# 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 619
1. ## science

14. the sun's layer is called the photosphere . ( 1point) A. true b. false 15. meteoroids can form when comets break apart , creating dust clouds . ( 1point ) A. true b. false 16. a star is born whenever a nebula expands . ( 1point ) A. true b. false 17. a

asked by Help me,plz on March 13, 2015
2. ## accounting

This year , Kirby company sold 35,000 units of production at \$16 per unit. Maunfactoring and selling the product required \$120,000 of mixed manufacturing costs and \$180,000 of fixed selling and administrative expenses. This years variable costs and

asked by damara on August 22, 2007
3. ## College Physics

When searching for gold, measurements of g can be used find regions within the Earth where the density is larger than that of normal soil. Such measurements can also be used to find regions in which the density of the Earth is smaller than normal soil;

asked by Please Help!!! on September 21, 2011
4. ## Health--Check my answers

1. The best way to describe fitness is: being slim and low in body fat being big, strong, and “buffed” being flexible and having a sense of overall well-being *** all of the above 2. The best way to describe wellness is: making positive choices ***

asked by Anonymous on September 21, 2014
5. ## Government

Suppose major officeholders from one particular party are not performing well, and this party is not monitoring these officeholders. In what ways could this situation affect the party as a whole? In the United States, the popularity of the poorly

asked by Nichole on May 13, 2007
6. ## English

The High School Step Team Karla’s cousin Jade urged her to join the step team. “This afternoon you should definitely try out!” Jade suggested after the final bell rang. “I know she wants the best for me,” Karla thought to herself, “but I’m

asked by Kaai97 on November 19, 2015
7. ## Calculus - Hydrostatic Pressure

Please check my work: Find the hydrostatic pressure on one end of a water trough full of water, the end of which is a trapezoid with given dimensions: top of trapezoid = 20 feet, sides of trapezoid both = 8 feet, bottom of trapezoid = 12 feet. Depth of

asked by COFFEE on June 26, 2007
8. ## chemistry HELP

Use the following information to identify element A and compound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has been filled with nitrogen gas at a pressure of 790. torr and a

asked by sonya on October 29, 2006
9. ## economics

If a country such as Europe sells their saved dollars as a result in a drop in U.S. sales and purchases, will the demand-supply graph show only the demand for the dollar. I just don't understand what the demand-supply graph suppose to illustrate. Help.

asked by Rm on April 16, 2008
10. ## MATH

A theater has a seating capacity of 1050 and charges \$5 for children, \$7 for students, and \$9 for adults. At a certain screening with full attendance, there were half as many adults as children and students combined. The receipts totaled \$7650. How many

asked by Anonymous on June 14, 2017
11. ## Physics

A ball of mass m makes a head-on elastic collison with a second ball (at rest) and rebounds in the opposite direction with a speed equal to 1/4 it's original speed. What is the mass of the second ball? I would really apprieciate it if ya'll would show

asked by Henry on November 9, 2012
12. ## 5TH GRADE MATH

John placed 128 beads in equal rows to make an art project. His friend Mark used 125 beads to make a similar project. Is it possible for their projects to contain the same number of beads in a row? Please show and explain the answer.

asked by Stephon on November 24, 2013
13. ## Relativity

A particle called neutral pi meson (or pion) decays into two photons and nothing else. If the pion (whose rest mass is 135Mev) is initially at rest (a) what are the energies of the photons? (b)what are the magnitudes of the momenta of the photons? (c) How

asked by Deforest on June 7, 2011
14. ## physical science

A car starts from rest and accelerates uniformly along a straight horizontal road at 3 metres second squeared for 4 seconds.CALCULATE THE MAGNITUDE OF THE MAXIMUM VELOCITY OF THE CAR,I.E THE VELOCITY OF THE CAR AFTER ACCELERATING FOR 4 SECONDS.PLEASE SHOW

asked by Anonymous on September 3, 2011
15. ## physics

A basketball explodes into three separate pieces. Two pieces of equal mass shoot off at 20.3 m/s, one travelling to the south and one to the west, perpendicular to each other. The third piece has a mass 4 times the size of one of the other pieces. What is

asked by HELP!!! on November 15, 2016
16. ## PHYSICS

A mass is thrown upwards with an initial velocity of 30m/s. A second mass is dropped from directly above, a height of 60m from the first mass 0.50s later. When do the masses meet and how hight is the point where they meet? I NEED TO KNOW HOW TO SHOW THIS

asked by B on October 11, 2009
17. ## Education/Technology

If a teacher wants his or her students to create a slide show that features digital pictures of students demonstrating projects the students have completed, the best software to use would be: A) Presentation software. B) Spreadsheet software. C) Database

asked by Lor on February 7, 2013
18. ## Math: Need Answer to study for a quizz. Help ASAP

Estimate the area under the curve f(x)=x^2-4x+5 on [1,3]. Darw the graph and the midpoint rectangles using 8 partitions. Show how to calculate the estimated area by finding the sum of areas of the rectangles. Find the actual area under the curve on [1,3]

asked by Jesse on November 18, 2010
19. ## math homework

two boats A and B left a port C at the same time on different routes. B travelled on a bearing of 150 and A travelled on the north side of B. When A had travelled 8km and the two boats was found to be 12km. Calculate the bearing of A route from C. Show

asked by Christiana on May 18, 2017
20. ## physics

during a water show the dolphin made a vertical jump of 2.5 m. Determine: a. The initial velocity they need to make that jump. b. the time it takes the dolphin to reach the maximum height. The total time the dolphin remains in the air.

asked by daniela on October 7, 2012
21. ## organic chemistry

1. A chemist conducted a recrystallization on 18.5 g of a solid and collected 11.2 g as a first crop. She re-cooled the mother liquor and obtained 2.1 g as a second crop. Show your calculation when answering the following questions: (a) What is the percent

asked by Parm on October 6, 2017
22. ## math

Not to sure of how to make reasonable graph for this question. A car was purchased new in 1970. The owner has taken excellent care of the car, and it has realtivly low miles. Draw a resonable graph to show the value of the car from the time it was

asked by rodrick on September 8, 2009
23. ## Chemistry

I have a question about incomplete combustions. I think that you can have carbon monoxide, carbon dioxide, water and carbon or some combination of these in the products of incomplete combustions. Is this right? For Pentane, would it be correct to show one

asked by Anne on October 7, 2009
24. ## 8th Grade Algebra-Answer Check

Write each decimal as a fraction in lowest terms. 1. 0.111... Answer: 1/9 2. 0.02 Answer: 1/50 3. 0.7272... Answer: 8/11 4. 0.012012... Answer: 4/333 ?? 5. 0.66666.... Answer: 2/3 6. 0.396 (reapeating sign over all numbers) Answer: 44/111 ??? If I got any

asked by Joy on January 19, 2009
25. ## Finite math

A theater has a seating capacity of 900 and charges \$5 for children, \$7 for students, and \$9 for adults. At a certain screening with full attendance, there were half as many adults as children and students combined. The receipts totaled \$6100. How many

asked by IU on January 22, 2017
26. ## Physics

A drawbridge with a weight of 5000 N is supported by a hinge and rope and is in static equilibrium. The length of the drawbridge is 5 m and the rope is attached to the draw bridge a distance of 4 m from the hinge. What is the tension force rope provides?

asked by Mike on April 24, 2013
27. ## relativity

A particle called neutral pi meson (or pion) decays into two photons and nothing else. If the pion is initially at rest (rest mass 135Mev). (a) what are the energies of the photons ? (b) What are the magnitudes of the momenta of the photons (c) How are

asked by wally on June 8, 2011
28. ## Straight Lines

From each corner of a parallelogram a perpendicular is drawn upon the diagonal which does not pass through that corner and these are produced to form another parallelogram, show that its diagonals are perpendicular to the sides of the first parallelogram

asked by Kewal on January 21, 2012
29. ## Math

Joseph is going to see his favorite sports team play and wants to show his team spirit. He has 4 different jerseys and 6 different hats depicting his team. How many different combinations of jerseys and hats does he have to choose from?

asked by bubbie on May 7, 2013
30. ## math

al has twice as many baseball cards as frank and four times as many football cards as joe. the expression 2x+4y can be used to show the total number of baseball and football cards Al has. If the answer is y, then what is the question?

asked by Grace on August 17, 2012
31. ## Calculus Help Please!!!

In a murder investigation, the temperature of the corpse was 32.5 C at 1:30pm and 30.3 C an hour later. Normal body temperature is 37.0 C and the temperature of the surrounding was 20.0 C. When did the murder take place? PLEASE SHOW STEP BY STEP

asked by Tanya on March 27, 2014
32. ## fractions

If a scaled building is 672ft in real life, and you need to scale it to 1/320th size, how tall would it be if 1ft real size = 1inch scaled size? Please show how this done

asked by Anonymous on June 1, 2012
33. ## Remy

triangle AOB is a right angled triangle....(1.5, 2)is the midpoint co-ordinate of AB the co-ordinate of B is (2.5. 0)... Find the height of point A reached by the the top of the triangle... Could you show this step-by step please?

asked by Maths URGENT on September 28, 2009
34. ## Physics-mechanics

Two spheres are placed so that their centers are 2.6 m apart. The force between the two spheres is 2.75 x 10^-12 N. What is the mass of each sphere if one sphere is twice the mass of the other sphere?(please use all the correct formula, and show all

asked by Rebecca on December 27, 2012
35. ## Algebra

Show that the distance between the points (x,y) and the line Ax + By + C = 0 is: D = (Ax + By + C) / sqrt(A^2 + B^2) So, would you start out by multiplying sqrt (A^2 + B^2) to both sides and then it would become: sqrt (A^2 + B^2)D = Ax + By + C Then square

asked by Zach on September 8, 2008
36. ## Remy

triangle AOB is a right angled triangle....(1.5, 2)is the midpoint co-ordinate of AB the co-ordinate of B is (2.5. 0)... Find the height of point A reached by the the top of the triangle... Could you show this step-by step please?

asked by Maths URGENT on September 28, 2009
37. ## Calculus

Consider the closed curve in the day plane: 2x^2-2xy+y^3=14 a) show that dy/dx=2y-4x/3y^2-2x (I got this part) b) find equation lines to the curve when y=2 c) if the point (2.5, k) is on the curve, use part b to find the best approximation of the value of

asked by Marie on October 20, 2014
38. ## Trig/Pre-Cal

Show that the distance between the points (x,y) and the line Ax + By + C = 0 is: D = (Ax + By + C) / sqrt(A^2 + B^2) So, would you start out by multiplying sqrt (A^2 + B^2) to both sides and then it would become: sqrt (A^2 + B^2)D = Ax + By + C Then square

asked by Alton on September 7, 2008
39. ## Calculus

What does lim x-->∞ f(x)/g(x)=0 show? a) g(x) grows faster than f(x) as x goes to infinity b) f(g) and g(x) grow at the same rate as x goes to infinity c) f(x) grows faster than g(x) as x goes to infinity d) LHopital's Rule must be used to determine the

asked by Alice on March 14, 2019
40. ## maths

The level of oil in a bottle is at the 1/2-mark. More oil is poured in until it is at the 7/8- mark. What fraction of the bottle is occupied by the additional amount of oil. Pls show all working.

asked by Michael on November 16, 2016
41. ## Math

1. Find the sum of the first five terms of the sequence 2/3, 2, 6, 18, ..... 2. Is this a geometric sequence? 2x, (4x-2), (6x-4), ..... 3. Show the equivalent values of the decimal 0.7575757575..... in fraction form. 4. What is the sum of the geometric

asked by Brianna on October 16, 2014
42. ## Math

I'm doing some practice questions for my Complex Numbers unit and I'm confused on how to get the answer for this problem: (Radical -50x^2y^2) My answer guide says that the answer is 5i |xy| (Radical 2) Could someone please show me how to do the problem?

asked by Maia on March 15, 2019
43. ## Chamistry

I am currently doing a lab write up and i have a little problem with some ionic equations the question goes as follows: You are provided with aqueous solutions of CaCl2, AlCl3, ZnCl2, CuCl2, FeCl2 and FeCl3 in six separate test tubes. To each of the

asked by Marysia on October 29, 2008
44. ## Chemistry

I am currently doing a lab write up and i have a little problem with some ionic equations the question goes as follows: You are provided with aqueous solutions of CaCl2, AlCl3, ZnCl2, CuCl2, FeCl2 and FeCl3 in six separate test tubes. To each of the

asked by Marysia on October 29, 2008
45. ## Finance/Cost accounting

The XYZ Corporation is contemplating the introduction of a new machine tool which will be used solely in the manufacture of a rotor shaft. 50,000 units per year are expected to be manufactured, and the time study group anticpates a standard of 2.5 hours

asked by Cheryl on April 1, 2011
46. ## Algebra 1

Jillian wants to buy candles for winter, in case her electricity and furnace fail. Each candle she plans to use, burns at a rate of 5 mL of was per 15 cm. How many HOURS will it take the candle to burn down completely? Express the answer to the NEAREST

asked by Elizabeth on January 17, 2008
47. ## Data structure

Q1. Write a menu driven program for checkout lines in a supermarket, Using Queue data structure and Queue Simulation concepts. Create varied lines of servers depending on the user input initially. Display the queue of each server along with the customers

asked by Pintu on August 17, 2014
48. ## English(Reed)

Same post, another question :) If propaganda is analogous to soma(body para 1), then what should I establish for the two other examples in my essay? Would the total control of the citizens' genetic, economic, social, and sexual freedoms be analogous to

asked by Beth on May 29, 2015
49. ## Grade 12 Advanced Functions

The length of a child's square-based jewelry box is 5cm more than its height. The box has a capacity of 500cm^3. Solve a polynomial equation to determine the dimensions of the box.

asked by Zara on April 29, 2017
50. ## algebra

Solve the quadratic equation: 2x(squared)+6x+12=0 I know you have to find two numbers that =24 (2 times 12) and have a sum of 6. But I can't think of any! Can someone please help? Use the quadratic. And this problem has no real answers, they are imaginary.

asked by Sir Galahad on December 9, 2006
51. ## Science

The skydiver has fries and a milk shake. Whay is he so nervous? Because he is???????? 4 words total.. The 1st and 2nd are 2 letters. The 3rd and 4th are 3 letters. Using these letters to solve UTAHNIIEUR

asked by Randon Sharp on March 7, 2011
52. ## college algebra

Please help. Merina is moving out of her mom's house to her new house which is 14 miles away to reach her new house. Truck A offers a flat fee of \$25 and \$.40 per mile. What is the proper equation to solve the problem.

asked by Nima on September 12, 2013
53. ## Physics Help2I!!!

There are six books in a stack, and each book weighs 5N. The coefficient of friction between the books is 0.2. With what horizontal force must one push to start sliding the top five books off the bottom one? I got 7N, but i think it is wrong. How can I

asked by @-@ on October 26, 2008
54. ## physics

A car drives around a curve with radius 390 m at a speed of 32 m/s. The road is not banked. The mass of the car is 1200 kg. (a) What is the frictional force on the car? N c) Explain I really don't know how to solve this could someone please help me out on

asked by Julia on May 25, 2012
55. ## Algebra

I posted this earlier but it didn't get answered. So I'm posting it again with hopes that, this time, it will be answered. Please solve for x: |x-6|>7 I got x=6 as a final answer, but that doesn't make sense because 6 is not greater than 7. Please help!!

asked by Marie on April 17, 2012
56. ## Math

I don't know how to solve this math problem? A call center is 120 yd. long and 40 yd. wide. Each employee requires 30 sq. ft. if the center needs to have 40% of open space, how many employees can be seated in the center?

asked by Paula on October 9, 2011
57. ## Accounting

The Divine Merchandising Corporation began March operations with merchandise inventory of 6 units, each of which cost \$27. During March, Divine Merchandising made the following purchases: (1) March 4, 12 units @ \$28 per unit, (2) March 15, 18 units @ \$30

asked by Kai on April 8, 2013
58. ## Physics

The system of blocks of masses m1=3kg and m2 = 1.80 kg are connected by a string as shown. Mass m rests on a rough surface of unknown coefficient of kinetic friction. After the masses are released, they move with an acceleration of 2.80 m/s^2 (m1 moves to

asked by Matt on February 20, 2007
59. ## geometry

In order to properly design a heating system for a greenhouse, the volume of air in the building needs to be determined. Find the volume of air in the greenhouse below. The length of the building is 40 feet long, the width is 20 feet long, and it is 8 feet

asked by Asics on September 24, 2014
60. ## geometry

4. In order to properly design a heating system for a greenhouse, the volume of air in the building needs to be determined. Find the volume of air in the greenhouse below. The length of the building is 40 feet long, the width is 20 feet long, and it is 8

asked by Scott on March 1, 2013
61. ## math

Kyle and Andrew decide to make some money by raking leaves in their neighborhood. The houses in their neighborhood each have half acre lawns. Kyle and Andrew each start by raking the leaves from their own yards. Kyle realizes it takes him 3 hours to rake

asked by Andrew on September 30, 2016
62. ## physics

A uniform, 264-N rod that is 2.05 m long carries a 225-N weight at its right end and an unknown weight W toward the left end. When W is placed 47.9 cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 82.7 cm

asked by Matt on April 2, 2013
63. ## CHEMISTRY

We have this following gas equilibrium : H2 + Cl2 2HCl + 184 kJ then predict the following to know Le chatlier's prediction 1) adding Cl2 2) removing HCl 3) elevation of pressure 4) lowering of the temperature 5) removing H2 and lowering pressure 6) adding

asked by MAD on July 7, 2014
64. ## Chemistry

Two moles of pure ammonia were injected into a 2.00L flask at a certain temperature. The equilibrium mixture: 2NH3(G)-->N2(G) + 3H2(G)

asked by Jimmy on May 17, 2009
65. ## socialstudies help

please answer these already?? 1.The Aztecs adapted to their environment mainly by A.using terracing and irrigation to farm. B.living a nomadic hunter-gatherer lifestyle. C.trading peacefully with neighbors. D.settling along the coasts where they could

asked by Matt on January 23, 2014
66. ## Language Arts

from "Harriet Tubman: Conductor on the Underground Railroad" by Ann Petry. 1 That first winter in St. Catharines was a terrible one. Canada was a strange frozen land, snow everywhere, ice everywhere, and a bone-biting cold the like of which none of them

asked by Callie on November 26, 2014
67. ## English

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. 1. When it looked like all hope was lost for winning

asked by Ethan on June 18, 2015
68. ## Math

12. Your neighbor pays \$40 to have her lawn mowed and always adds a 15% tip. You and your friend decide to mow the lawn together and split the earning evenly. How much will each of you make? 15*40=500 500+40=540 540/2=270 You and your friend will each make

asked by Rose on January 10, 2018
69. ## physics

A car with a weight of 15 000 N is being towed up a 20o slope at constant velocity. Friction is negligible. The tow rope is rated at 6 000 N maximum tension. a. Draw the free body diagram, by cleverly choosing the coordinate system. (5 marks) b. Calculate

asked by anonymus on September 2, 2018
70. ## physics

A block of mass m = 5 kg is attached to a spring (k = 28 N/m) by a rope that hangs over a pulley of mass M = 7 kg and radius R = 3 cm, as shown in the figure. Treating the pulley as a solid homogeneous disk, neglecting friction at the axle of the pulley,

asked by Anonymous on March 25, 2011
71. ## computer network engineering

a steel ball weighing 128 lb is suspended from a spring, whereupon the spring is stretched 2 ft from its natural length. the ball is started in motion with no initial velocity by displacing it 6 in above the equilibrium position. assuming no damping force,

asked by anisah on April 22, 2012
72. ## physics/ torques

A block of mass m = 5 kg is attached to a spring (k = 35 N/m) by a rope that hangs over a pulley of mass M = 7 kg and radius R = 4 cm, as shown in the figure. Treating the pulley as a solid homogeneous disk, neglecting friction at the axle of the pulley,

asked by HELP!!!! on April 3, 2011
73. ## math

a steel ball weighing 128 lb is suspended from a spring, whereupon the spring is stretched 2 ft from its natural length. the ball is started in motion with no initial velocity by displacing it 6 in above the equilibrium position. assuming no damping force,

asked by anisah on April 22, 2012
74. ## physics

A block of mass m = 5 kg is attached to a spring (k = 35 N/m) by a rope that hangs over a pulley of mass M = 7 kg and radius R = 4 cm, as shown in the figure. Treating the pulley as a solid homogeneous disk, neglecting friction at the axle of the pulley,

asked by Anonymous on April 3, 2011
75. ## College Chemistry

Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 215 mg/L. I calculated the molarity as 1.58*10^-3 and the Ka as 1.58*10^-10. I did ICE and i got the pH as 6.3, but it was

asked by Kyle on March 23, 2010
76. ## organic chemistry

How many milliliters of boiling water are required to dissolve 25 g of phthalic acid? If the solution were cooled to 14 degree Cellucius, how many grams of phthalic acid would recrystallize out?

asked by felici on September 2, 2012
77. ## Chemistry

What are the concentrations of Cu^2+, NH3, and Cu(NO3)4^2+ at equilibrium when 18.8 g of Cu(NO3)2 is added to 1.0 L of a .400 M solution of aqueous ammonia? Assume that the reaction goes to completion and forms Cu(NH3)4^2+.

asked by Jamila on March 17, 2015
78. ## chem

make an aqueous solution of 0.176 M copper(II) chloride for an experiment in lab, using a 300 mL volumetric flask. How much solid copper(II) chloride should you add

asked by Barb on November 22, 2015
79. ## Chemistry

If a 0.875 gnsample of barium chloride is dissolved in water and then treated with a sodium sulfate solution, how many grams of barium sulfate precipitate should be collected?

asked by Colby on July 29, 2013
80. ## chemistry

A solution containing 80g of NaNO3 in 75g of H2O at 50 degrees celsius is cooled to 20 degrees celsius, how many grams of solid NaCO3 crystallized after cooling?

asked by Boo Boo on November 18, 2012
81. ## chemistry

How many milligrams of magnesium palmitate will precipitate from 965ml of this solution when it is cooled from 50C to 25C? For Mg(C16H21O2)2, Ksp= 4.8x10(-12) at 50C and 3.3x10(-12) at 25C.

asked by matt on October 17, 2011
82. ## Algebra

The ordered pairs represent values for x and y. (1,1) is x =1 and y=1. Substitute these ordered pairs in the equations and evaluate to see if are true. Then, graph the points and line to find another solution.

asked by Michelle on September 19, 2011
83. ## CHEMISTRY

Methylamine (CH3NH2) forms hydroxide ions in aqueous solution. Why is methylamine a Brønsted-Lowry base but not an Arrhenius base? I need help on this question. Please explain this to me!

asked by Sean on March 14, 2010
84. ## Science

A solution is prepared by dissolving 15grams of table salt in 70grams of water. Find (a) mass percent of solute (b) mass percent of solvent.

asked by Araceli on July 7, 2014
85. ## Chemical

The molar enthalpy of solution for ammonium chloride is 14.8kJ/mol. What is the final temperature observed when 20.0g of ammonium chloride is added to 125mL water at 20.0'C?

asked by Han on September 14, 2014
86. ## Science

You need to make an aqueous solution of 0.201 M iron(II) bromide for an experiment in lab, using a 250 mL volumetric flask. How much solid iron(II) bromide should you add ?

asked by Billy on September 4, 2011
87. ## chemistry

if 5liters of hydrogen iodide gas is bubbled through 2 liters of 0.0275 M lead 2 nitrate solution at STP, how many grams of lead 2 iodide will precipitate out?

asked by jess on January 6, 2011
88. ## Chemistry

Determine the partial pressure of oxygen necessary to form an aqueous solution that is 7.7 x 10-4 M O2 at 25oC. The Henry's Law Constant for oxygen in water at 25oC is 1.3 x 10-3 M/atm

asked by Zoe on February 7, 2012
89. ## chemistry

a chemist dissolves kcl in water at constant temperature until no more kcl dissolves, how would you most accurately classify this solution, dilute, saturated, unsaturated or supersaturated?

asked by sidney betzler on March 9, 2016
90. ## Chemistry

If there are 0.625 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the molar concentration of the original solution? The molar mass of NaCl is 58.44 g/mol.

asked by Summer on September 11, 2014
91. ## chemistry

Chromium metal can be plated onto an object from an acidic solution of dichromate ions. What average current is required to plate 17.8 g of chromium metal in a time of 2.20 h?

asked by Rishikesh on April 19, 2008
92. ## Chemistry

The hydronium ion concentration for a solution is determined to be 4.5 x 10^-7 M. What is the concentration of the hydroxide ion? I just wanted to let the people that are being nice enough to help me know that this is for a study guide. It is not a test or

asked by Amber on November 25, 2012
93. ## Chemistry 2

When 5.0g of CaCl2 was dissolved in 50 ml of water in a coffee cup calorimeter, the temperature of the solution rose from 22.3C to 30.5C. What is the qsoultion in J and what is the qrxn in J? What is the deltaH in kJ/mol of CaCl2 dissolved?

asked by nikk on September 8, 2015
94. ## Ochemistry

4-chlorophenol is insoluble in water. Explain why 4-chlorophenol dissolves in 2.5M aqueous NaOH solution. -Besides NaOH being a strong base and a great nucleophile is there any other reason ?

asked by Blair on January 13, 2009
95. ## AP Chemistry

Suppose you have added 200.0 mL of a solution containing 0.5000 moles of acetic acid per liter to 100.0 mL of 0.50000 M NaOH. What the is the final pH? The Ka of acetic acid is 1.77 x 10^-5.

asked by Freddy on March 8, 2015
96. ## chemistry electochem

can someone explain this to me, looking at graphs in my textbook, it seems as concentration increases the electric potential goes down? why is this? wouldn't you suspect that as the more concentrated a solution is the greater the electric potential read?

asked by Anonymous on April 25, 2016
97. ## Chemistry

If you need to make a solution of 1.0L at 2.5M citric acid and you only have 45mL of 5.0M citric acid, do you have enough for your experiment? If a mathematical procedure is involved, please explain to me; I really want to grasp this chemistry concept.

asked by Lie-ma Been on June 11, 2014
98. ## chemistry

A volume of 100mL of a 0.800 M HNO3 solution is titrated with 0.640 M KOH. Calculate the volume of KOH required to reach the equivalence point.

asked by LL on August 6, 2012
99. ## Chemistry

what is the solubility in mol/L of insoluble Ca3(PO4)2 (Ksp=1.00x10^-26)in a solution containing .00100 M Na3PO4? a. 2.15x10^-7 b. 7.18x10^-8 c. 7.18x10^-9 d. 1.00x10^-23 e. answer not given

asked by alex on March 20, 2012
100. ## chemistry

calculate the vapor pressureof a solution of 20.0g sucrose (C12H12O6) in 80.0g water at 25 degrees celsius (vapor pressure, P, of pure water at 25C is 24torr)

asked by honeeey on September 27, 2012