Saturday

February 6, 2016
Total # Posts: 1,515

**Chemistry**

2N2O(g) → 2N2(g) + O2(g) d[N2O]/dt = -5.8×10-4 M/s at a particular temperature and set of concentrations. What are d[O2]/dt and d[N2]/dt? d[O2]/dt = d[N2]/dt = What is the rate of the reaction? my answer for the first one im getting -.00016 and the second one 2.9e-...
*September 29, 2010*

**DrBob222**

2N2O(g) → 2N2(g) + O2(g) d[N2O]/dt = -5.8×10-4 M/s at a particular temperature and set of concentrations. What are d[O2]/dt and d[N2]/dt? d[O2]/dt = d[N2]/dt = What is the rate of the reaction? my answer for the first one im getting -.00016 and the second one 2.9e-...
*September 29, 2010*

**geography**

name at least 5 bodies of water ? what are they thank you
*September 29, 2010*

**Math homework**

oh... 3-(-4+8)=3-[-4+(-8)] 3-(-12) 3+12 15=3-[-4+(-8)] 15=3+12 15=15
*September 27, 2010*

**Math homework**

what are you solving for?
*September 27, 2010*

**Math homework**

3-8+3-8+2 =-5+3-8+2 =-2-8+2 =-10+2 =-8
*September 27, 2010*

**social studies**

It was an attempt to prevent colonial tensions with Native Americans by establishing the western boundaries of the 13 coastal colonies.
*September 27, 2010*

**CHEM**

It is an alloy of copper and zinc, therefore it is a mixture, since a compound is chemically formed while an alloy is just a dissolving of one metal in another.
*September 25, 2010*

**phsyics**

A baseball is thrown straight up. The drag force is proportional to v^2. In terms of g, what is the y-component of the ball's acceleration when its speed is half its terminal speed and it is moving up? In terms of g, what is the y-component of the ball's acceleration ...
*September 23, 2010*

**Chemistry**

Why would it be better to titrate a solution rather than just dilute it?
*September 21, 2010*

**University Research-level Biology**

Hello, this is an upper-level question, and I would sincerely appreciate help before Tuesday. I am reading a journal article, and there is one conclusion in it that I do not understand. It predicts a postsynaptic mechanism when EPSP amplitudes do not vary across trials, and a ...
*September 20, 2010*

**math**

expand 9x - 36 + x = 10x - 40 + 4 put like terms on the same side 9x + x - 10x = 36 - 40 + 4 simplify 0=0 Well your question doesn't make sense.
*September 20, 2010*

**English**

6) We have afternoon classes on Tuesdays from 2pm to 4pm. 7) I prefer scientific subjects such as physics and maths to humanities. 8) We are tested orally twice a term and we get three written marks each term (is there a better way of expressing it??). 9) A calendar and an ...
*September 19, 2010*

**Math**

Hello everybody
*September 19, 2010*

**physics**

At a picnic, there is a contest in which hoses are used to shoot water at a beach ball from three directions. As a result, three forces act on the ball, F1, F2, and F3 (see drawing). The magitudes of 1 and 2 are F1 = 55.0 newtons and F2 = 95.0 newtons. Using a scale drawing ...
*September 12, 2010*

**physics**

They will hit the ground at the same time. the accelerate at the same rate of 9.8m/s^2
*September 10, 2010*

**Math**

2x cubed minus x squared minus 6x plus 3. I know the answer is (2x-1)(x squared-3). Please help me with how they got that answer. Thank you!
*September 9, 2010*

**Math**

2x cubed minus x squared minus 6x plus 3. I know the answer is (2x-1)(x squared-3). Please help me with how they got that answer. Thank you!
*September 9, 2010*

**s.s.**

Spain and Portugal
*September 9, 2010*

**Geography**

Why is Cairo an important city?
*September 9, 2010*

**9th grade math**

Correct. 3/4 times 3/4 equals 9/16
*September 9, 2010*

**Geography**

THanks
*September 9, 2010*

**Geography**

Why is rice important to the Middle East?
*September 9, 2010*

**chemistry**

If a soda can is 11.8 cm tall, how many would it take to make a stack to reach the moon?
*September 6, 2010*

**calculus**

PLEASE write 2x+y=5 in polar form. a. -sqrt5 = r cos (theta -27degrees) b. sqrt5 = r cos (theta -27degrees) c. -sqrt5 = r cos (theta +27degrees) d. sqrt5 = r cos (theta +27degrees) is the answer c.
*September 6, 2010*

**Health, Safety, and Nutrition**

a or d
*September 5, 2010*

**health**

prefix of osterperosis
*September 3, 2010*

**math**

=8-2[3-(15x+5)] =8-2[-15x-2] =8+30x+4 =30x+12
*September 2, 2010*

**Finance**

I have this same problem. I just cannot figure out if the labor content is needed to calculate the NPV. Any ideas?
*August 31, 2010*

**math116**

I need help with 3(x-1)+5=15x +7-4-4(3x+1)+ 3
*August 31, 2010*

**Math**

An equilateral triangle is one in with all three sides are length. If two vertices of an equilateral trangle (0,4) and (0,0), find the third vertex. How mant of these triangles are possible? How would you slove this??
*August 26, 2010*

**calculus**

Thanks I see where I made the mistake Thank you!
*August 17, 2010*

**calculus**

The total area enclosed by the graphs of y=10x^2–x^3+x y=x^2+19x This is a really long problem I keep getting the answer of 20.25 but it is incorrect I dont know where I am going wrong?
*August 17, 2010*

**finance**

Leggio Corporation issued 20-year, 7% annual coupon bonds at their par value of $1,000 one year ago. Today, the market interest rate on these bonds has dropped to 6%. What is the new price of the bonds, given that they now have 19 years to maturity
*August 8, 2010*

**American History**

What two colonies were resistant towards slavery?
*July 31, 2010*

**Chemistry**

If a diagram describes an initial state of the reaction A2 + B2 --> 2AB. Would the picture with more AB products represent the result at the higher temperature?
*July 17, 2010*

**Chemsitry**

I don’t understand how to write this equation. Write an equation relating the concentration for a reactant A at t=0 to that at t=t for a first-order reaction. Define all the terms, and give their units. Do the same for a second- order reaction. -Would it be the rate law ...
*July 17, 2010*

**Chemistry**

How would you solve this problem? C4H8(g)--> 2C2H4 Determine the order of the reaction and the rate constant based on the following pressures, which were recorded when the reaction was carried out 430 C in a constant volume vessel. Time (s) P(C4H8)(mmHg) 0 400 2,000 316 4,...
*July 17, 2010*

**other**

why do u say d??
*July 15, 2010*

**other**

some child psychologists have concluded that___ is the strongest predictor of both scholastic and career achievement A. physical illness b. respect for authority c. emotional well being d inherited intelligence
*July 14, 2010*

**other**

Encouraging children to eat certain foods their families enjoy aroud the holidays is an example of?
*July 13, 2010*

**College Physics**

An airplane flies 200 km due west from city A to city B and then 240 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?
*July 5, 2010*

**chemistry**

A silver ring contains 0.0134 mmol Ag. How many silver atoms does it contain?
*July 2, 2010*

**chemistry**

A silver ring contains 0.0134 mmol Ag. How many silver atoms does it contain?
*July 2, 2010*

**English**

8. We enjoyed some entertaining numbers on the program.
*June 30, 2010*

**Math**

what is .50 times 95000 lbs?
*June 15, 2010*

**chemistry**

Why moles?
*June 13, 2010*

**chemistry**

A chemical problem may be presented to you in units of moles, mass, or volume. Which one of these can be directly used in arithmetic no matter what the conditions are?
*June 13, 2010*

**marketing**

You are working in the product development department of a company that creates household products. Your team has come up with an idea for a revolutionary new cleaning product. Using the seven phases of new product development as a guide, describe how your company will develop...
*June 7, 2010*

**Stats**

A participant in a cognitive psychology study is given 50 words to remember and later asked to recall as many as he can of them. This participant recalls 17. What is the (a) variable, (b) possible values, and (c) score? I just don't understand what it all means. I've ...
*May 28, 2010*

**chemistry**

contrast ionic and molecular substances in terms of the types of attractive forces that govern their behavior
*May 23, 2010*

**English**

I can't send you my homework. What shall I do?
*May 19, 2010*

**Bus. **

P $26 X Q 14 = $ 364 - Cost $238 = $126 , Which is max Profit among those.
*May 18, 2010*

**How Children learn**

what kind of responses do behaviorists look for in their students?
*May 13, 2010*

**algebra**

find the LCM of (7 4z), (49-16zsquared), and (7-4z)
*May 13, 2010*

**math**

is the answer 2/25
*May 12, 2010*

**math**

you roll a fair number cube twice. what is the probability of rolling two 3's if the first roll is 5
*May 12, 2010*

**math**

is the answer 1/657800
*May 12, 2010*

**math**

a sock drawer contains 10 white socks, 6 black socks, and 8 blue socks. if 2 socks are chosen at random, what is the probability of getting a pair of white socks?
*May 12, 2010*

**physics**

2m/s
*May 4, 2010*

**physics**

A spherical convex mirror has a radius of curvature of magnitude of 20cm. At what distance from the mirror should an object be placed to obtain an image that is virtual, four times smaller and upright.
*May 3, 2010*

**lal**

how to say FUN in a PLURAL way my sentence is fundraising is the easiest and (fun) way in school
*April 24, 2010*

**math**

Solve for x: (4x + 1)1/2 = 3
*April 24, 2010*

**Math**

$20768 the percentage for this is 21% please help me through the formula on how this is done get 21%
*April 24, 2010*

**math**

how do do you find the percentage of $38676?
*April 24, 2010*

**quote**

what does this mean? " when you judge another you do not define them ,you define yourself."
*April 23, 2010*

**quote**

what does this quote mean? " the surest way to corrupt the youth is to instruct him to hold in higher esteem those who think alike , then those who thinks differently"
*April 23, 2010*

**singular/plural**

is it right!?
*April 23, 2010*

**singular/plural**

sara looked happy going to school, but it was odd because she hated school. maybe it had do with BOY CRUSHES
*April 23, 2010*

**singular/plural**

my entire snetence is this : sara looked happy going to school, but it was odd becuz she hated school. maybe it had to do with boy crushes
*April 23, 2010*

**singular/plural**

i want to say this word in a plural way is this the correct way boy crushes or boys crushes
*April 23, 2010*

**math**

how do you find the area of a square
*April 22, 2010*

**Calculus**

If f(x)= 3 + |x-2|, then f'(2) is A. -1 B. 1 C. 2 D. 3 E. nonexistent
*April 19, 2010*

**math**

Mrs Munoz algebra class was collecting money for a party. The class decided that each student should give the same amount of money. They collected a total of $9.61. If everyone used 5 coins, how many nickels were collected?
*April 19, 2010*

**English**

Can you please tell me which of the two is better? a polka-dotted T-shirt or a polka-dot T-shirt?
*April 12, 2010*

**English**

I just want to know if I can send you my homework.
*April 12, 2010*

**math**

is this correct? 1.a jar contains 5 white, 15 violet,and 21 blue marbles. a marble is drawn at random. P(violet or white) answer: 5x15x21= 1575 15x5=75 75/1575= 1/21 2. a number from 10 to 16 is drawn at random. P(a number greater than 14) answer: 2/7
*April 8, 2010*

**math/probability**

find the number of possible choices when you choose one item from each category. 1. 3 hats, 7 shirts, 13 scarves 2. 6 pens, 2 nbk 3. 4 cars, 2 colors i dont get the question
*April 8, 2010*

**CHEMISTRY**

is it reasonable to expect the heat of neutralization to be the same regardless of which acid is used? or should we expect each acid and base combination to have its own heat of neutralization?
*April 8, 2010*

**Chemistry**

In the neutralization of HCl and NaOH i was instructed to measure the temperature of the acid HCl prior to mixing the reaction components. I was to assume however, that the NaOH solution was at this same temperature. Is this a reasonable assumption?
*April 7, 2010*

**biomechanics**

If a kicker produces a torque of 8Nm with her muscles and the resulting angular acceleration of her leg is 20rad/m2, what is the moment of inertia of her leg?
*April 6, 2010*

**Chemistry**

Well, I know that the reaction is endothermic, because delta Hº is also positive. I just don't understand why delta G is positive, since the reaction seems to be spontaneous...
*April 5, 2010*

**Chemistry**

If delta G for the dissociation of Borax at 30 degrees C (higher than room temperature) is positive, why does it dissolve at room temperature?
*April 5, 2010*

**health**

Help!! I am doing an assignment with 3 scenarios and I have got the first 2 but having trouble with the last. I have read through my chapter and searched webmd and other sites and still can't figure it out. Richard has noted over the past several weeks that he is having ...
*April 5, 2010*

**Math**

The slope intercept is 1/3 and the y intercept is 4xsquaredk. What is the slope intercept form.
*March 30, 2010*

**10th grade**

The slope intercept is 1/3 and the y intercept is 4xsquaredk. What is the slope intercept form.
*March 30, 2010*

**Trig Math**

I need help with this problem. I don't get how to do it or how they got that answer. A force of 50 pounds acts on an object at an angle of 45 degrees. A second force of 75 pounds acts on the object at an angle of -30 degrees. What was the direction and the magnitude of the...
*March 29, 2010*

**Physics**

The smallest object visible to the unaided eye is of 100 microns. If you use a microscope of m=1000, what is the size of the smallest object you can now see? (So=25cm) The answer is apparently 100nm. I am still confused as to why. Please help!
*March 26, 2010*

**world history**

why are farmers today not as tightly bound by geography and climate as they were in the past
*March 26, 2010*

**space**

uummm i want to know how can telescope cxan see so far????
*March 25, 2010*

**inorganic chemistry**

In the final step of making the nitro complex it involves the addtion of concentrated HCl. What are the role(s) of the HCl in this step of the synthesis? nitro complex: [Co(NH3)5(NO2)]Cl2
*March 22, 2010*

**Physics**

A mass spectrometer is used to separate isotopes. If the bean emerges with a speed of 374 km/s and the magnetic field in the mass selector is 1.5 T, what is the distance between the collectors for 235U+1 and 238U+1? The mass of 235U+1 is 235 u and the mass of 238U+1 is 238 u, ...
*March 21, 2010*

**physics**

Two horizontal parallel wires which carry currents I1 = 45 A (top)and I2 (bottom). The top wire is held in position, the bottom wire is prevented from moving sideways but can slide up and down without friction. If the wires have a mass of 9.2 g per metre of length, calculate ...
*March 21, 2010*

**Math**

What is 38 tmes 93 divided by 3 minus 4
*March 14, 2010*

**Physics**

Nevermind I figured it out thanks.
*March 13, 2010*

**Physics**

I am still confused as to which direction the wires will rotate. Using the right hand rule, I found that the magnetic field of both wires will rotate counterclockwise (if you look from above and from the left side).
*March 13, 2010*

**Physics**

Two current carrying wires cross at right angles (like a + sign). Wire 1 has current directed horizontally to the left. Wire 2 has current directed vertically up. If the wires are not restrained, what statement best describes the motion of the wires? A) Wire 1 moves out of the...
*March 13, 2010*

**algebra**

How do you solve the expotential notation equation 120-6^2/4x8?
*March 8, 2010*

**Physics**

We compare a silicon chip to a nerve membrane, with silicon having (about) twice the dielectric constant of the nerve membrane. Which of the following statements is true? A) 1cm^2 silicon chip has a higher capacitance than 1cm^2 nerve membrane. B) 1cm^2 silicon has the same ...
*February 28, 2010*

**PHYSICS**

The frequency of an ambulance siren is 700 Hz. If a pedestrian on the side of the road hears the siren at 756 Hz approximately how fast and in what direction is the ambulance moving? The answer is 90 km/h and towards the person..im not sure how to come to this answer though......
*February 22, 2010*