Friday

November 27, 2015
Total # Posts: 668

**AP CHEM**

Complete and balance the reaction Al(s) + Pb2+(aq) ! using the smallest possible integers. I got: 2Al(s) + 3Pb2 ==> Al2Pb3 Calculate the standard free energy. Faraday’s constant is 96485 J V · mol Answer in units of kJ/mol. I know the formula is -nFE but when I ...
*October 21, 2010*

**ap chemistry**

Find the emf for the cell Cr(s) |Cr3+(aq, 0.37 M) || Pb2+(aq, 0.0095 M) | Pb(s). Answer in units of V I got .548733V Is this right?
*October 21, 2010*

**ap chemistry**

I got 8*10^-8 Is this correct?
*October 19, 2010*

**ap chemistry**

A solution is prepared in which a trace or small amount of Fe+2 is added to a much larger amount of solution in which the [OH]- is 1.0M*10^-2. some Fe(OH)2 precipitates. the value of Ksp for the salt is 8.0*10^-10. assuming that the hydroxide ion concentration is 1.0M*10^-2 ...
*October 19, 2010*

**ap chemistry**

would the half reactions for Ag(s) |AgCl(s) |Cl−(aq) || Cl−(aq) |Hg2Cl2(s) |Hg(§¤)be Ag+Cl+e==> AgCl 2Cl+3Hg==>Hg2Cl2+Hg+e
*October 15, 2010*

**ap chemistry**

i am having trouble writing the half reactions and the balanced equation for the galvanic cell Ag(s) |AgI(s) | I−(aq) || Cl−(aq) |AgCl(s) |Ag(s)
*October 15, 2010*

**ap chemistry**

Thank you Dr. Bob. with that information I figured out my question.
*October 15, 2010*

**ap chemistry**

is it a double replacement reaction? 2NaNO3 + Hg2Cr2O7
*October 15, 2010*

**ap chemistry**

what is the galvanic cell for the redox reaction between sodium dichromate and mercury(I) nitrate in an acidic solution.
*October 15, 2010*

**calculus**

Find dy/dx by implicit differentiation. sin x = x (1 + tan y)
*October 14, 2010*

**ap chemistry**

A titration. 12.46 mL of KMnO4 are titrated with 25 mL of H2C2O4. The half reaction is 2H2O+H2C2O4 ARROW 2H2CO3+2H+2e-. How do I get the molarity of H2C2O4? PLEASE HELP
*October 11, 2010*

**ap chemistry**

A titration. 12.46 mL of KMnO4 are titrated with 25 mL of H2C2O4. The half reaction is 2H2O+H2C2O4 ARROW 2H2CO3+2H+2e-. How do I get the molarity of H2C2O4? PLEASE HELP
*October 11, 2010*

**chemistry**

Calculate the molarity for 25mL of H2C2O4 in a titration with 12.46mL of KMnO4
*October 11, 2010*

**Chemistry**

Assignment Calculate the pH, pOH, [H+], and [OH] for each of the following solutions. Show all work. (10 Points) Solution Composition of Starting Materials 1 0.10 M acetic acid 2. 5 mL 0.10 M acetic acid + 5 mL wa 3 1 mL 0.10 M acetic acid + 99 mL water 4 5 mL...
*October 11, 2010*

**communication**

the answer is c
*October 7, 2010*

**Physics**

rry leaves home at 4:07 and runs at a constant speed to the lamppost. He reaches the lamppost at 4:11, immediately turns, and runs to the tree. Larry arrives at the tree at 4:22. What is Larry's average velocity during his entire trip, if the lamppost is 363.0 m west of ...
*October 5, 2010*

**algebra word problem**

the difference between 2 numbers is 24. find the numbers if their sum is 88
*October 4, 2010*

**chemistry**

50.0 mL of water is heated from 60 C to 85 C. How much heat was absorbed by the water sample in joule Can anybody help me understand the process or rules to figuring this out? Thanks
*October 3, 2010*

**ap chemistry**

At normal temperature and pressure, air has a density of 0.001184 g/mL. What is the mass of air in a room that is 3.74 m by 3.45 m by 3.93 m? Answer in units of kg.
*October 1, 2010*

**ap chemistry**

Th solution has a density of 1.049g/mL and only 40% of the solution is acetic acid
*October 1, 2010*

**ap chemistry**

i came up with the answer of 419 g
*October 1, 2010*

**ap chemistry**

Calcu- late the mass of pure acetic acid in 440 mL of this solution at 20 C. Answer in units of g.
*October 1, 2010*

**Chemistry**

How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products? Consider the following reaction: 4HCl(g)+ O2(g)to 2H2O +2Cl2(g)
*September 28, 2010*

**Math broadmoor**

1 2 3 4 5
*September 23, 2010*

**Accounting**

It is stand accounting procedures, or GAAP, to make an adjusting entry to remove the current year’s principle from the long-term liabilities. This entry reduces the long-term liabilities and increases the current liabilities. You are the bookkeeper for Biker’s ...
*September 20, 2010*

**Physics**

A jetliner can fly 6.50 hours on a full load of fuel. Without any wind it flies at a speed of 2.15 102 m/s. The plane is to make a round-trip by heading due west for a certain distance, turning around, and then heading due east for the return trip. During the entire flight, ...
*September 19, 2010*

**math**

describe a real life situation that can be represented by the following: A - (B U C) The U is a union symbol
*September 17, 2010*

**Math**

write 128 in each of the following bases A) five B)two C)twelve
*September 17, 2010*

**Math**

Where do the parentheses go in this equation? 8+3x6-4-1=13?
*September 17, 2010*

**chemistry**

2408
*September 15, 2010*

**math**

i need help on doing 442 mi in 8.5 hr and i dont know how to do it can you help me?
*September 14, 2010*

**Physics**

at what velocity would a snowball melt before it hit the wall at 32 degrees?
*September 14, 2010*

**Math**

call your tutor rather than trying to get someone else to do your course work for you
*September 14, 2010*

**health**

Case Study â€“ Memorial Health System CPOE Implementation Identify at least five indicators of project failure that manifest themselves in this case study. 2. For each of those indicators, describe what you might have done differently to eliminate or minimize ...
*September 13, 2010*

**health**

this is the case study and instead of the landor one i put lack of involvment Case Study â€“ Memorial Health System CPOE Implementation Memorial Health System is an eight-hospital integrated health care system in the Midwestern United States. The health system ...
*September 13, 2010*

**health**

Identify at least five indicators of project failure that manifest themselves in this case study. Are these right ? these are a few i have came up with: organized inertia lack of clarity of pupose lack of landor project status report insufficient leadership support
*September 13, 2010*

**chemistry**

fhdjfhsghjbfdhfegkfh,nbngdbhhfbebfgbhbgherhfjhge aka IONO
*September 12, 2010*

**Science **

in plants the process that happens when sugars break down and give off energy is called
*September 8, 2010*

**Science**

Why do we name hurricanes?
*September 7, 2010*

**Science**

Why do we name hurricanes?
*September 7, 2010*

**math**

xy = 8 y = x + 2
*September 6, 2010*

**math**

solve algebraically x^2 - 2y^2 = 11 y = x + 1
*September 6, 2010*

**math**

simplify 3sqrt-1/8
*September 5, 2010*

**Division**

3y-18/35 divided by y-6/15y
*September 5, 2010*

**math**

You make $ 90000 a year, and you get a 10% raise. Your new salary is $ .??? The next year you get a 10% cut. Your new salary is $ ????. That is ??? % less than your initial salary. How would I go about solving this??
*August 26, 2010*

**college physics**

double the height of H
*August 24, 2010*

**math**

make A 14 dot array that has exactly 2 rows
*August 19, 2010*

**Algebra II**

Two algebra II questions... simple, i believe? give a numerical example to show that subtraction is not commutative. and give a numerical example to show that subtraction is not associative. thanks(:
*August 18, 2010*

**Physics**

A scientist has devised a new method of isolating individual particles. He claims that his method enables him to detect simultaneously the position of a particle along an axis with a standard deviation of 0.12 nm and its momentum component along the axis with a standard ...
*August 16, 2010*

**Physics**

Please help me solve this! The spectrum of the sodium atom is detected in the light from a distant galaxy. If the 590.0 nm line is redshifted to 658.5 nm, at what speed is the galaxy receding from the Earth?
*August 11, 2010*

**Physics**

(a)Assuming that only gravity is acting on it, how far does an electron have to be from a proton so that its acceleration is the same as that of a freely falling object at the Earth’s surface? (b)Suppose the Earth were made up only of protons but had the same size and ...
*July 29, 2010*

**chemistry**

I'd like to know the answer! haha
*July 16, 2010*

**Finance**

On this problem, theres one thing holding me up. $3 = $1(1 + r)^(12/3) What is r? I cant get it. I even had a sample problem along the same lines and couldnt get that on.
*July 10, 2010*

**Finance**

Suppose an investment offers to triple your money in 12 months (don't believe it). What rate of return per quarter are you being offered?
*July 10, 2010*

**Finance**

You have just won the lottery and will receive $1,000,000 in one year. You will receive payments for 30 years, which will increase 5 percent per year. The appropriate discount rate is 8 percent. What is the present value of your winnings?
*July 10, 2010*

**physics**

I'm having trouble with question 2, please help The velocity of an object in simple harmonic motion is given by v(t)= -(0.275 m/s)sin(23.0t + 2.00π), where t is in seconds. 1) What is the first time after t=0.00 s at which the velocity is -0.100 m/s? 2) What is the ...
*June 13, 2010*

**Physics**

Thanks, I see how it's done. For question 2, I did: x = dv/dt = 0.275*cos(23t) = 0.275*cos(0.372rad) = 0.256 m which is incorrect for some reason.
*June 12, 2010*

**Physics**

The velocity of an object in simple harmonic motion is given by v(t)= -(0.275 m/s)sin(23.0t + 2.00π), where t is in seconds. 1) What is the first time after t=0.00 s at which the velocity is -0.100 m/s? 2) What is the object's position at that time? I tried solving ...
*June 12, 2010*

**Physics**

Nevermind I figured it out... :)
*June 12, 2010*

**Physics**

Two blocks of masses M and 5M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them, as seen in the figure below: img404.imageshack.us/img404/8349/sbpic0906.png 1) A cord ...
*June 12, 2010*

**math**

I appreciate all of your help. We had about 77 of these problems to do. These are the LAST two problems that I need some help on. Thank you so much for everything. 1/x-1 minus 2/x^2-1= -1/2 2/y plus y-1/3y= 2/5
*May 1, 2010*

**Math**

I appreciate all of your help. We had about 77 of these problems to do. These are the LAST two problems that I need some help on. Thank you so much for everything. 1/x-1 minus 2/x^2-1= -1/2 2/y plus y-1/3y= 2/5
*May 1, 2010*

**math**

Thank you!!
*May 1, 2010*

**math**

solve each equation: x over x+1 plus 2= 3x over x+2
*May 1, 2010*

**math**

Thank you!!
*May 1, 2010*

**math**

Solve each equation: 11/3v+2 minus 3/4= 5 over 3v+2
*May 1, 2010*

**math**

I appreciate your help. This is the last problem that I need help with today. The answer is suppose to be -1/4 3x/x+1=5x over x-1 -2
*April 30, 2010*

**math**

Solve the equation: Thank you 2/y + y-1/3y= 2/5
*April 30, 2010*

**math quick?**

5 over 2x-5 minus 4 over 5= 1 over 2x-5 I have a quick question... what would i multiply by? I know how to do the rest of the problem. Thank you
*April 30, 2010*

**Math**

Solve each equation: Thank you 5-x over 3 minus x-2 over 4 = 5/12
*April 30, 2010*

**Math**

Thank you I was able to do this problem.
*April 30, 2010*

**Math**

Solve each equation: 5 over 2x-5 minus 4/5= 1 over 2x-5
*April 30, 2010*

**math**

wats 4 divided by 137
*April 28, 2010*

**Finance**

I have a number of questions for a finance assignment that is meant as a review for our final. However my final is being written earlier than the rest of the class so the answers aren't up yet. I was hoping someone could answer two or three of the questions so that I can ...
*April 19, 2010*

**social studies**

americans are united by their strong belief in basic principles.they believe that people are born with privileges that cannot be taken away from them.these are
*April 14, 2010*

**economics**

state the effects of unemployment on the (A)consumers expenditure (b)investment (c)Government expenditure (D)The church.
*April 9, 2010*

**math**

A developer plans to build houses around lake okeebele. Most of his customers want to buy about 100 feet of lakefront. How many lots can the developer build around the lake? scale 100 feet=10,000 square feet
*April 5, 2010*

**MATH**

The triangular numbers are the numbers 1, 3, 6, 10, 15, . . .; the square numbers are the numbers 1, 4, 9, 16, 25, . . . The pentagonal numbers 1, 5, 12, 22, 35, . . .. The geometrical language is justified by the following diagrams: a. What are the first five hexagonal ...
*April 2, 2010*

**math**

ok this one is PHUN after the flea jumps on the rubberband, everytime the rubberband stretches the flea gets pulled along, as a rubberband stretches, part of it moves towards the object stretching it Thus each time the roo jumps the flea is pulled along a little bit... Thus ...
*April 1, 2010*

**math**

what is the eighth term of the sequence of the expression:5(n+2)?
*March 18, 2010*

**art**

why did kenneth clarks interpretation of the aferican mask is ethnocentric
*March 12, 2010*

**Chemistry**

Given an unknown mixture consisting of two or more substances explain one technique that could be used to determine whether that mixture is a true solution a colloid or a suspension
*March 11, 2010*

**Organic Chem**

4-nitro-veratrole
*March 2, 2010*

**social studies**

what are the three main types of resourses used for making,selling,and using goods and services?
*February 23, 2010*

**English**

What pronoun is used for the "Empire State Building"?
*February 15, 2010*

**algebra 2**

what are the real solutions of 750=x^3-15x^2+50x
*February 1, 2010*

**algebra 2**

what are the real solutions of 750=x^3-15x^2+50x
*February 1, 2010*

**Math**

A small business decides to lower the salaries of its employers by $8,250 over a year. To do this, all of the 15 employeers will have their salaries reduced by equal dollar amounts for the year. What is the pay-cut of each employee over the year? Answer is suppose to be $550
*January 27, 2010*

**algebra 1-2**

The sum of two numbers is 73. Their difference is 21. Find the larger number.?
*January 20, 2010*

**earth Science**

When a river is lengthened due to forward erosion, a _____ has occurred.
*December 25, 2009*

**Elementary Algebra**

when working the following equation, I came up with 0/4. Would the final outcome be 0? Here is the equation. 2x+3/4, and here is what I came up with.=2x+3/4=0/4=0
*December 18, 2009*

**math**

You have 75 employees, 1/6th of them retired, and 1/4 of them left the company for new jobs. how many employees did you have in the begining?
*December 18, 2009*

**Computers**

LAN is an acronym for "Local Area Network" and WAN is "Wide Area Network"
*December 14, 2009*

**Physics**

Two small loudspeakers that are 5.50 apart are emitting sound in phase. From both of them, you hear a singer singing C# (frequency 277 ), while the speed of sound in the room is 340 . Assuming that you are rather far from these speakers, if you start out at point equidistant ...
*December 12, 2009*

**math/probability**

If two fair dice are rolled, find the probability of a sum of 6 given that the roll is a "double". How do I do this?
*December 7, 2009*

**probability/math**

Three cards are drawn without replacement from an ordinary deck of 52 playing cards. What is the probability that the second and third cards are kings if the first card was not a king?
*December 7, 2009*

**AP Physics**

Assume that at sea-level the air pressure is 1.0 atm and the air density is 1.3 kg/m3. (a) What would be the height of the atmosphere if the air density were constant? 7.919 km (b) What would be the height of the atmosphere if the air density decreased linearly to zero with ...
*December 3, 2009*

**to bobpursley**

In my heads/tails question- why isn't it 1/6? I flip a coin three times, aren't there only 6 possible outcomes?
*December 1, 2009*

**math**

what are the odds in favor of getting at least one head in three successive flips of a coin? I need to know the formula on this. I have 1/6 over 1- 1/6. But I can't figure out how to do the math. Am I right?
*December 1, 2009*

**math**

Lead Contamination More than a decade ago high levels of lead in the blood put 88% of children at risk. A concerted effort was made to remove lead from the environment. In a random sample of 200 children taken more than a decade ago, what is the probability that 50 or more had...
*November 20, 2009*