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August 28, 2014

Posts by kelly


Total # Posts: 1,504

chemistry
what is the experimental percent of sulfate in alum?
October 10, 2010

math
find the equation of the line pasiing throught the given point. Use function notation to write the equation. (-2,11)and(1,-4) f(x)
October 8, 2010

physics
4.4
October 7, 2010

geometry
(12x-15)=(3x+45)
October 6, 2010

ap chemistry
A mixture contains only NaCl and Fe(NO3)3. A .456 gram sample of the mixture is dissolved in water and an excess of NaOH is added, producing a precipitate of Fe(OH)3. The precipitate is dried and filtered, and its mass is determined to be .107 g. The mass of iron in the sample...
October 6, 2010

Chemistry Help
Thank you so much for your help, for the following question i am getting wrong answers answell. for the first one i got 42.7 and the 2nd I got 19.8. Could you help? Thank you for help in advance 4Cr(s) = 3O_2(g) -> 2Cr_2O_3(s) 2Cr(s)+O_2(g)->2SrO(s)
October 5, 2010

Chemistry Help
I have tried usingg the molecular formula, formulas in the text book but my answers dosent match any of the multiple choice answers, can someone help? For each of the reactions shown, calculate the mass (in grams) of the product formed when 10.7 g of the underlined reactant ...
October 5, 2010

College Chemistry-Please help me
I need to find the ionic equation of: 3Ba(OH)2(aq)+2H3PO4(aq)->Ba3(PO4)2+6H20(l) I'm totally lost on this question
October 4, 2010

math
16x^7y^12-10X^5y^8/2x^2y^9 =(16x^7y^12/2x^2y^9)-(10x^5y^8/2x^2y^9) =((16/2)*x^(7-2)*y^(12-9))-((10/2)*x^(5-2)*y^(8-9)) =8x^5y^3-5x^3y^-1 or =(8x^5y^3)-((5x^3)/y)
October 4, 2010

college chemistry
A chemical engineer determines the mass percent of iron in an ore sample by converting the Fe to Fe^2+ in acid and then titrating the Fe^2+ with MnO4^-. A 1.3510 g sample was dissolved in acid and then titrated with 39.32 mL of 0.03190 M of KMnO4. The balanced equation is: 8H...
October 4, 2010

college chemistry
I need to find the ionic equation of: 3Ba(OH)2(aq)+2H3PO4(aq)->Ba3(PO4)2+6H20(l)
October 4, 2010

College Chemistry
What is the oxidation number of (NH4)2SO4
October 3, 2010

College Chemistry
What is the oxidation number of Cr2(SO4)3
October 3, 2010

College Chemistry
I balanced the equation: HBr(aq) +NH3(aq)->NH4Br I need to find the ionic equation and the net ionic equation
October 3, 2010

geometry
mo bisects angle lmn,m angle lmn = 6x-20, m angle lmo= x+32 find m angle nmo but how if i don't know what lmn is From the above info you know lmo=nmo and lmo+nmo=lmn so 2(lmo)=lmn 2(x+32)=6x-20 2x+64=6x-20 2x+84=6x 84=4x 21=x you know lmo=x+32=21+32=53 you also know lmo=...
October 3, 2010

College Chemistry
Sodium hydroxide is used extensively in acid-base titrations because it is a strong inexpensive base. A sodium hydroxide solution was standardized by titrating 27 mL of 0.1628 M standard hydrochloric acid. The initial buret reading of the sodium hydroxide was 2.44 mL, and the ...
October 3, 2010

college chemistry
You are given solutions of HCl and NaOH and must determine their concentrations. You use 38 mL of NaOH to titrate 100 mL of HCl and 23.2 mL of NaOH to titrate 50 mL of 0.0782 M H2SO4. Find the unknown concentrations.
October 3, 2010

Math
[(8*2)- 13]^3+(4-1)^2+4-2*3+|3|-|-6|=? [16-13]^3+(3)^2+4-2*3+3-6 [3]^3+9+4-6+3-6 27+9+4-6+3-6 36+4-6+3-6 40-6+3-6 34+3-6 37-6 31
October 3, 2010

composition and communication
I need help identifying verb tanses. I have to write 5 sentences about the " role education plays in successful financial planning" using different verb tenses. This is what I have: 1. Education plays an important role in a person’s financial status. (PRESENT ...
October 3, 2010

chemistry
Determine the oxidation state for the second element in SO3
September 30, 2010

chemistry
so what wouldit be for Mg3P2? if it has a subscript?
September 30, 2010

chemistry
Determine the oxidation state for the SECOND element in each of the following: NaF _____ Could you give me the steps to determine the answer
September 30, 2010

geometry
A thin wire is formed into a rectangle with an area of 24 cm2. If it is reshaped so that the 6 cm side is 2 cm longer, how will the area change?
September 27, 2010

College Chemistry
How many milliliters of a 0.200M AgNO3 solution are required to preccipitate most of the Cl^- ions from a solution containing 0.855 g of NaCl?
September 27, 2010

College Chemistry
Pb+NO3+Na2SO4-->?
September 27, 2010

algebra
5c+5d-8(7c-4d) distribute 5c+5d-56c+32d combine like terms -51c+37d
September 27, 2010

College Chemistry
The concentration of lead ions (Pb^2+) in a sample of polluted water that also contains nitrate ions (NO3) is determined by adding solid sodium sulfate (Na2SO4) to the sample of the water. Write the net ionic equation for the reaction. Do not forget to indicate the state of ...
September 27, 2010

MATH
consistent and independent because the answer is (1,4)
September 26, 2010

college chemistry
How many total moles of ions are released when the following sample dissolves completely in water: 5.15x10^-3 g Ca(NO3)2
September 26, 2010

CHEMISTRY
THE FOLLOWING SOLUTIONS AREMIXED TOGETHER: 121mL OF 1.54 M AgNO3 AND 45mL OF 1.07 M K2SO4 CALCULATE THE MOLAR CONCENTRATION OF Ag+ IONS IN THE FINAL SOLUTION
September 26, 2010

math factoring
(a)5x-3x^2 x(5-3x) remove GCF (b)25-x^2 (5+x)(5-x) Diff of 2 squares
September 26, 2010

Chem
THE FOLLOWING SOLUTIONS AREMIXED TOGETHER: 121mL OF 1.54 M AgNO3 AND 45mL OF 1.07 M K2SO4 CALCULATE THE MOLAR CONCENTRATION OF Ag+ IONS IN THE FINAL SOLUTION
September 26, 2010

chemistry
A 1.500-g sample of a mixture containing only Cu2O and CuO was treated with hydrogen to prduce 1.252 g pure copper metal. Calculate the percentage composition (by mass) of the mixture.
September 26, 2010

chemistry
a mixture containing only sodium chloride and potassium chloride has a mass of 4 g. when this sample is dissolved in water and excess silver nitrate is added a white solid forms. after filreation and drying the solid silver chloride has the mass of 8.5904g. calculate the mass ...
September 25, 2010

Chemistry
A 40.0g sample of an unknow, yellowish-brown, pure metal was heated to 62degrees Celcius and put into a coffee cup calorimeter containing 85.0g of watera at 19.2 degrees Celcius. The water was heated by the hot metal to a temperature of 21.0 degrees Celcius. What is the ...
September 24, 2010

Chemistry
A 40.0g sample of an unknow, yellowish-brown, pure metal was heated to 62degrees Celcius and put into a coffee cup calorimeter containing 85.0g of watera at 19.2 degrees Celcius. The water was heated by the hot metal to a temperature of 21.0 degrees Celcius. What is the ...
September 24, 2010

chemistry
For OCTANE, what is the ratio of Carbon atoms to Hydrogen atoms in a molecule? It's specified that Octane undergoes complete combustion to form 8L of Carbon Dioxide & 9L of Water at constant temp and pressure. thanks :)
September 24, 2010

chemistry
Substances A and B with the same mass and the same initial temperature absorb the same amount of heat energy. The final temperature of A is higher than the final temperature of B. Which substance would have the higher specific heat? Why?
September 24, 2010

algebra
Solve P=2L+2W for L. L=
September 24, 2010

math
what is 6 to the second power
September 21, 2010

college physics
A swimmer is heading straight for the other shore of a river with a velocity of vs=0.7 m/s relative to the water, but is carried away by the current, which has a velocity of vr=0.3 m/s. It takes her 20.3 s to get across. How far downstream does she end up? Can someone please ...
September 20, 2010

college physics
An airport worker needs to make it across a luggage belt in order to retrieve a stuck suitcase. The belt is moving with 1.6 m/s, and the worker can run with v=1.7 m/s. If he wants to make it straight across the d=2.3 m wide belt, how long will it take for him to reach the ...
September 20, 2010

Math
BW made c cookies to divide evenly amoung O,TS,SB,and RD and BW himself. Write an algebraic expression that represents the number of cookies each person will receive. I have no clue...sorry those were intitals the problem characters had long names.
September 20, 2010

Physics
A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.2 cm from the center of the disk, what are the revolutions per minute (rpms) of the disk? ***Can someone please step me through the problem step by step?***
September 19, 2010

chemistry
in trial one the mass of silver oxide is .5g. The mass of silver metal product is .431 grams. In trial two the silver oxide=.498 and silver metal=.388. Use the conservation of mass to calculate the mass of oxygen that combined with the silver
September 19, 2010

physics
how do you divide 1.49457 x 10^11 by 3.00 x 10^8? thanks for the help
September 18, 2010

algebra
solve the equation m-26/5-5m-28/6=2
September 17, 2010

Physics
The ratio R at which paint can be sprayed from a spray gun may be expressed as R=a.t and R is measured in m3 / s and time is measured in seconds, what are the units of "a"?
September 17, 2010

physics
Using dimensional analysis, which one of the following equations is dimensionally correct? ( a → m/s2, v → m/s, x → m , t → s)
September 17, 2010

math
312 yd.
September 16, 2010

Math
I don't know if I suppose to do LCM or other?I'm going to need help. Beyonce visits her parents every 6 days and Jay-Z vists his parents every 9 days. When will it be the first day they visit there parents on the same day?
September 16, 2010

economics
What institutions might arise in the free market to help a person decide whether to accept or reject a particular private monetary note?
September 15, 2010

Math
what is are some free websites that can give me rational and irrational practice?
September 15, 2010

chemistry
thank you
September 14, 2010

chemistry
calculate the specific heat (j/g C ) for each of the following: -an 18.5-g sample of tin that absorbs 183 J when its temperature inceases from 35.0 degrees C to 78.6 degrees C
September 14, 2010

chemistry
how to simplify (x 3-x)/(x-1)?
September 14, 2010

chemistry
15. On October 21, 1982, the Bureau if the Mint changed the composition of pennies. Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2 Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by ...
September 12, 2010

physics
sorry i have about 5 questions on this homework packet that i just can't figure out.... hope you can help me A bowling ball (mass = 7.2 kg, radius = 0.12 m) and a billiard ball (mass = 0.41 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude...
September 12, 2010

chemistry
Mercury poisoning is a debilitating disease that is often fatal. In the human body, mercury reacts with essential enzymes leading to irreversible inactivity of these enzymes. If the amount of mercury in a polluted lake is 0.4 mg Hg/mL, what is the total mass in kilograms of ...
September 10, 2010

chemistry
that didnt have the right answer i need the steps
September 8, 2010

chemistry
2.70 g/cm3 to pounds per cubic foot
September 8, 2010

math
x^4-1/x^3=0
August 28, 2010

math
cos((sin^-1) 1/2)) sin^-1(sin 7pi/6)
August 26, 2010

Math
Vehicle A averages 14 miles per gallon of gasoline, and Vehicle B averages 36 miles per gallon of gasoline. At these rates, how many more gallons of gasoline does Vehicle A need than Vehicle B to make a 1,008-mile trip?
August 26, 2010

math
using point-slope form write an equation, perpendicular to the line y-4=-2(x-3), containing the point (3,4)
August 25, 2010

math
thank you!
August 25, 2010

math
12x^2=3x
August 25, 2010

math
whoops sorry (x-3)(x+3)>0
August 25, 2010

math
solve of x: (x-3)(x+)>0
August 25, 2010

chemistry
how would you prepare 1L of a .5M solution of each of the following? Sodium carbonate from the pure solid
August 25, 2010

chemistry
how would you prepare 1.00 L of 0.50 M solution of NiCl2 from the salt nicl2·6H2O? thanks :)
August 24, 2010

chemistry
how would you prepare 1.00 L of a .50M solution of H2SO4 from concentrated (18M) sulfric acid?
August 24, 2010

college
no you already lost me
August 19, 2010

college
Construct a frequency distribution table for the following scores. Include columns for proportion and percentage in the table. Scores: 5, 7, 8, 4, 7, 9, 6, 6, 5, 3 9, 6, 4, 7, 7, 8, 6, 7, 8, 5
August 19, 2010

Algabra
Train A travels at 100 mph in the same direction. Train B travels at120 mph on a parallel track. Train A passes a station at 8:25 pm, Train B passes the same station at 8:37 pm. What time will Train B catch Train A?
August 15, 2010

trig
on the same set of axes sketch the graph of f(x)=sin2x and g(x)=2sin x for x (o,180 degrees)
August 1, 2010

Math
PQR ~ STU. PQ = 12cm and ST = 9cm. The area of STU is 72 cm². Find the area of PQR.
July 28, 2010

Chemistry
If 75 g of ice at 0.0 Celsius were added to 1.5 L of water at 75 Celsius, what would the final temperature of the mixture be?
July 27, 2010

MICROECONOMICS
Suppose that two people, Michelle and James each live alone in an isolated region. They each have the same resources available, and they grow potatoes and raise chickens. If Michelle devotes all her resources to growing potatoes, she can raise 200 pounds of potatoes per year. ...
July 25, 2010

college
QuadPlex Cinema is the only movie theater in Idaho Falls. The nearest rival movie theater, the Cedar Bluff Twin, is 35 miles away in Pocatello. Thus QuadPlex Cinema possesses a degree of market power. Despite having market power, PuadPlex Cinema is currently suffereing losses...
July 24, 2010

Math(trig)
Peggy’s Cove Lighthouse, in Nova Scotia, is possibly the most photographed lighthouse in the world. From the observation deck, the angle of depression of a boat is 6º. How far is the boat from the lighthouse, to the nearest metre?
July 21, 2010

Math(trig)
A 10m flagpole casts an 8m shadow at the same time of day as a building casts a 60m shadow. How tall is the building?
July 21, 2010

trig
A 10m flagpole casts an 8m shadow at the same time of day as a building casts a 60m shadow. How tall is the building?
July 21, 2010

PHYSIC
a solid aluminum ingot weighs 89N in air a)what is the volume b)the ingot is suspended from a rope and totally immersed in water. what is the tension in the rope(the apparent weight of the ingot in water)?
July 20, 2010

Calculus
A 15 ft ladder is leaning against a wall.If the top of the ladder slips down the wall at a rate of 5ft/s, how fast will the foot be moving away from the wall when the top is 9ft above the ground.
July 17, 2010

Calculus
Both x and y denote functions of t that are related by the given equation. Use this equation and the given derivative information to find the specified derivative. Equation:35x^2+20y^2=1 Given that dx/dt=4, find dy/dt when (x,y)=(1/7sqrt2, 1/5sqrt2)
July 17, 2010

Calculus
Find f'(x) when f(x)=sin(1/x^3)
July 17, 2010

chemistry
how many grams of NaOH are contained in 250 mL of a 400 M sodium hydroxide solution
July 14, 2010

history
the twenty fifth amendment describes the sequence of events that would install the vice president as acting president against the will of the president. outline that sequence of events
July 9, 2010

chemistry
The vitamin niacin can be isolated from liver, yeast, milk, and whole grain. Which source would be the best for a multivitamin tablet
July 8, 2010

chemistry
The vitamin niacin can be isolated from liver, yeast, milk, and whole grain. Which source would be the best for a multivitamin tablet
July 7, 2010

ap chemistry
purpose three models that explain JJ Thomson's findings and evaluate them? What does this mean? are you suppose to make up your own or look to others?
July 7, 2010

pharmacy
2. On a job interview for a position as a pharmacy technician, the interviewer asks you what a dosage form of medication is. You respond that a dosage form is A. the way a medication is given. B. the use of a medication, either locally or systemically. C. how a medication is ...
July 5, 2010

Pharmacy
Select the abbreviation which means "make". a. a.c. b. b.i.d. c. M d. F I think it's D but I am not sure.
July 5, 2010

chemistry
an aspirin tablet contains 5.00X10^2 mg of active ingredient. how many grams of ap of active ingredient does it contain
July 5, 2010

Calculus
sketch the graph of a function f that is continous everywhere except at x=2, at which point it is continous from the right.Also it is known that f(0)=6 and f(7)=2.
July 4, 2010

kindergarten
you should make cards with easy words on them and make a picture of the meaning of the card. show it , say it and try to see if your baby can say it to . this helps by giving your baby new words to learn at this young age. i hope this helps you.
July 3, 2010

kindergarten
you should make cards with easy words on them and make a picture of the meaning of the card. show it , say it and try to see if your baby can say it to . this helps by giving your baby new words to learne at this young age. i hope this helps you.
July 3, 2010

chemistry
the announced attendance at a football game was 52,806. is this an exact number?
July 2, 2010

chemistry
you have two beakers one filled to the 100 ml mark with sugar and the other filled to the 100 ml mark with water. you pour the sugar and all the water together in a bigger beaker and stir until all the sugar is compeletely dissovlved. what happens to the mass of the solution?
July 2, 2010

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