 days a week the park has 8 ticket booth and each booth has a ticket seller from 10:00 AM to 5:00 PM on average ticket sellers work 30 hours per week write an equation that can be used to find t the minimum number of ticket sellers

asked by Sarah on August 30, 2015
64. ## Physics

An ice skater of mass (on frictionless ice) fires a bullet of mass 10 grams that leaves the barrel at 500 m/s (in the x-direction relative to the ground) A) what is the recoil velocity of the skater relative to the ground? B) how much work is done in the

asked by Fullmetal on March 2, 2016
65. ## Math

A game show has three doors labelled A,B, and C behind which there may or may not be a prize. A group of contestants are asked behind which doors they think there is a prize. The results are that 18 people choose A, 19 people choose B, 19 people choose C,

asked by Rose on February 23, 2016
66. ## earth science

Science fair help..about soil.. and UV rays..? my topic is how can natural or artificial UV (ultraviolet rays) affect the humus soil and also the grass growing in it? I took 5 plants and put it near the window and the other ones i put it near an artificial

asked by s on May 11, 2009
67. ## Genetics

Hi, I really need help in how to approach this question: A species of tiny antelope, known as the zephyr, has an XY system of sex determination, similar to mammals. Zephyr males have small antlers and females do not. The antlers can be two pronged (2-pr)

asked by Steven on February 6, 2011
68. ## Physics

I just need to know how to start this equation because it makes no sense The position of a particle is given by r = (6.0 cos 3.0 t i + 6.0 sin 3.0 t j) meters. Determine (a) the velocity vector, v, and (b) the acceleartion vector, a. (c) What is the parth

asked by QUESTION on August 20, 2009
69. ## Chemistry 2

A mixture containing KCLO3, K2CO3, KHCO3, and KCL was heated, producing CO2, O2, and H2O (water) gases according following equations: 2KCLO3 -> 2KCL + O2 2KHCO3 -> K2O + H2O + 2CO2 2CO3 -> K2O + CO2 The KCL does not reacnder the conditions of the reaction.

asked by Pat on September 13, 2007
70. ## Physics

An electron is a subatomic particle (m = 9.11 *10^-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.31 * 10^5 m/s to a final velocity of +2.21 * 10^6 m/s while traveling a distance

asked by Gerald on September 20, 2010
71. ## physics

A mass with an initial combined potential energy and kinetic energy of 10,000 joules is dropped onto a fence post to drive it into the ground. The post is driven 0.25 meters into the ground before it comes to rest with the mass sitting on top of the post.

asked by Charles on January 24, 2012
72. ## Economics

Read the scenario. Jorge lives in a country that uses a progressive tax system in which his taxable income is taxed at a specific percentage. In 2016, Jorge made \$90,000 and was taxed at 25 percent. He is due for a \$5,000 raise in 2017. At that time, his

asked by Bri on April 24, 2019
73. ## Program Design and Developmen

Design a class named TextBook that is a child class of Book. Include a new data field for the grade level of the book and get and set methods for the new field. Provide the pseudocode for the TextBook class Very basic pseudo code is what we're dealing

asked by alex on April 8, 2017
74. ## Math

I don't understand this question can someone explain? For the data listed, select a type of display and describe the steps that you would take in developing it to show the relationship between age and deaths/ 100 people from car accidents: Age 1-14= a

asked by B.B. on July 30, 2009
75. ## accounting

The following are the transaction of s company will in branch for 2(two) year they follow periodic inventory system. 1. Beginning inventory balance with in birr 10000 2. S company shipped merchandise is birr costing 80000 cash 20000 3. Birr sold

asked by medu on May 24, 2017
76. ## History

Ms. Sue please help! 3. Read the passage and answer the question that follows: Many slaves preferred not to escape their horrible lives on plantations because their families were often with them. Despite the fact that slaves had no rights, they often found

asked by Austin on June 1, 2014

Both writers make valid points in their essays regarding moral decline. Robert H Bork points out in his essay, Modern Liberalism and American Decline, that the morals and values have decreased in America due to the increase or movement towards modern

asked by Amy on February 16, 2009

The picture is of a woman's head sculpted out of clay,her hair is red also her eyebrows,freckles, and lips. Her eye's are blue with black outlining her nose is sculpted out and lips open.What is one characteristic of this student's work? A.creation of 3-D

asked by Callie on November 25, 2014
79. ## English Lit- Judith Wright

Does anyone have any information/websites on the poem 'Mirror at the Fun Fair' by Australian poet Judith Wright? Or info on any of her poems. Thanks!

asked by Brian on February 19, 2007
80. ## Coding

Patient presents to the ER with severe nosebleeds for the past week. Blood work is performed revealing acute blood loss anemia. The ER doctor performs a limited, bilateral packing of the anterior nasal cavity. Patient's anemia will be following by her

asked by Kerry on August 16, 2015
81. ## College Algebra

Charlie can grade exams in 2 hours. It takes Mark 6 hours to grade the same exams. If they work together, how long will it take for them to grade the exams?

asked by Devin on March 30, 2011
82. ## Math

Joey can plow a field alone for in four hours. It takes Luigi five hours to plow the same field alone. If they work together, how long will it take them to plow the the field?

asked by Yakima on February 17, 2012
83. ## Psychology

Describe what successful aging means to you by identifying at least 3 characteristics of successful aging that you have met. What characteristics of successful aging do you need to work on?

asked by Jessica on November 8, 2018
84. ## Algebra

jose can complete the job in a hours, and Maria can complete the job in b hours. How long does it take them to complete the job when they work together? I need a formula

asked by Brian on April 16, 2009
85. ## ALGEBRA

Jose can paint a house in 10 days and peter can paint the same house in 12 days. How long will it take to paint the house if both men work?

asked by SHAIRA on October 6, 2014
86. ## Math

Shawn earns \$3.50 per hour for the first 40 hours worked in a week and \$20.25 per week, for hours over 40. If he earns \$661.50 in one week, how many hours did he work?

asked by Anonymous on March 17, 2016
87. ## math

trey can clean a room in 40 minutes. his brother Marcus can clean the same room in 20 minutes. how long will it take them to clean the room if they work together?

asked by jj on October 10, 2016
88. ## Math - Vectors

If "u = (2,2,-1)", "v = (3,-1,0)" and "w = (1,7,8)", verify that "u (dot) (v + w) = u (dot) v + u (dot) w". My work: LHS: u (dot) (v + w) = (2,2,-1) (dot) (4,6,8) = [(2,2,-1) (dot) (3,-1,0)] + [(2,2,-1) (dot) (1,7,8)] = [u (dot) v] + [u (dot) w] Therefore,

asked by Anonymous on February 26, 2008
89. ## Chemistry

How might one separate a mixture of water and salt? A solution of water and salt may be separated, if you don't want the water, by allowing the water to evaporate which will leave the salt crystals behind. If you want the water AND the salt, you may

asked by Dave on September 9, 2006
90. ## phys urgent!

A particle leaves the origin with a speed of 2.4 times 10^6 m/s at 38 degrees to the positive x axis. It moves in a uniform electric field directed along positive y axis. Find Ey such that the particle will cross the x axis at x = 1.5 cm if the particle is

asked by kenzie on September 2, 2014
91. ## Chemistry

Hey there! I have these two questions for my chemistry class, and I am a little confused on how I should go about solving them. If someone could give me the steps necessary to solve these problems I would be most appreciative. 1.) p-Toluenesulfinic acid

asked by Ka_Chin on February 14, 2016
92. ## Chemistry

At the beginning of a titration to standardize the NaOH solution, Student A adjusted very carefully the initial burette volume to 0.00 mL, but he did not notice an important air bubble in the tip of the burette. At the end of the titration, the air bubble

asked by kobe on February 9, 2015
93. ## chemistry please step by step for me

what volume of hcl solution of density 1.2g/cm3 and containing 36.5% by weight hcl, must be allowed to react with zinc in order to liberate 4g of hydrogen I know this calculate this part, but I do not get the answer 333.3ml 1.2g/ml x 1000 x 0.365/36.5 =

asked by ken on July 4, 2014
94. ## chem

Balance the equation and answer in terms of moles. Chlorine gas can be produced commercially by passing an electric current through a con-centrated solution of sodium chloride (brine). The unbalanced equation is NaCl(aq) + H2O(`) ! NaOH(aq) + Cl2(g) +

asked by jack on February 15, 2012
95. ## math

Make a model of a rectangular prism that is not a cube and has a surface area of 62 cm squared. What are the measurements of this rectangular prism? I know the formula, is 2ab+2bc+2ac=sa, and I know the answer to this problem... a=5, b=3, and c=2... I did

asked by Elie on May 7, 2012
96. ## Chemistry

What is the function of a salt bridge in a galvanic cell? 1. To permit electrons to flow through the solution. 2. To maintain a steady flow of reactants from the cathode to the anode. 3. To form complex ions with the products of oxidation at the anode. 4.

asked by Anonymous on November 18, 2015
97. ## Physics

Why does a piece of iron behave like a temporary magnet when placed in a magnetic field? SOLUTION: Iron consists of many small magnetic domains which all line up and temporarily behave like an ordinary magnet when iron is placed in an external magnetic

asked by sally on May 27, 2009
98. ## Chemistry

Consider a weak acid-strong base titration in which 25.0 mL of 0.100 M acetic acid is titrated with 0.100 M NaOH. a) Calculate the pH after the addition of 3.00mL of NaOH. b) What is the pH of the solution before the addition of NaOH (pKa of acetic

asked by Jon on February 27, 2011
99. ## Chemistry

Each of the following processes is spontaneous as described. Which one will have ∆H approximately equal to zero? 1. precipitating 1 mol of AgBr(s) from a solution of Ag+(aq) and Br−(aq) 2. 1 L He(1 atm, 298 K) + 1 L Ar(1 atm, 298 K) → 2 L He/Ar

asked by Mary on March 1, 2012
100. ## Chem

What is the pH of the resulting solution if 30.00 mL of 0.100M acetic acid is added to 10.00mL of 0.100 M NaOH? For acetic acid, Ka=0.000018. I know that NaOH is a strong base and acetic acid is a weak acid. What is the equation: C6H5COOH+NaOH C6H5COOH

asked by Sarah on February 27, 2008