Friday

November 28, 2014

November 28, 2014

Total # Posts: 1,691

**US**

In 1938 Mexico nationalized America's oil, according to my textbook. What does this mean? I don't get what exactly they did.
*March 29, 2010*

**Chem**

I'm still not getting the correct answer: i have 2.00g/180.15g/mol =1.11*10^-2 1.11*10^-2/.6=1.85*10^-3 and (2.4_10^-3)^2/1.85*10^-3 = 3.11*10^-9. what am i doing wrong?
*March 28, 2010*

**Chem**

Aspirin (acetylsalicylic acid, ) is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolved 2.00 g of aspirin in 0.600 L of water and measured the pH . What was the Ka value calculated by the student if the of the pH of the solution was 2.62? I...
*March 28, 2010*

**chem**

Thank you for your help! That website did clarify things a bit. Thanks again!
*March 28, 2010*

**chem**

classify each of the following as a lewis acid or base: Cl- BeCl2 B(CH3)3 P(Ch3)3 Cl- is an acid right? i'm not sure i understand this concept very well. :[ and i tried looking at my notes already.
*March 28, 2010*

**College Chemistry**

Given the following equilibrium constants, Ka (NH4^+)=5.6*10^-10 Kb (NO2^-)=2.2*10^-11 Kw=1.00*10^-14 determine the equilibrium constant for the reaction below at 25*C. NH4^+(aq)+NO2^-(aq)f HNO2(aq)+NH3(aq)
*March 25, 2010*

**College Chemistry**

pH=pKa + log(base/acid) 3.95=3.465 + log(base/acid) .494=log(base/acid) 10^.494 3.1
*March 23, 2010*

**College Chemistry**

Never mind, I figured it out.
*March 23, 2010*

**College Chemistry**

Calculate the ratio of NaF to HF required to create a buffer with pH=3.95. Also, can you please explain in a nutshell the whole concept of buffers? Thanks!
*March 23, 2010*

**world issues**

which countries give money or military support to Syria?
*March 23, 2010*

**Chem**

Consider this reaction: CO (g) + H2O (g0 <---> CO2(g)+H2(g) kc=102 at 500 K A reaction mixture initially contains 0.145 M of CO and 0.145 M of H20. What would be the equilibrium concentration of [CO]? I so far have kc= [H2][CO2]/[CO][H2O]= 102 I know i have to set up an ...
*March 21, 2010*

**Algebra**

Use a graphing calculator, it would be super easier dude.
*March 19, 2010*

**Math**

Find the vertex of the parabola given by f(x) = x^2 - 3x + 4 My answer was (3,13). Am I correct?
*March 19, 2010*

**Math**

Find th evertex of the parabola given by f(x) = x^2 - 3x + 4 My answer was (3,13). Am I correct?
*March 19, 2010*

**Chemistry**

sorry i did not mean to submit this question multiple times, my internet connection is low and i didn't think it went through. i apologize.
*March 18, 2010*

**Chemistry**

Could you please find my mistake in this problem? I'm not getting the right answer. :[ Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have...
*March 18, 2010*

**Chemistry**

Could you please find my mistake in this problem? I'm not getting the right answer. :[ Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have...
*March 18, 2010*

**Chemistry**

Use the reactions below to predict the equilibrium constant for the reaction 2A(g)<->3D(g) A(s)<->1/2B(g)+C(g) k1=0.0334 3D(g)<->B(g)+2C(g) k2=2.35 I know that you have to make modifications according to the stoichiometric coeffecients. So do I divide k1 by 2...
*March 18, 2010*

**algebra**

Evaluate whether a prepaid or monthly cell phone plan is most effective for a customer that uses x weekday minutes per month. I can make up my own numbers for each plan. Having problems making up the equations.
*March 16, 2010*

**spanish**

In Spain, all hotels are new and modern buildings? True or false.
*March 15, 2010*

**College Math **

Find the exact value of: sin [2sin^-1 (-sq rt (3)/2)] how do i answer this question? i don't know how to find the answer.
*March 15, 2010*

**college math**

The range can be found by plugging the values of the domain in the equation. For example, 3/(-3-6)=-1/3 -1/3 is part of the range because the range represents the outputs or y values that correspond to the inputs (the domain), or x values
*March 15, 2010*

**Trig**

How do I solve the following? sec 3 theta/2 = 2 on the interval 0<theta<2 pi? I tried to look in my textbook but it doesn't have an example. I also tried google and I was unsuccessful> How do I do this question? I know that the period for sec is 2 pi but I don'...
*March 14, 2010*

**Chemistry**

For a reversible reaction where A + B (both arrows) C + D, the equilibrium constant is represented by kc = 5.3 = (c)(d)/(A)[B]. Initially A and B are present at 2.00 M each. What is the final concentration of A once equilibrium is reached. I made an ICE table and came up with ...
*March 11, 2010*

**Chemistry**

thanks, i double checked and everything looks right. i'm going with answer d. thank you again!
*March 11, 2010*

**Chemistry**

2H2 (g) + O2 (g) <---> 2H2O (g) what is the likely magnitude of the equilibrium constant? a) k < 10 ^-3 b) 10^-3<K<10^3 c)k=0 d)k>10^3 i know that choice c is incorrect because if k=o there would be no need to calculate equilibrium, but how would i go about ...
*March 11, 2010*

**College Chem II**

Determine the [H3O+] of a 0.160M solution of benzoic acid.
*March 7, 2010*

**College Chemistry**

THANK YOU!
*March 7, 2010*

**College Chemistry**

Thanks for your help! I understand number 2, but I still don't get number 1. Is there any other way to explain it?
*March 7, 2010*

**College Chemistry**

What is the pH of the following solutions? 1)a solution that is 5.4×10−2 M in HClO4 and 3.0×10−2 M in HCl 2)a solution that is 1.80% HCl by mass (Assume a density of 1.01g/mL for the solution.) Please help! I am so confused!
*March 7, 2010*

**CHEMISTRY**

Is non-dairy creamer a colloidal dispersion
*March 7, 2010*

**CHEMISTRY**

Would non-dairy creamer also be a colloidal dispersion when placed in water?
*March 7, 2010*

**CHEMISTRY**

If a pinch of flour is placed in water, does it form a coarse suspension, colloidal dispersion, or true solution? What about pepper? I thought both would be a coarse suspension
*March 7, 2010*

**CHEMISTRY**

Would non-dairy creamer also be a colloidal dispersion if it is put in water?
*March 6, 2010*

**CHEMISTRY**

When powdered milk is added to water, is it a coarse suspension, true solution, or colliodal dispersion? What about baking soda in water?
*March 6, 2010*

**physics**

Water flows over Victoria Falls, which is 128 m high, at a rate of 1.4 x 106 kg/s. If half the potential energy of this water were converted into electric energy, how much electric power would be produced by these falls?
*March 4, 2010*

**Math**

Ok i got that too... it comes to a fraction but then when you check it in the equations you don't get the same answer.
*February 28, 2010*

**Math**

Solve the system of linear equations by elimination. Thank You for your help. 8x+10y=3 3x-5y=2
*February 28, 2010*

**math**

6 6 6 6 = 5 fill in the expressions to make this equation true
*February 28, 2010*

**Calc**

how do i begin to solve this? integral of (1/x^2)sec(1/x)tan91/x)dx I tried substituting tan(1/x) for u but i couldn't get it to work...
*February 27, 2010*

**Calc**

that is actually the answer (that my book gives) how did you get that??
*February 27, 2010*

**Calc**

How do i begin to solve this? integralof dx/(cube root of 3x+4)
*February 27, 2010*

**Geometry**

B (i think)
*February 24, 2010*

**Physics**

Two blocks are connected by a light string passing over a pulley. The inclined surfaces are frictionless, and the effects of the pulley can be ignored. The value of m1 = m2 = 1.0 kg and θ2 = 43.4 degrees. If the blocks accelerate to the right with acceleration a = 0.280 m...
*February 23, 2010*

**physics**

Small, slowly moving spherical particles experience a drag force given by Stokes’ law: where r is the radius of the particle, is its speed, and η is the coefficient of viscosity of the fluid medium. (a) Estimate the terminal speed of a spherical pollution particle of...
*February 19, 2010*

**math**

MIX W 5 CUPS CONCENTRATE AND 8 CUPS COLD WATER. SUPPOSE YOU MAKE ONLY 1 CUP OF MIX W. hOW MUCH WATER AND HOW MUCH CONCENTRATE DO YOU NEED?
*February 16, 2010*

**english composition **

i have a hard time understanding to write essay and start paragraph
*February 13, 2010*

**college**

how do you start with an essay with contrast and compare about your life now and five years ago ?
*February 13, 2010*

**statistics**

If ten households in this area are selected at random, what is the probability that exactly two of them will be in violation of this law?
*February 11, 2010*

**Physics**

If you can throw a ball vertically upward to a height h = 30.5 m, what is the maximum horizontal range over which you can throw the same ball, assuming you throw it at the same initial speed?
*February 8, 2010*

**Physics**

A rock thrown horizontally from the top of a radio tower lands 20.0 m from the base of the tower. If the speed at which the object was projected was 11.50 m/s, how high is the tower?
*February 8, 2010*

**physics**

A ball is thrown upward from a platform 4.6 m high with a speed of 23 m/s at an angle of 40 o from the horizontal. What is the magnitude of its velocity when it hits the ground?
*February 8, 2010*

**AP world history**

Okay thanks, I'm writing a document based question and my teacher isn't very good at helping me with anything. I found the religions they gave me to work with so not helpful or relative to each other in anyway.
*February 7, 2010*

**AP world history**

Religions of common geographic origins tend to differ from others that originate in other areas of the world. How do religions having common geographic origins tend to share somewhat common codes of behavior and views or the nature and reason for existence?
*February 7, 2010*

**chemistry**

I put down that there are 98 protons, 3 neutrons
*February 4, 2010*

**chemistry**

State everything you know about the following atoms. Do NOT assume that they are balanced or neutral. Atomic number = 98 Mass number = 101
*February 4, 2010*

**Physics-College**

You have a 50V battery in a circuit with a single resistor R. If the resistor dissipates 200 J of energy in 5 seconds, what is its resistance?
*February 4, 2010*

**College Physics**

For the speed at which the ball was launched I got 18.12m/s. That part was right according to the computer. I didn't understand parts b or c of the question. For part a you multiplied vt by .608 instead of .6018 and that is why I got a different answer. Could you explain ...
*February 1, 2010*

**College Physics**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*February 1, 2010*

**college Physics**

The coordinates of an object moving in the xy plane vary with time according to the following equations x = −7.16 sin ùt and y = 4.00 − 7.16 cos ùt, where ù is a constant, x and y are in meters, and t is in seconds. Write expressions for the ...
*January 31, 2010*

**college Physics I**

I have tried to put the numbers in the equation, but I am not getting the correct answer. Is there an easier way to explain it?
*January 29, 2010*

**college Physics I**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*January 29, 2010*

**college Physics**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*January 29, 2010*

**math/probability**

Assume that the weight loss for the first two months of a diet program has a uniform distribution over the interval 6 to 12 pounds. Find the probability that a person on this diet loses more than 11 pounds in the first two months.
*January 24, 2010*

**Chem Apps**

The solubility of sugar (surcose) in water is 4.0 g/mL at room temperature, what is the maximum amount of sugar that will dissolve in 850 mL of water?
*January 21, 2010*

**Chemistry**

The mass percent of a three component gas sample is 95.2% PF5, 1.40% C2H2 and 3.40% C3H6. Calculate the partial pressure (atm) of PF5 if the total pressure of the sample is 570.0 torr.
*January 20, 2010*

**4th grade**

I need to know I good way to do long division. The problem is: It takes 14 oranges to make a small pitcher of juice. Annette has 112 oranges. How many pitchers of juice can she make?
*January 20, 2010*

**spanish**

What does this mean: Cantas en el coro?
*January 14, 2010*

**Statistics**

I have to analyze a statistical research paper and have never done so. How do I analyze statistical data and where do I find sources to support my analysis?
*January 14, 2010*

**Social studies**

What word means to be the best in trade? None of my notes tell me this
*January 13, 2010*

**Cultural Diversity**

when looking for your community would you look up by the town in which you live in
*January 12, 2010*

**Math**

A square is inscribed in a circle of radius r. Express the length of the side of the square in terms of r.
*January 11, 2010*

**Calculus**

The function f is continuous on the closed interval [1,7] and has values in the table below x f(x) 1 10 4 30 6 40 7 20 Usinf the subintervals [1,4] [4,6] [6,7] what is the trapezoidal apporx. of the integral from 1 to 7 of f(x)dx? The answer: 160 I tried doing each interval as...
*January 11, 2010*

**Calculus**

Alright, I found -1/4cos(x)^4 but I didn't get the right answer. Did I dint the wrong anti-derivative? Do I have to do reverse chain rule and get... (-1/4cos(x))sin(x)^4?
*January 11, 2010*

**Calculus**

Let F(x) be an antiderivative of sin^3(x). If F(1)=0 then F(8)=? The answer: 0.632 How do I get to that answer? Do I find the antiderivatie and solve for F(x) when x=8?
*January 11, 2010*

**Calculus**

If the integral from a to b of f(x)dx=a+2b then integral from a to b of (f(x)+3)dx= ? The answer: 5b-2a How do I get to that answer??
*January 11, 2010*

**Math**

If cosx=sqrt{3}/2 and −pi/2<=x<=0 then the exact value of x, in radians
*January 10, 2010*

**elementry math **

A box contains three black balls and two gold balls. A ball is selected at random, its color is recorded, and it is then replaced. A second ball is then selected at random and its color recorded. The outcome associated with this type of selection is an ordered pair (first draw...
*January 10, 2010*

**World History**

In what ways were the great civilizations of the New World similar to those of the Old World?
*January 8, 2010*

**Chemistry**

How do you calculate the molar masses for Strontium Phosphate and Chromium(III)Nitride using significant figures correctly?
*January 3, 2010*

**chemistry**

Hi there, I am having a problem with this question, any help would be great. Use the following balanced chemical equation to calculate the mass of carbon dioxide produced from the burning of 5.50 kg of jet fuel which can be represented by the molecule C12H26. You should quote ...
*January 2, 2010*

**5th grade**

accb divided by ab
*December 16, 2009*

**education**

I don't understand the question or even where to find the answer. I sent an email to the teacher and shes not responding to me.
*December 12, 2009*

**education**

Write a 350- to 500-word response to the following: You have the ability to choose three or four books for your students. Based on what you have learned in this course, how can you assess the level of bias and stereotypes in the contents of these texts? What are your criteria...
*December 12, 2009*

**chemistry**

Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant. For example, the residual pressure in a can is 1.36 atm when it is sitting on a shelf ...
*December 6, 2009*

**math**

aly, its not 8 hrs......
*December 3, 2009*

**physics**

three dogs play tug-of-war with a chew toy. Each dog pulls with a force that is horizontal with the ground. Determine the net force acting on the chew toy and the acceleration of the chew toy if its mass is 325g. (ignore friction and gravity) Dog 1 pull: 48.2N at 215 degrees ...
*December 3, 2009*

**Physics**

If an object is hung from a cable with a weight of 40 N, what is the tension in the two cables? I got some answers, but it would be best if I knew if I was doing the problems correctly before I do the rest of the worksheet. I did a bunch of work, but it's really messy so I...
*December 2, 2009*

**reading/writing**

I have to pick a creative selection such as a painting, political cartoon, or lyrics form a song, poem etc, and I need to complete the following. 1. What observations I can make about this selection 2. What questions can I develop form these observations 3. What prior ...
*December 2, 2009*

**Math**

Is 3x-4=12 a linear equation? i know that 3x=16 but would that be considered linear? it would just be a vertical line correct?
*December 1, 2009*

**Calculus**

An airplane flies at an altitude of 5 miles toward a point directly over an observer. The speed of the plane is 600 mi/hr. Find the rate at which the angle of elevation is changing when the angle is 30 degrees. I found the answer to be 60 radians/hr by taking the derivative of...
*November 19, 2009*

**Physics**

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.75 m and cross the bar with a speed of 0.63 m/s?
*November 18, 2009*

**Physics **

An astronaut stands on the edge of a lunar crater and throws a half-eaten Twinkie™ horizontally with a velocity of 2.2 m/s. The floor of the crater is 95.4 m below the astronaut. What horizontal distance will the Twinkie™ travel before hitting the floor of the crater...
*November 9, 2009*

**spanish**

how do u anwser this question in spanish ¿Qué haces los sábados?
*November 7, 2009*

**English**

gxuwer6dydgusawutdfugasufgusgufguageydfusdgfusgdugudgufgdgufsguftutdefuystfugdsudgfudsgugfusdgfusgu
*November 3, 2009*

**math **

Find the z-score for the given raw score, mean, and standard deviation. Assume a normal probability distribution. Raw score = 15, ì = 16 , and ó = 2
*November 1, 2009*

**math**

Decide which of the variables described is likely to have a normal or near-normal distribution. 3) a. The amount of change held by a teacher at the end of each day for a year b. The amount of property taxes paid by homeowners in a new "affordable housing" subdivision...
*November 1, 2009*

**social studies**

unscramble artiotinm
*October 30, 2009*

**math**

nevermind
*October 27, 2009*

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