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December 20, 2014

Posts by dave


Total # Posts: 639

Chemistry
WHat are the structural formulas for glycerin, hexane, and ethanol. Do these structural formaulas support the solubility data obtained?? It is almost impossible to draw structural formulas on the computer. In line formulas may help. But you need to refine your question to ...
February 20, 2007

Chemistry
Based on the fact that calcium carbonate is an ionic compound, why is it insoluble in water???? Look up your solubility rules. I'm not really sure why, but I know my book states right off that Most sulfide, carbonate, and phosphate salts are only slightly soluble. Slightly...
February 18, 2007

Algebra II
Our current assignment is to find the LCM, Least Common Multiple of two polynomials. I think I'm doing it right but I'm not quite sure. For the first question: 2t^2+t-3, 2t^2+5t+3 I have 2t^2+t+3 as the LCM. Is this correct or can somebody step me through the correct ...
February 15, 2007

AP Chemistry
(a) What is the pH of a 2.0 molar solution of acetic acid. Ka of acetic acid = 1.8 x 10¯5 (b) A buffer solution is prepared by adding 0.10 liter of 2.0 molar acetic acid solution to 0.1 liter of a 1.0 molar sodium hydroxide solution. Compute the hydrogen ion concentration...
February 13, 2007

Physics/Math
dude, this problem is impossible
February 12, 2007

CHEMISTRY
When air pollution is high, ozone (O3) contents can reach 0.60 ppm (ie., .60 mol ozone per million mol air). How many molecules of ozone are present per liter of polluted air if the barometric pressure is 755 mm Hg and the temperature is 79 degrees F? I converted temperature ...
January 4, 2007

Pre-Calc
Trigonometric Identities Prove: (tanx + secx -1)/(tanx - secx + 1)= tanx + secx My work so far: (sinx/cosx + 1/cosx + cosx/cosx)/(sinx/cos x - 1/cosx + cosx/cosx)= tanx + cosx (just working on the left side) ((sinx + 1 - cosx)/cosx)/((sinx - 1 + cosx)/cosx) ((sinx + 1 - cosx)/...
January 2, 2007

Geography
i need question 9 and 11 also volcanoes is 4 and tsunami is 12
January 2, 2007

Chemistry
I have a problem that I wasn't sure how to do, and I want to see if my reasoning behind getting the answer is correct. Question: If .0129 mol of N2O4 effuses through a pinhole in a certain amount of time, how much NO would effuse in that same amount of time under the same ...
January 1, 2007

Chemistry- partial pressures
A sample of gas collected over water at 42 degrees C occupies a volume of one liter. The wet gas has a pressure of .986 atm. The gas is dried and the dry gas occupies 1.04 L with a pressure of 1.00 atm at 90 degrees C. Using this information, calculate the vapor pressure of ...
January 1, 2007

Chem
Nitric acid can be prepared by bubbling dinitrogen pentoxide into water. N2O5(g) + H2O -> 2H+(aq) + 2NO3-(aq) a) How many moles of H+ are obtained when 1.50 L of N2O5 at 25 degrees C and 1.00 atm pressure is bubbled into water? b) The solution obtained in (a) after reaction...
January 1, 2007

English Essays
Can someone please find me essays describing ethos, pathos, logos, in Narrative of Frederick Douglas and Autobiography of Malcolm X? I would greatly appreciate it!!!!!!!!!! Thanks!!!!!!!!!!!! I assume that your assignment is to write essays about ethos, pathos, and logos in ...
December 27, 2006

Math
I have a practice question that I am stuck on and need help. A certain insect pest has infested a cornfield. The pests are spreading through the field in a circular pattern at the rate of 3m/day. When the radius of the infested area is 70m. How fast is the area of the infested...
December 3, 2006

Chemistry
I was not the person who wrote that question last night? Chemistry - DrBob222, Wednesday, November 15, 2006 at 7:24pm Yes, it is possible in some cases. For example, CoCl2 is blue in the unhydrated form and pink in the hydrated form. As a kid, I used a water color brush to &...
November 16, 2006

science
a satellite is in geosynchronous orbit 36,000 km above earth. describe how you would fond the speed of this satellite.\ http://en.wikipedia.org/wiki/Geosynchronous_orbit
October 28, 2006

science
I need help with this problem:you live in the middle of a block that is square and one mile around. there is a stop sign on each corner. if your carcan only accelerate and brake at one meter per second per second, describe how you would get around the block in the fastest way...
October 28, 2006

society
What are the most significant similarities between the Chinese American and Japanese American [cultural] experiences? What are the differences? • Choose from any of the following topics when considering similarities and differences: o Level of assimilation o Relative ...
October 19, 2006

question
What are the most significant similarities between the Chinese American and Japanese American? when it comes to thePursuit of education? Education is a very high priority in all Oriental society.
October 19, 2006

CULTURAL DIVERSITY
If someone made the below statements to you, how would you explain that the statements are misconceptions? 1. Asian Americans and Pacific Islanders are a model minority. 2. Asian Americans and Pacific Islanders belong to a single "Asian American" culture. Do you ...
October 19, 2006

CULTURAL DIVERSITY
What are the most significant similarities between the Chinese American and Japanese American [cultural] experiences? What are the differences? • Choose from any of the following topics when considering similarities and differences: o Level of assimilation o Relative ...
October 18, 2006

physics
8225 km
October 16, 2006

grammar
Rewrite the following sentences, focusing on the grammar area specified in the left column. To enter your answer, click next to the number and begin typing. If the sentence is already correct, write No Change. Punctuation within Sentences—Colon The book had some nice ...
October 10, 2006

Business Report Writing
Have you ever seen a communication with poor formatting that made it difficult to understand? Did the message lose some of its desired effect due to the problems? Yes I have. Yes it did.
October 10, 2006

English
WHy is the importance of being open to new ideas? This is a very vague question, but this is my thought: The question of the importance of being is open to new ideas because it is an unsolvable question. Being unsolvable, new perspectives will always come into play. The ...
October 7, 2006

Accounting
I'll start with the first part of my problem. This is a long assignment since it is a weekend one. Part 1: Incomplete Comparative Balance Sheet. The percentage of Increases/decreases are to the side. And Accumulated Depreciation is listed twice. I'm assuming that is ...
October 1, 2006

Chemistry
How might one separate a mixture of water and salt? A solution of water and salt may be separated, if you don't want the water, by allowing the water to evaporate which will leave the salt crystals behind. If you want the water AND the salt, you may separate them by ...
September 9, 2006

History help!!!!!!!!
Why did the colonists react to the Coercive Acts with boycotts and convening the First Continental COngresss? in 1764, the British Parliament passed the Sugar Act. Many of the colonists were unwilling to pay tax which was imposed - this is what started everything. This was the...
September 3, 2006

microeconomics
Ok, if anyone is able to help me within the next 12 hours or so, that would be wonderful! I think I am going about this problem correctly -- I am not looking for someone to solve this problem for me, but for someone to tell me if I am doing it right... You can see this chapter...
August 31, 2006

Chemistry HELP!!
Can you identify a metal if you know its density? Explain Do you think that determining the volumes of metal samples by measuring their dimensions and calculating would be more r less accurate than determining volumes by water displacement? Explain. Would measuring the ...
August 29, 2006

Economics
#2 is A
August 15, 2006

1 question+chem!
#11) The information: An unidentified acid with a concentration of 1.0 mol/L has been given to you to identify. The acid appears in your data booklet on the Relative Strengths of Acids and Bases table. The following test results were recorded: 1. Methyl violet is yellow when ...
August 4, 2006

Chem.
10. Suggest how two very different variables could be manipulated to increase the percent yield of sulphur trioxide. The equation for the reaction follows. 2 SO2(g) + O2(g)>>> 2 SO3(g) + energy Ok, I really dont know this one. Can you please help? Thanks! You need to...
July 24, 2006

sociology
LOL wow Go AXIA!!! Funny but sad at the same time lol
July 20, 2006

"le Chat. Principle" #2
Hi, there are 5 questions and I was wondering if you could check them for me. Thanks! 3. The hypothetical equilibrium reaction represented by the equation that follows. QA(s) + 2 X(g)>>>Q(l) + X2A(g) + energy This reaction can be shifted to increase the yield of ...
July 19, 2006

"le Chat. principle".
Hey, can you check this, this is regarding "le Chat. principle". Thanks! #1) The value of the equilibrium constant for the reaction H2CO3(aq) + energy >>> H2O(l) + CO2(g) can be changed by introducing a change to which component of the equation? My answer: ...
July 19, 2006

History
Has anyone read the book A People's History of the UNited States? if so, can you help me with a question about the first chapter? How does Zinn's story of first contact differ from your own prior knowledge of the story? I haven't read this text, but the reviews ...
July 18, 2006

Chemistry
Hey, can you help me on this question: Question: A 2.3 kg iron object is placed in an oxygenated tank of 1.00 mol/L hydrochloric acid. What volume of hydrochloric acid would react to completely consume the iron object? My question: when I seperate the H and Cl, and make the ...
July 17, 2006

chem. check
Can u please check these questions..thanks! Redox Stoichiometry 1.A 2.45g zinc metal strip is placed into an 2.3 x 10-1 mol/L solution of tin (II) bromide. If all the zinc and tin (II) bromide react, what was the volume of the solution. My answer: 8.62L is the volume of the ...
July 12, 2006

help me asap
hi I'm taking sat II lliterature test and i was wondering if you can give me a site where i can take a practice test online for free. Check these sites. http://www.collegeboard.com/student/testing/sat/lc_two/lit/format.html?lit http://testprep.sparknotes.com/testcenter/ap/...
June 24, 2006

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