Saturday

October 25, 2014

October 25, 2014

Total # Posts: 389

**Chemistry--DR.BOB HELP!**

If 1 volume of 0.1 KH2PO4 is mixed with 2 volumes of 0.1 OHEtNH2 (pka=9.44), what will be the pH of the mixture? I know I know: HH equation
*February 5, 2011*

**biochemistry**

I believe you, correct if I'm not mistaken on part A. The answer is 7.50. for part B: the Base is the amount of initial base minus the amount of base protonated. Maybe Dr.Bob should show us Visually . DR.BOB!!!
*January 21, 2011*

**Math**

a person cleared a rectangular plot of land and covered it with gravel. then he got 9 square wooden sections of side lengths: 2,5,7,9,16,25,33 and 36. by placing the squares on the gravel with no two overlaping, the person built a patio which exactly covered the graveled ...
*December 16, 2010*

**organic chwmistry**

When bromobenzene reacts with propene in a Heck reaction, two constitutional isomers are obtained as a product. Give the structures of the two
*December 8, 2010*

**Physics**

An Olympic swimming pool is heated and maintained at 30 °C in the winter. It has a volume of 2500 m3, a length of 50 m, and a width of 25 m. During a storm, the pool receives 1 cm of rain over its surface area. If the rain is 15 °C, what will the temperature of the ...
*December 5, 2010*

**Physics**

A 1.00-kg beaker containing 2.0 kg of oil (density = 916 kg/m3) rests on a scale. A 2.00-kg block of iron is suspended from a spring scale and is completely submerged in the oil. Find the equilibrium readings of both scales. I was able to find the equilibrium reading for the ...
*December 3, 2010*

**Computer Programing & Logic Design**

.A program that accepts candy data continuously until a sentinel value is entered and displays a list of high-priced, best-selling items. High-priced items are those that sell for $10 per pound or more.
*November 20, 2010*

**Math**

1. Determine the vertex of the parabola: y= 7x^2+14x+6 2. For the following 2 functions,identify the horizontal and vertical asymptotes. a)f(x)= 3x(x-2)/x(x-1) b)g(x)= x/(x+7)^2
*October 31, 2010*

**college math**

the Laplace transform of e^4t(cos 2t)?? please i need help. thanks
*October 27, 2010*

**Math**

The Lappans buy 3 large sandwich wraps to serve at a picnic. 9 people in all will be at the picnic. Show 3 different ways to cut the sandwiches so that each person gets an equal share.
*October 18, 2010*

**Math**

3 neighbors are sharing a rectangular strip of land for a garden. They divide the land into 24 equal sized pieces. What fraction of the land does each person get if they share it equally? Write the answer in more than one way.
*October 18, 2010*

**Math**

The Lappans buy 3 large sandwich wraps to serve at a picnic. 9 people in all will be at the picnic. Show 3 different ways to cut the sandwiches so that each person gets an equal share.
*October 18, 2010*

**stats**

Microbes in a certain colony exposed to radiation have a 1/6 chance of being mutated. a. If ten microbes from the colony are sampled, what is the probability that exactly 4 will be mutated? b. If ten microbes from the colony are sampled, what is the probability that at most 4 ...
*October 16, 2010*

**chemistry honors**

how many grams of a stock solution that is 85% H2SO4 by mass would be needed to make 150 grams of a 45.0 percent solution?
*September 30, 2010*

**Math**

Can the rations 2/18 and 5/45 make a proportion?
*August 9, 2010*

**algebra**

use intrcepts to graph the equation x + 4y = 8
*July 8, 2010*

**algebra**

solve te compound inequality 6 > -5x + 5 or 9 < - 3x + 4
*July 8, 2010*

**algebra**

Find the indicated outputs for f(x) = 2x(2) - 2x f(0), f(1), f(2)
*July 5, 2010*

**english**

Alright thankyou, is there anymore you can find?
*July 5, 2010*

**english**

I need to find rhetorical devices in this speech. -- Pearson’s address on the inauguration of the national flag of Canada: On September 5, 1945 an Order-in-Council was passed declaring the Red Ensign to be Canada's National Flag pending a decision of the Parliament of...
*July 5, 2010*

**calculus**

I need help understanding how the series of e derives into the exponential series using the binomial theorem. Here is a link to a pic of a page in my book, regarding the exponential series: ht tp://i46.tiny pic(.)(com)/qz0oat . jpg (remove parentheses and spaces) A couple of ...
*June 5, 2010*

**calculus**

How can the graph of f(x)=1/2(x+10)^2-2 be obtained from the graph of y=x^2
*May 22, 2010*

**calculus**

How can the graph of f(x)=1/2(x+10)^2-2 be obtained from the graph of y=x^2
*May 22, 2010*

**chemistry**

a sample of gas is collected over water at a temperature of 35 degrees celcius when the barometric pressure reading is 742.0 torr what is the partial pressure of the dry gas?
*May 18, 2010*

**algebra**

1. On three consecutive passes, a football team gains 5 yards, loss 18, and gain 50 yards. What number represents the total net yardage? The total net yardage is 2. -4<=3x-3<=-2 The solution is xl _ <=x<=_? 3. -5<x<=6 What would this answer look like on a ...
*April 26, 2010*

**math**

5+5+1+1 4+4+2+2
*April 23, 2010*

**English**

PLEASE HELP ME WITH THIS!!! GIVE ME A WEB LINK OR SOMETHING GOOD!!! what is being stated in the last long stanza (the third one) of the lyric "If I Ruled the World.!!!!"
*April 20, 2010*

**Global History**

How and why are hate groups protected by the constitution? What actions and speech do you think are not protected and why?
*April 9, 2010*

**College Math**

By looking at two linear equations, how can you tell that the corresponding lines are parallel?
*March 18, 2010*

**Chemistry**

In a titration HCl and NaOH have a 1:1 ratio. Can you still use the formula M1V1 = M2V2 to find the molarity of the NaOH base if we change the acid to sulfuric H2SO4?
*March 4, 2010*

**math**

1. Hot dogs come 10 to a package, and hot dog buns come 8 to a package. What is the smallest number of packages of each that Phillip could buy so that there are no leftover hot dogs or buns? Hot dogs 4 Hot dog buns 5 2. Hamburger patties come 6 to a package, and hamburger ...
*February 21, 2010*

**12th grade**

Pros: It gave more equality, and less discrimation to minorities. (give many examples of this, like it made it illegal to ban minorities from doing anything a white person could do.) It gave further meaning to the philosophy that all man (people in general) are created equal ...
*February 16, 2010*

**physics**

A particle's constant acceleration is south at 2.4 m/s2. At t = 0, its velocity is 43.4 m/s east. What is its velocity at t = 8.0 s? What is the magnitude and direction?
*February 14, 2010*

**Physics**

31.7m/s^2 northeast
*February 12, 2010*

**math **

Are my answers right please? 1. Hot dogs come 10 to a package, and hot dog buns come 8 to a package. What is the smallest number of packages of each that Ms. Evans could buy so that there are no leftover hot dogs or buns? Hot dogs 4 packages Hot dog buns 5 packages 2. ...
*February 10, 2010*

**physics**

Ha Ha !!!
*February 5, 2010*

**science**

can a plant live without water air or sunlight?
*December 16, 2009*

**physics**

I'm sorry I'll stop changing names
*December 13, 2009*

**physics**

A submarine is constructed so that it can safely withstand a pressure of 1.6 x 107 Pa. How deep may this submarine descend in the ocean if the average density of seawater is 1025 kg/m3.
*December 13, 2009*

**algebra**

I'm not sure how to solve this problem, but the answer's -12 e^(x-6)=(1/e^2)^(X+6) Thanks :D
*December 6, 2009*

**4th grade**

why is .4 equal to .40
*December 3, 2009*

**physics**

A box of mass 18.8 kg is pulled to the right with a horizontal force of 9 N. If the box moves to the right with a constant velocity of 1.06 m/s, what is the frictional force acting on the box?
*November 16, 2009*

**Math**

Thanks Ms. Sue. Can anyone help with the second question.
*November 9, 2009*

**Math**

Professional Security Systems purchased 5 dozen dead-bolt lock sets from a manufacturer for $255. If the company's markup rate is 28% of the selling price, what is the selling price of each lock set? Determine the cost ratio (Retail Method) for Twilight Games and Comix ...
*November 9, 2009*

**Physics121**

The back wall of an auditorium is 29.0 m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall?
*November 8, 2009*

**Physic**

i am not learning acoustics...but physics..sorry for the mis-spelling...i am sorry but i dont understand your approach
*November 8, 2009*

**Physic**

The back wall of an auditorium is 29.0 m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall?
*November 8, 2009*

**algebra 2**

5X + 7(5X-14)=-18 5X + 35X-98=-18 40X-98=-18 40X=80 X=2 y=-4 You can check these answers by plugging into the original equations
*November 8, 2009*

**Physic**

A fan at a rock concert is 30 m from the edge of the stage. The sound intensity level at the edge of the stage is 110 dB. The fan's eardrums have a diameter of 8.4mm. How much energy is transferred to each eardrum in one second? (Hint: It may help to asume that the speaker...
*November 7, 2009*

**Physics**

I didnt quite follow ...
*November 7, 2009*

**spanish **

Could also be: Que vas a hacer despues del colegio or que haces despues de la escuela. and como escuela va hasta el momento
*October 30, 2009*

**chemistry.**

Which hydrocarbon pair below have identical mass percentage of C? A: C3H4 and C3H6 B: C2H4 and C3H4 C: C2H4 and C4H2 D: C2H4 and C3H6 E: None of the above My answer is E...Can any one help me?
*September 27, 2009*

**chemistry.**

The molecular of aspartame, the generic name of Nutrasweet, is C14H18O5. The molar mass of aspartame is?
*September 25, 2009*

**English**

Taking a computer home to complete a work-related assignment. Is it ethical or unethical? When an individual takes a job they ensure their employer that they will work their very best, and distribute quality work. By any means the worker is required that they get the assigned ...
*September 12, 2009*

**English**

In my own perspective I believe that deemphasizing negative test results on a product is a very unethical choice. Negative results have an endless limit of problems that can occur. For example, you could put your entire company in jeopardy if you were to hide the negative ...
*September 12, 2009*

**English**

Why deemphasizing negative test results in a report on your product idea is unethical practice?
*September 12, 2009*

**organic chemistry**

Some biphenyl (C6H5-C6H5) is produced as a by-product in the synthesis of benzoic acid. Where does it come from? This question has to deal with the Grignard reaction. Can anyone help me with this please?
*May 27, 2009*

**Chemistry**

Two moles of pure ammonia were injected into a 2.00L flask at a certain temperature. The equilibrium mixture: 2NH3(G)-->N2(G) + 3H2(G) <-- A) What is the value of the equilibrium constant at this temperature? b) how would the number of moles of ammonia be affected if the...
*May 17, 2009*

**Physics**

An ice cube of mass M is placed at rest in on a circular track of radius R, as shown at right. The position of the ice cube along the track follows that of a circle, given by: x^2 + (R – y)^2 = R^2 . A)With respect to the bottom of the track, calculate the potential ...
*May 1, 2009*

**English**

Can someone explain me how to write an essay?
*April 4, 2009*

**Chemistry**

Which element has the following electron configuration: [Xe] 6s^(2) 5d^(1) 4f^(1)
*March 16, 2009*

**Chemistry**

Which electron is, on average, further from the nucleus: an electron in a 3p orbital or an electron in a 4p orbital?
*March 16, 2009*

**Chemistry**

According to the quantum-mechanical model for the hydrogen atom, which of the following electron transitions would produce light with the longer wavelength: 2p --> 1s or 3p --> 1s I have the answer, which is 2p --> 1s, but can someone offer some help as to how this is...
*March 16, 2009*

**business math**

The Kansas City Star on February 16, 2007 reported on the lowering prices of natural gas. With lower natural gas prices and unseasonably warm weather early this winter the forecast is that gas-heating customers will pay $950 as compared to $1,339 last year. At Kansas Gas ...
*March 8, 2009*

**chemistry**

thank you DrBob222!!!
*March 5, 2009*

**chemistry**

what [I-]should be maintained in KI(aq) to produce a solubility of 1.3*10^-5 mol PbI2/L when PbI2 is added?
*March 5, 2009*

**U.S History**

Thanks, you helped me out a lot :)
*February 26, 2009*

**U.S History**

Which factor, self-interest or idealism, was more important in driving American foreign policy in the years 1895-1920? Thanks for the info :)
*February 26, 2009*

**MATH**

What is the area of the region bounded by the lines x=1 and y=0 and the curve y= x(e^x^2)? A. 1-e units squared B. e-1 units squared C. (e-1)/2 units squared D. (1-e)/2 units squared or E. e/2 units squared if you can show me how to get that please
*February 23, 2009*

**Geography**

Which islands on the equator are in the indian ocean?
*January 29, 2009*

**Physics**

Problem 1 (5 Points) In the first application of interferometric methods in radio astronomy, Australian astronomers observed the interference between a radio wave arriving at their antenna directly from the Sun and on a path involving reflection from the surface of the sea. ...
*January 26, 2009*

**need creative picture**

-A picture symbolizing somebody who worries a lot.. I was thinking of a scope like a sniper rifle -A picture symbolizing somebody who helps somebody find their identity -A picture symbolizing somebody who blames themself for another's death
*January 25, 2009*

**accounts**

by giving me the answer
*November 25, 2008*

**accounts**

Stuck Stucky purchased a new truck on July 1, 2005 at a cost of $20,000. The truck had a life of 7 years and salvage of $6,000.00. Using the straight-line method, record the following:- 1. The purchase on July 1, 2005 2. The Depreciation for 2005 3. What is the book value of ...
*November 25, 2008*

**accounts**

1. On January 1, 2004 PEN PENNY received a Utility Bill from BEC for $10,000, the bill was due on February 28, 2004. (a) Show the entries on January 1, 2004 and February 28, 2004. 2. On March 1, 2004 PEN PENNY company borrowed $400,000 from the Royal Bank of Canada and issued ...
*November 25, 2008*

**accounts**

Analyze the transactions and do the following:- 1. Post to T Accounts 2. Prepare a Chart of Account 3. Record in the General Journal 4. Post to the General Ledger 5. Prepare a Trial Balance 6. Prepare a Six Column Worksheet 7. Prepare an Income Statement 8. Prepare a Capital ...
*November 25, 2008*

**English**

how do you paraphrase
*November 24, 2008*

**Physics**

A long uniform rod of length 6.66 m and mass 6.74 kg is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a vertical position as in the figure. Question 1: At the instant the rod is horizontal, find its angular speed. The ...
*October 31, 2008*

**Physics**

i think b is correct.. but what makes "a" incorrect?
*October 13, 2008*

**Chemistry**

A) Find [Zn^2+] and [Fe(CN)6 ^4-] in saturated solution of Zn2Fe(CN)6. B) Repeat the above question in 0.1 mM ZnSO4 saturated with Zn2Fe(CN)6.
*October 4, 2008*

**Chemistry**

How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization ...
*September 16, 2008*

**chemistry**

The aspirin content in the analgesic tablets is determined from 120 samples to have a ean of 250 mg with a standard deviation of 5 mg. from a production line, what percentage of the tablets are expected to contain between 243 and 262 mg of aspirin?What is the 95 % confidence ...
*September 13, 2008*

**chemistry**

The aspirin content in the analgesic tablets is determined from 120 samples to have a ean of 250 mg with a standard deviation of 5 mg. from a production line, what percentage of the tablets are expected to contain between 243 and 262 mg of aspirin?What is the 95 % confidence ...
*September 13, 2008*

**English 92**

analogy for the word hypothermic
*September 8, 2008*

**Chemistry**

How do we add,subtract,multiply or divide the uncertainities of two values? For example 28.0 +- 0.5 and 0.899 +- 0.003 Actually i have to solve this question [log{sq.rt. of (0.104 +- 0.006)}/ (.0511 +- 0.0009)]? Hope u get the question in what manner its written.
*September 5, 2008*

**engineering**

45 MN/900Gg
*September 3, 2008*

**12th grade**

bob i need help paraphrasing
*September 2, 2008*

**Chemistry**

The amount of oxalic acid in a sample was determined by the reaction: 2Fe3+ + H2C2O4 + 2H2O----> 2Fe2+ + 2CO2 + 2H3O+. In an analysis, 10.62g of sample required 36.44 ml of 0.013 M Fe3+. Calculate the %w of oxalic acid in the sample.
*September 1, 2008*

**Chemistry**

A 35ml 0.1M AgCl solution is mixed with 15ml 0.25M MgCl2 solution. Calculate the moles and molarities of the Ag+, NO3-,Mg2+, and Cl- ions in the solution mixture.
*September 1, 2008*

**Science**

Humidity is the amount of water vapor in the air at a given time. At warm temperatures, air can hold more moisture than it can at cold temperatures. Relative humidity is the amount of vapor the air is holding expressed as a percentage of the amount the air is capable of ...
*July 18, 2008*

**Electrochemistry**

aa aer you all bad at chem mannn
*May 16, 2008*

**Physics**

A 10kg block is attached to a massless cord that doesn't stretch or sag which is rapped around a disc like wheel, m=5Kg, I= (1/2)mR^2. If the block is allowed to drop straight down held back only by the rotation of the wheel: 1. What is the tension of the rope? 2. What is ...
*May 11, 2008*

**Health**

I need help on a report on Muscular System!!!!!!!!!!!!!!! P/
*April 21, 2008*

**Maths**

Thank you i kept getting the +6 as a negative time for a break i think
*April 10, 2008*

**Maths**

can someone please help i think i have the solution but i keep confusing myself with negative - negative (maybe i've been staring at it to much 2(3x - 1) - 3(x - 2) = 4x
*April 10, 2008*

**social studies**

mischa
*April 1, 2008*

**math**

i dont understand your posting
*March 31, 2008*

**Algebra**

thats just what i said in my post....you didnt have to repeat my answer
*March 29, 2008*

**Algebra**

you have to convert it and multiply it... -3/4 times 10/1=-15/2 or -7.5
*March 29, 2008*

**Math**

Graph the function x if -2<=x<=3 I know x would be x|-2|-1|0|1|2| But I do not understand how to find y. Can someone tell me how to find the y's?
*March 29, 2008*

Pages: <<Prev | 1 | 2 | **3** | 4 | Next>>