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March 30, 2017

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Posts by joseph

Total # Posts: 580

phys
“There are many social and cultural contexts you interact with that strongly influence development. These contexts include people you interact with daily, neighborhood factors, and larger scale social and cultural variables. In order to fully understand how the ...
September 7, 2010

science
Balance in acid solution PH3+ I2-> H3PO4+ I-
September 6, 2010

chemistry
write the net ionic equation for the following : 2CuCl(aq)-> CuCl2(aq)+ Cu(s) 4NaCl(aq)+2H2SO4(aq)+MnO2(s)-> 2Na2SO4(aq)+2H2O(l)+Cl2(g) 3KOH(aq)+Fe(NO3)3(aq)->Fe(OH)3(s)+ 3KNO3(aq)
September 6, 2010

Science
ok, i got them. just want to make sure the answer are correct. thanks
August 20, 2010

Science
Give the conjugate acid of the following bases: a) NH2-, b) CO3 ^2-, c) HS-, d) OH-
August 20, 2010

Science
Is it O2(S) is denser right? Because it's solid
August 20, 2010

Science
thanks, i typed it wrong
August 20, 2010

Science
The normal melting and boiling point of O2 are -218C and 49.8atm. a)Sketch the phase diagram for O2. b) Which is denser, O2(S) or O2 (l)? explain.
August 20, 2010

science
Could I use STP( 760 torr and 273K) to plug in the equation ?
August 13, 2010

science
The equation require 2 pressure but there is only 1 in this problem
August 13, 2010

science
On top of one of the peaks in Rocky Mountain National Park the pressure of the atmosphere is 500.torr. Determine the boiling point of water at this location. The heat of vaporization of water is 40.7 kJ/mol? Show work for me please! Thank you
August 13, 2010

science
which would have a lower melting point, C3H6 or CH30H? explain please!
August 12, 2010

science
NH2-,NH3, and NH4+ have H-N-H bond angles of 105, 107, and 109. Explain this variation in bond angles
August 12, 2010

science
NH2-, NH3, and NH4+ have H-N-H bond angles of 105, 107 and 109. Explain this variation in bond angles.
August 10, 2010

science
which would have a lower melting point, C3H6 or CH30H? explain.
August 10, 2010

Science
Consider the following reaction: 2Na + Cl2  2NaCl ΔH = -821.8 kJ (a) Is the reaction exothermic or endothermic? (b) Calculate the amount of heat transferred when 5.6 g of Na reacts at constant pressure. (c) How many grams of NaCl are produced during an enthalpy ...
August 3, 2010

chemistry
I don't get which one is Tfinal, and Tinitial for both of them can you explain it? thank you
August 3, 2010

chemistry
A small “coffee cup” calorimeter contains 110. g of H2O at 22.0°C. A 100. g sample of lead is heated to 90.0°C and then placed in the water. The contents of the calorimeter come to a temperature of 23.9°C What is the specific heat of lead?
August 3, 2010

Chemistry
A gaseous mixture of O2, H2, and N2 has a total pressure of 1.50 atm and contains 8.20 g of each gas. Find the partial pressure of each gas in the mixture They don't give you Volume and Temperature. Please explain it to me, thank you!
August 2, 2010

chemistry
Sterling silver, an alloy of silver and copper, contains 7.5 percent copper by mass and has a density of 10.3 g/cm3. How many copper atoms are in a sterling silver sphere whose radius is 2.0 in?
August 2, 2010

chemistry
Calculate the molarity of the solution produced by mixing (a) 50.0 ml of 0.200 M NaCl and 100.0 ml of 0.100 M NaCl;
July 27, 2010

Chemistry
how many hours are in a day? 12! So... just take the 6 as the numerator and the 12 as the denominator (6/12) and if you simplify so it will be (1/2) and if you turn that into s percentage it will be %50. THE ANSWER IS AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAaa
July 19, 2010

Math
cool
May 10, 2010

math
what is 15% of 35?
April 28, 2010

english
write a pargraph of about 50 words on the topic job seeking is a task that needs courage as well as patience
April 22, 2010

chemistry
find the mass of solute needed. 3.0 liters of 2.0 M NaOH. or 500ml of 1.5 M NaCl?
April 20, 2010

Grade 12 English - College Assignment
job seeking and courage
April 8, 2010

12th grade
cos x sin x
March 31, 2010

stats
A statistics practitioner formulated the following hypothesis: H0 : ì = 200 against H1 : ì < 200 and learned that x = 190 n = 9 and ó = 50. The p– value of the test is (1) 0.6 (2) 0.2743 (3) 0.7743 (4) −0.2743 (5) Cannot be found with ...
March 31, 2010

stats
A bakery stated that the average number of breads sold daily is 3000. An employee thinks that the actual value might differ from this and wants to test this statement. The correct hypotheses are: (I think it is 1) (1) H0 : ¦Ì = 3000 H1 : ¦Ì not= ...
March 31, 2010

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 don't 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 don't really get out to solve for it actually. ln (P2/760 torr)= -38560/8.3145 * (1/291.15 - 1/351...
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 didn't 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

10th grade english
I don't think that is a good idea to ask somebody here to write your paper instead of you. I would recommend you to contact Supreme essay service. Give them a try. Good luck!
December 21, 2009

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

Essay
There are so many different tips and hints available online. Why don't you google? As well, you can check how can Supreme essay guys help you. They are real professionals in what they do. Give them a try. Best of luck!
November 11, 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

essay writing
I guess all of them are important in some way. I would rather choose A. I don't think you still need help with it, anyway. That's why I would recommend you to contact Supreme essay service. Those guys are real professionals in what they do. So you can definitely give ...
October 20, 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

essay writing
I can agree with Ms.Sue those three elements are really important. You can find an outline. rules for rewriting and some tips for writing an effective thesis statement available on the net. In case you would need some professional help, I would recommend you to contact Supreme...
October 8, 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

Essay Outline
Check how can Supreme essay guys help you. Those guys are real professionals in what they do. Introduction: Usually an introduction starts broad and narrows down to your specific topic, ending in the thesis. This is your opportunity to establish why readers might be curious ...
June 16, 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 grammar.
March 15, 2009

English-Ms.Sue
An argumentative essay uses reasoning and evidence—not emotion—to take a definitive stand on a controversial or debatable issue. The essay explores two sides of a topic and proves why one side or position is the best.Choose a specific issue to discuss. Research both ...
February 25, 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

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