Sunday

February 19, 2017
Total # Posts: 29

**physical chemistry**

The system N2O4 <--->2NO2 maintained in a closed vessel at 60º C & a pressure of 5 atm has an average (i.e. observed) molecular weight of 69, calculate Kp. At what pressure at the same temperature would the observed molecular weight be (230/3)

*May 12, 2013*

**Chemistry**

see same question how many grams nitric acid HNO3 must be dissolved in 350 ml water to make a solution with pH of 4.5"? or "how many ml of a 4.2M nitric acid solution are required to make 500 ml of solution with pH of 2.9

*May 12, 2013*

**Chemistry**

just change the value i found it on y!A find the [H+} in pH of 4.5 , 10^-4.5 = [H+] = 3.16 e-5 molar find the moles acid in 350 ml 0.350 litres @ 3.16 e-5 mol/litre = 1.11 e-5 moles of HNO3 find the grams using molar mass: 1.11 e-5 moles of HNO3 @ 63 g/mol = 0.00070 grams of ...

*May 12, 2013*

**Chemistry**

plz answer mine The system N2O4 <--->2NO2 maintained in a closed vessel at 60º C & a pressure of 5 atm has an average (i.e. observed) molecular weight of 69, calculate Kp. At what pressure at the same temperature would the observed molecular weight be (230/3)

*May 12, 2013*

**Chemistry**

The system N2O4 <--->2NO2 maintained in a closed vessel at 60º C & a pressure of 5 atm has an average (i.e. observed) molecular weight of 69, calculate Kp. At what pressure at the same temperature would the observed molecular weight be (230/3)

*May 12, 2013*

**math 3rd grade**

4 x 7 = 28 Double of 4 is 8, so we will double 28 (4x2) x 7 = (28x28) or (4+4) x 7 = (28+28) answer 56)

*November 26, 2012*

**^th grade math,**

25(12) 25 (10+2) 250 + 50 (25x10+25x2) 300

*November 15, 2012*

**physics**

A 50 ohm lamp and a 10 ohm electric iron are connected in series to a generator delivering 120 V. The current through the lamp and the iron is ___ The voltage ccross the lamp is ___ The voltage drop acrowss the iron is ___ How do I set these up? Thank you.

*May 18, 2011*

**physics**

how would you measure the resistance of an electrical device, such as a lamp, by the voltmeter-ammeter method?

*May 17, 2011*

**physics please help**

What is the resistance of 125 m of aluminum wire that has a diameter of 0.8118 mm? The resistivity of aluminum is 2.824 x 10^-8 (omega) m. I need help with the set up. we've been using R = V/I, but haven't had anything with resistivity. I don't know where to place ...

*April 28, 2011*

**physics**

I have 2 fill in the blanks that I need help with. 1) When electrons are forced away from a/an ___ plate, work is done. could the answer be positive? 2) Any pointed or angular surface of an object must have a/an ___ concentration of charge to establish equilibrium. I do not ...

*April 10, 2011*

**physics**

if a negatively charged rod is brought near a negatively charged electroscope, there will be no effect the leaves will fall the leaves will spread farther apart the electroscopw will become positively charge

*March 28, 2011*

**math - trig**

Given the coordinates of the terminal side of an angle in standard position, find the value of sine, cosine, and tangent: (-4,0)

*March 21, 2011*

**physics**

A 680 newton student runs up a flight of stairs 3.5 m high in 11.4 seconds. The student takese 8.5 seconds to run up the same flight of stairs during a second trial. 1)Find the work done by the 680 N student in climbing the stairs 2) Determine the power developed by the ...

*March 20, 2011*

**physics**

work is being done when a force: a) is exerted while pulling a wagon up a hill b) acts vertically on a cart that can only move horizontally c) is exerted by one team in a tug-of-war when there is no movement d) of gravitational attraction acts on a person standing on the ...

*March 17, 2011*

**physics**

So my slope doesn't have to be so exact to the k value? When I use the equation to predict the stretch, I get a value of .085 using the first two points and a value of .089 when using the first and last points. The given data table lists the actual stretch at 0.085. So in ...

*March 17, 2011*

**physics**

I'm making a graph of force vs stretch for springs. I have 7 data trials with the k (F = kx) ranging from 28 to 31, average is 29.6. Now I need to find the slope and write an equation for the graph. If I use the first two points to get the slope, I get a slope of 29.4. If ...

*March 17, 2011*

**physics**

in a making a graph showing the stretch of a spring: Plot a graph of force vs. stretch. Find the slope. The Slope of the graph is called the spring constant. 1)What does the slope of the graph tell you? 2) If someone had a graph with a slope twice as steep as yours, but you ...

*March 16, 2011*

**physics**

1)The increase in potential energy of any system is equal to the output ___. I still have no idea. 2) The path that an object follows as it is raised does not affect the ___ of the object. Could it possibly be "final kinetic energy"?

*March 6, 2011*

**physics - energy**

1) What are the 3 basic forms of energy? Since there are so many, I'm thinking of kinetic and potential, but what would be the third? 2)The increase in potential energy of any system is equal to the output ___.

*March 5, 2011*

**physics**

2 questions to fill in the blank: 1) in order tocalculate work done, use the ___ of the force which is in the direction of motion. 2) You push against a car stuck in the mud. You will do ___ work unless you are successful in moving the car.

*February 20, 2011*

**physics**

2 questions to fill in the blank: 1) in order tocalculate work done, use the ___ of the force which is in the direction of motion. 2) You push against a car stuck in the mud. You will do ___ work unless you are successful in moving the car.

*February 20, 2011*

**physics**

2 questions to fill in the blank: 1) in order tocalculate work done, use the ___ of the force which is in the direction of motion. 2) You push against a car stuck in the mud. You will do ___ work unless you are successful in moving the car.

*February 19, 2011*

**physics**

a 1500 kg car moving with a speed of 15 m/s collides with a utility pole and is brought to rest in 0.3 s. Find the average force exerted on the car during the collision.

*February 7, 2011*

**physics**

on a force-time graph: rectangle is shaded in from 2 to 8 on the x axis. It is shaded from 0 to 8 on the y axis. (so the base is 2 to 8 and the height is 0 to 8) The graph is for a force acting on a 12.0 kg cart initially at rest on a frictionless surface. What is the final ...

*February 3, 2011*

**physics**

Its an ABC question. the satellite has a constant a. momentum b. velocity c. acceleration so now which do i pick?

*January 25, 2011*

**physics**

When a satellite moves in a circular orbit around a planet, does it have constant momentum, velocity or acceleration?

*January 25, 2011*

**health**

what is sex determination?

*January 19, 2011*

**calculus**

a particle moves along the y axis so that its position at any time t, for 0 is less than or equal to t which is less than or equal to 5, is given by y(t)=t^4-18t^2. in which intervals is the particle speeding up?

*January 18, 2011*

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