Questions Asked on
February 7, 2007

chemistry
how many molecules are present in 4.25 mol if CCl4? 1 mol = 6.022 x 10^23 molecules Therefore, how many molecules are in 4 moles? I don't have a calculator to figure out that problem, but I do understand it. i mn
asked by larry 
Joint variation
A variable 'f' varies jointly as 'g' and the square of 'h' and inversely as 'j'. If f=14 when g=5, h=8, j=20, what is 'f' when g=4, h=6 and j=9? Thanks. F=Constant*gh/j Use the data for determine the constant. Then, use the second set of data to determine
asked by Jen 
Chemistry
How much Ca(NO3)2 should be weighed out to have 0.650? To have 0.650 what of what. Do you want 0.650 g Ca?
asked by Bob 
math check please
1.Write 4x4x4x4x4 as a power of 4. Answer: 4^5 2. Evaluate. 72 divide 89 divide 3 Answer: 0 3. Give the place value for the indicated digit 8 in the number 138,350 Answer: Thousands 4. Fencing a rectangular field that measures 37 ft by 27 ft How much
asked by tara 
chemistry
Is C7h16 + O2 = 7 CO2 + 8 H2O a balance chemical equation? C balances. H balances (you should capitalize it). O is not balanced. You need a coefficient of 11 for O2. Check that.
asked by larry 
Science
COMPOUND 1 CH2=CHCHOH ________ _______CH3 COMPOUND 2 _____________O ____________// CH3CHCH2C ___________\ ____CH3______OH *Now, I must: Identify any functional groups in these compounds and name them. The functional group in 1 is the OH which makes
asked by Shane 
Sociology
Okay... here's the assignment. I've been trying this for a week and I'm screwed. Spend 30 minutes on each of these sites and answer the following questions in a 35 page paper, APA style. pchrgaza (dot) ps memri (dot) org/archives (dot) html In this
asked by Marie 
science
how is grass better than people grass is better than people because we need the grass to survive. The grass gives off oxygen allowing us to breathe.
asked by brian 
mathmatics probability
I am having with the following questions and was wondering if someone might be able to show me a step by step solution to arrive at the answer. They are from Probablity and Statistics for Enginnering and the Sciences by Jay Devore 6th Edition 62) An
asked by ajones51 
Quadratic Equations
Ok, I am supposed to find out what the variables are by factoring and finding square roots. I couldn't find the right factors of a and c that added up to b in the equation (did that make sense?). Please help me find them! TYVM 5n+6n^24=0
asked by Emily 
chemistry
hi, Can you please double check to see if i have got this right? Is the empirical formual for oxide of arsenic As2O5? Cheers ;) Arsenic forms two oxides with oxygen. One is As2O5, the other is As2O3. I'm glad you posted today; please tell your friend you
asked by bertie 
Chemistry
I have this question in front of me concerning Methanol (CH3OH) & how geseous methanol is formed via the following thermochemical equation: CO(g)+2H2(g)¡êCH3OH(g)∆H=90kJ . Now, it asks me (explanations should show a clear understanding of how Le
asked by Travis 
halflife
1. The halflife of a firstorder reaction is 9.89 minutes. How many minutes will have elapsed after 27 halflives? My answer is 267.03. 2. The halflife of a secondorder reaction is 2.508 days. How many days will have elapsed after 8 halflives? My
asked by Issac 
photometry
which type of binary can have their sizes measured directly by photometry
asked by bolometric 
m type star
what is the typical main sequence lifetime of a Mtype star? Thank you for using the Jiskha Homework Help Forum. Here is a nice site for astronomy: http://www.astronomynotes.com/starprop/s14.htm
asked by bolometric 
Chemistry
What is the empirical distinction between emission and absorption spectra? In general terms, how did Niels Bohr explain each of these spectra? In general terms, emission spectra are obtained when the electron is at a high energy level and it falls to a
asked by Raj 
chemistry
Can someone define the mole concept? The mole is a number. A dozen eggs is 12 eggs. A gross of anything, pencils for example, is 144. A ream, of paper for example, is 500 sheets. A mole of anything is 6.02 x 10^23 of those anythings.
asked by larry 
math
how do you do fractionation? huh??/ What grade are u in?
asked by Nikki 
Math for Chem Lab
There are two ways in which you can obtain results from a completed graph. One is by interpolation and the other is by extrapolation. What is the difference between these two terms and which one do you believe may lead to erroneous conclusions and why? My
asked by Marisol 
science
how many helium atoms must undergo fusion at 100 million K in the helium flash?
asked by bolometric 
question
My question is inregards to why is it that all of my questions that i've posted up here in this website and the answers that i've received show up when i search on the internet. For example if i go to the website askjeeves and type in religion my name
asked by Kailin 
Science
List ways simple plants affect your life each day. (HINT: Where do electricity and heat for homes come from?) food, heat and electricity(from fossils and coal and oil), cars (gasoline from oil), etc.
asked by Jessica 
Please Check My Math Work
a^2  2ab  15b^2 This is what I got: (a5b)(a+3b) Correct! x^4+2x^34x^25x6 DIVIDED BY x^2+x2 My answer: x^2+x3 remainder of 12\x^2+x2
asked by Margie 
debating on
is human better than grass (opposed) Grass is better because without it we would be dead right now! The grass gives us oxygen to breathe! GRASS MUCH BETTR
asked by tas 
nutrition
what are features of artificial sweeteners? what are general features of sugar alcohols? do they promote high or low glycemic index, constipation, dental caries or fewer GI side effects then alternative sweeteners?
asked by susan 
More Math To Check Please
4c^2  12c + 9 This is what I got: (2c+3)(2c3) *Is that correct.? No, it is (2c3)^2.
asked by Margie 
????Math Question????8th grade adv.math
Algebra! How is the distance formula and the pythagorean theroem similar? The distance formula follows from the pythagorean theorem. You have to apply it twice: If (x1, y1, z1) are the coordinates of a point 1 and (x2, y2, z2) are the coordinates of point
asked by Alex 
Please Check This 2!
p^41=(p^2)(p^2+1) Typo? p^41=(p^21)(p^2+1)
asked by Margie 
math
I suggest you Google each of these people. You can search for the name bio Or you can search for the name height weight. for math i have to do a graph of some sort, so i chose to do a graph of famous ppls heights and weights, so i was wondering do you know
asked by Ms. Sue 
Mathematics
I have this question on tesselations, I got some homework and one of the questions are: A tesselation with the notation of schlafli of {3,3,4,4}. What formes are at the vertex. Draw a tesselation of it. I have been trying to figure this out for 30mins now
asked by Stine 
English
Can someone help me with this poem? "From the Dark Tower" by Countee Cullen. I don't know what "dark tower" refers to. http://www.english.uiuc.edu/maps/poets/a_f/cullen/darktower.htm =)
asked by Lisa 
Economics
The task of my assignment was to calculate the Nominal GDP, given the GDP deflator and the Real GDP. This is what I got. GDP Deflator Real GDP Nominal GDP 0.9 600 540 1.0 600 600 1.1 600 660 The second part of the question asks what is happening in terms
asked by Freddy 
Chem
What is the volume of 0.10mole of a gas at STP 1 mol occupies 22.4 L at STP. so .10 of a mole would be 2.24L of a mole of gas. How can I construct a cube that has that same volume. Right. 2.24L is 2.24 x 1000 cc/L = 2,240 cc = 2,240 cubic centimeters. You
asked by ezzy 
Physics
in the equation w= fd it is assumed that the force varies and is exerted in the direction of displacement... true or false? Yes. Force is measured in the direction of displacement.
asked by Shelley 
Euro History  Politics
What was the political structure of Europe like during Age of Metternich and the Age of Realpolitik? Similarities, differences. How did it effect Europe? These sites will help you answer this question. http://en.wikipedia.org/wiki/Realpolitik
asked by Jim 
Physics
1.There are four charges, each with a magnitude of 2.5 µC. Two are positive and two are negative. The charges are fixed to the corners of a 0.29 m square, one to a corner, in such a way that the net force on any charge is directed toward the center of the
asked by Todd 
diversity
This is a group with distinct national origins or cultural patterns. For example, Norwegian Americans belong to this type of group. Thank you for using the Jiskha Homework Help Forum. Do you mean "ethnic groups?"
asked by Robert 
electricity
Is there any data about the use of nichrome heating, for instance: a nichrome element in the cables of electric kettles, geysers and spiral stove? What do you mean by "data"? What physical data are you looking for: resistivity?
asked by tigger needs help 
Science help
A drop of oil volume 0.05cm^3 is released from a medicine dropper on to a calm surface of a pond where it spreads out to cover an area of 40cm^2. Assume that the oil film has a uniform thickness equal to the diameter of an oil molecule. I see there is an
asked by Lucy 
Science
What is the structural formulae for the equation for the hydrolysis of lactose?
asked by Samantha 
biology
How can an understanding of the "mortality factor" lead to a successful biological control of pests in agriculture & horticulture? Check these sites.
asked by Ryan 
erosion
Explain why erosion is less of a problem in the west than the east Erosion by water is less in the west, because there is less rain. In the west, erosion by wind is greater, however, wind erosion is very small when compared to water erosion.
asked by oliver 
SCIENCE  Pls HELP
A proton (with a mass, mp = 1.673 x 10^27 kg & electrical charge, e = 1.602 x 10^19) and an electron (with a mass, me = 9.109 x 10^31 kg & electric charge e = 1.602 x 10^19) are not moving & at a distance of 1.000 x 10^10 m apart.... (assuming the
asked by OLIVIA 
science
I know that every element has only a certain set of allowed energy states & that the exact energy of these states depends upon the number of electrons, but why is the colour of the light emitted by an element (in GASEOUS STATE) characteristic of the
asked by duncan 
The rubaiyat
Take one of the verses from "The Rubáiyát" and rewrite it in modern, informal English. Your verses should have a title and be four lines long, written in iambic pentameter, in AABA. The verse I'm using is: "Some for the glories of this world; and some
asked by Claire 
Generalization essay
"In this exercise you'll write an essay supporting a generalization you've stated about some topic." Any ideas for generalizations? I have to list 5 and use one. A generic generalization is the most common type. All dogs bite. Here is a good definition.
asked by Claire 
geography
how big did the rainforests start out to be at the begining of time? At the beginning of time, there were no forests, only microorganisms. For information about the evolution of rainforests, check this site. http://www.esd.ornl.gov/projects/qen/rainfo.html
asked by cantsay 
math
If you add twothirds of a number to the number itself, you get 40. What is the number? I do not know how to set it up? 2/3n + n = 40 Solve for n. I don't know but thak you sooooooooooo much for helping me on my mixed #'s!!!!!!!! Good Luck!!!!!! I don't
asked by catalina 
CHEMISTRY
Given assumed valencies: H=1, N=3, & C=4 i am now required to draw the structural formulae of HYDROGEN CYANIDE and CYANOGEN. H:C:::N is the Lewis electron dot structure. If you want to use "sticks" as a bond instead of two electrons, one stick stands for
asked by MARK 
SCIENCE
What type of bonding holds the compound, sodium cyanide, together? The CN bond is covalent. The Na to CN bond is, in most minds, an ionic bond. The electronegativity of C is about 2.1 and that of Na is about 1; therefore, with a difference of about 1 it is
asked by MARK 
Biology
What is the structural formulae for the equation for the hydrolysis of lactose?
asked by Samantha 
Science
In no more than three sentences I must state the "Hubble relationship" in words AND quantify numerically what it says about the "speed of recession" of distant galaxies (i am to include a definition of the "unit one parsec" in this 3sentence answer)  CAN
asked by Anonymous 
biog
When Was Oprah Winfrey Born? Look her up here: http://www.biography.com =)
asked by Kierra 
Inverse variation
A variable 'm' varies directly as 'a' and inversely as 'b'. If m=6 when a=7 and b=4, what is 'm' when a=9 and b=12? M= constant*a/b Find the constant from the first set of data, then, using that, find m in the second set.
asked by Jen 
Art & the Bible.
I need to write a short essay about the Bible's influence on an artist. Listed are Michelangelo, da Vinci, Durer, Rembrandt, Rubens, El Greco, and Pippin. I've searched with google, encarta, and through some others and I can't find a website that tells me
asked by Claire 
ethics
She is a very capable black woman. How would I make this nonracist and nonagist? She is a very capable person.
asked by kim 
Solving rational inequalities
problem #1 (1+x)/(2x+3) 2 graphically TIA please ignore this
asked by Jen 
Economic
All of the following refer to the Economy of Ecoland:  GDP in 1990 is $1000  Annual inflation is 5% per year from 1991  1995. From 1996  1999, inflation is 10% per year  Real GDP grows at 2% every year a) Calculate real GDP from 1990 to 1999 b)
asked by Freddy 
World Studies
True or False. A democratic form of government is one in which a president holds the most power. http://www.answers.com/democracy Read carefully. =)
asked by Emily 
World Studies
What are some important things that can be found in Washington D.C.? http://www.fodors.com/miniguides/mgresults.cfm?destination=washington_dc@167&cur_section=sig&sort=category&review=brief&pg=14 White House Capitol Building Library of Congress Supreme
asked by Emily 
math
1 1/2 * 3 1/5 = 1 1/2 = 3/2 3 1/5 = 16/5 Multiply numerator and denominator to arrive at the answer. Be sure and reduce the fraction if possible. Please help Angelina!!!!!!!!!! With Math.
asked by laura 
solving rational inequalities
1/(1+x^2) < 1/2 TIA
asked by Jen 
Math,correction
direction state : solve each system by addition. if a unique solution does not exist, state whether the system is consistent or dependent. NOw the problem looks like this: 2x+3y=1 5x+3y=16 the answer that I got was this: for variable x = 5 y = 3 which is
asked by jasmine20 
Math
How would i go about finding the x and y intercepts of this eqaution? f(x)=3x/4x+2
asked by Mant 
research paper
I need an attention graber to start my paper off. It's on global warming and its effects on the environment. Any help? Here are some blog posts that might give you some ideas: http://www.bloghouston.net/item/4766
asked by sam 
chemistry
Consider the equilibrium, A + B C, with K=32.217 and initial concentrations of A,B, and C, of 3.665M, 0.883M, and 3.925M, respectively. What is the equilibrium concentration of B 3.665 0.883 3.925 A + B = C Keq=(C)/(A)*(B)= 32.217 Q =
asked by Rob 
PreCalc
How do I solve this? My work has led me to a dead end. tan(45x) + cot(45x) =4 my work: (tan45  tanx)/(1+ tan45tanx) + (cot45  cotx)/(1 + cot45cotx) = 4 (1tanx)/(1+tanx) + (1cotx)/(1+cotx) = 4 Then I found a common denominator, giving me this:
asked by Jess 
math
what does / mean in this equation =(7+45)/2 Divided by. "The quantity 7 + 45 (which would be 52) divided by 2"
asked by victoria 
please check my math
2/3 + 1/5= 13/15. Is that right or can it be Reduced? You're good to go. That is correct... and 2nd question: It can't be reduced.... Good Job!
asked by Angelina 
precalc
Solve: cos(2x180)  sin(x90)=0 my work: cos2xcos180 + sin2xsin180= sinxcos90  sin90cosx cos2x  sin2x= cosx cos^2x + sin^2x 2sinxcosx=cosx I'm stuck here. I tried subtracting cosx from both sides and making sin^2x into 1 cos^2x, but I still can't
asked by Jess 
DrBob222
On Monday you helped me to understand and answer the one question, but I am not too sure if they want all the calculations that you answered... regretably, I am still a bit lost with these! Below is the question as it is printed: The isotope caesium137,
asked by Mary 
literature
Can you please help me make new words from the following: views, player, remote, exits, lacees and newer. I had fifty and just can't figure these out. Thank You...........Destiny 5th grade See answer above  same question posted by Anonymous! =)
asked by Destiny 
science
how do i calculate the mols of sulfuric acid ? mols = grams/molar mass
asked by Deon 
literature
Please provide me with other words using the following: views, player, remote, exits, laces and newer. Thank You. To find synonyms for any word, you need to use a thesaurus: http://www.thesaurus.com http://www.answers.com (Scroll down a bit to find the
asked by Anonymous 
Calculus/College Algebra
I'm so lost. We're working on limits for this assignment and I get that, but my difficulty lies in breaking down the original problem. The problem is: Find the limit: lim (x>5) The numerator is (the square root of 9x) 2 and the denominator is x(the
asked by Amy 
Science
What's the number of stage micrometer units in 10 ocular units using 4x, 10x, and 43x objectives ?
asked by Tay 
Precal
how to express 3+4i in polar form
asked by Icon44 
chemistry
105 grams of MgCl2 contains how many mols of MGCl2? mols = grams/molar mass Better get your calculator.
asked by larry