Tuesday
July 29, 2014

Posts by Kelly


Total # Posts: 1,506

geometry
(12x-15)=(3x+45)

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...

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)

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 co...

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

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)

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^...

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

College Chemistry
What is the oxidation number of (NH4)2SO4

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

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

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=nm...

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 ...

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.

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

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 TE...

chemistry
Determine the oxidation state for the second element in SO3

chemistry
so what wouldit be for Mg3P2? if it has a subscript?

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

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?

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?

College Chemistry
Pb+NO3+Na2SO4-->?

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

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 ea...

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

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

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

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

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

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.

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 ...

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 specif...

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 specif...

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 :)

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?

algebra
Solve P=2L+2W for L. L=

math
what is 6 to the second power

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 h...

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 othe...

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.

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?***

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

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

algebra
solve the equation m-26/5-5m-28/6=2

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"?

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

math
312 yd.

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?

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

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

chemistry
thank you

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

chemistry
how to simplify (x 3-x)/(x-1)?

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 mas...

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...

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 me...

chemistry
that didnt have the right answer i need the steps

chemistry
2.70 g/cm3 to pounds per cubic foot

math
x^4-1/x^3=0

math
cos((sin^-1) 1/2)) sin^-1(sin 7pi/6)

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?

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

math
thank you!

math
12x^2=3x

math
whoops sorry (x-3)(x+3)>0

math
solve of x: (x-3)(x+)>0

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

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

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

college
no you already lost me

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

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?

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

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

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?

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. ...

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....

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?

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?

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?

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)?

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.

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)

Calculus
Find f'(x) when f(x)=sin(1/x^3)

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

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

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

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

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?

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 m...

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.

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

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.

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.

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.

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

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?

Calculus
Find the Limit lim as t approaches 1 of (t^3+5t^2-13t+7)/(t^3-3t+2)

history
What were John f Kennedy's key legislation?

algebra
6x-8y=-16 8y-6x=16

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