Friday

November 21, 2014

November 21, 2014

Total # Posts: 133

**College Chemistry **

how many liters of ethanol contain 1.5 kg of ethonal?
*September 14, 2014*

**college physics**

A block of mass 21.5 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 3.79 m/s2. what is the tension in the cable? what is the magnitude of the net force acting on the mass? what is the speed of the...
*July 1, 2014*

**college physics**

A block of mass 21.5 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 3.79 m/s2. what is the tension in the cable? what is the magnitude of the net force acting on the mass? what is the speed of the...
*June 30, 2014*

**james madison high school algebra**

Can anyone help me with Ashworth high algebra 1 part 2 I really need some help I'm not good with math
*May 23, 2014*

**dynamics of catering **

It's sometimes permissible to eat _____ with your fingers. A.fried clams B.soft boiled eggs C.hot dogs D.asparagus
*March 17, 2014*

**Math**

Do you need to regroup to find 73-35 ?
*October 29, 2013*

**math**

the sample of selected men have the average weight of 180 lb with the standard deviation of 30 lb. For a 0.95 degree of confidence find confidence interval for the mean of the whole population, assuming the normal weight distribution and the following conditions: 40 men selected
*August 13, 2013*

**children who require special treatment**

I.Q
*August 6, 2013*

**math**

How many feet will it take a car traveling at 120 mph to stop?
*March 23, 2013*

**science**

property of muscle in which the strength of its contraction can vary from weak to strong
*January 31, 2013*

**science**

I am doing the crossword puzzle and I need name nerve fiber control over muscle or gland effector activity
*January 31, 2013*

**science**

nerve fiber control over muscle or gland effector activity
*January 31, 2013*

**biology**

property of muscle in which the strength of its contraction can vary from weak to strong
*January 31, 2013*

**biology**

nerve fiber control over muscle or gland effector activity
*January 31, 2013*

**chem**

What is the pH of a 0.22 M solution of HClO4?
*December 6, 2012*

**math**

In January 2010, the Burj Khalifa Tower officially became the tallest building in the world. This tower has a curtain wall (the exterior skin of the building) that is approximately 133,500 square yards. Convert this to square feet.
*December 5, 2012*

**math**

In January 2010, the Burj Khalifa Tower officially became the tallest building in the world. This tower has a curtain wall (the exterior skin of the building) that is approximately 133,500 square yards. Convert this to square feet.
*December 5, 2012*

**math**

Currently, the Toyota Corolla is the best selling car in the world. Suppose that during a test drive of two Corollas, one car travels 224 miles in the same time that the second car travels 175 miles. If the speed of the first car is 14 miles per hour faster than the speed of ...
*December 5, 2012*

**math**

Currently, the Toyota Corolla is the best selling car in the world. Suppose that during a test drive of two Corollas, one car travels 224 miles in the same time that the second car travels 175 miles. If the speed of the first car is 14 miles per hour faster than the speed of ...
*December 4, 2012*

**math**

A pilot can fly an MD-11 2160 miles with the wind in the same time she can fly 1920 miles against the wind. If the speed of the wind is 30 mph, find the speed of the plane in still air.( Source: Air Transport Association of America)
*December 4, 2012*

**math**

Currently, the Toyota Corolla is the best selling car in the world. Suppose that during a test drive of two Corollas, one car travels 224 miles in the same time that the second car travels 175 miles. If the speed of the firstvcar is 14 miles per hour faster than the speed of ...
*December 4, 2012*

**math**

Thank you!
*December 4, 2012*

**math**

what is the dross product of c/28=49/16
*November 30, 2012*

**math**

2*6=4, 4*1=7 8*3=1 find value of 5*5
*August 20, 2012*

**Statisics**

The state lottery claims that its grand prize is $1 million. The lucky winner will receive $50,000 upon presentation of the winning ticket plus $50,000 at the end of each year for the next 19 years. Why isn't this really a million-dollar prize? What would it actually be ...
*July 19, 2012*

**Statisics**

The state lottery claims that its grand prize is $1 million. The lucky winner will receive $50,000 upon presentation of the winning ticket plus $50,000 at the end of each year for the next 19 years. Why isn't this really a million-dollar prize? What would it actually be ...
*July 18, 2012*

**Statistics**

The state lottery claims that its grand prize is $1 million. The lucky winner will receive $50,000 upon presentation of the winning ticket plus $50,000 at the end of each year for the next 19 years. Why isn't this really a million-dollar prize? What would it actually be ...
*July 15, 2012*

**Enviromental Anthro.**

1. How do Fairhead and Leach explain the forest-savanna mosaic in West Africa? a) villagers planted trees and told stories about them b) corporations began logging and mining in the region c) the state prohibited slash and burn farming and created a national park d) Western ...
*May 7, 2012*

**Enviromental Anthro.**

What effects do herding in East Africa and ranching in North America have on those two environments?
*May 7, 2012*

**trig**

cos x/1+sin x + 1+sin x/ cos x= 2sec x
*March 12, 2012*

**bilology**

peroxidase cannot be used to break down chemicals such as starch. why?
*January 30, 2012*

**chemistry**

how many grams of potassium chlorate must be used to produce 30.0g of oxygen?
*January 28, 2012*

**chemistry**

how many grams of potassium chlorate must be used to produce 30.0g of oxygen?
*January 28, 2012*

**calculus**

give an example of a function that has: a) only one point of discontinuity b) exactly two ponts of discontinuity c) an infinite number of discontinuity give an example of a function that is: a) continuous at every point b) discontinous at every point i am confused on how to ...
*September 25, 2011*

**health**

You have been hired as an administrator in an ambulatory care setting. What factors would you expect to encounter and how would you deal with them?
*September 3, 2011*

**trig**

A tower is supported by a guy wire from the top of the tower to the ground 16 ft from its base. The wire makes an angle of 62 with the ground. The length of the wire is a. 30.09 ft b. 18.12 ft c. 28.41 ft d. 34.08 ft
*August 12, 2011*

**statistics**

For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The general population of ...
*June 19, 2011*

**math**

What is the greatest and least possible product you can make using the digits 1,3,5,6 and 7 in the multiplication problem below? Use each digit only once,
*February 24, 2011*

**social studies**

discribe the ancient Egypt civilasation
*January 17, 2011*

**physical science**

change 85 kilograms to grams change 45 meters to centimeters change 70 nanometers to meters
*November 20, 2010*

**Physical science**

Acceleration is F/S A=F/M this is: direct inverse not sure both direct &inverse
*November 20, 2010*

**Physical science**

determine the velocity of a toy jeep if it has a distance of 80 meters and a time of 8 seconds?
*November 20, 2010*

**Physical Science**

force of a toy jeep if the mass=50kg & is traveling at 4m/s& the radius is 50 centimeters.
*November 20, 2010*

**6th Grade English**

Hello, I am looking at the subject of no-count nouns. Which says that it does not have a singular or a plural form. The school book gives Paper for an example. But since you can say "papers" which is plural. How can paper be a non-count noun?
*October 3, 2010*

**physics**

A stone thrown off a bridge 20 m above a river has an initial velocity of 12 m/s at an angle of 450 above the horizontal. a. What is the range of the stone? b. At what velocity does the stone strike the water? (magnitude and direction)
*September 26, 2010*

**6th Grade Math**

How can you find an unknown factor in a multiplication problem? Is the answer: divide the two numbers that you have?
*September 2, 2010*

**math 116**

I am taking this course over again for the second time and it is easy for students that have been out of school for a while
*May 22, 2010*

**math**

Justin had 44 dollars before spending n dollars on jeans. How much money remains
*May 16, 2010*

**algebra**

help me understand how to solve this problem x+4y=17
*May 12, 2010*

**Biology**

A mutation has occurred in one chromosome of a spermatogonium. This mutation will show up in how many of the gametes produced from this cell? Choices: A. None B. Two C. All Four D. Cannot be determined I believe it is 2....If the mutation occurs in the spermatogonium it is ...
*May 9, 2010*

**Chemistry**

Could someone walk me through this problem? 6CO2 + 6H2O --> C6H12O6 + 6O2 partial pressure of CO2 is .26Torr, temp is 25 celsius, calculate volume of air to prouduce 10g glucose I keep getting confused with stoichiometry....my thinking: convert 10 g glucose to moles (which ...
*April 24, 2010*

**Chemistry**

Having some confusion with this question....I have the answers, just not able to reach them. A flask of volume 5L is evacuated and 43.8 g of solid N2O4 is introduced at 77K. The sample is then warmed to 298K during which the N2O4 vaporizes and some dissociates to form brown ...
*April 24, 2010*

**4th grade math**

this is copied correctly. the teacher wanted to keep it simple
*April 19, 2010*

**4th grade math**

if a rug's perimeter is 17cm and the area is 13cm, what are the reasurments for the length and width?
*April 19, 2010*

**Chemistry**

X(g) + 2 Y(g) + 2 Z(g) -->3 M(g) + 2 N(g) I've already found the orders for the following to be: X is 2nd, Y is 1st, Z is 0 and overall of course is 3. But I am confused about the below question. I initially guess that No it doens't occur in one step..but the ...
*April 1, 2010*

**Chemistry**

The hydrolysis of sucrose (C12H22O11) produces fructose and glucose (each C6H12O6). Two mechanisms are proposed: I) Step 1: C12H22O11 --> C6H12O6 + C6H10O5 (slow) Step 2: C6H10O5 + H2O--> C6H12O6 (fast) II) C12H22O11 + H2O--> C6H12O6 + C6H12O6 Would these mechanisms ...
*April 1, 2010*

**chemistry**

ooh nevermind i made a silly error...i have the answer now :)
*March 31, 2010*

**chemistry**

For the first-order reaction A => 3 B + C, when [ A]0 = 0.014 mol·L-1, the concentration of B increases to 0.017 mol·L-1 in 2.7 min. (a) What is the rate constant for the reaction expressed as the rate of loss of A? I found this to be .1923, which I know is ...
*March 31, 2010*

**Chemistry**

2A-->B+C given that the initial concentration of A is .022M and that at 69 s, the concentration of B increases to .0095M, what is the rate constant? i know I need to find the new concentration of A at 69s, but I am having trouble with findthing this. I thought it might be ...
*March 31, 2010*

**Chemistry**

use t= (1/ [ A]) - (1/ [A ]o) over k
*March 31, 2010*

**Chemistry**

i tried multiplying 7/8 and 8/9 by .69 each to find the respective initial concentrations of A to then use for the half life equation t=1/ k*[ A ]
*March 31, 2010*

**Chemistry**

The half-life for the second-order reaction of a substance A is 55.8 s when concentration of initial A = 0.69 M. Calculate the time needed for the concentration of A to decrease to the following values. (a) 1/8 of its original value (b) 1/9 of its original value
*March 31, 2010*

**Chemistry**

Oops, forgot to post the question. 2A-->B+C given that the initial concentration of A is .022M and that at 69 s, the concentration of B increases to .0095M, what is the rate constant?
*March 31, 2010*

**Chemistry**

I need to find the rate constant. I know that it takes 2A to make B, but I am mixed up on how to figure out how to find hte concentration of A at 69s
*March 31, 2010*

**Chemistry**

When 442 mg of NO2 is confined to a 150. mL reaction vessel and heated to 300°C, it decomposes by a second-order process. In the rate law for the decomposition of NO2, k = 0.54 1/(M·s). A) what is the initial reaction rate? B) what is the reaction rate if the mass ...
*March 31, 2010*

**Chemistry**

How much time is required to electroplate 6.530 µg of chromium from a potassium dichromate solution, by using a current of 118 mA? I thought the ratio of e- to moles chromium would be 6/2 but I guess that is wrong? I am using t= nF/A I already made the proper conversions...
*March 29, 2010*

**Chemistry**

Determine the unknown quantity in the following cell at 298.15 K. Pt(s) | H2(g, 1.0 bar)| H+(pH = ?) || Cl -(aq, 1.0 mol·L-1) |AgCl(s), Ag(s), ΔE = +0.36 V. (DrBob) I still wasn't able to figure out the other one--I posted again after that one, but I know there...
*March 29, 2010*

**Chemistry**

Pt(s) | H2(g, 2.0 bar) | H+ (pH = 3.0) || Cl -(aq, 0.85 mol·L-1)) | Hg2Cl2(s) | Hg(l) I need to calculate the voltage for the cell. I have used 1E-3 M for my concentration of H+ given the pH=3 . I don't know how to incorporate the 2.0 bar into the nernst equation. I...
*March 29, 2010*

**Chemistry**

where does the .0592/2 come from? I've been calculating my RT/nF to be .025693/2 ....this is all so confusing...
*March 29, 2010*

**Chemistry**

Yes that's what I used to to try to find the voltage. But my answer is still coming out to be -.1833 which is incorrect
*March 29, 2010*

**Chemistry**

Pt(s) | H2(g, 2.0 bar) | H+ (pH = 3.0) || Cl -(aq, 0.85 mol·L-1)) | Hg2Cl2(s) | Hg(l) I need to calculate the voltage of the cell. I have a pretty good idea of how to use the Nernst equation for this, but am unsure if I am calculating the concentration of H+ correctly. ...
*March 29, 2010*

**Chemistry**

Nevermind, I made a silly mistake in my calculations...I figured it out :)
*March 29, 2010*

**Chemistry**

Pt | Fe2+ (6.4010-5 M), Fe3+ (0.0460 M) || Sn4+ (2.7010-4 M),Sn2+ (0.0750 M) | Pt i need to calculate the voltage of the cell. I know to use E=emf- (RT/nF)lnQ .... I think my problem is with setting up Q. I'm confused on what goes on top and what goes on bottom for the ...
*March 29, 2010*

**Chemistry**

Given the elementary reaction: 2 NOBr==>2 NO + Br2 k = 0.80 Which variables obtained for this reaction will produce a straight line? log[NOBr] vs. t [NOBr] vs. t [NOBr]2 vs. t 1/[NOBr] vs. t instinctively i would choose B, but I am not sure what my prof is getting at with ...
*March 28, 2010*

**Chemistry**

Gallium65, a radioactive isotope of gallium, decays by first order-kinetics. The half-life of this isotope is 15.2 min. How long would it take for 7/8 of a sample of this isotope to decay? 15.2 min 30.4 min 45.6 min 48.0 min I'm not sure how to do this. I initially tried ...
*March 28, 2010*

**Problem Posting**

I literally spent about 15 minutes retyping and rewording things....oh well
*March 28, 2010*

**Problem Posting**

trying to post a question, but it says I'm not allowed to post internet addresses--but I'm not. any ideas on this?
*March 28, 2010*

**Chemistry --Need Help!!**

Thanks :)
*March 24, 2010*

**Chemistry --Need Help!!**

Ive posted twice, but no one's answered yet...I could really use any kind of guidance--particularly for the 1st question :) 1)) The following two half-cells are paired up in a voltaic cell. How will lowering the pH affect the ƒ´E of the overall cell? ClO3-(aq...
*March 24, 2010*

**chemistry**

1)) The following two half-cells are paired up in a voltaic cell. How will lowering the pH affect the E of the overall cell? ClO3-(aq) + H2O(l) + 2e- ==> ClO2-(aq) + 2OH-(aq) Eo= 0.35 V I2(S) + 2e-==> 2I-(aq) Eo = 0.54 V A)dE will increase B)dE will decrease C)...
*March 23, 2010*

**Chemistry**

1)) The following two half-cells are paired up in a voltaic cell. How will lowering the pH affect the E of the overall cell? ClO3-(aq) + H2O(l) + 2e- ==> ClO2-(aq) + 2OH-(aq) Eo= 0.35 V I2(S) + 2e-==> 2I-(aq) Eo = 0.54 V A)dE will increase B)dE will decrease C)dE...
*March 23, 2010*

**Chemistry**

H1+(aq) + Fe(s) ==> H2(g) + Fe2+(aq) I am trying to balance this equation...but I am not sure how to balance the H's. I have the half rxns as e- + H+(aq) ==> H2(g) Fe(s) ==> Fe2+(aq) + 2e- I multiplied the reduc. rxn (top) by 2 so I could get rid of the electrons...
*March 22, 2010*

**Chemistry**

For the following electrochemical cell, what is the correct, balanced reaction? Cu(s) | Cu2+(aq) || Ag+(aq) | Ag(s) A. Cu(s) + Cu2+(aq) → Ag+(aq) + Ag(s) B. Cu(s) + Ag+(aq) → Cu2+(aq) + Ag(s) C. Cu(s) + 2 Ag+(aq) → Cu2+(aq) + 2 Ag(s) D. Cu2+(aq) + Ag(s) &#...
*March 21, 2010*

**Chemistry**

Use the data in this table to calculate the solubility of each sparingly soluble substance in its respective solution. (a) silver bromide in 0.066 M NaBr(aq) mol · L-1 I know how to do this one, found it to be 1.167E-11 which is correct. (b) nickel(II) hydroxide in 0....
*March 19, 2010*

**Chemistry**

Use the data in this table to calculate the solubility of each sparingly soluble substance in its respective solution. (a) silver bromide in 0.066 M NaBr(aq) mol · L-1 I know how to do this one, found it to be 1.167E-11 which is correct. (b) nickel(II) hydroxide in 0....
*March 19, 2010*

**Chemistry**

Suppose that two hydroxides, MOH and M'(OH)2, both have Ksp = 1.0 10-12 and that initially both cations are present in a solution at concentrations of 0.0036 mol · L-1. Which hydroxide precipitates first? I know MOH ppt's first...but am not sure how to approach ...
*March 19, 2010*

**Chemistry**

I am confused about where I am going wrong here... Suppose that 1.331 g of impure barium hydroxide is dissolved in enough water to produce 250. mL of solution and that 35.0 mL of this solution is titrated to the stoichiometric point with 17.6 mL of 0.0935 M HCl(aq). What ...
*March 13, 2010*

**Chemistry**

HA + OH- ---> H2O + A- .05 .03 0 0 "P"ut in -.03 -.03 +.03 +.03 "U"se up .02 0 .03 .03 "G"et Out It didn't line up well the first time. It makes sense to me...just a little tedious. If you have never seen this, what way have you taught ...
*March 12, 2010*

**Chemistry**

that simple and I've been working on this stuff for 5 hours! Thanks DrBob...I really wish my professor was able to break things down so clearly. Nice lady but she has a way of making me more and more confused... as for a PUG chart..maybe that's her own thing? It's ...
*March 12, 2010*

**Chemistry**

oops so nevermind I realized i made a mistake when calculating the molar mass. I found it to be 46 g/mol but I am still unsure how to find hte pKA value. Thanks!
*March 12, 2010*

**Chemistry**

Suppose that 0.483 g of an unknown monoprotic weak acid, HA, is dissolved in water. Titration of the solution with 0.250 M NaOH(aq) required 42.0 mL to reach the stoichiometric point. After the addition of 21.0 mL, the pH of the solution was found to be 3.75. (a) What is the ...
*March 12, 2010*

**Chemistry**

I have another similar problem. I have calculated everything given (Correctly), but I can't seem to get the right pH for the stoichiometric point (I keep getting 7.16) Question: Suppose that 50.0 mL of 0.25 M CH3NH2(aq) is titrated with 0.35 M HCl(aq). Refer to table 1 and...
*March 12, 2010*

**Chemistry**

Nevermind I researched it for a few hours and finallly figured it out :)
*March 12, 2010*

**Chemistry**

Suppose that 30.0 mL of 0.20 M C6H5COOH(aq) is titrated with 0.30 M KOH(aq). Refer to table 1 and table 2. (a) What is the initial pH of the 0.20 M C6H5COOH(aq)? Using ICE i found to be 2.46 The rest I do not know how to set up or solve... (b) What is the pH after the addition...
*March 12, 2010*

**algebra**

y=.09(sq)-x+11.5 need to find y if x=10
*March 11, 2010*

**Chemistry --Help 2! :)**

Predict whether Fe(OH)2 will dissolve, precipitate, or do neither after: (a) water is added --> dissolve (b) Fe(OH)2 is added--> neither (c) Solid Fe(NO3)2 is added--> precipitate (d) Solid KNO3 is added---> neither I'm given hte answers...but no explanation. ...
*March 9, 2010*

**Chemistry--help!**

Given the equilibrium: HCN(aq) + H2O(l) ←→ H3O+(aq) + CN-(aq) ΔH >0; Ka = 4.0 x10-10 What happens to the concentration of hydrogen cyanide [HCN] when the following stresses are placed on the system at equilibrium? NaCl is added ---> Stays the Same but ...
*March 9, 2010*

**Chemistry**

Consider the gas-phase equilibrium A ⇌ B. In a series of experiments, different initial amounts of A and B are mixed together, and the mixture in each case is allowed to come to equilibrium. Which one of these experiments would yield values for the amounts of A and B ...
*March 8, 2010*

**Chemistry**

Consider the gas-phase equilibrium A ⇌ B. In a series of experiments, different initial amounts of A and B are mixed together, and the mixture in each case is allowed to come to equilibrium. Which one of these experiments would yield values for the amounts of A and B ...
*March 8, 2010*

**Chemistry**

Could someone explain the reasoning for this? 6) Which of the following is a false statement about ALL reactions in equilibrium? a) Increasing temperature shifts the reaction toward the products in an endothermic reaction b) Temperature effects on the equilibrium do not depend...
*March 8, 2010*