Questions Asked on
March 6, 2007

math, algebra
what are some challenges about working with rational expressions? Math is a language. Getting it precisely right is a lot easier than describing it in a vague statement in English such as you ask. Is there a chance you can change teachers? If so, I
asked by jas20 
psychology
In a study, a few students did the number Stroop and color Stroop. They showed much less interference on the numbers than they did on the color task. Why does this make sense? Please check these sites. If you post your answer, we'll be glad to comment on
asked by jason 
chemistry
help required in calculating the pH value of a .84 mols per litre solution of sulfuric acid. I understand that pH = log 10 (2x 0.84), I am not very experienced with logs and need assistance as to which keys to press on the scientific calculator in
asked by ruby 
science
A 0.21 g of Sulfuris acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration (in mol 1 1) in this solution. Give your answer in scientific notation to an appropriate number of
asked by Gemma 
Chem
using the properties of sodium cyanide , deduce the type of bonding that holds this compound together, explaining how you arrived at your conclusions. write a balances equation for the reaction that occurs when sodium cyanide dissolves in water. Any help
asked by Kirsty 
science
In the process called fluorescence, some substances absorb photons of one kind of radiation (e.g) ultraviolet radiation), and give out photons of a different kind (e.g visible light). When infrared radiation falls on these materials, visible light is not
asked by Kelvin 
chemistry
The isotype caesium 137, which has a half life of 30 years, is a product of nuclear power plants. How long will it take for the amount of this isotype in a sample of caesium to decay to onesixteenth of its original amount? first half life 1/2 second 1/4
asked by Charley 
Math, Calculus
Find the derivative of the function. y= xcosx  sinx What's the derivative? I get only one trig function. I will be happy to critique your work or thinking. Use the chain rule on the first term. Our class hasn't covered Chain Rule. Only product and
asked by Jonah 
Chem
I have a problem in which I'm solving for w. My equation is this: w= nRT ln V2/V1 However, I don't know the value of n, but I do know the values of P, V, and T. If I fill in (PV/RT) for n in the above equation, would I be using the energy R or the gas R?
asked by Alyssa 
chemistry
please can u help i need to a structure of a polymer and i dentify the monomer unit and include three monomer units,from the compound CH2=CHCHOH CH3 AND STATE THE POLYMERIZATION INVOLVED IN FORMING THE POLYMER,please help i have tried ,but i cant make
asked by jane 
World war one! thanks!
Right before the war Imperialistic, territorial, Nationalism and economic rivalries had been intensifying among Germany, France, Great Britain, Russia, and AustriaHungary. The Balkan war was from 1912 to 1913; all the major powers increased in size as
asked by essay+ can some edit my paragraph?Thanks! 
geometric sequence
how whould u find the next 3 terms of sequence 18,9,9/2,9/4 Each term is the last multiplied by 1/2. dont got one i think that is right
asked by ebony 
Science
A drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of "40cm2". Assume that the oil film has a uniform thickness equal to the diameter of a oil molecule. Calculate the
asked by Grant 
math help major test
which numbers are four units from 1? It may help to look at a number line like the following (as an example): Can you determine which numbers (both negative and positive) could be 4 units from 1 ? I'm not sure if this is what you were asking, but I hope
asked by kate 
Quantum Physics
Each element has a different set of energy levels. Use this fact to "explain" whay the colour of the light emitted by an element in the gaseous state is characteristic of the element. When an electron falls from one of the higher energy levels to a lower
asked by Grant 
Science
Explain, with the help of an appropriate labelled sketch diagram, how a hydrogen atom, which has only one electron, has so many spectral lines. The diagram of the energy levels follows:    
asked by Adam 
help me math
if the percent was 56 what would the fraction value be and the decimal value Please read my previous answer to "kate" http://www.jiskha.com/display.cgi?id=1173141658
asked by bobby 
SCIENCE
Which action would result in more (financially) valuable product: taking one proton from each nucleus in a sample of gold or adding one proton to each gold necleus? Explain (ignore the role of elections on the atom) Make the protons add up. 79Au ==> 1p +
asked by Julie 
Chemistry
The isotope caesium137, which has a half life of 30 years, is a product of neuclear power plants. How long will it take for the amount of this isotope in a sample of caesium to decay to one sixteenth of its original amount. Explain answer 30 years 1/2 60
asked by Julie 
major math
which numbers are four units from 1? 3, 5 are both four units away on the real number line.Donna E. Shalala
asked by kate 
math
if the percent was 56 what would the fraction value be I will be happy to check your work on this. Percent means per 100, or /100
asked by kate 
math
if you simplify 15/72 would it be 5/24 yes or no? Yes
asked by may 
Written Communication
How would you approach creating a negative message for a superior (such as a menager at work or an instructor) versus creating a message for a colleague, subordinate, or fellow student. The basic difference to me is that you cant afford to tell a manager
asked by Tameka 
frankenstein
for this question is the answer true One sign that Frankenstein is declining during his study is that he becomes unresponsive to the beauty of nature
asked by casey 
frankenstein
for this question is the answer true Frankenstein says, "Like Adam, I was apparently united by no link to any other being in existence http://www.kimwoodbridge.com/maryshel/knowledge.shtml read the last 4 paragraphs. Then also
asked by casey 
Chem
Concerning compounds cyanogen, Hydrogen cyanide and sodium cyanide. Cyanogen = C2N2 (CN)2 Hydrogen Cyanide = HCN boils at 26C and yeilds an acid solution when added with water. Sodium Cyanide = empirical formula NaCN is a solid melts at 564C a) Assuming
asked by Lacey 
Chem
Concerning compounds cyanogen, Hydrogen cyanide and sodium cyanide. Cyanogen = C2N2 (CN)2 Hydrogen Cyanide = HCN boils at 26C and yeilds an acid solution when added with water. Sodium Cyanide = empirical formula NaCN is a solid melts at 564C a) Assuming
asked by Lacey 
English
We are putting together a scrapbook for my older sister, and we came up with some dictionary definitions for parts of her name, but does anyone know of a meaning for "Valaitis"? Thanks for any help. Thank you for using the Jiskha Homework Help Forum. What
asked by Jenna 
U.S History
Hey, I have a research paper for my college U.S History class and I'm having the hardest time thinking of a topic! It can be about absolutely anything that is correlated with U.S history. I'm sort of interested in World War II, and the Andrew Jackson era.
asked by Cristina 
Math
Round 427,685 to the nearest thousand. 428,000
asked by Dan 
physiology (nernst equation)
If cell depolarises at +50mV, what are the concentrations of K+? I am really confused how to use the nernst equation to get the concentrations. If I set up 58 [Kout]/[Kin] = 50, will that be right? I am not sure how to start this problem.
asked by Anna 
variables
what makes variables difficult to understand?
asked by randy 
Complex Analysis
Use the Cauchy Integral formula to evaluate foC (closed curve) f(z) dz, where C is oriented anticlockwise, for f(z) = (z + i)^2 / (z + 3  2i)^3 and C is the circle z + 2 = 5. Thanks.
asked by Karen 
general science
What are the four main directions? Check this site for the four cardinal (main) directions. http://worldatlas.com/aatlas/infopage/comprose.htm
asked by amanda 
Math Probabilities
A bag contains 9 red chips and 12 blue chips. Two chips are selected randomly without replacement from the bag. What is the probability that the two chips are the same color? That would be the probability of two reds PLUS the probability of two blues. The
asked by J 
Raj....English Thesis
My teacher said that I only put that he "appears" to be a hypocrite, and that I need to clearly state if he is a hypocrite or not. Also, by putting "and three examples can be cited to demonstrate this trait of his", is a pretty weak thesis, she says. I
asked by GuruBlue 
Science
Should there be more or less exploration and mining on public lands in the United States? Explain your answer. What is your answer? Please post it, and we'll be glad to comment on it.
asked by Jaan 
information literacy
what year was the oldest copy of Ralph Ellison's Going to the Territory published? That book was published in l986
asked by rita 
Info. literacy
what is the call number of the oldest copy of Ellison's Shadow and Act? Ask your librarian for the call number for her library on that book what is the call number of the oldest copy of Ellisons shadow and act
asked by rita 
Physics
In a game of pool the cue ball strikes another ball of the same mass and initially at rest. After the collision the cue ball moves at 3.50 m/s along a line making an angle of 22 degrees with its original direction of motion. and the second ball had a speed
asked by Nat 
english
I am creating a resource page for an essay. Problem is a lot of my citations came from the same online encyclopedia which list its author as "Wikipedia contributors" So all the pages reference the same except the article title and url. The in text citation
asked by crystle 
Science
which would be the most likely forms that you would consider using within the next year? What personal advantages or disadvantages would prompt your decision? Thank you for using the Jiskha Homework Help Forum BUT your question is unclear. When you refer
asked by Jaan 
Spanish
How would you conjugate the verb "decir" which means to say, to the "yo" form? Would it be digo? Or dico? Please help! Thank you for using the Jiskha Homework Help Forum. The verb "decir" is irregular in the "yo" form of the Present Indicative Tense: digo,
asked by Tavia 
math
how do you8 find unit rate divide quantity by time. For instance, one travels 45 miles in 1/2 hour. Unit rate= 45/.5=90miles/hr the answer to your problem is x=18 the answer to your problum is x=18
asked by brianna 
Chem
I don't believe I'm getting the correct answers for this problem. Could someone look over my work and verify whether it is correct or not? One mole of an ideal gas (Cv = 3/2R) at 300. K expands adiabatically against a constant external pressure of 2.00 atm
asked by Chris 
Language Arts
Could someone read the passage and please tell me which answer is correct? Some kids collect coins. I can't keep a quarter without spending it. Some kids collect stuffed animals. Cute, but my room is the size of a closet. Where am I going to put alot of
asked by Jessica 
Math fraction equations
How would I solve this equation? d1 = 1 1 ____ ___ 4 2 (d1) divided by 4 = 1 and 1/2 Thanks, Ok, I'll set up your problem this way: (d1)/4 = 1 1/2 1 1/2 is the same as 3/2. Therefore: (d1)/4 = 3/2 Multiply each fraction by a common denominator,
asked by Sarah 
English
If someone made the statements to you, Asian Americans and Pacific Islanders are a model minority, and Asian Americans and Pacific Ishanders belong to a single "Asian American" culture. How would you explain that the statements are misconceptions? Include
asked by jenna williams 
Math
My question is to get a better understanding of this. Basically, these two problems, I did it WITHOUT replacement. So I would multiply each defects and so forth. My question is, would I have to subtract the total from 1 in the second question? I am not
asked by J 
humanities
I am writing a short monologue on a person who chooses not to believe in any religion, but its back in when religion was not an option, in greece in like 300 BCE How can it improve, what can I add? Why do we act this way? Us humans, worshiping immortals
asked by lizzie 
social studies
what do people who live in mozambique wear on their day to day activities http://www.google.com/search?source=ig&hl=en&q=mozambique There are all kinds of sites to sift through here. If you find nothing, you might try refining the search to mozambique
asked by lauren 
chemistry
Can someone please check my work on this problem? That'd be great!: What is the balanced equation for the chemical change of adding Na2CO3 to CuCl2, therefore making CuCO3 form? CuCl2+Na2CO3>CuCO3+2NaCl right thank you fill in the blanks! Nuclear
asked by Fidelia 
Calculus
I know how to find the interval of convergence, but I don't understand when to check for convergence at the endpoints (to see if I should include it or not) Could someone help me understand this? Thanks!
asked by Jin 
algebra
How do you simplify this expression, assuming all variables are positive? (3a^1/2b^1/3)^2 The carrot symbol represents exponents. It is a^1/2 and b^1/3, just so you know. Square each term in the parenthesis. 3^2 = 9 (a^1/2)^2 = a (b^1/3)^2 = b^2/3 Put it
asked by Sally 
chem
If an ideal gas is allowed to expand into a vacuum, this means that the external pressure is 0. This doesn't affect the internal pressure though, correct? For example: I have a problem in which one mole of an ideal gas at 300. K and at a volume of 10.0 L
asked by Chris 
organic chemistry
one mole of triphenylmeethanol lowers the freezing point of 1000g of 100% sulfuric acid twice as much as one mole of methanol. How do you account for this observation? the only thing I can think of that would explain that would be intermolecular forces.
asked by kim 
CalculusLimits
Okay, i posted this question yesterday, however, I did not really understand the answer I received. If your the one who answered my question, could you please elaborate. If not, could you try to answer this tough, for me, question. Thanks a lot. lim x>0
asked by Matt 
chemistry  kinetics
The activation energy for the isomerization of methyl isonitrile is 160 kJ/mol. Calculate the fraction of methyl isonitrile molecules that have an energy of 160 or greater at 500 K? 510 K? What is the ratio of the fraction at 510K to that at 500K? I missed
asked by Mark 
science
what determine's the direction that Halley's comet points? The tail points away from the sun.
asked by ali 
English/GuruBlue
I needed to write an essay on how Hamlet is a hypocrite and my three points were that he doesn't obey his father right away, he says he loves his mother but treats her badly, and he says he loves Ophelia but he is the cause of her madness. But now, my
asked by Raj 
Econ MC
Two firms, A and B, each currently dump 50 tons of chemicals into the local river. The government has decided to reduce the pollution and from now on will require a pollution permit for each ton of pollution dumped into the river. The government gives each
asked by Anonymous 
Chemistry
Would a substance that does not form hydrogen bonds have a high or low surface tension? What about vapor pressure, specific heat,heat of vaporization or boiling point? It requires extra energy to break hydrogen bonds so a substance that does not form H
asked by Dave 
ELa
wat is a noun after all these years i have forgotten Thank you for using the Jiskha Homework Help Forum. A good dictionary will always help you and here is what my Online Dictionary says for noun: Date: 14th century : any member of a class of words that
asked by jose 
English
What type of sentence is this? On July 4, 1976, the nation’s bicentennial, 10,741 American flags were flown over the U.S. Capitol, the largest number ever flown there in one day. It's a simple sentence with two appositives. Can you please help me with my
asked by Shanice 
earthworms
what is a pharynx? Check this site for a diagram of an earthworm, including the pharynx. http://www.infovisual.info/02/006_en.html
asked by nancy 
Organic Chemistry
What is the product formed from a reaction of butanal and sodium hydroxide? cyclopentanone and sodium hydroxide? acetophenone and sodium hydroxide? Thanks. You want to look up information about the Aldol condensation.
asked by Rob 
Chem
Calculate the pH of a solution composed of 155mL of 0.1 M acetic acid and 45 g of sodium acetate. The pKa of acetic acid is 4.76. MY ANSWER: pH = 4.76 + log(3.53M/0.1M) pH = 6.31
asked by Marisol 
Chemistry
Would CH4 dissolve in water? Why or why not? CH4 is nonpolar. H2O is polar. CH4 is not soluble in water.
asked by John 
physic
What does “seven earths" as mentioned in surah atTalaq actually mean?. what is each cointing on earth? please give detail answer.
asked by suhana 
MATH
A plane flying with a constant speed of 24 km/min passes over a ground radar station at an altitude of 4 km and climbs at an angle of 45 degrees. At what rate, in km/min, is the distance from the plane to the radar station increasing 2 minutes later? Rate
asked by Jia 
MATH
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.2 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 8 cm? (Note the answer is a positive number). Rate =? d ?
asked by Jia 
Physics
In a game of pool the cue ball strikes another ball of the same mass and initially at rest. After the collision the cue ball moves at 3.50 m/s along a line making an angle of 22 degrees with its original direction of motion. and the second ball had a speed
asked by Nat 
Chemistry
What do strong electrolytes, weak electrolytes, and nonelectrolytes have in common? Severl things, I am sure, but one that comes to mind is that all are composed of cations and anions. That may not fit into your situation, however.
asked by Dave 
math/statistics
Could anyone explaint to me what role the Binomial Theory plays in statistics and probability? Using statistics, we can make statements about a population based on sample data. Probability helps us make those statements. The binomial theory can be used to
asked by Jennie 
Chemistry
How does dissolving a solute affect the boiling point or freezing point of the solution? What about the solution's vapor pressure? Read about Raoult's Law, freezing point depression and boiling point elevation.
asked by John 
algebra
How do you divide and simplify this? squareroot of 162a/6a^3 Thanks sqrt[162a/(6a^3)] = sqrt (27/a^2) = (sqrt 27)/a
asked by Millie 
Calculus
Hi, I’d really appreciate if you can help me out with the following question: Nick bought a table for his basement. Unfortunately, he discovered that his table rocked back and forth on its four legs. After measuring the table legs and finding that they
asked by Ali Irfan Kurt