Saturday

April 25, 2015

April 25, 2015

Total # Posts: 817

**chemistry**

The rate law of the overall reaction. A + B -> C is rate = k[ A ]^2 Which of the following not increase the rate of a chemical reaction? a) increasing the temperature of the reaction b)increasing the concentration of reaction A c)adding a catalyst for the reaction d)...
*November 18, 2010*

**chemistry**

A possible mechanism for the overall reaction Br2 (g) + 2NO (g) -> 2NOBr (g) is NO (g) +Br2 (g) (equilibrium arrows: on top it says k1 and on bottom k-1) NOBr2 (g) (fast) step 1 NOBr2 (g) + NO (g) ->(on top of arrow k2) 2NOBr (slow) step 2 the question: which of the ...
*November 18, 2010*

**math**

if you drive 117 miles in 2 1/4 hours, what is your average speed?
*October 31, 2010*

**math**

BLIND BATS AT HALLOWEEN There were number of bats in a cave. Two bats can see out of right eye, Three bats can see out of left eye, Four can't see out of left eye, and Five can't see out of right eye. What is the least number of bats in the cave & what might their ...
*October 26, 2010*

**chemistry**

Why did i get this question wrong? its about a u shaped tube with a simepermeable membrane 0.3 M Fe (NO3)2 <~ U ~> 0.5 M sugar 0.1 M NaCl So I did this: 0.3 x3 = 0.9 0.5x1=0.5 0.1x2=0.2 = 0.7 so i chose the answer increase in the water level to the left side of the tube...
*October 26, 2010*

**chemistry**

The question below, i was wondering if it decrease because the N2 is on the right and so to add to left it would be too much so it gets rid of it by decreases and doing to the right? because the left side is (+) endothermic? sorry im a little confused. if the number was ...
*October 25, 2010*

**Chem**

How can i determine that the volume is decreasing? Of the following equilibria, only ??? will shift to the left in response to a decrease in volume. A) 2HI <->(g) H2 (g) + I2 (g) B) N2 (g) + 3 H2 (g)<-> 2 NH3 (g) C) 4 Fe (s) + 3 O2 (g)<-> 2 Fe2O3 (s) D) 2 SO3...
*October 25, 2010*

**Statistics**

In a poll of 1,004 adults, 93% indicated that restaurants and bars should refuse service to patrons who have had too much to drink. Construct the 90% confidence interval for the proportion of all adults who feel the same way.
*October 24, 2010*

**chemistry**

to calculate Ea i solved for slope and i got -7.6111x10^3 so i did this for Ea: 7.61x10^3 x 8.314/mole= 63.3 KJ/Mol but someone told me im missing the number 2.30? that i have to mulitply (2.30)(8.314)(7.61x10^3)=? which is right? to get the original -7.6 answer i used the two...
*October 24, 2010*

**chemistry**

to get the original -7.6 answer i used the two lowest two points here and subtracted: x y 3.50E-03 -11.7 3.14E-03 -8.96 3.28E-03 -9.75 (-11.7) - (-8.96) -------------------------- (3.50x10^-3)-(3.14 x10^-3) = -7.6111x10^3
*October 24, 2010*

**chemistry**

to calculate Ea i solved for slope and i got -7.6111x10^3 so i did this for Ea: 7.61x10^3 x 8.314/mole= 63.3 KJ/Mol but someone told me im missing the number 2.30? that i have to mulitply (2.30)(8.314)(7.61x10^3)=? which is right?
*October 24, 2010*

**chemistry**

to calculate Ea i solved for slope and i got -7.6111x10^3 so i did this for Ea: 7.61x10^3 x 8.314/mole= 63.3 KJ/Mol but someone told me im missing the number 2.30? that i have to mulitply (2.30)(8.314)(7.61x10^3)=? which is right?
*October 24, 2010*

**chem help**

im doing a graph for chem lab with excel. my classmate created a graph with these coordinates: X: 3.50 X10^-3 3.14X10^-3 3.28X10^-3 Y: -11.7 -8.96 -9.75 They got R2=0.998 but i got y = -3074.9x R² = 0.6291 why is it wrong. im desperate please help! screen shot of my graph...
*October 23, 2010*

**economics**

why might an economist look at hundreds of cars moving along an assembly line and call it an example of scarcity
*October 19, 2010*

**chemistry**

is rbi2 an ion?
*October 13, 2010*

**chemistry**

Use bond energies to predict the molar enthalpy of combustion of acetylene gas. 2C2H2 + 5O2--> 4CO2 + 2H2O I am confused as to how to do the 2C2H2 in relation to the bonds? how many c-c bonds would there be, or would they be triple bonds?
*October 11, 2010*

**chemistry**

Naturally occuring boron is 80.20% boron-11 and 19.80% of some other isotopic form of boron. What must be the atomic mass of this second isotope be in order to account for the 10.81 amu average atomic mass for boron?
*October 10, 2010*

**8th grade**

what do you call someone who cant turn pancakes?
*October 6, 2010*

**physics**

A dart gun is fired while being held horizontally at a height of 1.00 m above ground level and while it is at rest relative to the ground. The dart from the gun travels a horizontal distance of 5.00 m. A college student holds the same gun in a horizontal position while sliding...
*October 3, 2010*

**keyboarding**

You're putting together a memo and have additional material to staple to it. What word should you type below the reference initials?
*October 1, 2010*

**calculus**

Use the function defined below to calculate the indicated derivative. f(t)= 4/(t^3)+3 what is f''(2) (second derivative) Need help!!
*September 22, 2010*

**CHEM**

oops, thanks for the help!
*September 16, 2010*

**CHEM**

The vapor pressure of pure water at 25 °C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 °C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non-electrolyte, MW = 60.0 g/mol) in 75 g of water. where have i made a mistake? 35g/60=0....
*September 16, 2010*

**About Chemistry **

The vapor pressure of pure water at 25 °C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 °C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non-electrolyte, MW = 60.0 g/mol) in 75 g of water. im not sure about the steps for ...
*September 15, 2010*

**Chemistry**

Calculate the amount of heat required to raise the temperature of a 54 g sample of water from 5°C to 20.°C.
*September 15, 2010*

**math**

0.331,0.332,0.333
*September 15, 2010*

**Chemistry**

What is the formula of a substance that contains 0.0920 g of C and 0.0180 g of H?
*September 7, 2010*

**math**

One of the angles of a right triangle measures 30°, and the hypotenuse is 10 inches long. How long is the side opposite the 30° angle?
*September 5, 2010*

**geometry**

The side of a triangle opposite a 58° measures 15 inches. To the nearest hundredth of an inch, what is the length of the side opposite a 53° angle
*September 5, 2010*

**Calculus**

No. I have no idea how to do this. I did part a and part be right but i cant do this part c
*September 3, 2010*

**Calculus**

Compute the average velocity over time intervals [4, 4.01] , [4, 4.001] , [4, 4.0001] , [3.9999, 4] , [3.999, 4] , [3.99, 4] . Use this to estimate the object's instantaneous velocity at t=4 V(4) = ???? ft/ec How do i even approach this problem?
*September 3, 2010*

**Calculus**

How do I find the instantaneous ROC at x=1.5
*September 3, 2010*

**English (E-mail Writing)**

Thanks a ton for the link, I really appreciate it!
*July 27, 2010*

**English (E-mail Writing)**

Oh wow, thanks a lot. I guess I was looking for something longer, because her e-mail was a good 6 paragraphs or so. When writing these sorts of e-mails, is there a trick to make it seem more formal and not informal?
*July 27, 2010*

**English (E-mail Writing)**

I want to do some research with a professor on campus, but I'm having a lot of trouble composing this e-mail. She sent me a long e-mail with stipulations for joining her lab and at the end it basically says "If you agree to all this, let me know and we'll set up a...
*July 27, 2010*

**college math213**

Try putting the parentheses around two numbers and figure out what you get. Don't forget that you do operations in parentheses first. For example: 16-7+5=4 You could do: (16-7)+ 5 = 4 OR 16-(7+5) = 4 Which one would be right?
*July 27, 2010*

**Physics**

A machine carries a 4.5 kg package from an initial position of di = (0.50 m) + (0.75 m) + (0.20 m) at t = 0 to a final position of df = (7.60 m) + (12.0 m) + (7.30 m) at t = 11 s. The constant force applied by the machine on the package is F = (2.00 N) + (4.00 N) + (6.00 N...
*July 22, 2010*

**math**

(x^4 - 8x^2 + 15) = (x^2-3)(x^2-5) so there will be a (x^2-3) term in the numerator and denominator that will cancel leaving (x^2-5)
*July 17, 2010*

**Pythagorean Theorem**

40 cm
*July 15, 2010*

**ap chemistry**

yeah sorry
*July 7, 2010*

**ap chemistry**

The vitamin niacin can be isolated from lover, yeast, milk, and whole grain. Which source would be the best for a multivitamin tablet
*July 7, 2010*

**algebra**

if x varies inversely as w, and z=40 when w=.06, fine z when w=20
*June 24, 2010*

**american government**

2. In federalism, the national government (Points : 1)
*June 23, 2010*

**physics **

Two packages at UPS start sliding down the 20° ramp shown in Figure P8.25. Package A has a mass of 3.5 kg and a coefficient of friction of 0.20. Package B has a mass of 10 kg and a coefficient of friction of 0.15. How long does it take package A to reach the bottom?
*June 16, 2010*

**Computer Science JAVA FUNCTIONS**

Write a Function You will be given one of the following problems to solve using and writing Python functions. Given a list of words, return an array which indicates the frequency that each letter occurs. For example, in the list [”apple”, ”bob”], [ ’a...
*May 31, 2010*

**computer science**

Hey I have three questions with creating these methods can any of you guys write an example code for this? Thanks Write a Function You will be given one of the following problems to solve using and writing Java functions. 1. Given a list of words, return an array which ...
*May 28, 2010*

**computer science**

Hey I have three questions with creating these methods, thanks. Write a Function You will be given one of the following problems to solve using and writing Java functions. 1. Given a list of words, return an array which indicates the frequency that each letter occurs. For ...
*May 28, 2010*

**algebra**

length and width of a rectangle A=198 in width =x length =x+7
*May 15, 2010*

**physics**

The potential energy stored in the compressed spring of a dart gun, with a spring constant of 36.00 N/m, is 0.880 J. Find by how much is the spring is compressed.
*May 10, 2010*

**physics**

The potential energy stored in the compressed spring of a dart gun, with a spring constant of 36.00 N/m, is 0.880 J. Find by how much is the spring is compressed.
*May 10, 2010*

**physics**

The potential energy stored in the compressed spring of a dart gun, with a spring constant of 36.00 N/m, is 0.880 J. Find by how much is the spring is compressed.
*May 10, 2010*

**geometry**

the slope of a line that is perpendicular to (2,4) and (-1,0) is
*May 10, 2010*

**economics**

Suppose velocity is stable, What would the Federal Reserve need to know in order to keep output at its natural level following a supply shock?
*May 3, 2010*

**phys101**

The heat-energy needed to produce any temperature change in the liquid is: DeltaH = mass x heat-capacity x DeltaT where DeltaT is the change in temperature. The heat-energy needed to melt the ice is: Hmelting = mass x heat-of-fusion Lets assume the final temperature is 'T...
*April 29, 2010*

**alegbra **

The answers are all coordinates in this format: (x,y) The first equation y=0, means that the answer looks like this: (x,y=0) or (x,0) If y=0, you can replace y in the second equation so you get x=0+2=2 So x=2. Answer: b) (x=2,y=0) or (2,0)
*April 29, 2010*

**science**

Describe the bonds that "un-zip" during the replication of dna.
*April 26, 2010*

**science**

Describe the bonds that "un-zip" during the replication of dna.
*April 26, 2010*

**9th grade English**

you need an apostrophe on "Tybalts" in the last line. Nice job
*April 7, 2010*

**8th grade algebra**

exponent of 1000
*March 30, 2010*

**american intercontinental university**

The fresh water should taste sweet because of the sugar residue left in your mouth
*March 30, 2010*

**Algebra**

2x-6y<18 when I change this to the other form I get y>-2/6+(-3)but when I graph it all the points come out = to instead of > than. What am I doing wrong.
*March 30, 2010*

**6th grade Language Arts**

We made a compromise
*March 30, 2010*

**chemistry**

Thank you very much for your time.
*March 15, 2010*

**chemistry**

Nitroglycerine decomposes according the the equation: 4C3H5(NO3)3 -> 12 CO2 + 10 H2O +6N2 + O2. 15.0 g of nitroglycerine is placed in a 500 ml flask at 25.0 C. The vapor pressure of water at this temperature is 23.8 mmhg. Find the total pressure in the flask after the ...
*March 15, 2010*

**physics**

rofl do you go to W-L?
*March 10, 2010*

**Physics**

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...
*March 7, 2010*

**Physics**

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...
*March 7, 2010*

**math algegra**

one type of probablity used practically daily is?
*February 27, 2010*

**Math**

how do you solve: 2A^2-7a-15
*February 24, 2010*

**Mathematics**

Thanks. i worked it out and it came out to = 4 liters
*February 24, 2010*

**geography**

what is china's culture? please give examplesa Thank you!
*February 23, 2010*

**Chemistry**

A sample of .234g of carbon is placed in a closed stainless steel bomb with .502g of of oxygen gas. The mixture is ignited giving of carbon dioxide. How many grams of carbon dioxide should be obtained upon combustion?
*February 21, 2010*

**Finance**

John borrowed $1,000 discounted at 10% for six months. How much did he receive when the loan was made? I get $952.38 by using the formula below: 1000=P(1+.10/2)^(.5*2) - am I doing this right?
*February 18, 2010*

**Finance**

Determine the amount of each payment to be made to a sinking fund in order that enough money will be available to pay off the following loan. $29,000 loan, money earns 12% compounded annually, 42 months. I tired doing this using the future value of an ordinary annuity formula...
*February 18, 2010*

**Economics**

This chart shows the components of nominal GDP for the years 2000 and 2001. All figures are in billions of current dollars. Components 2000 2001 Consumption $6,684 $6,987 Investment $1,755 $1,560 Government Spending $1,751 $1,858 Exports $1,101 $1,034 Imports $1,467 $1,383 ...
*February 7, 2010*

**Economics**

What percentage of GDP in 2000 is consumption
*February 7, 2010*

**Math (repost)**

In standard form, find the equation of the circle that passes through the origin and x-intercept 1 and y-intercept 2. (I fixed a correction a little too late after a response.) Help please? thanks!
*February 7, 2010*

**Physics**

Calculate the speed needed by a spacecraft to maintain a circular orbit at about 350 km above Earth’s surface. (it's a project where we create our own spaceship. let's say the craft is 500kg) --- Not sure about the formula to find this. All I know is that it may ...
*February 6, 2010*

**Math**

woah, oops. the y-intercept is 2.
*February 6, 2010*

**algebra**

You can work a total of no more than 34 hours per week at your two jobs. House cleaning pays $8 per hour and your sales job pays $6 per hour. You need to earn at least $245 per week to cover your expenses. Write a system of inequalities that shows the various numbers of hours ...
*February 4, 2010*

**chemistyr**

0.115
*February 2, 2010*

**math/probability**

the anwser is 4
*January 15, 2010*

**Pre-algebra**

nope,I'm not very good in math as well :(
*December 13, 2009*

**Social Studies**

What is the Socratic Method?
*December 13, 2009*

**Pre-algebra**

hi,are you good at World History?
*December 13, 2009*

**Social Studies**

Um excuse me,could you help me with this one problem I have?I don't understand it
*December 13, 2009*

**science**

Hi, quick question: Graphite is burned in oxygen to give carbon monoxide and carbon dioxide. If the product mixture is 33% CO and 67% CO2 by mass, what is the heat from the combustion of 1.00 g of graphite? dH values: CO:-110.5 kj/mol, CO2: -393.5 kj/mol Thanks!
*November 24, 2009*

**Calculus**

Use linear approximation, i.e. the tangent line, to approximate 8.4^(1/3) as follows: Let f(x)= x^(1/3) . The equation of the tangent line to f(x) at x=8 can be written in the form y=mx+c where m=1/12 and c=4/3: Using this, find our approximation for 8.4^(1/3).
*November 15, 2009*

**AP Chem**

This post helped immensely, thank you so much and merry Christmas!
*November 12, 2009*

**science**

which of earth's spheres extends into all others
*November 11, 2009*

**Math**

Use linear approximation, i.e. the tangent line, to approximate sqrt[3] { 8.4 } as follows: Let f(x) = sqrt[3] x. The equation of the tangent line to f(x) at x = 8 can be written as y=mx+c where m=1/12 b=4/3 find the approximation for sqrt[3] {8.4}
*November 8, 2009*

**8th grade**

Please Help Me. I'm doing a Science Fair Project, and I need help with finding simmilar experiments to mine. My experiment is: Which saliva is cleaner: Cat, Dog, or Human???
*October 28, 2009*

**world history**

why did the industrialized nations of the world embark so aggressively upon imperialist ventures between 1880 and 1914?
*October 26, 2009*

**Physics (Rotational Kinetic Energy)**

Hello, The question is: A solid ball rolls along the floor with a constant linear speed v. Find the fraction of its total kinetic energy that is in the form of rotational kinetic energy about the center of the ball. Krot/Ktotal = ? The answer I keep getting is 3/1, but the ...
*October 21, 2009*

**psychology**

It also depends on the habituation of the stimulus. Rather than conditioned excitation, you would get conditioned inhibition here.
*October 21, 2009*

**Biology**

How is the expression of sex-linked genes similar and different from the expression of autosomal genes?
*October 21, 2009*

**Biology**

How is the expression of sex-linked genes similar and different from the expression of autosomal genes?
*October 20, 2009*

**french**

YOU legs hurt?
*October 20, 2009*

**English**

free verse does not mean don't use needed punctuation or capitalization. As I searched for examples of free verse, I found many that didn't have punctuation (which caused ideas and thoughts to run together) and didn't have capitalization, which distracts from the ...
*October 20, 2009*