Wednesday

February 22, 2017
Total # Posts: 297

**chemistry**

The vapor pressure of ethanol is 54.68 mm Hg at 25oC. How many grams of chlorophyll , C55H72MgN4O5, a nonvolatile, nonelectrolyte (MW = 893.5 g/mol), must be added to 207.6 grams of ethanol to reduce the vapor pressure to 53.60 mm Hg ? ethanol = CH3CH2OH = 46.07 g/mol.

*August 26, 2014*

**chemistry**

calculate the Henry's law proportionality constant for N2? partial pressure at 1 atm=0.78 atm solubility at 1 atm= 5.3 x 10^-3 mol/L

*August 25, 2014*

**chemistry**

what is the solubility of N2 at a pressure of 10 atm? partial pressure at 1 atm=0.78 atm solubility at 1 atm= 5.3 x 10^-3 mol/L

*August 25, 2014*

**chem**

at a depth of 100m underwater the water pressure is equal to 10 atm of pressure. what is the partial pressure of N2 at a pressure of 10 atm?

*August 25, 2014*

**chemistry**

A 35.0g sample of ethylene glycol is dissolved in 500.0g of water. The vapor pressure of water at 32C is equal to 35.7mm Hg. What is the vapor pressure of the water-ethylene glycol solution at 32C?

*August 24, 2014*

**chemistry**

The concentration of CO2 in an unopened soda can is 0.0506 m at 25 C. What is the partial pressure of CO2 gas in the can?

*August 24, 2014*

**chemistry**

The partial pressure of O2 in your lungs varies from 25 mm Hg to 40 mm Hg. What mass of O2 can dissolve in 1.0L OF water at 25.0oC when the O2 partial pressure is 40. mm Hg?

*August 24, 2014*

**math**

Certain investments compound interest at different intervals. What effect does the size of the compounding interval have on the yield of the investment?

*June 30, 2014*

**Math**

How to sketch a visual model to find the total distance that Luke rode.

*April 22, 2014*

**math**

100 eighth grade students were interviewed about their favorite subject at school. 45 said Math, 70 said English, and 5 said neither. Using a Venn diagram, how many said both?

*March 10, 2014*

**government**

same government

*September 22, 2013*

**math**

(a)Given the points P(3,5),Q(8,10)and R(8,0),find the equation of a line which is perpendicular to QR and passes through the mid point of QR. (b)The line 2x+3y=2 and 7x-3y=10 intersect at A . Find the equation of the line which passes through A and is perpendicular to the line...

*June 5, 2013*

**physics**

plz help

*June 5, 2013*

**Physics/Mechanics**

plz help

*June 5, 2013*

**chemistry**

how many moles of nh3 are produced from 16 grams of n2 ?

*May 21, 2013*

**CHEM-PLEASE HELP**

1- Calculate the equilibrium concentration for H+, HSO4- and SO4^2- , given a .150M H2SO4 solution. the Ka for HSO4- is 1.20*10^-2

*May 20, 2013*

**CHEM HELP PLEASE**

1- the vinegar soltion sold in the store is about 5% acetic acid. Assuming that the solution has a density of 1.01 g/mL, calculate the pH of vinegar.

*May 20, 2013*

**physics**

Q 4_1? 4_2? 4_3? plz help.

*May 17, 2013*

**physics**

problem E2_2 Strain, boundary conditions, displacement and elongation: Part I Plz help.

*May 11, 2013*

**stoichiometry**

what is the mole ratio of oxygen to water

*May 7, 2013*

**Physics**

plz help problem 4_1?

*April 30, 2013*

**Physics**

thanks regz.

*April 30, 2013*

**Physics**

E2_2: E2_3: PLZ help

*April 30, 2013*

**Physics**

3_2(a) 3_2(b) plz help.

*April 30, 2013*

**Physics**

problem3_1 second part, Obtain the numerical value of the displacement of section c....! plz help?

*April 30, 2013*

**LA**

that was so mean

*April 11, 2013*

**physics**

A spherical bowling ball with mass m = 4.1 kg and radius R = 0.116 m is thrown down the lane with an initial speed of v = 8.9 m/s. The coefficient of kinetic friction between the sliding ball and the ground is ¦Ì = 0.34. Once the ball begins to roll without ...

*March 18, 2013*

**physical**

a car a starts from rest 305kg increase its equal to 10m/s in 2 second

*March 8, 2013*

**english**

Where will I put the quotation in the sentence: I said that I might have left my book in Math class.

*February 25, 2013*

**social studies**

in what ways could the natural barrier of the himalayas have both helped and hurt the cicilization of the indus river valley

*February 5, 2013*

**Help please!!health**

After a meal at a child care center ,the left over hot food that has been in serving bowls that have been on the table should be: a.chilled, refrigerated and used at another meal b.reheated, cooled and frozen for later use c.discarded d.heated in a microwave oven before using ...

*December 13, 2012*

**Help Please!! Health**

Which one of the following major concepts is NOT included in the conceptual framework on which education nutrition is based? a.nutrition is how the body uses food b.food is composed of nutrients required for health c.every person needs a variety of nutrients throughout life d....

*December 13, 2012*

**grammar**

can you tell me if sentence or not. 1the women made a cup of coffee. 2An addiction she had since her teen years. 3Never before starting her work day without coffee. 4But still wanted coffee

*December 3, 2012*

**math**

can someone tell me how you figure at interest rates and number of periods, on income for 30 days. need help thanks

*December 3, 2012*

**math**

the supervisor i'll give you a penny taday and double your pay every day for 30 days if you work for me. use a table to slove this problem what balance after 30 days? what is the interest rate and number of periods for this? what is a equstion for this also?

*December 3, 2012*

**Algebra2**

Decide whether y is a function of x. 1. 5x - y = 10 2. x^2 + y^2 = 4

*November 29, 2012*

**math**

explain how you would write the number that is 2 tens more than 53?

*September 27, 2012*

**calculus**

Find c for Rolle's Theorem for f(x) = x3 – 12x on [0,2 3 ]

*September 19, 2012*

**Math**

How to make all sums the same in a 9 square box in every direction? Top row has a 89, and a 41

*August 21, 2012*

**English**

Help analyze this poem Amok He weaves his wife's limbs With those of her startled lover's. His sight grows dim as the flowered Sheets darken. His ears pound with heart's Hooves, the hoots and footstomping Of drinking mates who swear They would do the same and worse...

*August 2, 2012*

**math**

if you have 5,368,709.12 can anyone help with what is the interest rate and number of periods for this? thanks

*April 12, 2012*

**Chemistry**

Thanks so much DrBob222. This helped a bunch!

*April 10, 2012*

**Chemistry**

12. In a calorimeter, 10 g of ice absorbs heat with an enthalpy of fusion of 334 J/g. What is the heat absorbed? q = mCHf I am having a lot of trouble on this type of problem in chem. Help and an explanation would be greatly appreciated. Thank you.

*April 10, 2012*

**Chemistry**

17. You have the following equations: 2S (s) + 3O2 (g) 2SO3 (g), H = 792 kJ 2S (s) + 2O2 (g) 2SO2 (g), H = ? 2SO2 (g) + O2 (g) 2SO3 (g), H = 198 kJ What is the missing H?

*April 10, 2012*

**Chemistry**

16. You have a series of four chemical reactions (1--> 2 --> 3 --> 4). How do you calculate the H2 if you know the other H values? H2 = (H1)(H3)/(H4) H2 = H4 (H1 + H3) H2 = H1 + H3 + H4 H2 = H1 + H3 H4

*April 10, 2012*

**math**

1335

*March 29, 2012*

**Chemistry**

Calcium carbonate decomposes on heating producing potassium nitrate and oxygen. Write a balanced equation for this reaction. Heating 100g of pure potasium nitrae what mass of potassium nitrate would be produced?

*March 21, 2012*

**math**

Thanks a lot

*March 8, 2012*

**geometry**

Adelina is creating a piece of art that is in the shape of a parallelogram. its dimensions are 35 inches by 28 inches and one angle is 80 degrees. find the lengths of both diagonals.

*February 21, 2012*

**Math**

Round 33.56 to the nearest tenth?

*February 15, 2012*

**accounting**

Bryan company budgets sales of 1,800,000, fixed costs of 1,000,000 and variable costs of 1,080,000. what is the contribution margin ratio for Bryan Company

*February 15, 2012*

**6th Grade Math**

Round 33.56 to the nearest tenth?

*February 14, 2012*

**English**

We laughed at the colorful ball. Is this sentence structurally ambiguous?

*February 8, 2012*

**math**

This is an inverse function, so it will look a little funky. Don't get confused with the slope and y intercept: We can say our intervals will be [1,5] in millions. Since initial profit will = $150,000 and x = 0, we can use this as the y-intercept. Now, to find the rate at ...

*February 2, 2012*

**algebra**

a building in a city has a rectangular base. the lenght of the base measures 70 ft less than twice the width. the perimeter of this base is 820 ft.

*January 23, 2012*

**AP STATISTICS**

Mens shirt sizes are determined by neck sizes. suppose the mens nexck sizes are approximatley normally distributed with mean 15.7 inches and standard deviation 0.7 inch.retailer sells men shirts in S,M,L,XL where the shirt sizes are defined in the table below. S: 14 ≤ ...

*December 20, 2011*

**math**

you pay 8,000 for a municipal bond. when it matures after 20 years yo u receivee $12,500. what are the total return and the annual return

*November 21, 2011*

**math**

At 9:00 AM, the temperature is 14°C. If the temperature drops 4°C per hour, what will the temperature be at 11:00 AM?

*November 12, 2011*

**math**

Julia is reading a 456-page book. During the past 7 days she has read 168 pages. If she continues reading at the same rate, how many more days will it take her to complete the book?

*October 18, 2011*

**Analytical Skills**

If your score on a statistics exam was 76 and the professor gave you the distribution for the exam score for your class, you could find your percentile to understand where you stand in comparison to your fellow students. Assume that the distribution for exam scores is normally...

*October 6, 2011*

**accounting**

Suppose a company rents a building for $250,000 a year for the purpose of manufacturing between 80,000 and 140,000 units (the relevant range of activity). The rental cost per unit of production will __________ as production levels increase.

*September 30, 2011*

**math**

298 divided by.04

*September 26, 2011*

**maths**

A circle has a circumference of 1 Cm and an equilateral triangle has sides each 1 Cm long. How many complete turns of the circle will it take to go around the triangle to its original starting position.

*September 16, 2011*

**economics**

TB

*September 1, 2011*

**algebra**

Create a unique example of dividing a polynomial by a monomial and provide the simplified form. Explain, in complete sentences, the two ways used to simplify this expression and how you would check your quotient for accuracy. please explain :/ i only remember one way to solve ...

*July 6, 2011*

**physics**

An 80.9 kg astronaut is taking a space walk to work on the engines of his ship, which is drifting through space with a constant velocity. The astronaut, wishing to get a better view of the Universe, pushes against the ship and much later finds himself 30.3 m behind the ship. ...

*May 31, 2011*

**Math**

If you input 0 1 2 3 and the output is 25 43 61 79 what is the rule

*April 29, 2011*

**Math**

Julie owns a video store. Her monthlyexpenses, including rent, average $1,185. This year she made $34,620 in revenue. What is the difference between her average monthly revenue and her average monthly expenses? HELP

*April 29, 2011*

**hum186**

8. Explain the effect of relationships among TV, movies, and electronic games and culture.

*April 10, 2011*

**Chemistry**

16. You have a series of four chemical reactions (1--> 2 --> 3 --> 4). How do you calculate the H2 if you know the other H values? H2 = (H1)(H3)/(H4) H2 = H4 (H1 + H3) H2 = H1 + H3 + H4 H2 = H1 + H3 H4

*March 22, 2011*

**physics**

E=B*l*v*cos(theta) =(40)(0.024)(14.9)cos(0)<---east-west solve, the answer is in micro teslas west end in positive direction

*February 5, 2011*

**Chemistry**

a geometric isomerism

*January 30, 2011*

**penn foster**

sorry, my first time using this site. Medical Transcription lab homework. Radiology report. Woman dictates "in the plantar medial soft tissues extending to this abnormal soft tissue, carotery stick, suggesting an area of ulceration." I'm not sure if I'm ...

*January 26, 2011*

**penn foster**

i'm typing my lab 2, case 8 radiology report and can't make out one word in the report. "carotery stick" it what it sounds like the lady is saying, but it doesn't make sense and I can't find it in any dictionary. help

*January 26, 2011*

**8th grade Science**

im, not sure this question apeears to be quit a hard one

*January 19, 2011*

**Chem 10**

Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter the correct number of significant figures. (2.700e2 cm)3 / (1.20e3 cm)2 Can't understand how many sig figs.

*January 18, 2011*

**physics**

how can the work done to an object be the same amout as the potential energy when sitting on an incline plan.. (the object is a marble)

*January 12, 2011*

**physics**

how can the work done to an object be the same amout as the potential energy when sitting on an incline plan.. (the object is a marble)

*January 12, 2011*

**math**

forty-nine days is how many weeks? what are the factors of 12? forty books were put into eight equal stacks how many books were in each stck? how many years are in five centuries? what is the seventh mutiple of 6 then subtract 12 what is the differcecne?

*December 15, 2010*

**com 156**

What are some red flags that indicate you should avoid a particular source?

*November 29, 2010*

**math**

how often does a leap year occur? what are al the prime numbers less then 12. what is the eighth multiple of 32? is the last digit of the multiples if 4 odd or even? what are the six factors of 12? what are the factors of 16. two factors of 20 are 1 and 20. what are the four ...

*November 9, 2010*

**math**

ms. sue i can't find the goolge calultor

*November 9, 2010*

**math**

1234 + 607= 47,019 + 21,598= 405,679 + 319,477= ____________________ 1234 - 607= 47,019 - 21,598= 405,679 - 319,477=

*November 9, 2010*

**Chemistry**

i need help

*November 7, 2010*

**math**

25. is 16 a prime number? why or why not? 27. which of these numbers is a factor of 12? A 0 B 6 C 8 D 24

*November 4, 2010*

**math**

washington school cost about $12,350,000 to build. use words to write that amount of money. 24. two factors of 16 are 1 and 16 beacuse 1*16= 16. find three more factors of 16.

*November 4, 2010*

**math**

21.a. which of these number is a multiple of 10? A 35 B 40 C 45 D 101 b. how can you fine the answer for part a just by looking? 22.a. A dime is what fraction of a dollar? b. A dime is what percent of a dollar

*November 4, 2010*

**math**

10. $10.00-$5.46 11. 36,024 - 15,539 12. 43,675 + 52,059 19. 3.75 + 2.5 + 04 20. 42.25-7.5

*November 4, 2010*

**math**

8. in the 2004 presidentail election, 4651 residents of the state of rhode island voted for candidate ralph nader. round that number of residents to the nearest thousand, to the nearest hundred, and to the nearest ten.

*November 4, 2010*

**math**

write for multiplication/division facts using the numbers 3, 8, and 24. 5.what are the seven months of the year that have 31 days? 6. find the eughth multiple of six. then add one. what is the square root of the answer?

*November 4, 2010*

**math**

21.a. which of these number is a multiple of 10? A 35 B 40 C 45 D 101 b. how can you fine the answer for part a just by looking? 22.a. A dime is what fraction of a dollar? b. A dime is what percent of a dollar? 23. washington school cost about $12,350,000 to build. use words ...

*November 4, 2010*

**math**

whrit for multiplication/division facts using the numbers 3, 8, and 24. 5.what are the seven months of the year that have 31 days? 6. find the eughth multiple of six. then add one. what is the square root of the answer? 8. in the 2004 presidentail election, 4651 residents of ...

*November 4, 2010*

**math**

thank you

*November 4, 2010*

**math**

1.Drew has fifty-six rolls. seven rolls will fit on one tray. how many trays does he need to carry all of the rolls? write an equation to solve the problem. 2. one gallon is about 3.78 L.about how many liters tow gallons? use words to write the answer. to estimate the sum of $...

*November 4, 2010*

**math**

merle travelled six hundred twenty-three miles. hannah travelled eight hunderes one miles. hannah travelled how many more miles then merle?

*October 27, 2010*

**math**

264

*October 25, 2010*

**math**

liza has three hundred seventen coins in her collection. Tamca has found five hundred eighty-one coins in her collection. Tamca has how many more coins then liza?

*October 25, 2010*

**math**

since you can convert decimals into fractions and if it is a repeating decimal you put it under a 9 so it would 6/9

*October 20, 2010*

**math**

one gallon is equal to 128 fluid ounces.Garret estimates that four gallons is about 500 fluid ounces. is Garrett's estimate reasonable? expiain why or why not.

*October 20, 2010*