Saturday
December 20, 2014

Posts by Robert


Total # Posts: 852

Chemistry
so I found out I need to extrapolate the temperature, but how do I do that, if I only have a graph and no other information
May 30, 2012

Chemistry
Plus, would that be the temperature I use in my calculations of Heat, or do I take the initial temperature of my column and the final one? I doubt it's this though
May 30, 2012

Chemistry
I had a lab about calorimetry where we would have a temperature probe in a calorimeter cup and then pour hot water into it to form a mixture until our graph (automatically plotted from the data that's recorded by the computer). Now for the report they ask us to draw a ...
May 30, 2012

Chemistry
I see, thanks a lot Bob!
May 29, 2012

Chemistry
Derive a formula for the molar mass of the solute in terms of the freezing point depression, deltaT, the freezing-point constant, Kf, and the masses of solvent, msolvent, and solute, msolute, used in an experiment like this one. SHow your work and include all unites in your ...
May 29, 2012

Chemistry
I get it now, thanks again Bob
May 23, 2012

Chemistry
Thanks Bob! As for deltaS, it just says Entropy increases in all spontaneous reactions, there's nothing more specified, so I assumed that it was deltaS and not deltaSuniverse
May 23, 2012

Chemistry
(b) deltaG < 0 , are product-favored and occur with rapid transformation of reactants to products. HOw is this incorrect? deltaG < 0 is product-favored and is rxn forward. Thank you
May 23, 2012

Chemistry
So when there's a spontaneous reaction, deltaS is > 0 , I confused that with increase. I still don't see how it's incorrect
May 23, 2012

Chemistry
Explain why each of the following is incorrect: (a) Entropy increases in all spontaneous reactions. Wouldn't (a) be actually correct? Because when there's a spontaneous reaction, you have less stable molecules and more disorder. It will be lower in some reactions than ...
May 23, 2012

GEOMETRY
Given that AB is a tangent of the circle with the center at X, AB = 12, and XD = 2.5, which is the length of DB?
May 23, 2012

physics
In one room the radiator has a dark color (emissitivity = 0.818). It has a temperature of 64.8 oC. The new owner of the house paints the radiator a lighter color (emissitivity = 0.417). Assuming that it emits the same radiant power as it did before being painted, what is the ...
May 21, 2012

physics
A cubical piece of heat-shield-tile from the space shuttle measures 0.18 m on a side and has a thermal conductivity of 0.065 J/(s·m·C°). The outer surface of the tile is heated to a temperature of 1050°C, while the inner surface is maintained at a ...
May 21, 2012

E&M Physics
this is the image ww w.ux1.eiu.edu/~cfadd/1360/24Gauss/24Hmwk/24.05. html
May 18, 2012

E&M Physics
Hello, I have this number where I don't understand why there's a negative sign to it. Consider a closed triangular box resting withing a horizontal electric field of magnitude E = 7.8 x 104 N/C as shown here. Calculate the electric flux through (a) the vertical surface...
May 18, 2012

Chemistry
I got it, oxidation state of reactants is going to be (+5) and products (-4) so it's an oxidation reaction, thanks for the info Bob!
May 16, 2012

Chemistry
so the oxygen molecule detachs from the Hydroxide and moves to electronegative species right?
May 16, 2012

Chemistry
Hello, I had a lab about calorimetry and one of the questions was if the reaction of acetone with hypochlorite is an oxidation/reduction or acid/base. Would the answer be: oxidation/reduction because the oxygen from the hydroxide from the Sodium hydroxide detaches and joins ...
May 16, 2012

Ashford
Employee motivation
May 10, 2012

Chemistry
thanks!
May 9, 2012

Chemistry
3) You pour 240 mL of Coke into a glass, where the T of the beverage is at 10.5 *C. You then add one ice cube of 45g. Determine the final temperature and the amount of ice remaining, if any. So I know that there won't be any more ice left because they will reach thermal ...
May 9, 2012

physics
A steel (Young's modulus 2.0 x 1011 N/m2) wire is strung between two supports attached to a ceiling. Initially, there is no tension in the wire when it is horizontal. A 88-N picture is then hung from the center of the wire, as the drawing illustrates, so the ends of the ...
April 14, 2012

Chemistry please help
How would an HA acid behave in water if it were a strong acid, weak acid, and non-electrolyte?
March 31, 2012

Chemistry Help Please
i do not understand how to solve this problem, please help 10.0mL 0.5M sulfuric acid can neutralize what volume of 0.5M ammonium hydroxide?
March 31, 2012

calculus
find the total differential of the function f(x,y)= xye^(x+y)
March 30, 2012

calculus
find the total differential of the function. f(x,y) = 5y/x-y
March 30, 2012

statistics
A Packaging Company sells soda and claims each can contains 12 oz. A random sample of 15 sodas yielded a sample mean of 11.2 oz. Given the sample standard deviation is 0.3 oz, estimate the margin of error for a 90% confidence interval.
March 29, 2012

statistics
A poll claims that 70% of the population is for a new amendment. A random sample of 49 people showed that 27 voted in favor of the new amendment. Give a 95% confidence interval. Give lower limit and upper limit accurate to four decimal places
March 29, 2012

math
If Pete colored 1/2 of a poster and Rebecca colored 1/3 of the poster. What fraction still needs to be colored?
March 29, 2012

Economics
C
March 20, 2012

English 11
please help 1 is right.
March 12, 2012

English 11
1. Olaudah Equiano wrote (1 point) a book of letters to his African family. a history of the West Indian slave trade. stories of early slavery in Virginia. the first autobiography by a black man in America. 2. The term “the Middle Passage” refers to (1 point) the ...
March 12, 2012

Maths
Mr Jones takes 4 hours to paint a fence. Mark his son takes 6 hours to paint the same fence. How long does it take for them both to paint the fence?
March 7, 2012

math
33inches
March 7, 2012

english
Type a short character sketch of a fictional Puritan named Justice Johnson based on what you have learned about the Puritans Make certain that you describe how he dresses how he lives what he believe?
February 16, 2012

math
You are taking your friend to lunch and have exactly 15 dollars to spend. You want to leave a 15% tip. What is the maximum amount of money you could spend?
February 7, 2012

College Math
m=4
January 28, 2012

Physics
An electric current of 50 +/- 1 mA flows through an electric bulb filament that has a resistance of 10 +/- 2 ohm. Estimate the power dissipated by the filament and the associated error in the power.
January 26, 2012

physics
A uniform electric field ofmagnitude 384 V/m is directed in the positive x-direction. Suppose a 16 ìC charge moves from the origin to point A at the coordinates, (20 cm, 60 cm). What is the absolute value of the change in potential from the origin to point A? Answer in ...
January 23, 2012

Physics
A speedboat starts from rest and accelerates at +1.98 m/s2 for 8.25 s. At the end of this time, the boat continues for an additional 5.58 s with an acceleration of +0.348 m/s2. Following this, the boat accelerates at -1.42 m/s2 for 7.22 s. (a) What is the velocity of the boat ...
January 22, 2012

math
3x^3/(3x)^3
January 12, 2012

ALGEBRA 2
T=I divided by PR
January 12, 2012

Algebra 1
(2p/9)exponent of 3
January 12, 2012

English
Sorry, but my brothers typed some questions also so they used their name.
January 9, 2012

English
1) The following passage is an example of which literary element? "Give back your heart to itself, to the stranger who has loved you all your life, whom you ignored for another, who knows you by heart." a)paradox b)magical realism c)metaphor d)hyperbole* 2)In the ...
January 9, 2012

English
Can someone please check my answers?
January 9, 2012

statistics
If there were 10 distribution centers that have an output mean of 78 (in thousands), median of 65 and mode of 50, what would be the total output of the distribution centers?
January 4, 2012

statistics
If there were 10 distribution centers that have an output mean of 78 (in thousands), median of 65 and mode of 50, what would be the total output of the distribution centers?
January 4, 2012

Physics
A 0.350-kg ball is dropped from rest at a point 1.10 m above the floor. The ball rebounds straight upward to a height of 0.420 m. Taking the negative direction to be downward, what is the impulse of the net force applied to the ball during the collision with the floor?
January 3, 2012

physics
A 3.4-kg box is released on a horizontal surface with an initial speed of 4.8 m/s. It moves on the surface with a deceleration of 0.45 m/s2. Calculate the kinetic friction force on the box.
January 3, 2012

ALgebra
Indicate and explain the logical error in the following set of algebraic expressions Let a=b square both sides to get a^2=b^2 a^2=b*b Since a=b, then a^2=a*b Subtract b^2 from both sides a^2-b^2=a*b-b^2 Factor both sides: (a+b)(a-b)=b(a-b) Divide both sides by (a-b) (a+b)=b ...
December 22, 2011

Physics
A box is being pushed up the ramp by you at a 15 degree angle. The coefficient of kinetic friction between the box and ramp is .4. The box has a mass of 12 kg and you are pushing up the ramp with a force of 95N. What is the kinetic frictional force? What is the sum of forces (...
December 7, 2011

english 9
which paragraph of the article best supports the authors argument against clear cutting?
December 7, 2011

World geography
This very southern city in Africa is in an area of moderate rainfall
December 6, 2011

English Comp. I
Exercise 32.4 Please help with this assignment. I'm having trouble with it. Rive to clarify pronoun reference. Most can be revised in many ways. If a pronoun refers ambiguously to more than one possible antecedent, revise the sentence to reflect each possible meaning. 1. ...
December 5, 2011

English Comp. I
Exercise 32.4 Please help with this assignment. I'm having trouble with it. Rive to clarify pronoun reference. Most can be revised in many ways. If a pronoun refers ambiguously to more than one possible antecedent, revise the sentence to reflect each possible meaning. 1. ...
December 5, 2011

precalculus
Simplify the Factorial Expression. (3n+1)!*3!/(3n-2)!
December 5, 2011

precalc
Write the partial fraction decomposition of the rational expression. 6x^2+1/x^2(x-1)^2
December 4, 2011

precalc/trig
Write the partial fraction decomposition of the rational expression. 4x^2–19x+31/ (x+2)(x^2–4x+5)
December 3, 2011

chemistry
How much energy is required to heat 120.0g of water from 2.0°c to 24.0°c (Cp of H2O=4.184J/g
December 1, 2011

Calculus
If f(x) and g(x) are differentiable and lim(x->a) f(x)/g(x) exists, does it follow that lim(x->a) f '(x)/g'(x) exists (a converse to l'Hopital's Rule)?
November 27, 2011

Mathematic
. The number of vibrations per second made when a stretched wire is plucked varies directly as the square root of the tension in the wire and inversely as the length. If a 1.23 m long wire will vibrate 325 times each second when the tension is 115 N, determine the number of ...
November 22, 2011

math
f(x)=-8xlnx decreases over what domain
November 21, 2011

calculus
dang it. well the diagram was what my teacher gave me to go by. the 81 is the diagonals on both sides, or thats the way its written on the sheet of paper. and 8 is the length of the base.
November 17, 2011

calculus
a trapezoid is a quadrilateral with (only) two sides (called bases) that are parallel. an isosceles trapezoid has two equal legs. the area of a trapezoid is A=(1/2)*h*(b1+b2) where b1 and b2 are the two parallel bases and h is the altitude. your problem: a water viaduct has a ...
November 17, 2011

calculus
a fence 8 ft tall stands on level ground and runs parallel to a tall building. if the fence is 1 ft from the building, find the length of the shortest ladder that will extend from the ground over the fence to the wall of the building. (hint #1: if L represents the length of ...
November 17, 2011

calculus
a farmer has a 2040 ft of fencing and wishes to fence off two separate fields. one of the fields is to be a rectangle with the length twise as long os the width. while the other field is to be square. determine the dimension of the fields if the farmer wishes to maximize the ...
November 17, 2011

phyics
A novice golfer on the green takes three strokes to sink the ball. The successive dis- placements are 5.9 m to the north, 10 m 45  north of east, and 5.9 m 26 west of south. Starting at the same initial point, an expert (lucky) golfer could make the hole in a single ...
November 17, 2011

algebra
Re-write with a rational exponent and simplify. ^3 sqrt:22
November 9, 2011

algebra
Find the varition constant and an equation where y varies directly as x=16 where x=8
November 8, 2011

math
find an equation of the tangent line to the curve at the given point: y=sqrt(1+x^3), (2,3)
November 1, 2011

Chemistry
Our class did an expeiment of adding sodium carbonate and calcium chloride. The experiment only yielded 28% of the calculated yield. The class did the experiment as a group (there are only 4 students in our class) and the experiment was closely supervised by our teacher to ...
October 26, 2011

Chem
64----> 32---> 16----->8 1 2 3 There are 3 half life. Divide 42/3 = 14 days
October 19, 2011

Algebra
yo momma
October 13, 2011

physics
A dog with a mass of 15kg jumps forward at 0.50m/s to catch a frisbee coming in the opposite direction at 5m/s. the dog catches the frisbee in its mouth and in doing so its velocity drops to 0.45m/s. What was the mass of the frisbee?
October 12, 2011

Math Help
yes it is, as: w^2-13w+42=0 (w-7)(w-6)=0
October 12, 2011

math
what is 33% of 61
October 4, 2011

math
5 items = a mean of 98 6 items =mean of 102 possible anwers 25,24,117,122 please show how to do
September 29, 2011

accounting
Ayres Services acquired an asset for $80 million in 2011. The asset is depreciated for financial reporting purposes over four years on a straight-line basis (no residual value). For tax purposes the asset's cost is depreciated by MACRS. The enacted tax rate is 40%. Amounts...
September 28, 2011

chemistry 1025
a shoe box measures 12.0 inches by 5.5 inches by 3.5 inches. calculate its volume in cubic centimeters.
September 27, 2011

physics
Carol is correct. I just had this problem on my online test.
September 24, 2011

math
If Jill climbed 100 feet more, how many feet above sea level would she be?
September 9, 2011

Math
10 ways to make .50 only using quarters, nickles and dimes?
August 30, 2011

Math
0.810g/mL-1.375g/mL-2.046g/mL are these numbers precise or accurate or both?
August 30, 2011

Math
3. A processor makes two components, A and B, which are then packaged together as the final product (each product sold contains one A and one B). The processor can do only one component at a time: either it can make As or it can make Bs. There is a setup time when switching ...
August 28, 2011

geometry
4x + 7 = 5x - 4
August 25, 2011

Psychology
compare and contrast the strengths and weaknesses of two different approaches to study the following issue: You have developed a new drug that you believe is effective in reducing appetite. As a result of some preliminary research, you have been given a small grant to design ...
August 14, 2011

ALGEBRA
what does the F and g mean at the beginning of any function
August 11, 2011

algebra
g(x)=10/x+7 what this things domain
August 11, 2011

Math
The formula h=48t-16t^2 gives the height, h, in feet, of an object projected into the air after t seconds. If an object is propelled upward, at what time(s) will it reach a height of 32 feet above the ground?
July 27, 2011

Business
What types of technology do people utilize to communicate? How does technology change the way people communicate? What does technology bring to communication other than the technology itself?
July 27, 2011

Business Communication
The way business communication is conducted [Passive voice] in the workplace experiences regular changes with the advances in technology that makes communication faster and easier.
July 26, 2011

calculus
this is a optimization problem A construction company has been offered a contract for $7.8 million to construct and operate a trucking route for five years to transport ore from a mine site to a smelter. The smelter is located on a major highway, and the mine is 3 km into a ...
July 25, 2011

Chemistry
Ethanol, C2H5OH or C2H6O, is mixed with gasoline and sold as gasohol. Given the following thermo-chemical reaction, calculate the kilograms (kg) of CO2 produced when enough ethanol is combusted to provide (or give off) 369 kJ of heat: C2H5OH (l) + 3 O2 (g) --> 2 CO2 (g) +3 ...
July 12, 2011

physics
Suppose 2 balls of same mass are held by 4 ropes, 2 for each ball. One ball is held by 2 ropes fastened at same height to something and the other at different heights. If the angles made by each respective pair of ropes(eg. right to right) are equal, are tensions in each ...
June 27, 2011

Math
Solve: sin2xsinx - cos2xcosx = 1, x domain [-pi, pi].
June 16, 2011

geometry
Find side c if side a = 10 inches and side b = 6 inches.
June 15, 2011

Math
If Brad invests $2700 in an account paying 11% compounded quarterly. How much is in the account after 6 months?
June 14, 2011

math
1/3x+5(12-x)=2x what would "x" equal? how did you solve it?
June 7, 2011

math
1/3x+5(12-x)=2x
June 7, 2011

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