Saturday

February 13, 2016
Total # Posts: 1,396

**Chemistry**

Choose the two half-reactions from a table of standard reduction potentials that most closely approximate the reaction that occur within the battery (Pacemaker). What is the standard voltage generated by a cell operating with these half-reactions? (i got +3.85V). The actual ...
*May 7, 2011*

**Chemistry**

Thank you so much
*May 7, 2011*

**Chemistry**

What is the half-cell reactions in a hydrogen fuel cell, and calculate the standard voltage at 25°C H2(g)+ O2(g)------>2H2O(l)
*May 7, 2011*

**Chemistry**

Choose the two half-reactions from a table of standard reduction potentials that most closely approximate the reaction that occur within the battery. What is the standard voltage generated by a cell operating with these half-reactions? 2Li(s) + Ag2CrO4(s) --------> Li2CrO4(...
*May 7, 2011*

**Chemistry**

Heart pacemakers are often powered by lithium-silver chromate “button” batteries. The overall cell reaction is: 2Li(s) + Ag2CrO4(s) --------> Li2CrO4(s) + 2Ag(s) Lithium metal is the reactant at one of the electrodes of the battery. Is it the anode or the cathode?
*May 7, 2011*

**Chemistry**

Thank you very much. This helps a great deal
*May 7, 2011*

**Chemistry**

Explain with values and reactions from standard reduction potentials tables why neither gold (I) nor gold (III) not to mention the base metal itself, tarnishes (that is can be oxidized by exposure to air)
*May 7, 2011*

**Chemistry**

How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s
*May 6, 2011*

**Chemistry**

How much energy in KJ is release to form one mole of 123Sb from protons and neutrons if the atom has a mass of 122.90422 amu? Please remember to include the mass of electrons in calculations.
*May 6, 2011*

**Chemistry**

A rock containing 238U and 206Pb was examined to determine its appropriate age. The molar ratio of 206Pb to 238U was 0.1462. Assuming no lead was originally present and that all lead formed remained in the rock. What is the age of the rock in years? The half life of 238U is 4....
*May 6, 2011*

**Statistics**

Hi I am a college student in wireless technology but am only very sketchy on statistics. I'm am trying to write a program to tell me if activity is unusual. I can read the activity of a person from a motion detector from day to day i.e. mon activity - 250 times tues - 300 ...
*May 6, 2011*

**geometry**

Jackson is creating a water garden surrounded by a triangular patch of grass. If the pond will take up the space indicated by the circle, how many square feet of sod will he need to complete the garden (use 3.14 for and round your answer up to the next foot)?
*May 4, 2011*

**math**

16 = 16x^2 - 64x + 64 0 = 16x^2 - 64x + 64 - 16 (using quadratic formula) x= 3 or x =1
*May 3, 2011*

**Math**

Anyone help?
*May 2, 2011*

**Math**

What other post?
*May 2, 2011*

**Math**

Can someone guide me with this question? Four teachers and five students have volunteered to serve on the school's fundraising committee, which is chaired by the principal. The principal wishes to select the committee using a random draw. He places each person's name ...
*May 2, 2011*

**Math**

Should I create a grid 6 by 5? :S
*April 27, 2011*

**Math**

faizel wants to travel from his house to the hardware store that is six blocks east and five blocks south of his home. If he walks east and south, how many different different routes can he follow from his house to the store? Can somebody help me setup this question? I don'...
*April 27, 2011*

**Math**

Find the instantaneous rate of change for the function at the given value. f(x)=x^2+2x at x=-4
*April 27, 2011*

**Math**

Using the arrangement of letters in the margin, compute the number of paths that spell the word MATHEMATICS if all paths must start at the top and move diagonally down through the letters. M A A T T T H H H H E E E M M M M A A A T T I I I C C S I only got up to E E E, I don&#...
*April 26, 2011*

**Calculus**

Could someone work this out so I understand it. Thanks Given the supply function p=S(x)=5(e^0.02x-1) Find the average price (in dollars)over the supply interval [31,36] The 0.02x in the only thing ^ on the e
*April 25, 2011*

**History**

how trading helped sparta economy?
*April 25, 2011*

**world history**

The Europeans desire for profit affected the people of Congo by taking away their freedom, forcing them into slavery, taking away their customs, affected the economy etc.
*April 24, 2011*

**Chemistry**

The vapor pressure of water at 95C is normally 6.33.9 but decreased to 561.2mmHg upon addition of an unknown amount of NaOCl to 164.3g of water at this temp. How many grams of NaOCl was added assuming complete dissociation of the solute
*April 23, 2011*

**Chemistry**

I followed this procedure but i was told the answer was incorrect. Any help would be appreciated.
*April 23, 2011*

**Chemistry**

Oh just kidding after much frustration and stepping away from the problem and coming back, I noticed that I messed up the density in my conversion. I had the right idea I just had to correct my mistake and then continue on with the molar mass of CaF2, then I divided 4 ...
*April 18, 2011*

**Chemistry**

Calcium fluoride is the well-known mineral fluorite. It is known that each unit cell contains four Ca2+ ions and eight F- ions and that the Ca2+ are arranged in a face-centered cubic lattice. The F- ions fill all the tetrahedral holes. The edge of the CaF2 unit cell is 5.46295...
*April 18, 2011*

**Math**

Can someone help me verify if this is correct? Gasoline usage for compact cars in Canada is a normal distribution with a mean of 33.3 km/l and with standard deviation of 7.3 km/L. Round your answers to one decimal place. a) What percentage of compact cars obtains 20km/L or ...
*April 17, 2011*

**Math**

anyone?
*April 17, 2011*

**Math**

Can someone help me verify if this is correct? Gasoline usage for compact cars in Canada is a normal distribution with a mean of 33.3 km/l and with standard deviation of 7.3 km/L. Round your answers to one decimal place. a) What percentage of compact cars obtains 20km/L or ...
*April 17, 2011*

**Math**

She added 4, multiplied the sum by -5, and subtracted 12. She then doubled the result and got -34. What number did Christa started with?
*April 14, 2011*

**social studies**

what was one of the increased use of the assembly line in the 1920's?
*April 11, 2011*

**geography**

what would happen if wheat was no longer a resource to the U.S.?
*April 4, 2011*

**Physics**

A 7.80-g bullet moving at 590 m/s penetrates a tree trunk to a depth of 4.8 cm. Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.
*March 24, 2011*

**chemistry**

for an exotherimic reaction incresing the reaction temperature results in a (n)___k ?
*March 22, 2011*

**chemistry**

given reaction at equilibrium, if Kp=1.05 at 250 degree celcius, then kc =
*March 22, 2011*

**algebra**

8000, because 1m=100cm. You take the 100m/5cm=20 cubes. V=LxWxH. 20x20=400x20=8000
*March 20, 2011*

**physics**

The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. The mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What is the work done by the block and tackle ...
*March 17, 2011*

**Physics**

.455
*March 15, 2011*

**Geometry **

(20^2-7^2) = 351 sqrt of 351 = 18.7
*March 9, 2011*

**Geometry **

Find the length of the altitude of an isosceles triangle if one side has a length of 20 ft and a base of 14 ft?
*March 9, 2011*

**English**

Yeah but the entire essay is a narration, and in my question I had to pick out the thesis for both Frazier and his narrator. So I had to find in the essay where Frazier interjects his own thesis.
*March 8, 2011*

**English**

I am between two different thesis statements for Frazier either it is where the writing becomes italicized, "Remember to keep shower curtain inside tub at all times!" Or In the last paragraph from Operating the shower curtain is kind of tricky to there is no need ...
*March 8, 2011*

**English**

Within this I have another question. I am between two different thesis statements for Frazier either it is where the writing becomes italicized, "Remember to keep shower curtain inside tub at all times!" Or In the last paragraph from Operating the shower curtain is ...
*March 8, 2011*

**English**

Help! In Ian Frazier's essay How to Operate the Shower Curtain, what problems are users likely to encounter in using the shower curtain?
*March 8, 2011*

**Physics**

An electron is accelerated through 2200 V from rest and then enters a region where there is a uniform 1.30 T magnetic field directed perpendicularly to the electron's velocity.
*March 7, 2011*

**math**

6 + 3
*March 7, 2011*

**math**

A computer technician charges $40 for a house call and $38 per hour. The expression 40 + 38t is used to find the cost of a house call that lasts t hours. What is the cost of a house call that last 3 hours?
*March 7, 2011*

**math**

A phone compant uses the expression 1.25 + 0.10m to calculate the cost of a phone call that lasts m minutes. What is the cost of a call that last 20 minutes?
*March 7, 2011*

**Calculus 12th grade (double check my work please)**

2 and 3 are right. the first one is a trick question. It is a circle, so the tangent line is always 90 degrees to the radius
*March 6, 2011*

**Algebra**

Factor 2xsquared minus 5x minus 3.
*March 5, 2011*

**Business Communications**

Thank you, my understanding of when or where to use Ms. was wrong.
*March 5, 2011*

**Business Communications**

5: You are attending a professional conference and are privileged to be introduced to Caroline Peters. You know nothing about her except that she is an executive at a very successful company. You have and idea that you would like to talk over with her. How should you address ...
*March 5, 2011*

**algebra**

solve using the elimination method x+7y=58 -x+4y=30
*February 27, 2011*

**English**

Please find errors and correct them. To all ABC Internet Customers we have resolved the problem we were having with the Internet backbone for Southern Illinois. There was an NAP connection that was having trouble in Atlanta, Georgia. This is been resolved. The speed is much ...
*February 24, 2011*

**ENGLISH**

I am confussed as where to put the comma at tht you stated in the first sentence.
*February 24, 2011*

**7th grade math**

the perimeter of a rectangle is 125cm. its length is 3x and its width is 2x. what is x.
*February 23, 2011*

**math**

how do i put that in a equation form?
*February 22, 2011*

**math**

The quotient of h and -6 is at least 5.
*February 22, 2011*

**math**

The product of a number and 7 in not less than 21.
*February 22, 2011*

**math**

tom saved $550 to go on a school trip. the cost for a hotel room, including tax, is $80 per night. write and inequality to show the number of nights tom can stay at the hotel.
*February 22, 2011*

**math**

dante has at most $12 to spend on entertainment each week. so far this week, he spent $7.50. Write and solve an inequality to determine how much money dante can spend on entertainment the rest of the week.
*February 22, 2011*

**math**

dante has at most $12 to spend on entertainment each week. so far this week, he spent $7.50. Write and solve an inequality to determine how much money dante can spend on entertainment the rest of the week.
*February 22, 2011*

**math**

the rope James bought with his camping gear is 54 inches long. james needs to cut shorter pieces of rope that are 18 inches long. what are the possible number of pieces james can cut?
*February 22, 2011*

**math**

the gas tank in bob's car holds at most 15 gallons. He has already filled the tank with 7 gallons of gas. he will continue to fill the tank with g gallons more. Write and solve an inequality that shows all the values of g that bob can add to the cars tank.
*February 22, 2011*

**Chem **

22.8 kg of a metal has a density of 8.3g/mL. Calculate the volume of the metal sample?
*February 22, 2011*

**physics**

sqrt(1/8)=ans
*February 21, 2011*

**algebra **

A peddler is taking eggs to market to sell. The eggs are in a cart that holds up to 500 eggs. If the eggs are removed from the cart 2, 3, 4, 5,or 6 at a time, one egg is always left over. If the eggs are removed 7 at a time, no eggs are left over. How many eggs are in the cart.
*February 19, 2011*

**Stats**

I Have no idea
*February 18, 2011*

**math**

Explain how you can multiply 3 times 24 by using arrays. Then give the product.
*February 17, 2011*

**Algebra**

What are the solutions of the quadratic equation below? 4x2 - 30x + 45 = 0
*February 17, 2011*

**math**

Ricky has a total of 64pennies and quarters in a jar.He has 34 more pennies than quarters.How much money does ricky have in the jar.
*February 15, 2011*

**math**

If Juan can consume in one sitting one medium (12-inch diameter), deep-dish (1-inch thick) pizza, what is the minimum volume of his stomach?
*February 14, 2011*

**math**

The year 1991 was the last year of the twentieth century whose number is a palindrome, that is, reads the same backward and forward. How many years between the years 2000 and 3000 will be palindromic?
*February 14, 2011*

**geography**

in which country khmer rouge establish a brutal regime?
*February 13, 2011*

**physics**

A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 3.2 m/s. The acceleration of gravity is 9.81 m/s 2. What is the initial height of the bob?
*February 11, 2011*

**algebra**

In the lab, Jessica has two solutions that contain alcohol and is mixing them with each other. She uses times as much Solution A as Solution B. Solution A is alcohol and Solution B is alcohol. How many milliliters of Solution B does she use, if the resulting mixture has ...
*February 11, 2011*

**math**

mr.king, the owner of good morning groceries, wants to make a fence aea to put his carts in at night.he has 68 feet of fencing.what is the largest rectangular area he can fence? ( use only whole numbers)
*February 10, 2011*

**physics**

How fast (in rpm) must a centrifuge rotate if a particle 14.0 cm from the axis of rotation is to experience an acceleration of 70,000 g's?
*February 10, 2011*

**physics**

An electron and a proton are separated by 2.0 nm. (a) What is the magnitude of the force on the electron? (b) What is the net force on the system?
*February 10, 2011*

**algebra**

According to the world almanac, in 1990 there were 41,223,804 students enrolled in full-time day schools and there were 2,397,351 classroom teachers for these students. On average, how many pupils were there per teacher? Round answer to the nearest tenth.
*February 8, 2011*

**Algebra**

A revolving restaurant rotates one complete turn every 56 minutes. In the 21 minutes it takes to eat the peaches jubilee dessert, through how many degrees does the restaurant revolve?
*February 8, 2011*

**match**

the sum of two times a number and 5 is 11? equation form.
*February 8, 2011*

**Business and Administrative Communications**

Just wanted to say thank you very much for your help to Writeacher. I made a 95 on my test. Thanks again.
*February 5, 2011*

**Business and Administrative Communications**

Thank you so much. I greatly appreciate it.
*February 5, 2011*

**Business and Administrative Communications**

Ok, here is my corrected answers. #3: A #4: A #8: D #9: B
*February 5, 2011*

**Business and Administrative Communications**

I forgot the rest of the question on Num. 6. "Hush little baby," my grandfather would often whisper softly to me, "Don't say a word." ("Don't say a word." is underlined) thank you. I'm still thinking on the others.
*February 5, 2011*

**Business and Administrative Communications**

I am just not sure about these questions. Any help is greatly appreciated. 1: Identify the sentence with correct subject-verb agreement. A: Although the trend is shifting, careers in science and technology continue to attract predominately men. B: Although the trend is ...
*February 5, 2011*

**Algebra 2**

The purity of gold is measured in karats. Twenty-four karat gold is pure gold and k karat gold is k/24 gold by mass. One piece of 16-karat gld jewelry has a mass of 30 grams and another piece of 10-karat gold jewelry has a mass of 40 grams. Find the number of grams in the ...
*January 30, 2011*

**Algebra**

What is the probability that a randomly selected three-digit number is divisible by 5? Express answer as a common fraction.
*January 26, 2011*

**math**

I need help with my math work
*January 24, 2011*

**math**

can some please solve everyone because i do get it. 102,105,111,114,120,123,129,_,_,_,_,_, 201,204,210,213,219
*January 24, 2011*

**math**

can some please solve everyone because i do get it. 102,105,111,114,120,123,129,_,_,_,_,_, 201,204,210,213,219
*January 24, 2011*

**math**

102,105,111,114,120,123,129,_,_,_,_,_, 201,204,210,213,219 is not +3+6+3+6 TRY it yourself
*January 24, 2011*

**Math**

+3+6 is wrong
*January 24, 2011*

**Math**

102,105,111,114,120,123,129,_,_,_,_,_, 201,204,210,213,219
*January 24, 2011*

**math**

the formula P= 2L+2W can be used to calculate the perimeter of a rectangle. A regtangular swimming pool has a length of 50 meters and a width of 25 meters. What is the perimeter of the swimming pool
*January 20, 2011*

**Math**

A farmer has some chickens and some goats. Altogher there are 43 heads and 108 legs. How many chickens does the farmer have? How many goats does the farmer have?
*January 18, 2011*

**expository composition**

write about what is friendship.why is frienship important
*January 18, 2011*

**Pre-Calculus**

O thanks for the tip. New here. Well and friend helped me figure out 1 and 2 since they were basically the same question. I found out that I had trouble actually doing the algebra once I had the equations. But I'm still a little confused on how to set up number 3.
*January 13, 2011*