Monday

November 24, 2014

November 24, 2014

Total # Posts: 1,151

**ap chem**

calculate the enthalpy of formationof solid MgOH2, given the following data: 2Mg(s) + O2(g)-> 2MgO(s) heat:-1203.6 Mg OH2(s) -> MgO(s) +H2O(l) heat: 37.1 2H2(g)+ O2(g) -> 2H2O(l) heat: -571.7 what equation would they want the three equations to develop into and which ...
*October 4, 2007*

**Social Studies**

fill in the blank: giovanni Belzoni was a strongman and an blank who sent to egypt to recover the ancient statue of blanety blank
*October 4, 2007*

**PHYSICS**

thank you SO much, i got them all right in the first try! the answer to question c is "need more information"
*September 30, 2007*

**PHYSICS**

This is what i reasoned: a) if block is moving up the ramp, it means that tension is greater than the sin of mg. if T was half of mg, that means the speed decreases up the ramp because the T force is less. b) it would increase. i dont understand what the 30 deg has to do with ...
*September 30, 2007*

**PHYSICS**

A mass on a frictinless inclined ramp is connected to a rope with tension T. Complete the senteces with correct selection: -increases -decreases -stays the same a) If the block is moving up the ramp and theta=30 deg, its speed initally _________ if T=(mg)/2 b) If the block is ...
*September 30, 2007*

**Physics**

A Block weighing 72.2 N rests on a plane inclined at 20.0 deg. to the horizontal. The coefficients of static and kinetic friction are 0.22 and 0.12 resp. What is the minimum magnitude of F that will start the block moving up the plane? (I also got 9,74 N for this.. but wrong ...
*September 29, 2007*

**ap chem**

Under constant-volume conditions the heat of combustion of glucose is 15.57 kJ/g. A 2.500g sample of glucose is burned in a bomb calorimeter. The temperature of the calorimeter increses from 20.55 C to 23.25 C. What is the total heat capacity of the calorimeter? Which ...
*September 26, 2007*

**stats**

A soft drink vending machine is supposed to fill cups with pop. The cups hold exactly 8 oz of liquid. Suppose the actual amount dispensed by the machine follows a normal distribution with mean 7 oz. If it is found that exactly 4 percent of the cups overflow, what is the ...
*September 24, 2007*

**Statistics**

A soft drink vending machine is supposed to fill cups with pop. The cups hold exactly 8 oz of liquid. Suppose the actual amount dispensed by the machine follows a normal distribution with mean 7 oz. If it is found that exactly 4 percent of the cups overflow, what is the ...
*September 24, 2007*

**Chemistry**

An element consists of two isotopes of mass 36.4681 and 43.59612 amu. If the average atomic mass of the element is 40.741 amu, calculate the percent abundance of the first isotope.
*September 24, 2007*

**Chemistry**

calculate the wavelength of the second line in the Brackett series (nf=4) of the hydrogen emission spectrum. Rh= 2.180e-18 any help please? i know its energy levels 4 to 6... but that is all.
*September 24, 2007*

**Social Studies**

there's no continents in america?
*September 17, 2007*

**ap chem**

A certain volume of a .50 M solution contains 4.5g of a certain salt. What mass of the salt is present in the same volume of a 2.5 M solution? Indicate the concentration of each ion/molecule: A mixture of 50.0 mL of .2M KClO3 and 25.0 mL of a .20M Na2SO4. How would you answer ...
*September 13, 2007*

**psychology**

what are four subfields of psych?
*September 5, 2007*

**math**

2.089 in expanded form
*September 4, 2007*

**Projects**

Can somebody PLEASE tell me a lot of fun places to go to in Tennessee? I need to do a project about TN. Thank you!
*August 27, 2007*

**Project~Writing**

THANK YOU SOOO MUCH!!! But, I have heard from my teacher that you can't trust Wikipedia because ANYBODY can post something on there. But, THANKS ANYWAYS! :D
*August 24, 2007*

**Project~Writing**

How does a Table of Contents look like?
*August 24, 2007*

**PROJECTS**

Can you please give me images about how to make a timeline? Thank you for using the Jiskha Homework Help Forum. The following site has samples of timelines: http://www.teach-nology.com/web_tools/materials/timelines/ Thank you SO much!It really helped me! i have write abt ...
*August 20, 2007*

**translation**

hi, my name is lily and i need a site or someone very skilled and knowelged in the ancient language of latin to translate for me: the word "courage" and "honor" its very important to me that the exact meaning is put across, not a simple word substiute. ...
*July 31, 2007*

**Math**

Gasoline accounts for 85% of the motor fuel consumed in the United States every day. If 8,882 thousand barrels (bbl) of motor fuel is consumed each day, how much gasoline is consumed each day in the United States? Round to the nearest barrel. Would his be correct? 82%=82/100 ...
*May 27, 2007*

**science**

What are some examples of biotic and abiotic factors of an Eastern Bluebird? Biotic is living factors and abiotic is non-living factors. So, for a bluebird, sunlight (length of days effecting ovulation)availbility of water for drinking would be Abiotic factors. Food, nesting ...
*May 21, 2007*

**algebra**

can anyone tell me about polynomials please You need to be more specific in your question. Polynomials is just about half of a beginning algebra course.
*May 20, 2007*

**Dogs**

Do dogs eat rodents, fish, and rabbits? no. dogs do not eat any of those stuff. except maybe fish. Many dogs will eat anything they can get there jaws around. They aren't particularly picky. I won't tell you what mind get into. <G>
*May 8, 2007*

**inspirational poems**

Can you give me a website for inspirational poems please? http://www.businessballs.com/ifpoemrudyardkipling.htm Besides "If", see the list at the bottom of the page..."Do not stand at my grave and weep" is pretty strong. Thank you so much!!!!! I didn't ...
*May 7, 2007*

**chemistry**

where can i find printable worksheets from prentice hall for chemistry? I looked, but could not find any from PH online for any grade level. nor did I.
*May 7, 2007*

**random**

I dunno. Why don't u wait 4 a teacher 2 answer that? I guess any grade that can type and ask Qs. :p any grade.
*May 7, 2007*

**Table of Contents**

I seem silly asking this question but.... How does a table of contents look like? I forgot. Thank you for using the Jiskha Homework Help Forum. The Table of Contents in ANY book that you are familiar with, will give you an idea of the format. Also, here is an example: http://...
*May 6, 2007*

**Diorama**

I just thought that there are people always on this web 2 help. Now I know. *-* Lily, yes I am a teacher, and so are a number of others who help here. We are happy to help, but are not always here at the exact moment you are. Good luck with your project. Thankz anyways. Wat ...
*May 6, 2007*

**Social Studies**

What's a web for help with Ancient Egyptians' mummification process? Here are a couple of sites that will be of help. http://www.touregypt.net/magazine/mummificationinancientegypt.htm http://www.egyptologyonline.com/mummification.htm Thanks so much. Thanks to the ...
*May 6, 2007*

**alg2 (sequences)**

how do i find the pattern for: -4,8,-12,16 if the last number is negative, multiply by -1 then add 4 if the last number is positive, add 4, then multiply by -1 or how about termn+1 = (abs(termn))*(-1)^n, where term1 = -4, n>0 oops that last line should have said: termn+1...
*May 3, 2007*

**math**

Can someone please help me with these few problems here? Find the holes and points of discontinuity: 12x^4+10x-3 ----------- x-1 and 12x+24 ------ x^2+2x In the first, examine x=1 and in the second, examine x=-2. Look at the numerator also at that same point. Oh, I am so sorry...
*April 28, 2007*

**english (red sky at morning)**

what does the allusion "knees that launched a thousand ships" refer to? Here is the background of the original phrase: http://www.phrases.org.uk/meanings/359800.html What you quoted is alluding to this in some way. Helen of Troy, the most beautiful woman in history, ...
*April 25, 2007*

**Math**

Solve 2x-y+3z=8 x-6y-z=0 -6x+3y-9z=24 Did you notice that your third equation has the same normal as the third one? So visually I see two parallel planes intersected by third non-parallel plane, namely the second equation. So solve equations 1 and 2, and express them in ...
*April 21, 2007*

**biology**

please help me unscrample the following words: (the space means thate the anagram has two words in it, but the space is not necessarily at the space) rmns teizysecntiore nt roetssieitrsic id ksdxlne so derrecisgntdie Thank you very much for your time! -Lily ...
*March 19, 2007*

**egypt mummification**

the ancient eygptians stuffed their nastrilsith bees wax- sixth grader
*February 8, 2007*

**Declaration of Independence**

he served commander-in-chief of the continental army the american revolutionarywar
*January 23, 2007*

**ANYBODY HERE, I NEED HELP WITH ENGLISH HOMEWORK**

ENGLISH HOMEWORK: WHAT MEANS ABANDON? WHAT MEANS I ABANDON A BOOK? http://www.google.com/search?hl=en&lr=&defl=en&q=define:abandon&sa=X&oi=glossary_definition&ct=title
*December 24, 2006*

**Algebra**

Write a system of inequalities to express the exterior of the triangle ABD if A=(-2,7), B=(4,0), and C=(1,-3). Please help! gracias<3 Derive equations for the three lines connecting the three points. Then change the equations to inequalities to represent the region on the ...
*December 20, 2006*

**Math**

Simplify. (5x2 + 3x - 7) - (x2 - 7x + 4) Simplify. (5x^2 + 3x - 7) - (x^2 - 7x + 4) distribute - sign to get -x^2 +7x -4 put on top of one another and add 5x^2 + 3x - 7 -x^2 + 7x - 4 ------------- 4x^2 +10x -11
*December 16, 2006*

**Chemistry**

Given the following equation: SO2 + NO2 <--> SO3 + NO At 25 Celcius, 2.00 mol of each of SO2 and NO2 are introduced into a 1.0L sealed flask. When euilibrium is reached, it is found that [NO2] = 1.30 mol/L [SO3] = 1.30 mol/L -- Calculate the concentration at equilibrium ...
*November 8, 2006*

**acids and alkalis**

the only acids and alkalis i know is acid: batterys? acid rain lemon and orange alakalis: toothpaste mouthwash shampoo detergents and soap can someone plz help me to add more to my list? thnx if you do i rly need it for my upcoming science test and the more that i collect the ...
*November 4, 2006*

**math please HELP!!!**

please help!! what is 6 times the sum of 13 and a number? 6(13+ N)
*November 2, 2006*

**MATH - PLEASE HELP!**

Need help with combining like terms How do I figure this out... 11+5t^2+t+6t If anyone can help I would really appreciate it. I helped BELOW!!!LOL See the answer below which I posted as a correction to the answer provided by Margie and Dr Phil. The correct answer to this post ...
*November 2, 2006*

**math**

Can anyone help with combining like terms? The question - 11 + 5t^2 + t + 6t. I don't have a clue were to begin. Wouldn't it be toget all the T's together? Would 5t^ go with it also since it is an exponent? I think so I am not sure but I think it would be that.Let ...
*November 2, 2006*

**world geography**

ijusttook the exam and its all right got a 80
*November 1, 2006*

**word unscramble**

can u please unscramble this word:eehkossuy
*September 28, 2006*

**word unscramble**

tuythrhthtrj6jtr
*September 28, 2006*

**science**

Why is hydrogen, H, most often considered a nonmetallic element?
*September 22, 2006*

**Distributive property**

6 divided by 642
*September 20, 2006*

**chemistry**

If 100. g of iron at 100.0 C is placed in 200. g of water at 20.0 C in an insulated container, what will the temp, C, of the iron and the water ( C value is 4.18) when both are at the same temp? The specific heat of iron is 0.444 KJ/Kg C ---- steps would be appreciated... ...
*September 15, 2006*

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