# Calculate the pH of the solute in an aqueous solution of 0.0047 M codeine, if the pKa of itsconjugate acid is 8.21. What is the percentage protonation of the solute?

46,915 questions, page 385
1. ## chemistry

Thermochemistry: 1. Calculate the amount of heat required to decompose 3.5 moles of sodium bicarbonate. 2NaHCO3 + 129 kJ  Na2CO3 + H2O + CO2 In this question, the heat of the reaction is part of the question instead of being written beside it- (What's

asked by Bethany on March 17, 2015
2. ## Chemistry

What is the molar mass of Ag2CrO4 I think you should search in askforkids website. I went there and I got help with my English Homework. My name is Tanisha and your name is Tasheena. Similar Right? Look them up in the periodic table and add their masses.

asked by Tasheena on December 26, 2006
3. ## Programming Logic & Design

Modify the previous process to store the scores in an array. You will need to use either parallel arrays or a two-dimensional array in order to store the score, slope and rating for each entry. In the loop you created in the previous assignment to read the

asked by Julie on April 10, 2014
4. ## algebra

Determine the value(s) of k for which x^2+(k-2)x-2k=0 has equal and real roots. a x^2 + bx + c = 0 has two different roots if the discriminant D defined as: D = b^2 - 4 a c does not equal zero. If D = 0 then there is one root. That root is then real if b/a

asked by Shay on January 18, 2007
5. ## chem 11

You have 2 chemicals A (solid) and B (solid), but you do not know the exact composition of either one of them. You do know that all together, there is SOME combination of sodium, barium, chloride and phosphate (PO4^3-) present. You dissolve both chemicals

asked by Anonymous on July 18, 2010
6. ## physics

A 1-kg mass (the blue mass) is connected to a 9-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

7. ## physics

A 1-kg mass (the blue mass) is connected to a 9-kg mass (the green mass) by a massless rod 70 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

asked by deb on March 24, 2012
8. ## physics

A 1-kg mass (the blue mass) is connected to a 9-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

asked by hania on March 25, 2012
9. ## physics

A 1-kg mass (the blue mass) is connected to a 8-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

asked by hania on March 25, 2012
10. ## physics

A 1-kg mass (the blue mass) is connected to a 9-kg mass (the green mass) by a massless rod 67 cm long, as shown in the figure. A hole is then drilled in the rod 40.2 cm away from the 1-kg mass, and the rod and masses are free to rotate about this pivot

asked by Anonymous on March 26, 2012
11. ## chemistry

A cylinder is filled with 10.0L of gas and a piston is put into it. The initial pressure of the gas is measured to be 200.kPa. The piston is now pushed down, compressing the gas, until the gas has a final volume of 3.10L. Calculate the final pressure of

12. ## chemistry

A cylinder is filled with 10.0L of gas and a piston is put into it. The initial pressure of the gas is measured to be 200.kPa. The piston is now pushed down, compressing the gas, until the gas has a final volume of 3.10L. Calculate the final pressure of

asked by Alexander on October 16, 2018
13. ## chemistry

A calorimeter contained 75g of water at 16.95 degree Celsius. A 93.3g Iron at 65.58 degrees celsius was placed in it, giving a final temperature of 19.68 degrees Celsius for the system. Calculate the heat capacity of the calorimeter. specific heats are

asked by help on September 15, 2018
14. ## Physics/mats

Two blocks with masses m1 = 1.40 kg and m2 = 3.00 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.390.In the figure m1 is on top of

asked by HP on March 7, 2013
15. ## Physics

Two blocks with masses m1 = 1.40 kg and m2 = 3.00 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.390.In the figure m1 is on top of

asked by Heidi on March 6, 2013
16. ## Econ stats

Sidney Crosby’s score statistics for the regular 2007 championship season were used to construct the following table: Experimental Outcome (x), Number of Occurrences during the 2007 Season (0, 358) (1, 175) (2 28) (3 3) (4 10) a. Use the relative

asked by Maya on November 2, 2017
17. ## physics

img145.imageshack.us/img145/7130/picture1n.png this is basically the diagram to my question A person of mass m = 62 kg is doing push-ups as shown in the attached figure. The distances are a = 91 cm and b = 60% of l1. Calculate the vertical component of the

asked by anna on November 4, 2010
18. ## Mathematics

a cuboid with length 13cm width 4cm and height h State in terms of h the shaded face of the cuboid. write an expression in terms of h for the volume of the cuboid. if the volume of the cuboid is 286cm cube calculate the height h of the cuboid.

asked by SAM on May 2, 2012
19. ## AP CHEMISTRY

Consider the reaction. PbCO3(s) PbO(s) + CO2(g). calculate the equilibrium pressure of CO2 in the system at the following temperatures.(IN atm) (a) 270°C (b) 480°C ..... delta Hf(KJ/mol).. d.Gf(KJ/mol).. S(J/mol-K) PbCO3(s)..-699.1 .. -625.5 .. 131.0

asked by DAN on March 20, 2012
20. ## Materials Science and Engineering

In the figure below, Intrinsic carrier concentration is given as a function of temperature for Ge and Si. By using the data in this figure calculate the band gap of these materials. For both materials find the energy difference between the Fermi Energy

asked by hewhomustbenamed82 on April 1, 2018
21. ## Physics

A curling stone with a mass of 18 kg slides 38m across a sheet of ice in 8.0 s before it stops because of friction. What is the co¨efficient of kinetic friction between the ice and the stone? (Note: you will need to calculate the acceleration of the stone

asked by Sarah on October 29, 2015
22. ## Chemistry

A sample of methane (CH4) gas contains a small amount of helium. Calculate the volume percentage of helium if the density of the sample is 0.70902 g/L t 273K and 1.00 atm. I know that the sample is at STP and that the 1 mole of gas under these conditions

asked by Chris on October 29, 2014
23. ## chemistry lab

Could someone help me with this? i am tired of it. here is my data from lab: Buffer1: HPO4- weight 3.412g; original pH Buffer 2: HEPES wt: 1.090g original pH 10.08 buffer1: pH of 0.1M: 7.5; pH of 0.01: 7.72; pH of 0.001M: 7.87 buffer2: PH of 0.1M: 7.5 ph

asked by amanda on February 1, 2008
24. ## Chemistry

here is the question. it is a fact that when you add acetone to saturated sodium chloride, the equilibrum shifts towards the right. what observation supports this fact? what is the role of acetone in shifting the equilibrium towards the right side? What

asked by Dalala on March 21, 2010
25. ## Physics

A 645-kg elevator starts from rest and reaches a cruising speed of 1.47 m/s after 3.13 seconds. It moved 2.75 m during that time. What average power (W) is delivered by the motor during the initial acceleration of the elevator during the first 3.13

asked by Casey on June 6, 2011
26. ## 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
27. ## 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
28. ## algebra

Solve the following system of equations. You will type your x value in the first part and the y value in the second part of the question. If the answer if no solution then type NS in both parts and if the the answer is infinite solutions then type I in

asked by samay on January 22, 2018
29. ## Algebra II

How many real solutions does the function shown on the graph have? a) no real solutions b) one real solution c) two real solutions d) cannot be determined ___________________________ y = (x+2)^2 + 3 is shown on the graph. I am having trouble figuring this

asked by Anonymous on January 12, 2018
30. ## Math

Solve the following system of equations. You will type your x value in the first part and the y value in the second part of the question. If the answer if no solution then type NS in both parts and if the the answer is infinite solutions then type I in

asked by Bill on January 24, 2018
31. ## math

Solve the following system of equations. You will type your x value in the first part and the y value in the second part of the question. If the answer if no solution then type NS in both parts and if the the answer is infinite solutions then type I in

asked by Anonymous on January 23, 2018
32. ## 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
33. ## Trig

A group of friends are going on a vacation together. They plan to rent a large house for \$3000 and share the cost. They also estimate that the buying food for the week will cost \$150 per person. Write a reciprocal function to calculate the cost per person

asked by John on December 7, 2017
34. ## Physics

At the bow of a ship on a stormy sea, a crewman conducts an experiment by standing on a bathroom scale. In calm waters, the scale reads 172 lb. During the storm, the crewman finds a maximum reading of 215 lb and a minimum reading of 131 lb. Calculate the

asked by Lilly on February 21, 2012
35. ## Honors Physics

A mechanic jacks up the front of a car to an angle of 8.8° with the horizontal in order to change the front tires. The car is 2.92 m long and has a mass of 1330 kg. Gravitational force acts at the center of mass, which is located 1.02 m from the front

asked by Donkey on November 17, 2015
36. ## physics

A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 18.0° with the horizontal. A 22.0 kg piece of luggage is

asked by Anonymous on November 4, 2012
37. ## chemistry

Phosgene (COCl2) is an extremely poisonous gas that was used extensively in World War I as a chemical warfare agent. At 300oC, phosgene decomposes to carbon monoxide and chlorine with a Kp = 6.8 x 10-2. Calculate the pressure in the vessel at equilibrium

asked by Samuel on October 13, 2008
38. ## Physics

Periodic waves spread out over the surface of a lake where two women, Jenny and Melissa, are fishing in separate boats 102 meters apart. Each woman's boat bobs up and down 19/min. At a time when Jenny's boat is at a crest, Melissa's boat is at its lowest

asked by Anonymous on March 7, 2013
39. ## ChemistryStociometry

6.0g of cobolt (II) carbonate was added to 40cm3 of hydrochloric acid, concentration 2.0 mol/dm3. Calculate the maximum yield of cobalt (II) choloride-6-water and show that cobalt (II) carbonate was in excess. CoCO3 +2HCl = CoCl2 +CO2 + H2O CoCl2 + 6H2O =

asked by RM on January 1, 2017
40. ## Chemistry

Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (D) calculate E at the

asked by Sam on January 24, 2015
41. ## Physics

A car with a mass of 1264 kg is coasting in neutral on a straight,level road. It slows down, and its speed as a function of time is given by the equation: Constant Value Units a 26.8 m/s b 0.310 m/s2 c 2.10·10-3 m/s2 At a time of 36.0 s the speed, as

asked by John on January 2, 2014
42. ## physics for scientists and engeneers I

A 0.145-kg baseball pitched horizontally at 27 m/s strikes a bat and is popped straight up to a height of 43 m. If the contact time between the bat and the ball is 2.35 ms, calculate the average force [exerted by the bat on the ball] during contact. [Let

asked by Johnathon on February 15, 2011
43. ## Calculus

A sinusoidal section is to be built as part of a roller coaster track. The high point is h=27 m at a horizontal distance d=0 m. It has a low point at h=-3 m at d=50 m. a. Write an equation expressing h in terms of d. b. The lengths of the horizontal

asked by Nick on September 23, 2014
44. ## Physics

Consider a 59-cm-long lawn mower blade rotating about its center at 2990 rpm. (a) Calculate the linear speed of the tip of the blade. (b) If safety regulations require that the blade be stoppable within 3.0 s, what minimum angular acceleration will

asked by Camilla on June 16, 2012
45. ## Physics

A mechanic jacks up the front of a car to an angle of 6.2° with the horizontal in order to change the front tires. The car is 2.91 m long and has a mass of 1100 kg. Gravitational force acts at the center of mass, which is located 1.02 m from the front

asked by Mike on March 3, 2011
46. ## ap chemisty

Calculate the heat of formation of butane given that the heat of formation of H20(l) is -285.3 kj/mol and the heat of formation of CO2(g) is -393.5 kj/mol.

asked by Sarah on September 24, 2010
47. ## Physics

A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and b) the average speed.

48. ## Math

In a family six members eat meat; five members eat fish while two eat both. Calculate the number of members in the family. How do we solve these ones? Hints please...

asked by Christopher on May 30, 2014
49. ## math

The bearing of A and B from a port p are 225 degree and 116 degree respectively.ship A is 3.9 km from ship B on a bearing of 258 degree. Calculate the distance of ship A from p

asked by miracle on November 14, 2017
50. ## math help plz!

Calculate the future value of quarterly payments of \$1200 for 5 years, if the rate of interest was 10% compounded quarterly for the first 2 years and will be 9% compounded quarterly for the last 3 years.

asked by Thara! on April 21, 2010
51. ## Chemistry

Calculate the equilibrium constant 2SO2(g]+O2(g]⇌2SO3(g] given equilibrium constant of SO2,O2,SO3 are 0.3m,0.14,1.45 respectively wt happens to the equilibrium constant a) if so2 is added b)if o2 is removed

asked by MANASA on November 30, 2016
52. ## Maths

A floor is measuring 8 metres by 6 metres is covered with carpet. If carpet costs \$25.00 per square metres, calculate the cost of the carpet for the floor.

asked by Faith on October 11, 2015
53. ## Chemistry

Bill and Bob have been testing a new aluminised PET (Polyethylene Terephthalate) film and they now use the material to make helium filled balloons. Bill’s balloon is less inflated than Bob’s, and the latter jokes about it. However, Bill insists he has

asked by MM on February 8, 2012
54. ## Chemistry

Bill and Bob have been testing a new aluminised PET (Polyethylene Terephthalate) film and they now use the material to make helium filled balloons. Bill’s balloon is less inflated than Bob’s, and the latter jokes about it. However, Bill insists he has

asked by MM on February 8, 2012
55. ## Chemistry

1. When the hydrochloric acid is added to the calcium carbonate, will there be an excess of HCl(aq) or CaCO3(aq) or will there be stoichiometric equivalents of the two? Show your calculations. 2. In this lab, you will use a 50mL buret and ~0.3M NaOH (aq).

asked by Doug on October 11, 2017
56. ## Economics

How does the expenditure approach calculate GDP? ____________________________________ A. It adds up all the incomes in the economy.***** B. It adds up the value of four groups of final goods and services. C. It adds up the value of business goods and

asked by ♥Nirvana♥ on February 17, 2016
57. ## chemistry

2. Calculate the enthalpy change of combustion for ethene gas (C2H4) given the following enthalpy changes of formation: ΔHºf(C2H4)(g) = +52 kJ mol^-1 ΔHºf(CO2)(g) = -394 kJ mol^-1 ΔHºf(H2O)(g) = -286 kJ mol^-1

asked by John on July 19, 2014
58. ## Chemistry

A sample of calcium carbonate that has a mass of 1.0 g is heated and completely decomposed-calculate. a) the mass of carbon dioxide produced b)the volume of carbon dioxide at SLC c)the volume of carbon dioxide at STP

asked by Ally on May 2, 2013
59. ## physics

An object whose height is 3.5 cm is at a distance of 8.5 cm from a spherical concave mirror. Its image is real and has a height of 11.2 cm. Calculate the radius of curvature of the mirror. How far from the mirror is it necessary to place the above object

asked by help? on May 24, 2008
60. ## physics

You throw a 134 g ball straight up to a height of 43.0 m. (a) Assume that the displacement of your hand is 0.70 m as you throw the ball straight up. How long is the ball is in your hand? (b) Calculate the average force exerted by your hand while you are

asked by Nick on March 7, 2012
61. ## Physics

Calculate the distance, in m, of the centre of mass of the Earth-Moon system from the centre of the Earth. Note: the mass of the Moon is 7.35x10 22kg, the mass of the Earth is 5.98x10 24kg, and their separation is 3.85x10 8m.

asked by Amber on April 22, 2016
62. ## Physics

a stone is projected vertically upward with a velocity of 20,two seconds later a second stone is similarly projected with the same velocity, when the two stones meet,the second one is rising at a velocity of 10, calculate the length of time the second

asked by Covenant on December 19, 2018
63. ## math

An airplane flies from a town X on a bearing of N45 0E to another town Y, a distance of 200km. It then. Changes course and flies to another town Z on a bearing of S60 0E. If Z is directly east of X, calculate, correct to 3 significant figures. a. the

asked by alex on March 2, 2019
64. ## physics

An object whose height is 3.5 cm is at a distance of 8.5 cm from a spherical concave mirror. Its image is real and has a height of 11.2 cm. Calculate the radius of curvature of the mirror. How far from the mirror is it necessary to place the above object

asked by help? on May 25, 2008
65. ## maths

the distance covered by a falling ball varies as the square of the time taken. If a ball falls through 1800m in 15seconds,calculate the distance when the time taken is 15seconds and the time taken for is distance of 648m.solve using variation

asked by chinaemerem on April 25, 2017
66. ## chemistry

Calculate the delta H for the reaction N2H4(l)+ O2(g) --> N2(g) + 2H20(l) Given the following data: 2NH3(g) + 3N20(g) --> 4N2(g) + 3H20(l) N20(g) + 3H2(g) --> N2H4(l) + H20(l) 2NH3(g) + 1/2O2(g) --> N2H4(l) + H20(l) H2(g) + 1/2O2(g) --> H20(l)

asked by kilo on October 28, 2009
67. ## Chem

10.0 grams of barium chloride (208.3g/mol) is reacted with excess potassium phosphate and 7.22 of grams of barium phosphate (601.8 g/mol) is isolated. calculate the theoretical yield of barium phosphate

asked by Anonymous on April 3, 2014
68. ## Maths,variation

the distance covered by a falling ball varies as the square of the time taken. If a ball falls through 1800m in 15seconds,calculate the distance when the time taken is 15seconds and the time taken for is distance of 648m.solve using variation

69. ## Physics

A physicist converted 2 kg of water at 37 degrees celcius to steam at 100 degrees celcius. Assuming no heat is lost, calculate the amount of energy needed to heat to 100 degrees celcius.

asked by i need help on June 5, 2015
70. ## 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
71. ## 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
72. ## Algebra

The work and solution to: Stefan is bicycling on a bike trail at an average of 10 miles per hour. Erik starts bicycling on the same trail 30 minutes later at 16 miles per hour. How long will it take Erik to pass Stefan?

asked by Michelle on May 29, 2013
73. ## physics!!

The two masses (m1 = 4.96 kg and m2 = 2.90 kg) in the Atwood's machine shown in the figure below are released from rest, with m1 at a height of 0.800 m above the floor. When m1 hits the ground its speed is 0.203 m/s. Assuming that the pulley is a uniform

asked by Emily on October 21, 2012
74. ## Chemistry

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. A chemical engineer places a mixture of noble gases consisting of 4.50 g of He, 15.0 g of Ne, and 33.6 g of Kr in a piston-cylinder

asked by Arian on October 18, 2010
75. ## Chemistry-Rates of Reaction

A chemist wishes to determine the rate of reaction of zinc with hydrochloric acid. The equation for the reaction is: Zn(s) + 2HCl(aq) ---> H2(g) + ZnCl2(aq) A piece of zinc is dropped into 1.00 L of 0.100 M HCl and the following data were obtained:

asked by Juggy on April 18, 2010
76. ## math

As you and your spouse are discussing your monthly budget at the dinner table one night, you are both curious as to how much of your \$325 car payment is going to principal and how much to interest. Knowing that you are paying an APR of 3.75% to the bank

asked by emma on June 8, 2013
77. ## stat

Problem 2. THE PROBABILITY THAT A RANDOMLY CHOSEN SALES PROSPECT WILL MAKE A PURCHASE IS 0.20. IF A SALESMAN CALLS ON SIX PROSPECTS, A. WHAT IS THE PROBABILITY THAT HE WILL MAKE EXACTLY FOUR SALES? B. WHAT IS THE PROBABILITY THAT THE SALESMAN WILL MAKE

asked by siddhi on May 1, 2012
78. ## 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
79. ## 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
80. ## 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
81. ## 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
82. ## 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
83. ## mATH, ALGEBRA

i need help solving the system by addition. 5x-7y=5 x+3y=1 this is what i think but i am not sure 3y=-x+1 y= -(1/3)x+(1/3) 5x - 7 (-1/3x + 1/3) = 5 5x+2.3333331x-2.3333331=5 7.3333331x-2.3333331=5 7.3333331x=7.3333331 x=1 x+3y=1 1+3y=1 3y=1-1 3y=0 y=0 so

asked by jasort120 on April 13, 2007
84. ## 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
85. ## 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
86. ## 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
87. ## chemistry

I was having trouble with this problem. initial pressure for the compounds involved in the reaction displayed were determined to be P(CO(g)) = 0.5794 atm, P(H2O(g)) = 0.5662 atm, P(CO2(g)) = 0.7950 atm, P(H2(g)) = 0.2754 atm. Calculate the value of the

asked by andy on April 8, 2010
88. ## Physics (A-level)

A ball was projected horizontally at a speed of 0.52 m s–1 across the top of an inclined board of width 600 mm and length 1200 mm. It reached the bottom of the board 0.9 s later (Figure 4). Calculate: a the distance travelled by the ball across the

asked by Jeffrey Jones on October 20, 2015
89. ## Chem

Consider a glass of 277 mL of water at 25°C. Calculate the mass of ice at -15°C that must be added to cool the water to 10°C after thermal equilibrium is achieved. To find the mass of water use the density of water = 1.0 g/mL. I have no idea how to

asked by Don on February 1, 2011
90. ## physics

(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 8.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very

asked by Rachel on March 26, 2011
91. ## chemistry

What is the difference between a strong electrolyte and a weak electrolyte? Explain what makes an electrolytic solution strong or weak. Do you look at the pH to determine between a strong electrolyte and a weak one?

asked by Anonymous on May 3, 2010

You are planning to spend no less than \$6,000 and no more than \$10,000 on your landscaping project. Suppose you want to cover the backyard with decorative rock and plant some trees as the first phase of the project. You need 30 tons of rock to cover the

asked by Anonymous on June 3, 2008
93. ## chem 101

A 0.6753 g sample of an unknown metal was converted to the nitrate, MCl2, then a solution of the nitrate was treated with silver nitrate to give MCl2 (aq) + 2 AgNO3 → M(NO3)2 + 2 AgCl(s) silver chloride crystals. The silver chloride was isolated and

asked by harley on March 17, 2012
94. ## As physics

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Calculate the number of free electrons

asked by cylinder on December 12, 2017
95. ## CHEM

Please help me, i don't know how to approach this question! All ammonium salts on heating with sodium hydroxide produce ammonia gas. From which ammonium salt can the greatest mass of ammonia be obtained? a)0.5 mol of (NH4)3PO4 b)0.5 mol of (NH4)2SO4 c)1

asked by Marrion on October 20, 2009
96. ## -MATH-

h=-16t2+80t+96 Use this position polynomial to calculate the following: 1.The height of the object after 2 seconds 2.The height of the object after 4 seconds 3.How long the object will take to reach the ground? 4.Write the position function for an object

asked by Steph on December 2, 2013
97. ## physics

A diver runs and dives off the end of a spring board that is 0.9 meters above the surface of the water. As she takes off from the diving board, her velocity is 5.2 m/s directed 36° above horizontal calculate: a) the time she is in the air s b) the

asked by Mat on October 29, 2012
98. ## thermodynamic

an engine operates on the carnot cycle between the temperature limits of 250c and 50c. the pressure and the volume at the start of the isothermal expansion are 6 bar and 0.1 m^3 respectively. pressure after isothermal expansion is 3 bar. assume