Saturday

May 28, 2016
Total # Posts: 2,974

**math**

12
*May 6, 2010*

**chemistry**

A solution is prepared by mixing 0.0433 mol CH2Cl2 and 0.0623 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11...
*May 4, 2010*

**chemistry**

Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 180. g of glycerin to 321 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.
*May 4, 2010*

**chemistry**

Calculate the molarity and mole fraction of a 2.35 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the final volume equals the sum of the volumes of acetone and ethanol.
*May 4, 2010*

**chemistry**

Calculate the sodium ion concentration when 55.0 mL of 4.5 M sodium carbonate is added to 15.0 mL of 3.0 M sodium bicarbonate.
*May 4, 2010*

**earth and space science**

i like pie
*April 29, 2010*

**chemistry**

What must be the pH of a solution that is 0.067 M Fe3+ to just cause Fe(OH)3(s) to precipitate?
*April 28, 2010*

**math**

prove the following: given: ABCD is a trapezoid with bases BC and AD to prove: BX • AX = DX • CX X is the intersection of the segment going from BD and AC i need the answer in a two column proof statements Reasons 1. ABCD is a trapezoid with 1. given bases BC and AD ...
*April 28, 2010*

**physics**

In the figure below, a box of Cheerios (mass mC = 0.8 kg) and a box of Wheaties (mass mW = 2.5 kg) are accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 2.0 N, and the ...
*April 26, 2010*

**ACCOUNTING**

if a company issued $32,000,000 of 10-year, 12% bonds at an effective interest rate of 13%, receiving cash of $30,237,139 and interest on the bonds is paid semiannually how do you calculate the first semiannual interest payment and the amortization of the bond discount?
*April 26, 2010*

**math**

38 animals
*April 22, 2010*

**physics**

It emits a sound, so the equation is Intensity = Power / 4(pi)r^2 r being the distance, 158 meters.
*April 21, 2010*

**AP Chemistry **

I decided to set up an ICE chart but I am a little confused. This is what I did: CaCl2 + K2SO4 = CaSO4 + 2 KCl I 0.020M 0.20M 0 0 C -X -X +X +2X E 0.020-x 0.20-x 0+x 0+2x Am I right in saying this? Additional information: Ksp= (CaSO4)(KCl)^2 / (CaCl2)(K2SO4) Ksp= 2.4 x 10^ -5
*April 21, 2010*

**AP Chemistry **

100. mL of 0.020 M CaCl2(aq) is added to 200. mL of 0.20 M K2SO4(aq). Calculate the equilibrium concentrations of Ca^2+ (aq) and SO4^2-(aq)
*April 21, 2010*

**Finance**

Suppose you are considering two investments, stock A and stock B. The beta of A is 1.20, and the beta of B is 0.80. Stock A has an expected return of 12% and Treasury Bills are yielding 3%. If the two stocks are fairly prices, what's the expected return on the Market Index...
*April 20, 2010*

**College Chemistry**

If you have the molecular weight of ethanol which is 46.1 and the concentration is 4.0% w/v. What is the molarity
*April 20, 2010*

**physics**

Frank stands at the base of a building. He throws a 0.12kg rock straight up at a speed of 28m/s so that it rises to a maximum height of 12m above the top of the building and then falls straight down on the roof of the building. a) What is the height of the building? b) What is...
*April 18, 2010*

**physics**

A helicopter hovering above a forest fire dumps a large bucket of water. How far does the water fall during the third season?
*April 18, 2010*

**physics**

Does a free falling object have a velocity of zero? If it does then is it zero for the initial velocity or the final velocity?
*April 18, 2010*

**Physics Gr.11**

thanks!
*April 18, 2010*

**science**

does the pumping of a soap dispenser have anything to do with boyles law?
*April 18, 2010*

**math/substituion method**

x+3y=-6 3x+9y=6
*April 17, 2010*

**Langusge Arts**

what are the metaphors in here
*April 14, 2010*

**English**

buhgtuyrvwo6qtp28 qte87p2ety q2hye89ggggggggggggggggggggggggggggggggggggs7yu8oydu8yqo9syvqwhyuivy2qgeuyv7iqwugecuyl wgehjygtw tdgyhbwvg dguywbg sduyqw gt7yqwe utys ugsv asuyw vdb syyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyys7duiw68d6vw6ed
*April 14, 2010*

**trig**

8========)--------
*April 13, 2010*

**Chemistry**

Assuming that sea water is a 3.5 wt % solution of NaCl in water, calculate its osmotic pressure at 20°C. The density of a 3.5% NaCl solution at 20°C is 1.023 g/mL.
*April 13, 2010*

**Chemistry**

How much heat is released when 75.0 g of steam at 100.0°C is cooled to ice at -15.0°C? The enthalpy of vaporization of water is 40.67 kJ/mol, the enthalpy of fusion for water is 6.01 kJ/mol, the molar heat capacity of liquid water is 75.4 J/(mol °C), and the molar ...
*April 13, 2010*

**Chemistry**

Calculate the total quantity of heat required to convert 25.0 g of liquid CCl4(l) from 25.0°C to gaseous CCl4 at 76.8°C (the normal boiling point for CCl4)? The specific heat of CCl4(l) is its heat of fusion is and its heat of vaporization is
*April 13, 2010*

**Science**

When 260. mL of 1.50 x 10-4 M hydrochloric acid is added to 125 mL of 1.75 x 10-4 M Mg(OH)2, the resulting solution will be
*April 13, 2010*

**chemistry**

We want to make 100. mL of 1.0 M NaA solution by dissolving solid NaA in water. What mass of solid NaA is needed?
*April 12, 2010*

**9th grade geometry**

take 360 divided by how many slices it was cut into for the arc of each. divide 360 by that number, multiply it by pi, than multiply it by the radius. that'll give you the area of one slice, so all you have to do now is multiply the area of one slice by 3 for all 3 slices...
*April 12, 2010*

**math riddle algebra pizzaz**

living in x aisle
*April 12, 2010*

**geometry**

i have only a measuremment for one side of a triangle need to find the other to to find area how do i do this
*April 12, 2010*

**Calculus**

How did you guys get those formulas I have the same question and I have no idea how to start it
*April 10, 2010*

**phisics**

676
*April 7, 2010*

**chemistry**

Strontium-90 has half-life of 28 years. if a 1.00-mg sample was stored for 112 years. what mass of Sr-90 would remain?
*April 6, 2010*

**MATH**

IS 8 FL OZ ONE CUP
*April 6, 2010*

**2nd grade**

100 millon
*April 5, 2010*

**accounting**

I am attempting to study for an exam for tomorrow and cannot figure out the equity method entries up to 2006 for this problem, can someone please help! Parent Corporation owns 80% of Subsidiary Corporationâ€™s outstanding common stock that was purchased at book...
*April 5, 2010*

**chem lab (webwork)**

the answer is NOT d!!...i just did it and got it wrong -__-
*April 5, 2010*

**elementary math**

when finding the factors for 841 what is the largest factor you would have to test?
*April 2, 2010*

**algebra**

6 over x to the 10th times x to the 17th over 15
*April 1, 2010*

**algebra**

6 over x to the 10th times x to the 17th over 51
*April 1, 2010*

**science**

The ______ of a transverse wave is the distance between 2 crests or 2 troughs.
*March 31, 2010*

**Geography**

32. Bucharest, Romania 33. Budapest, Hungary
*March 30, 2010*

**Statistics**

How do you calculate the value of z* and t* on the TI-84 and TI-89 (the number used in confidence intervals)?
*March 30, 2010*

**Math**

I know that's the first thing that comes to mind, but my teach said that it can be done. He said that the answer is $0.05, so if someone can work backwards somehow and explain to me how he arrived at that answer I would appreciate it. :)
*March 28, 2010*

**Math**

If a bottle and a stopper cost $1.10. How much does the stopper cost?
*March 28, 2010*

**math**

X= 1
*March 28, 2010*

**reiny**

Where did you get .55? I don't need the slope I don't think. This is a pretty straightforward Q, I don't need to graph it.
*March 28, 2010*

**another word problem!**

iN 1993, THE LIFE EXPECTANCY of males was 68.6 years. In 2000, it was 71.1 years. Let E represent the life expectancy in year t and t represent the number of years since 1993. The linear function E(t) that fits this data is: E(t)=_t + _ (round to the nearest tenth) Use the ...
*March 28, 2010*

**please help! Examples in book are different!**

train A and b are traveling in the same direction on parallel tracks. Train A is traveling at 40 mph, and B is at 60 mph. Train A passes the station at 12:25 am, and train b passes the station at 12:40 am, what time will train b catch up to train A?
*March 28, 2010*

**word problem**

train A and b are traveling in the same direction on parallel tracks. Train A is traveling at 40 mph, and B is at 60 mph. Train A passes the station at 12:25 am, and train b passes the station at 12:40 am, what time will train b catch up to train A?
*March 28, 2010*

**math**

I need help! Solve by hte elimination method: 7r-9s=-12 9r+7s=96 When I do this, I get a crazy fraction, and I know the answer is a point. (r,s) But what I'm getting is ridiculous. I got -564/130=s! That has to be totally wrong!
*March 28, 2010*

**math**

how do I solve this? I know it's common math, but I cannot remember how! -4x> 1/11 I think I multiply both sides by 11, but..... I can't remember how!
*March 28, 2010*

**math**

Help! These are fractions, so bear with me: -5/8 x= -9/10 Solve with the multiplicaation principle. How do I do this? The fractions throw me off every time!!!
*March 28, 2010*

**math substitution method**

I know this! Put it in for x. So 7(28-6y) +5y=-26 use that to get y, then plug your answer for y into one of the equations to get x
*March 28, 2010*

**math**

Help! These are fractions, so bear with me: -5/8 x= -9/10 Solve with the multiplicaation principle. How do I do this? The fractions throw me off every time!!!
*March 28, 2010*

**algebra/common math**

how do I solve this? I know it's common math, but I cannot remember how! -4x> 1/11 I think I multiply both sides by 11, but..... I can't remember how!
*March 28, 2010*

**algebra**

I need help! Solve by hte elimination method: 7r-9s=-12 9r+7s=96 When I do this, I get a crazy fraction, and I know the answer is a point. (r,s) But what I'm getting is ridiculous. I got -564/130=s! That has to be totally wrong!
*March 28, 2010*

**3rd grade**

Unscramble cioponam
*March 23, 2010*

**physics**

10.2
*March 23, 2010*

**6th grade - English**

what is the antonym for ndrvr
*March 22, 2010*

**MATH - Can someone please help!**

What is the solution of the interval notion? x less than 6 and x greater than -3
*March 21, 2010*

**algebra**

How do I solve this with the elimination method? 5x-10y=4 5x-10y=5 I need x=, and y= to get an ordered pair, but every time I mult. by a neg, everything goes away instead of just one variable! please help!
*March 21, 2010*

**chemistry**

At 300.K and 1.00 atm, assume that 25 mL of NO gas reacts with 22 mL of oxygen gas and excess water to produce nitric acid according to the following equation: O (g) H O(l) 2 HNO (g) 2 2NO(g) 3 + 2 + 2 ⎯⎯→ 3 . If all of the nitric acid produced by this ...
*March 21, 2010*

**Math**

What is the solution of the interval notion? x less than 6 and x greater than -3
*March 21, 2010*

**algebra**

how do I break this down? 4x-7 <-4 over 6 the 4x-7 is all over 6 (like a fraction) I thought I just multiply by 6 to get rid of the fraction?
*March 20, 2010*

**algebra**

YOU ARE RETART JEWBU
*March 17, 2010*

**6th grade math**

answear is x>54(11)+ 20 what is x,=81
*March 16, 2010*

**chemistry**

What are the probably products of... a) an aqueous solution of two ionic compounds b) a single compound c) two elements d) oxygen and a compound of carbon and hydrogen ?
*March 16, 2010*

**Environmental Science**

very helpful :)
*March 15, 2010*

**math**

How do I solve the equations using the elimination method: .3x-.2y=4 and .4x +.3y= 49/23 Normally I would multiply the decimals by 10 to make them whole numbers, but that fraction is really throwing me off. What do I multiply to eliminate that fraction? Please help!
*March 14, 2010*

**Auditing**

1. Which of the following matters would an auditor most likely consider to be a significant deficiency to be communicated to the audit committee? A. Management's failure to renegotiate unfavorable long-term purchase commitments. B. Recurring operating losses that may ...
*March 11, 2010*

**Math 208**

3....
*March 8, 2010*

**Math 208**

3....
*March 8, 2010*

**Math 208**

;...
*March 8, 2010*

**Math 208**

3.14159265358979323
*March 8, 2010*

**Math 208**

My mom
*March 8, 2010*

**Math 208**

Hee hee
*March 8, 2010*

**Business**

Looks right to me
*March 5, 2010*

**Physics**

A sled is initially given a shove up a frictionless 19.0 ∘ incline. It reaches a maximum vertical height 1.35 m higher than where it started at the bottom.
*March 3, 2010*

**algebra 1**

Itwantedtobethenightmare
*March 2, 2010*

**Calculus**

Where did you get the (L-5) and the (W-4)?
*March 1, 2010*

**math**

When a lady faints, what number do you need to bring her?
*February 28, 2010*

**Chem**

A gas at a pressure of 1 atm, a volume of 1 , and a temperature of 25 C. What would happen to the pressure if the volume were reduced to 0.5 and the temperature increased to 250 C ?
*February 27, 2010*

**chemistry **

Diacetyl, a substance contributing to the characteristic flavor and aroma of butter, consists of 55.8% C, 7.03% H, and 37.17% O. In the gaseous state at 100 degrees celsius and 747 torr, a 0.30 gram sample occupies a volume of 111 ml. What is the molecular formula of diacetyl?
*February 23, 2010*

**Chemistry**

A mixture of gasses at a total pressure of 95 kPa contains N2, CO2, and O2. The partial pressure of the CO2, is 24 kPa and the partial pressure of the N2 is 48 kPa. What is the partial pressure of the O2?
*February 22, 2010*

**Chemistry **

A gas storage tank has a volume of 350,000 when the temperature is 27 degrees celcius and the pressure is 101 kPa. what is the new volume of the tank if the temperature drops -10 degrees celcius and the pressure drops to 95 kPa? please show work.
*February 22, 2010*

**Physics**

u r wight and ask ur teacher if u are confused it is the best way...
*February 22, 2010*

**Science**

You are 100% correct...I think...
*February 22, 2010*

**Chemistry**

A gas occupies a volume of 140 mL at 35 degrees celsius and 97 kPa. What is the volume of the gas at STP?
*February 22, 2010*

**Chemistry **

A 10 gram of mass of krypton occupies 15.0 L at a pressure of 210 kPa. What is the volume of the krypton when the pressure is increased to 790 kPa?
*February 22, 2010*

**College physIcs**

"You don't seem to be willing to take step one in answering these problems yourself. " What good is just knowing a formula?
*February 19, 2010*

**ethics 125**

· Consider the following statements: (a) Asian Americans and Pacific Islanders are a model minority, and (b) Asian Americans and Pacific Islanders belong to a single “Asian American” culture. If someone said one of these statements to you, how would you ...
*February 18, 2010*

**4th grade math**

I think Erik meant to say that Judy had 15, not 12. Then, it solves that 27+ (27-12)=42, right? My SIL just called asking us this same question...must be at the same place in the book!
*February 17, 2010*