You are instructed to create 200. mL of a 0.27 M phosphate buffer with a pH of 7.8. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l) equilibrium reaction arrow ...
February 27, 2015
someone please answer these Physics Q answers no explanation 1 What is the opposite force to gravity 2 an example of a contact force 3 an example of a non-contact force 4 What effect does mass have on inertia 5 two examples of forces that could slow an object down ...
November 5, 2014
A swimmer travels from the south end to the north end of a 30.0 m pool in 15.0 s and makes the return trip to the starting position in 19.0 s. What is the average velocity for the roundtrip?
May 14, 2014
A baseball player hits a ball toward the outfield. The height h of the ball in feet is modeled by h(t) = -16t2 + 22t + 3, where t is the time in seconds. If no one catches the ball, how long will it stay in the air? (Round to the nearest tenth of a second and enter only the ...
February 13, 2014
You want to build a garden around your garden. One side borders your house so it does not need a fence. If you only have 50m of fencing what dimensions should you make your garden in order to maximize the area?
January 26, 2014
The Banking e-Teller system allows bank customers to perform ATM transactions from their cell phone. BET will allow customers to check balances, make remote capture deposits, and perform balance transfers to their checking or savings account. Balance transfers should only be ...
January 21, 2014
programming logic and design
The Daily Gazette accepts classified ads in several categories. For most ads, the newspaper charges 10 cents per word for the first 50 words, and 8 cents per word for every word after that. Design a flowchart for a program that accepts data about an ad: customer name, ad ...
February 27, 2013
A 5-kg crate is resting on a horizontal plank. The coeï¬- cient of static friction is 0.5 and the coeï¬cient of kinetic friction is 0.4. After one end of the plank is raised so the plank makes an angle of 25 with the horizontal, the force of ...
January 20, 2013
consider the following equilibrium: Mg(OH)2(aq) <-> Mg2+ (aq) + 2OH-(aq) a) what would happen to the equilibrium if some acid is added to the soultuion? --->OH- would increase causing Mg(OH02 to dissolve b) what would happen to the solubility of Mg(OH)2? ---> it ...
October 29, 2012
Given a saturated solution of CaF2, write the ionic equilibrium and use it to calculate the solubility of CaF2. My answers for the ionic equation and ksp values are CaF2(s)<->Ca2+(aq)+ 2F-(aq) Ksp= [Ca2+][F-]2 ksp=2.02*10^-4 it asks what will happen to the value of ksp ...
October 29, 2012
The string on a violin has a fundamental frequency of 120.0 Hz. The length of the vibrating portion is 36 cm and has a mass of 0.58 g. Under what tension (in newtons) must the string be placed?
May 7, 2012
Can anyone help me with this? After the sentence, identify the underlined part as a prepositional phrase used as an adjective, prepositional phrase used as an adverb, participle, participial phrase, infinitive, or infinitive phrase. Would you like to know more about ...
September 23, 2011
Two slits are illuminated by a 536 nm light.The angle between the zeroth-order bright band at the center of the screen and the fourth-order bright band is 16.1 degrees. If the screen is 176 cm from the double-slit, how far apart is this bright band from the central peak? ...
February 5, 2011
All but two gaps within a set of venetian blinds have been blocked off to create a double-slit system. These gaps are separated by a distance of 3.1 cm. Infrared radiation is then passed through the two gaps in the blinds. The angle between the central and the second-order ...
February 5, 2011
Jamaal, a player on a college basketball team, made only 50% of his free throws last season. During the off-season, he worked on developing a softer shot in the hope of improving his free-throw accuracy. This season, Jamaal made 54 of 95 free throws. We want to test the ...
November 3, 2010
A stone is thrown horizontaly from the top of a 25.00-m cliff. The stone lands at a distance of 40.00 m from the edge of the cliff. What is the horizontal velocity of the stone?
October 22, 2010
what mass of lead (ii) iodide (pbl2, mass=461 amu)is precipitated by the addition of an excess of potassium iodide (ki, mass=166 amu)to 50.0 ml of 0.60 m lead (ii) nitrate (pb(no3)2, mass=331.2 amu)?
October 20, 2010
a man has only 4 simple pulleys to lift a heavy load of 6000N. in roder to lift the load easily, he combines the pulleys (3 moveable, 1 fixed). given that the frictional forces are 300N, what force must he apply in order to lift the load?
September 2, 2010
Your asking for how many combinations and not the probability so ignore the answer above. First find the number of combinations if all letters and numbers can be repeated (26*26*10*10*10*10)=6760000 Then find the number of combinations if none were repeated (26*25*10*9*8*7)=...
July 30, 2010
research paper on code of medical ethics opinion 5
No one Principle of Medical Ethics can stand alone or be individually applied to a situation. In all instances, it is the overall intent and influence of the Principles of Medical Ethics which shall measure ethical behavior for the physician .Now days many copywriting services...
June 24, 2010
A 3.455 g sample of vinegar is titrated. It requires 16.83 mL of 0.2145 M NaOH to get to the phenolphthalein end point. Calculate the weight percent of acetic acid in this sample of vinegar. ____ % Note: calculate the molecular weight to one decimal place, so the answer should...
May 5, 2010
Compare the properties of elements and compounds. Give two examples of each, including one example that exists in the human body. Explain the atomic nature of one element and one compound found in human body.
April 11, 2010
im a high school student and my school does not give us a book. they just give us the paper and tell us to do the best we can. i just dont understand the way the question is worded. does it want to know what kind of technology is used and how it helps or does it want to know ...
September 16, 2009
Your speed will increase with each day's practice. future tense Because of snow and ice on the runway, our departure will be several hours late. present tense Could someone tell me if these two answers are correct to the sentences?
April 2, 2009
science plzzz help
1 what si the diference between mass and weight? 2 will the following substances float or sink in water at 3.98 degree celcius? Mass volume float & sink 25g 50ml ? 65g 40ml ? 36g 35ml ?
September 21, 2008
A linear regression equation of best fit between a student's attendence and the degree of sucess in school is h = 0.5x + 68.5. the correlation coefficent, r, for these data would be (1) 0 < r < 1 (2) -1< r < 0 (3) r = 0 (4) r = -1
September 21, 2008
HELP! parenthetical citation
I have a whole paragraph that basically summarizes a story. I have my own insight in the story. For example.. in this story blah blah blah I think that so and so blah blah blah. after doing this he did blah ... etc. i'm supposed to have three citations within my paper. do ...
February 15, 2008
In one of my paragraphs I am using one source. It's an online source about a case. One quote is a quote made from a judge, and the other quote is directly from the author of the article. Do I have to cite the one from the judge, cause it's quoted within the paper?
February 14, 2008
I'm supposed to compare and contrast the Democrat and Republican party. I can't find a good site that just gives this information in black and white. I want statistics and facts, any site ideas?
November 1, 2007
imagine that you added helium gas to a partially inflated mylar ballon, and expanded as the gas was added. During this expansion process, do you think the pressure of the helium gas inside the ballon increased , decreased or remained fairly constant? Assume the temperature of ...
October 16, 2007
I have a question. What is the difference between gravitational mass and intertial mass? http://www.thefreedictionary.com/gravitational+mass http://www.google.com/search?hl=en&ie=UTF-8&defl=en&q=define:Inertial+mass&sa=X&oi=glossary_definition&ct=title
August 19, 2007
Is the the we'll a Snynonym or a homomym? Please rephrase and proofread. Your question is not clear. Thanks. =) A synonym is a word that means the same thing as another word. ex. lawyer, attorney A homonym is a word which sounds the same another word, but means something ...
April 25, 2007
plz explain or translate this question!!!
How were things resolved? what does this sentence mean? how do you write your answer for this Q? The sentence means there were two or more differing opinions, measurements or explanations about something. You are supposed to find out which is correct, or explain how the ...
December 7, 2006
If gCrisis,h as the families call this center, puts a visitor in mind of a safe haven, it is nearly the last haven one will find. What does this sentence mean? I am confusing to understand it... Please tell me. One mile is 5280.How many feet is five miles? no it ...
November 13, 2006
Take time to write down anything in relation to the text. If you're intrigued by certain statements or if you are attracted to characters or issues or problems, write your response. This is the direction of journal that I have to write. How should I write my journal ...
November 12, 2006