Wednesday
July 1, 2015

Posts by joseph


Total # Posts: 441

stats
A statistics practitioner wishes to test the following hypothesis: H0 : ì = 600 against H1 : ì < 600 A sample of 50 observations yielded the statistics: mean x = 585 and standard deviation sx = 45. The test statistic of a test to determine whether there is ...
March 31, 2010

3rd grade
ciopanam
March 23, 2010

calculus
D) would actually be approximately 9.23 seconds. 1362/16=85.125
March 21, 2010

Math209
Selling shirts. If a vendor charges p dollars each forrugby shirts, then he expects to sell 2000 - 100p shirts ata tournament. a) Find a polynomial R(p) that represents the total revenuewhen the shirts are p dollars each. b) Find R(5), R(10), and R(20). c) Use a bar graph to ...
March 13, 2010

maths
The plane is flying at an altitude of 8 miles and is 175 miles from the runway, as measured from the ground. What angle will the plane's path make with the runway? Round your answer to the nearest hundredth.
March 12, 2010

Physics
Hi, I have the following question: 1. The index of refraction for a prism is given by the equation: n = 1.58 − (6.41 x 10^4)λ where λ is the wavelength in meters. Light is incident at 28°. Find the exit angle ß for light of a) 800 nm b) 633 nm c) 540 ...
March 7, 2010

accounting
What is the Journal Entry for: Sold goods to Smithsons for $700 that costs $300. Terms of n/30 were offered. As a courtesy to Smithsons, $125 of frieght was added to the invoice for which cash was paid directly to the UPS by Opals, INC? Need This answer ASAP!
February 27, 2010

Physics
The typical resistance of the tungsten filament of a 60 watt incandescent light bulb when it is turned off is 24 ohms and its resistance when operating from a 120 volt power source is 240 ohms. Generally, an incandescent light bulb filament is most likely to “burn out&#...
February 23, 2010

Math 116 algebra
plug in the x values in the equation to find the y values.
February 23, 2010

Physics
No, this is all of the information that is provided.
February 23, 2010

Physics
The nominal resistance R of the resistor used in this experiment was printed on the resistor by the manufacturer. According to the manufacturer, the actual resistance of the resistor should not differ from its nominal value by more than 1%. Does your most accurate measured ...
February 23, 2010

Physics
This is the question that was provided, no more information.
February 23, 2010

math
use a calculator!
February 23, 2010

chem
Benzaldehyde, C6H5CHO}, has a normal boiling point of 179.0 C and a critical point at 422 C and 45.9 atm. Using a phase diagram, estimate its vapor pressure at 125 Degrees (I'm putting this back up again. Since I still didn't understand it but the answer to it was 171 ...
February 15, 2010

chem
Heat of vap. is 38.9 KJ/mol
February 15, 2010

chem
How much heat is required to raise the temperature of 200 g CH3OH from 20 to 30 degrees and then vaporize it at 30 degrees. The molar heat capacity of CH3OH is 81.1 J/Mol/K. Okay...the answer is approximately around 254. It was a homework problem. The question is how do you ...
February 15, 2010

Chemistry
thank you very much. my chemistry is very rusty so i need a refresher.
February 15, 2010

Chemistry
1.) A vapor volume of 1.17 L forms when a sample of liquid CH3CN absorbs 1.00 KJ of heat at its normal boiling point (81.1 C and 1 atm). What is the heat of vaporization in KJ per moles of CH3CN? 2.) The vapor pressure of water at 25 C is 23.76 torr. If a 1.25 g sample of H20 ...
February 15, 2010

chemistry
How much heat is required to raise the temperature of 200 g CH3OH from 20 to 30 degrees and then vaporize it at 30 degrees. The molar heat capacity of CH3OH is 81.1 J/Mol/K. Okay...the answer is approximately around 254. It was a homework problem. The question is how do you ...
February 13, 2010

chemistry
Btw what do I do about the molar heat capacity
February 13, 2010

chemistry
hm...I dont remember posting this problem but thank you again dr.bob, I can definetly always count on you
February 13, 2010

chemistry
How much heat is required to raise the temperature of 200 g CH3OH from 20 to 30 degrees and then vaporize it at 30 degrees. The molar heat capacity of CH3OH is 81.1 J/Mol/K. Okay...the answer is approximately around 254. It was a homework problem. The question is how do you ...
February 13, 2010

chem
The normal melting point of copper is 1357 K and heat of fusion of Cu is 13.05 KJ. How much heat, in kilojoules, is evolved when a 3.70 kg sample of of molten Cu freezes?
February 11, 2010

Chem.
nevermind i had it right the whole time. thank you
February 10, 2010

Chem.
Benzene has a heat of vaporization of 30.72 kj/mol and a normal boiling point of 80.1 degrees celcius. At what temperature does Benzene boil when the external pressure is 440 torr? Since...I didn't get the right answer. I'll just show my work and see if anyone can help...
February 10, 2010

Chem.
nevermind. i got it. thank you dr. bob for showing me how to do it tho
February 10, 2010

Chem.
I solved it and got 42.94 torr, so by 2 sig figs i rounded it up to 43 torr. What did you get?
February 10, 2010

Chem.
Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius?? Okay...I dont really get out to solve for it actually. ln (P2/760 torr)= -38560/8.3145 * (1/291.15 - 1/351.15...
February 10, 2010

Chem.
Benzene has a heat of vaporization of 30.72 kj/mol and a normal boiling point of 80.1 degrees celcius. At what temperature does Benzene boil when the external pressure is 440 torr?
February 10, 2010

Chem.
Thanks. But I'm still getting it wrong, cause maybe the sig figs are off by a little. What did you get for this problem?
February 10, 2010

Chem.
Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius??
February 10, 2010

Computer Science
Haha yeah thanks i already figured it out. thank you tho
February 8, 2010

Computer Science
I tried the / but that didnt worked either =[
February 8, 2010

Computer Science
This is the problem: The following HTML code fragment contains a reference to an image file called frog.gif and with alternate text set to froggy, but the code as written contains a number of errors. Write the HTML line correctly. <IMG SCR=frog.gif ALT=froggy> (Note: ...
February 8, 2010

Literary Analysis and Composition
Are you sure this is a solid b+
January 21, 2010

math
pentagon
January 20, 2010

math
what do you call a closed figure made up of line segments?
January 20, 2010

childcare
ANSWER 11-13
December 16, 2009

math
Sandra has eight coins witch total $0.87. what coins does she have (Hint:make a chart or a list)
December 3, 2009

8th grade
how do i find antony for words in my weglish class.
November 2, 2009

math
write each decimal as a percent and as a fraction in the lowest terms
October 27, 2009

History
Federalist
October 27, 2009

gOVERNMENT
marbury vs madison mcculloch vs Maryland dred scott decision plessy vs ferguson brown vs board of education roe vs wade bowers vs hardwick mapp vs ohio bakke decisioN What amendments are these linked to and rights related to.
October 17, 2009

Science
how to find length volume and mass
October 11, 2009

sports puzzle
I have puzzle to solve on words from the world of sports.Do you know any web or side that can help .
September 10, 2009

algebra
What is the set of numbers belonging to an absolute number
August 27, 2009

Finance
Write a 200- to 300-word description of the four time value of money concepts: present value, present value of an annuity, future value, and future value of annuity. Describe the characteristics of each concept and give an example of when each would be used
August 13, 2009

biology
What is the outer edge of a cheek cell called? please urgent homework due tommorow
August 8, 2009

Literature (short story)
11. Twain's account of Colonel Rall's speech ("full of gunpowder and glory") is contrasted most vividly to the Marion Ranger's collective remorse over A. the strange affair at "Camp Desolation." B. the shooting of an unarmed rider. C. rebuffing ...
June 19, 2009

math
1) A gardener wants to plant flowers 10 feet form the base of a flag pole. When he has completed the task, describe in detail what geometric shape the planted flowers will form? 2) Describe the locus of points 5 units from the line whose equation is y=3 on a coordinate graph. ...
April 23, 2009

reading
milkweed jerry spinelli what dop you think the fox-face furs with beady black eyes symbolize?
March 26, 2009

reding
milkweed jerry spinelli what do you think the black horse on the merry-go-round might have symbolized?
March 26, 2009

reading
jerry spinelli milkweed what is the dramatic irony in the scene when misha accompanies janina`s family on their way to the ghetto? what is the effect of this device?
March 26, 2009

chemistry
CH=78g/mol but the relative atomic mass of C=12 and H=1 therefore the molecular mass would be (12+1)n=78 g/mol 13n = 78 g/mol n=6 the molecular formula is C6H6 .
March 24, 2009

algebra
Under what situation would one or more solutions of a rational equation be unacceptable? Give an example.
March 19, 2009

grammar
fourthly,he went fishing with his pal. correct grammer.
March 15, 2009

College Level Probability
4 and5
February 23, 2009

english 10
is that he answer
February 22, 2009

english 10
create five figures of speech by comparing one word in column A with column B A B wind mountain athlete stare forest blast best ernerald paper hum
February 22, 2009

Math
Joe and Anna collect football cards.The greatest common factor of the numbers of cards in their collections is 15.Altogether Joe and Anna have 75 cards.If Joe has more cards than Anna,how many cards do they each have?
February 19, 2009

3rd grade
Thanks
February 19, 2009

3rd grade
identify fraction relationships 5/10 of 20=
February 19, 2009

Math
identify fraction relationship of 5/10 of 20=
February 19, 2009

Chemistry/Science
Can you check my answers thanks. Directions: State which statements are true and false. 1. Carbon atoms can bond together in straight chains, branched chains, or rings. Answer: True 2. Isomers are compounds with the same simple formula but different three dimensional ...
February 3, 2009

Poem: A Voice by Pat Mora
Do you want to poop or fart???
January 26, 2009

American History
Who was the man who championed the conquered province view of the South in the Reconstruction period abd wanted to give each freedman "40 acres and a mule" to them economic viability?
December 1, 2008

math
the perimeter of a rectangle is 24 inches. find teh dimensions if the length is 3 inches greater than its width
November 11, 2008

soical studies
what are pennsylvania 5 natural regions?
November 8, 2008

government
Why are they majority and minority whips important?
October 28, 2008

Pre Calculus
how do you find additional points on a line with a slope of 1/2 and a given point of (7,-2)?
September 7, 2008

pre Calculus
how do you find additional points on a line with a slope of 1/2 and a given point of (7,-2)? im sorry but i still cant get an answer for this question.
September 7, 2008

Pre Calculus
thanks now i get it
September 7, 2008

Pre Calculus
please help me with this problem? I don't know how ro do it. please show me step by step. Write the slope intercept form the equations of the lines through the given point parallel to the given line and (B) perpendicular to given line. point slope ((7,-2) m= 1/2
September 7, 2008

Pre Calculus
i still don't get how to do it
September 7, 2008

Pre Calculus
please help me with this problem? I have the answer but I need to know how to do it. Write the slope intercept form the equations of the lines through the given point parallel to the given line and (B) perpendicular to given line. point slope ((7,-2) m= 1/2
September 7, 2008

PrecCalculus
please help me with this problem? I have the answer but I need to know how to do it. Use the point on the line and the slope of the line to find three additional points through which the line passes point slope ((7,-2) m= 1/2
September 7, 2008

precalc: elimating the parameter
THANK YOU. i just really needed that bit of a start; now i can finish the rest. thanks again!
July 9, 2008

precalc: elimating the parameter
hi, i'm having trouble understanding the concept of eliminating the parameter to obtain an equation in x and y alone. can anyone please solve this problem and explain it? thank you so much. x = 3T-4 y= = 1-2T (0<t<3) those signs are actually less than or equal to.
July 9, 2008

chemistry
For the reactions that occurred spontaneously in the individual tables, balance these reactions assuming they are in an acidic solution. Reaction 1: Cu I^- Ag Br^- Reaction 2: Zn Pb Cu Ag Reaction 3: Cl2 Br2 I2 Reaction 1 I 2(aq) Cu2 + (aq) Ag + (aq) Br2 (aq) Reaction 2 Ag + (...
April 15, 2008

chemistry
"However, the Ag^+ + I^- reacted to give AgI (but that is not a redox reaction) and if they reacted why didn't Br^- and Ag^+?" Hi Dr.Bob, I am also given additional information for reaction #1 Cu(s) I-(aq) Ag(s) Br- (aq)
April 15, 2008

chemistry
Reaction 1 I 2(aq) Cu2 + (aq) Ag + (aq) Br2 (aq) Reaction 2 Ag + (aq) Pb2 + (aq) Cu2 + (aq) Zn2 +(aq) Reaction 3 Br - (aq) Cl - (aq) I - (aq)
April 14, 2008

chemistry
ONe more question DrBob :) For the reactions that occurred spontaneously in the individual tables, balance these reactions assuming they are in an acidic solution. Thanks for any further assistance we appreciate it
April 14, 2008

chemistry
Of the reactions that occurred spontaneously in the individual tables, what types of qualitative changes would you observe that would indicate the reaction is proceeding?
April 14, 2008

chemistry
Reaction 1: I2(aq)Cu^+2(aq) Ag^+(aq)Br2(aq) Column 1---Column 2---Column 3---Column 4---Column 5 I-(aq)---X---X---T---T Cu(s)---T---X---T---T Ag(s)---X---X---X---T Br-(aq)---X---X---X---X Reaction of metals and solution of ions Reaction 2: Ag+(aq)Pb2+(aq)Cu2+(aq)Zn2+(aq) ...
April 14, 2008

chemistry
I found a pattern and I was wondering if it applies to all reactions. The more times there is evidence of a redox reaction occuring for an element, the higher this element will be on the list?
April 14, 2008

chemistry
I found a pattern and I was wondering if it applies to all reactions. The more times there is evidence of a redox reaction occuring for an element, the higher this element will be on the list?
April 14, 2008

chemistry
"Ag(s) reacts with none of the 4 (solutions of Ag^+2, Pb^+2, Cu^+2, Zn^+2}. So Ag(s) goes at the bottom of the table for now although there may be some metals below silver when you finish with the entire table. Cu(s) reacts with (Ag^+ solution) so Cu goes above Ag ion. It...
April 14, 2008

chemistry
When I finish with the other two reactions, would you mind reviewing my work?
April 13, 2008

chemistry
*Forgot to add, reaciton 3 is Br-(aq) Cl-(aq) I-(aq)
April 13, 2008

chemistry
Purpose: The purpose of this lab excersise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this excersise, you will see how extensive tables of relative strengths of oxidizing and reducing agents have been developed. Procedure: ...
April 13, 2008

chemistry
No problem, I will write it as you say:)
April 13, 2008

chemistry
Hi I sent this question a few days ago but did not get it answered I think it may have been mixed up in the jumble. Purpose: The purpose of this lab exercise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this exercise, you will ...
April 13, 2008

chemistry
Hi I sent this question a few days ago but did not get it answered I think it may have been mixed up in the jumble. Purpose: The purpose of this lab exercise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this exercise, you will ...
April 13, 2008

chemistry
Purpose: The purpose of this lab exercise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this exercise, you will see how more extensive tables of relative strengths of oxidizing and reducing agents have been developed. Procedure: ...
April 12, 2008

chemistry
*Please note For table 1 I2(aq), Cu2+(aq), Ag+(aq) and Br2(aq) are supposed to be shifted to the right since they are horizontal. I-(aq), Cu(s), Ag(s) and Br-(aq) are vertical. For table 2 Ag+(aq), Pb2+(aq), Cu2+(aq) and Zn2+(aq) are supposed to be shifted to the right since ...
April 11, 2008

chemistry
Purpose: The purpose of this lab exercise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this exercise, you will see how more extensive tables of relative strengths of oxidizing and reducing agents have been developed. Procedure: ...
April 11, 2008

chemistry
Sorry.... the tables not supposed to turn out liek that. Can anyone show me how the table can be improved? Table 1: 4 vertical columns, 4 horizontal columns (on top) Table 2: 4 vertical columns, 4 horizontal columns (on top) Table 3: 3 vertical columns, 3 horizontal columns (...
April 11, 2008

chemistry
Lab: Creating a Redox Table Purpose: The purpose of this lab exercise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this exercise, you will see how more extensive tables of relative strengths of oxidizing and reducing agents have...
April 11, 2008

chemistry
19 mL of 0.50 mool/L NaOH which is standardized becomes titrated alongside 24 mL of 0.44 mol/L acetic acid. Determine the pH of the solution Please judge my work: Becasue NaOH and acetic acid react in a 1:1 ratio, initital moles of acetic acid =0.0019 L x 0.44M = 0.000836 mols...
April 9, 2008

chemistry
An AgNO3 solution (44 mL/0.44 M) has been mixed with an NaCl solution (83 mL/1.35x 10^-2 M) a)Determine the ion product of the precipitate(potential precipitate) b) Would a precipitate be created? The Ksp of AgCl(s) proves to be 1.8 x 10^-10
April 9, 2008

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