Saturday

May 30, 2015

May 30, 2015

Total # Posts: 278

**Ap chem**

How would the addition of hydrogen gas at constant temperature and volume effect rate=k[h2][I2]?
*April 23, 2015*

**Chem**

What is the order of rate = k[NO]2[Br2]. 2nd order?
*April 23, 2015*

**Chem**

Can someone help with this one? Half life of 55Cr is about 2 hours. A sample of the isotopes delivered from the reactor to lab requires 12 hours. What is the minimum amount of material that should be shipped to get 1.0 mg of 55Cr. I said 32mg but I got it wrong and I don't...
*April 23, 2015*

**Chem**

What would the unit be if you calculate the rate when A= 0.30 M and b= 0.30 M. I have the calculation done right and its 1.57 x 10 to the -3 but I don't know the unit
*April 23, 2015*

**Chemistry **

Does a k constant have a unit?
*April 23, 2015*

**Chemistry **

At 20 degrees celcius the vapor pressure of toluene is 22 mmhg and that of benzene is 75 mmhg. Assume an ideal solution, equimolar in benzene and toluene. At 20 degrees celcius what is the mole fraction of benzene in the vapor in equilibrium with this solution? If you use pv=...
*April 7, 2015*

**Chemistry **

24.0 mL of a 2.4 M silver nitrate is mixed with 32.0 mL of 2.0 M sodium. Calculate the mass of precipitae formed. Calculate the concentration of all ions remaining in solution after the precipitate forms. I don't know how to start this or where to go with it...
*April 7, 2015*

**chemistry**

16.5 mL of 2.5 M sodium sulfate is mixed with 35.5 mL of 4.5 M sodium nitrate. What is the concentration of all ions in the new solution?
*April 7, 2015*

**Physics - Electric Field**

Pressed enter too soon. My work continued: r=.30 m Forceelectric = 8.99e9 * ((40e-9*60e-9)/(.3*.3) = 2.397
*March 23, 2015*

**Physics - Electric Field **

Find the electric field at a point midway between 2 charges of +40.0e-9 C and +60.0E-9 C separated by a distance of 30.0 cm. My work: q1=40E-9 q2=60e-9
*March 23, 2015*

**Chemistry**

Here's the work: a) .575 g Li3N(1 mol Li3N/34.83 g Li3N)(6 mol Li/2 mol Li3N)(6.941 g L/1 mol Li) = 0.334 g Li Plug in the molar ratios and masses of N2 for part B.
*March 8, 2015*

**Math 222**

I am having difficulties trying to do rational expressions. I have to use the words Domain, Excluded Value, Set, Factor, and Real Numbers to show how I got the answer. Can someone please help me solve this one? g^2-6g-55 ___________ g
*February 19, 2015*

**Physics**

A baseball player slides into third base with an initial speed of 3.8m/s. If the coefficient of kinetic friction between the player and the ground is 0.40, how far does the player slide before coming to rest?
*February 11, 2015*

**chemistry**

An equilibrium is dynamic. true or false
*December 17, 2014*

**Mechanics, Rigid body**

At t = 0 s a flywheel is rotating at 20 rpm. A motor gives it a constant acceleration of 1 rad/s^2 until it reaches 100 rpm. The motor is then disconnected. How many revolutions are completed at t = 21 s? What I've done so far is multiply my 20rpm and 100rpm by (2pi/60) to...
*December 14, 2014*

**physics**

Two canoeists start paddling at the same time and head toward a small island in a lake. Canoeist 1 paddles with a speed of 1.40m/s at an angle of 45 degrees north of east. Canoeist 2 starts on the opposite shore of the lake, a distance of 1.5 km due east of canoeist 1. A) In ...
*September 24, 2014*

**geometry**

One endpoint and the midpoint of a segment are given. Find the coordinates of the other endpoint. Show all your work. A. Endpoint: (-1,9) Midpoint: (-9,-10) Endpoint: _______ B. Endpoint: (9,-10) Midpoint: (4,8) Endpoint: ________
*September 11, 2014*

**Math**

What number is 1,000,000 greater than 337,676
*August 26, 2014*

**History**

What did the founding fathers of the United States create in order to ensure that one person did not ever have too much power in the government?
*May 29, 2014*

**science**

if you wanted to consult the geologic time scale for when the first vertebrates evolved, where would you look?
*April 17, 2014*

**Accounting**

During the week ended May 15, 2013, Scott Fairchild worked 40 hours. His regular hourly rate is $31. Assume that his earnings are subject to social security tax at a rate of 6.20 percent and Medicare tax at a rate of 1.45 percent. He also has deductions of $48 for federal ...
*April 15, 2014*

**Help Here**

Help me please.
*April 10, 2014*

**Social Studies**

On the world or in general. I'm trying to argue the mayan civilization was the best and i need to know what negative effects did the Incas and Aztecs do.
*April 10, 2014*

**Social Studies **

What were the negative impact or effects of the Incas and Aztecs? Thank You
*April 10, 2014*

**Social Studies **

Has the effort of Westerners to aid the rest of the world done more good than harm? Its a opinon but i would like a answer please. Please make your answer at least 6 sentences. Thank you very much
*April 8, 2014*

**math**

the odds are against 2/7. Meaning 2 out of 7 chances you are going to have s. And 5 out of 7 you will not get S.
*April 8, 2014*

**ap biology**

What barriers might hinder the acquisition of plasmids?
*April 8, 2014*

**algebra**

. Mrs. Crenshaw has confiscated 4 cell phones from 4 different students because they used them during class. To get the cell phones back, they have to answer the fol- lowing question: What is the probability that no student receives his or her own phone if Mrs. Crenshaw hands ...
*March 10, 2014*

**Statistics**

I have 8 marbles: 3 blue, 1 green, 4v reds. What is the probability of selecting a blue marble twice with replacement and twice without replacement
*March 8, 2014*

**algebra**

There is an 18 inch sandwhich that Jenny cuts and gives half of the sandwhich to Demi and Joel gets 3/4 of what jenny has. Add all up to 18
*March 5, 2014*

**Math**

Thank you PsyDAG this will be very helpful.
*March 5, 2014*

**Math**

When Christy made tortillas for the first time, she used all the dough to make 10 tortillas. After making quesadillas, she decided that the tortillas were not large enough. The next time, using the same amount of dough, she made each tortilla the same thickness but 25% larger...
*March 5, 2014*

**STATISTICS**

a student took all 8 test in a semester and had an average of 84. then the teacher dropped the lowest test score which was a 63. what was the new test average after that?
*February 10, 2014*

**Physics**

A man at point A directs his rowboat due north toward point B, straight across a river of width 100 m. The river current is due east. The man starts across, rowing steadily at 2.50 m/s and reaches the other side of the river at point C, 150 m downstream from his starting point...
*February 2, 2014*

**Social Studies**

What events in hitler's childhood lead him to become a dictator? Please help and thank you so much.
*January 29, 2014*

**English**

How would you paraphrase this excerpt from "A Tale-Tell Heart" by Edgar Allen Poe; "I bade them search - search well. I led, at length, to his chamber. I showed them his treasures, secure, undisturbed"
*January 12, 2014*

**Algebra**

Thank you very much!!!
*December 4, 2013*

**Algebra**

If f(x)=2x+1 and g(x)=3x-5, find f(g(2)).
*December 4, 2013*

**math**

Thank you!
*November 20, 2013*

**math**

A support wire runs from the top of a tower to the ground. If the tower is 1200 feet tall and the wire is attached to the ground 500 feet away from the tower, how long is the support wire?
*November 20, 2013*

**Chemistry**

Your space ship has docked at a space station above Mars. The temperature inside the space station is 24oC at a pressure of 745mmHg. A balloon with a volume of 425mL drifts into the airlock where the temperature is -95oC and the pressure is 0.115 atm. What is the new volume of...
*November 14, 2013*

**finance**

company starting salary 75,000 retirement benefits 401k with annual contribution of 5% company will match 3% (for max contribution of 8% salary) avg 401k return within mutual fund options at 8% per year sign on bonus 0 annual bonus after 2 years of service annual bonus of $...
*November 11, 2013*

**MATH**

5000000 times x divied by y ?
*November 10, 2013*

**MATH**

what is : 4)x+y)-10
*November 10, 2013*

**math**

what is 71 times 45 equal
*November 10, 2013*

**algebra**

Thank you Ms.Sue!!!!
*November 7, 2013*

**algebra**

Find 2 consecutive integers, the smaller a perfect cube and larger a perfect square.
*November 7, 2013*

**Calculus**

I'm struggling some with the us of trigonomic properties. The problem is integral sin(2x)sec(x) dx and I dont understand how sin(2x)sec(x) simplifies into 2sin(x).
*November 4, 2013*

**psychics**

The lower frequency limit for human hearing is usually considered to be 20.0 Hz. (a) What is the speed of sound in m/s if the air temperature is 20.0ºC? (b) What is the corresponding wavelength for this frequency?
*October 8, 2013*

**Physics**

The lower frequency limit for human hearing is usually considered to be 20.0 Hz. (a) What is the speed of sound in m/s if the air temperature is 20.0ºC? (b) What is the corresponding wavelength for this frequency?
*October 8, 2013*

**Guidance and discipline**

At what age is it typical for a child to begin testing the word no
*September 11, 2013*

**math**

12*120=1440
*August 22, 2013*

**math**

what number could represent the height of a bird 120 feet the surface of the ocean
*August 22, 2013*

**Science**

what is the central theme of the first green revolution?
*August 21, 2013*

**math**

it is claimed that the average age of employees in a large company is 50. a sample of 36 employees is taken and the average age was 49. the standard deviation of the population was 5. use a level of significance of 0.5. what do you think of the claim?
*July 30, 2013*

**science**

you need to prepare 30g of calcium cholride. you have 2m hydrochloric acid and a new container off pure calcium carbonate. Calculate the number of mole of calcium chloride that u need to prepare
*June 29, 2013*

**math**

jimmy is playing a dart game at an arcade. he can earn 2,3,or 6 points with each dart. she scored 24 points. how many ways could he score 24 points given that each dart thrown landed on the dart board?
*May 22, 2013*

**math**

thanks Reiny
*May 13, 2013*

**math**

Rohnda is in charge of buying food for the school picnic, she found that hot dogs are in packages of 24, buns in packages of 18, ketchup in boxes of 12, and mustard in boxes of 15. what is the least number of students that can be feed if each student receives 1 of each item ...
*May 13, 2013*

**math**

thank you a bunch reiny
*May 13, 2013*

**math**

The greatest common factor of 2 numbers is 14, the least common multiple is 168. If the 2 numbers are not 14 and 168, what is the sum?
*May 13, 2013*

**math**

a pentagon is a polygon with 5 sides
*May 13, 2013*

**Math**

i need an example problem using log10E=11.4+1.5m when E means radiated energy and m is means magnitude. the log has a base of 10 thats why the 10 is there. plese help!!! Again, need an example problem relating it to earthquakes
*April 28, 2013*

**Math**

A bicycle trail is 7miles and 880 yards long.How many total yards is the bicycle trail
*April 9, 2013*

**CHEMISTRY HELP PLEASE!!**

@DrBob222 so, for the first part I do, Ksp = (Mg^2+)(OH^-)^2 , which is 1.8x 10^-11 = (.0286)(OH)^2 for OH-, i get 2.51 x 10^-5 then, for the second part, I do, Kb = (NH4^+)(OH^-)/(NH3), which is 1.8x 10^-11 = (NH4)(2.51 x10^-5)/(.114) for NH4, i got 8.17x10^-8 mol then I ...
*March 2, 2013*

**CHEMISTRY HELP PLEASE!!**

0.350L of 0.160 M NH3 is added 0.140 L of 0.100 M MgCl2 . How many grams of (NH4)2SO4 should be present to prevent precipitation of Mg(OH)2 (aq) ? The Ksp of Mg(OH)2 is 1.8 x 10–11.
*March 2, 2013*

**math**

$84.00
*February 18, 2013*

**4th grade math**

...
*January 30, 2013*

**physics**

At the moment car A is starting from rest and accelerating at 5.0 m/s2, car B passes it moving at a constant speed of 45m/s. How long will it take car A to catch up with car B?
*January 17, 2013*

**Chemistry**

1.49 M
*December 7, 2012*

**math**

There are 5 yellow cards, 4 red cards, and 1 purple card. He draws a card at random, replaces it, and draws a second card. What is the probability that both cards will be red?
*November 25, 2012*

**SS8R - paragraph help!**

I think it good.
*November 5, 2012*

**math**

I am not sure but I think it is 50,400 dollars a week. 60 minutes in one hour 24 hours in one day 7 days in week (5x60)=300 300x24= 7200 7200x7=50,400
*November 5, 2012*

**Maths**

x+2x+3x=180 add them. 6x=180 divide 180/6= 30
*November 2, 2012*

**spanish**

dark haired/skinned
*October 29, 2012*

**Health**

Gonorrhea is spread through contact with the ________. A. Anus, !@#$%^&, Mouth, Skin B. !@#$%^&, Anus, Mouth, !@#$%^& C. !@#$%^&, Skin, !@#$%^&, Anus D. Mouth, !@#$%^&, !@#$%^&, Fingers I think it's B?
*October 27, 2012*

**p.e.**

a scull is to rowing as a -------- is to yachting.
*October 25, 2012*

**Calculus**

Assuming that f and g are functions differentiable at a (though we do not know their formulas). Prove that f +g is differentiable at a using the definition of the derivative.
*October 15, 2012*

**Physics**

A dog running in the +y-direction at 6.0 hears its owner call from behind, and 2.7 later it's running at the same speed in the opposite direction. Calculate the dog's change in velocity. Calculate the average acceleration
*October 12, 2012*

**Calculus**

F(x)=|x-5| evaluate the following limits lim x->5- ( f(x)-f(5))/(x-5) lim x->5+ ( f(x)-f(5))/(x-5)
*October 10, 2012*

**physics**

A wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces at 16 º angle on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 19.5 N, what is the magnitude ...
*September 14, 2012*

**physics**

A 316-kg boat is sailing 12.0° north of east at a speed of 1.60 m/s. 39.0 s later, it is sailing 36.0° north of east at a speed of 4.00 m/s. During this time, three forces act on the boat: a 31.4-N force directed 12.0° north of east (due to an auxiliary engine), a ...
*September 14, 2012*

**Physics**

Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are different. Suppose that the...
*August 31, 2012*

**Health**

I believe the correct answer is C. increase;reduce?
*August 30, 2012*

**Health**

I put D down and got it wrong.
*August 6, 2012*

**Physics**

A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 3.9 s later. If the speed of sound is 340 m/s, how high is the cliff? i know you use the equation y=(initial velocity)(time) + (1/2)(acceleration)(time^2) but I'm having problems putting all...
*July 2, 2012*

**Science**

What happens to approximately 60% of the energy released during the complete oxidation of glucose? A) It is used to synthesize more ATP. B) It is reused to supply the energy for anabolic reactions. C) It is stored in the body as fat. D) It is lost by the body in the form of heat
*June 21, 2012*

**science**

In a micelle, why do you find the fatty acid chains of the of the phospholipid molecule are on the inside of the bilayer?
*May 26, 2012*

**vulindlela**

I believe that the correct answer is B. Physical activity.
*May 22, 2012*

**Calculus**

How do you use imlicit differentiation to differentiate e^(xy)? I have the problem "use implicit differentiation to find dy/dx. e^(xy)+ x^2 - y^2 = 10. I've gotten to the point whereI have d/dx(e^(xy)) + 2x - 2ydy/dx = 0, but I can't go any further because I don&#...
*May 22, 2012*

**Calculus I**

Okay, thanks guys!
*May 21, 2012*

**Calculus I**

Find the derivative of y=ln((1+e^x)/(1-e^x)) I know that the derivative of y=ln(1+e^x) would be (e^x)/(1+e^x), but I'm not sure what to do with the 1-e^x on the bottom here. Can someone help please? Thanks!
*May 21, 2012*

**Chemistry help PLEASE!!!**

The solubility of AgCl(s) in water at 25 C is 1.33x10^-5 M and its deltaH of solution is 65.7 kJ/mol . What is its solubility at 60.1 C ? Please explain how to solve for this!!
*April 20, 2012*

**fourth grade math**

if two dice are rolled together,which outcome is more likely-dots totaling 12 or dots totaling 7? explain you anser.
*April 12, 2012*

**Math**

Delia works from 8:00 a.m. to 4:30 p.m. and has one hour each day for lunch. How much does she earn for a five-day workweek at $4.80 per hour?
*March 1, 2012*

**social studies**

Were cassette tapes famous when they first came out?
*February 28, 2012*

**math**

Just pick 3 mid sized cars.
*February 20, 2012*

**algebra 2**

The answer is y=2x+7. First put it in point slope form then solve it into slope-intercept form. Use the same slope because having parallel lines means the same slope.
*February 10, 2012*

**biology**

A dominant gene A produces wire-haired texture in dogs. Its recessive aamllele a produced smooth hair. Cross the heterozygous wire-haired dog with homozygous smooth-haired dog. List the genotype and phenotype ratios of all the possible offspring.
*January 21, 2012*