Friday

May 22, 2015

May 22, 2015

Total # Posts: 1,782

**AP CHEMISTRY**

If a Li 2+ ion, initially in the 2nd excited state absorbs a photon of light with a fequency of 2.82 X 10^6 GHz, what will be the final energy level for this electron? Show all stepts to get final energy level. i have no clue what this question is even asking :[?
*November 7, 2007*

**CHEMISTRY**

If a Li 2+ ion, initially in the 2nd excited state absorbs a photon of light with a fequency of 2.82 X 10^6 GHz, what will be the final energy level for this electron? Show all stepts to get final energy level. i have no clue what this question is even asking :[?
*November 7, 2007*

**Algebra 2**

Yeah i meant -x^4
*November 6, 2007*

**Algebra 2**

I know how to graph points but I need the points to this equation. f(x)=(-x)^4+4x^2-2x solve by making a table of values. It says I also need the coordinates at which the relative maxima and minima occur.
*November 6, 2007*

**Chemistry**

Part 2 Secure the stand and two clean burets. Using the funnel, fill one buret to the 0 mark with HCl. Rinse out the funnel thoroughly and carefully fill the other buret to the 0 mark with 2 M NaOH solution. Drain 25 mL of NaOH solution into the calorimeter. Record the mass of...
*October 24, 2007*

**Chemistry**

Begin by measuring the mass of the empty calorimeter and record the value. Next, add approximately 1-1.5 g of solid NaOH pellets and record the mass. Carefully grind up the pellets using a mortar and pestle. Then, transfer the ground up NaOH into the calorimeter and measure ...
*October 24, 2007*

**Chemistry**

What improvements could i make to this lab? so far i only have that the graduated cylinder should be changed to a buret for a more accurate measurement. Procedure: Part 1 Begin by measuring the mass of the empty calorimeter and record the value. Next, add approximately 1-1.5 g...
*October 24, 2007*

**Algebra 2 -math**

When you cry over spilt milk
*October 24, 2007*

**physics**

Mere and Ruth investigated the relationship between the applied force, F, and the extension, x of a spring. The results they obtained are shown in the table below. Force, F (N) Extension, x (m) 0.0 0.0 2.0 0.033 4.0 0.066 6.0 0.099 8.0 0.132 10.0 0.165 Draw a graph of force ...
*October 17, 2007*

**Physics**

Mere and Ruth investigated the relationship between the applied force, F, and the extension, x of a spring. The results they obtained are shown in the table below. Force F (N) Extension x (M) 0.0 0.0 2.0 0.033 4.0 0.066 6.0 0.099 8.0 0.132 10.0 0.165 state the type of ...
*October 17, 2007*

**problem stats**

an instant lottery game gives you probability .02 of winning on any one play. Plays are indpendent of each other. If you play 5 times, what is the probability that you win at least once.
*October 15, 2007*

**ap algebra**

Please help me with this problem. I dont know what to do. Use the graph or table to determine a solution of the equation. Use synthetic division to verify that this number is a solution of the equation. Then solve the polynomial equation. x3 + 6x2 + 11x + 6 = 0
*October 15, 2007*

**problem stats**

an instant lottery game gives you probability .02 of winning on any one play. Plays are indpendent of each other. If you play 5 times, what is the probability that you win at least once.
*October 15, 2007*

**chemistry**

what is the trend in bond length for o-h (.96A), s-h (1.341A) and n-h (1.005A). Explain the trend- do the calculated bond distances match the expected trend?
*October 11, 2007*

**biology**

found by me on some website: 'five basic things to survive; food, water, fuel (for cooking and heating), clothing, and shelter. ' Lol i'd never said that it was fuel....
*October 8, 2007*

**English**

OMG i've made a mistake while typing: The question should be: The Beatles recorded together until 1970.
*October 8, 2007*

**English**

Hi there. I'm from Poland and I'm studying English. I need some help with a True/False exercise. There's a piece of text and there's a question below it and you need to answer it with true or false. My query is especially aimed at English Teacher's and ...
*October 8, 2007*

**AP CHEMISTRY**

Could you please look over my work and see if I did this correctly? Thanks When 3.200 g of liquid ethyl alcohol (C2H5OH) is burned in a bomb calorimeter containing 3.500 kg of water, the temp rises from 22.84 degrees C to 28.36 degrees C. The calorimeter constant is 25550 J/ ...
*October 7, 2007*

**CHEM**

Could you please look over my work and see if I did this correctly? Thanks When 3.200 g of liquid ethyl alcohol (C2H5OH) is burned in a bomb calorimeter containing 3.500 kg of water, the temp rises from 22.84 degrees C to 28.36 degrees C. The calorimeter constant is 25550 J/ ...
*October 7, 2007*

**MATH**

HOW MANY FOUR-LETTER CODE WORDS CAN BR FORMED USING A STANDARD 26-LETTER ALPHABET IF REPETITION IS ALLOWED IF REPETITION IS NOT ALLOWED
*October 4, 2007*

**MATH**

HOW MANY DIFFERENT ARRANGEMENTS ARE THERE OF THE LETTERS IN TESTERS?
*October 4, 2007*

**algebra**

can someone tell me if this problem is correct: Determine whether each of the following trinomials is perfect square. If it is factor the trinomial: x^2-24x+48 =(-24)^2-4(48)
*October 2, 2007*

**biology**

can you provide an explanation on how a "muscle tone" reflex happens?
*October 1, 2007*

**biology**

can you provide a simple explanation of how a cell fires or synapses
*October 1, 2007*

**Science (big idea of energy)**

Well when magnesium burns it makes a realy big flsh which can realy hurt your eyes if you look at it
*October 1, 2007*

**algebra question**

the sum of two numbers is 240 the larger number is 6 less than twice the smaller. what are the two number.
*October 1, 2007*

**AP CHEMISTRY**

A 2.75 g sample of the hydrocarbon acetone, CH3COCH3, is burned in a bomb calorimeter with 975 mL of water, initially at 23.50 degrees celsius. The bomb is constructed of 285.0 g of nickel metal having a specific heat capacity of Cp = 0.826 J/ g degrees C. The final ...
*September 30, 2007*

**Psychology**

Well there's serotonin, acetylcholine, norepinephrine and dopamine... An excess of dopamine is usually associated with schizophrenia. Serotonin and norepinephrine can be associated with depression. Norepinephrine is prevalent in the sympathetic nervous system, and when ...
*September 30, 2007*

**AP Chemistry**

A 2.75 g sample of the hydrocarbon acetone, CH3COCH3, is burned in a bomb calorimeter with 975 mL of water, initially at 23.50 degrees celsius. The bomb is constructed of 285.0 g of nickel metal having a specific heat capacity of Cp = 0.826 J/ g degrees C. The final ...
*September 30, 2007*

**Chemistry**

A 2.75 g sample of the hydrocarbon acetone, CH3COCH3, is burned in a bomb calorimeter with 975 mL of water, initially at 23.50 degrees celsius. The bomb is constructed of 285.0 g of nickel metal having a specific heat capacity of Cp = 0.826 J/ g degrees C. The final ...
*September 30, 2007*

**Chemistry**

A 2.75 g sample of the hydrocarbon acetone, CH3COCH3, is burned in a bomb calorimeter with 975 mL of water, initially at 23.50 degrees celsius. The bomb is constructed of 285.0 g of nickel metal having a specific heat capacity of Cp = 0.826 J/ g degrees C. The final ...
*September 30, 2007*

**World Literature**

For an essay, I'm using the quote “One Ring to rule them all, One Ring to find them, One Ring to bring them all and in the darkness bind them” (The Fellowship of the Ring, page#). I'm not sure what to put for the page number because the quote is in the very ...
*September 20, 2007*

**algebra**

thanks
*September 19, 2007*

**algebra**

Help!!! I need help finding the slope of the line passing through the points (-3,3) and (-3,-3).
*September 19, 2007*

**maths**

cars driven on the road must have a current warrant of fitness and be registered. A recent newspaper article contained the following statement : 80% of cars on the road in new zealand have a currengt warrant of fitness and 90% are currently registed." In peak hour traffic...
*August 26, 2007*

**maths**

the police officer also gathered data on the speedsx, in kilometers per hour (km/h) of some cars as they drove down the hill towards her car. the speed limit is 50 km/h. Analysis of the results showed that the speeds of cars were normally distributed with a mean speed of 56 km...
*August 26, 2007*

**Maths**

A police officer gathered data on the speeds, in kilometres per hour (km/h), of some cars as they drove down hill towards her car. The speed limit is 50 km/h. Analysis of the results showed that the speeds of the cars were normally distributed with a mean speed of 56 km/h and ...
*August 23, 2007*

**Maths**

"slow drivers" contribute to road rage problems and the police officer noticed that 2 of the 150 drivers in her survey caused problems for other drivers because of their slow speed. Use normal distribution and this information to describe a "slow" driver in...
*August 22, 2007*

**Maths**

We have to design a way of simulating the situation. Cars driven on the road must have a current warrant of fitness and be registed. A recent newspaper article contained the following statement: " 80% of cars on the road in New Zealand have a current warrant of fitness ...
*August 22, 2007*

**Biology**

I need to know how caffiene intake effects urine output, obviously urine output will decrease, but by how much? If 2000 ml of water was ingested, how much urine would be produced? If 2000 ml of coffee was ingestedhow much urine would be produced? Thank you for using the Jishka...
*June 5, 2007*

**Final Exam- Honors Physical Science**

how can you determine the number of protons, electrons,neutrons, atomic number, and the atomic mass of an element using the periodic table? Atomic mass is given in the table, as well as the atomic number and atomic mass number. Atomic number is the number of protons, which is ...
*June 4, 2007*

**DOL**

Is this sentence correct? Adriana and I liked the book called Stone Fox, too. Yes. Your sentence is correct. Be sure to underline Stone Fox when you write it. Thank you so much. Yes I do have it underlined!!!
*May 23, 2007*

**math**

List all possible rational zeros of... h(x)= 2x to the (4th power) - 5x (to the third power) + 3x (to the 2nd power) + 4x - 6 Use the Rational Roots Theorem. Any root of the form p/q with p and q relatively prime must be such that p divides 6 and q divides 2. You then find the...
*May 21, 2007*

**Math**

The area of a regular pentagon with a perimeter of 35 units. Join the centre to each vertex to form 5 eq Join the centre to each vertex to form 5 equal triangles. Consider one of those triangles the central angle is 72º and each of the other two equal angles is 54º, ...
*April 29, 2007*

**trig question**

Compute inverse functions to four significant digits. cos^2x=3-5cosx cos^2x + 5cosx -3=0 now you have a quadratic, solve for cos x using the equation cosx=(-5 -+ sqrt (25 +12)/2 the back of the book says .9987+2kpi and -.09987+2kpi when i do it i dont get that answer. I get it...
*April 16, 2007*

**Trig**

solve to four decimal places 1.3224sinx + 0.4732=0 :for all real x values solve for sinx, then arcsinx. solve for sinx, then arcsinx. so its sinx= -.4732/1.3224 and i get -.36594 but how do you get the other values for a real x Ok, use your calculator. Sinx is negative in the ...
*April 16, 2007*

**Trig**

solve to four decimals places 5.0118 sinx - 3.1105=0 :for all real x values I will be happy to critique your work. Solve for sinx, then arcsinx
*April 16, 2007*

**Trig**

Compute inverse functions to four significant digits. cos^2x=3-5cosx rewrite it as.. cos^2x + 5cosx -3=0 now you have a quadratic, solve for cos x using the equation cosx=(-5 -+ sqrt (25 +12)/2
*April 16, 2007*

**Physics - Pendulums**

The problem lies in the intertia equation. You found the intertia of a disk around its center, not around its rim, as the problem calls for. The equation for inertia should be: I = 0.5mr^2 + mr^2 Therefore the coefficient when you solve should be 1.5 and not 0.5. Marianne was ...
*April 12, 2007*

**Algebra II**

State the vertex of the graph: y=2x-6x+9 ...the 2x is squared. y = 2x^2 -6x + 9 The vertex is where the function is a minimum. That would be where dy/dx = 4x -6 = 0 x= 3/2 If you are not familiar with calculus, then rewrite the expression y = 2 (x^2 -3x + (3/2)^2) +9 -(3/2)^2...
*March 29, 2007*

**animals**

What was the first bird domesticated by man? Wasnt it the goose. But I dont know if I am right http://www.google.com/search?as_q=&hl=en&num=10&btnG=Google+Search&as_epq=the+first+domesticated+bird&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=any&...
*March 28, 2007*

**science**

is amaryllis flower asexualy, sexually or both? see below
*March 18, 2007*

**science**

is amaryllis asexualy, sexually or both? Both. http://edis.ifas.ufl.edu/EP060
*March 18, 2007*

**science**

how do u calulate the percentage composition of NO2 and mgcl2 You don't. There is no NO2 in MgCl2 which should be obvious.
*March 17, 2007*

**chemistry**

strontium chloride can be obtained as the anhydrous salt, SrCl2, and as the hydrates SrCl2.2H20, and SrCl2.6H20. (ArSr = 87.5). 0.323 g of a sample of strontium chloride is dissolved in water and reacted with sliver nitrate solution. The mass of sliver chloride precipitates is...
*March 17, 2007*

**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
*March 6, 2007*

**major math**

which numbers are four units from -1? 3, -5 are both four units away on the real number line.Donna E. Shalala
*March 6, 2007*

**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): <--- -5 --- -4 --- -3 --- -2 --- -1 --- 0 --- 1 --- 2 --- 3 --- 4 --- 5 ---> Can you determine which numbers (both negative and positive) could be 4 units from...
*March 6, 2007*

**math**

56%, what would the fraction and decimal be 56/100= 23/50 .56 is a neat fraction. What does it mean? How many hundredths is .56?
*March 5, 2007*

**math**

56% what would thefraction and decimal be 56% = 56/100 (which can be simplified by dividing both numerator and denominator by 4). Take your best guess for the decimal equivalent. We'll tell you if you got it right.
*March 5, 2007*

**physics-circular motion**

the turntable of a record player rotates at a rate of 11 1/3. A record with a radius of 15cm is being played. a punk kid throws a piece of gum that lands right on the edge of the record. What linear distance in meters does the gum travel if it stays on the record for 10 ...
*March 4, 2007*

**History**

What did John Lennon fear? http://thinkexist.com/quotation/it-s-fear-of-the-unknown-the-unknown-is-what-it/347275.html
*February 13, 2007*

**History**

Did John Lennon have any brothers or sisters http://en.wikipedia.org/wiki/John_Lennon#Early_years:_1940-1957 =)
*February 12, 2007*

**Geography.**

What kind of careers can a person with a background in geography have? Plz help. Writing a paper for it. Thanks. These sites have information about careers in geography. Look at the bottom of the page in the first site. http://www.aag.org/Careers/career_search.cfm http://...
*February 10, 2007*

**Question**

Where are the rest stops/gas stations located along the highway? Why? Plz help, asap. Thanks so much. next to overpasses of different interstates/highways/roads (that's why gas stations are mostly on the corner of 4 way intersection in towns and such..) because it's ...
*February 6, 2007*

**Geography**

1.Name the Canadian ports that are opened all year round. 2.Which Canadian city is the eastern most provincial capital? Plz help. THANKS. http://www.acpa-ports.net/industry/cpafacts.html http://www.travelsense.org/destinations/canadacruise.asp Read carefully! =)
*February 5, 2007*

**math**

What is the difference between joining the points in a graph and drawing a smooth curve near them? Those values that haven't actually been measured can be estimated by using a smooth curve versus connecting the points on a graph.
*January 17, 2007*

**college application short response**

Thank you for anyone that helps me about my college application. (Thank you for your suggestions, Writeacher, I re-writed my paragraph.) In the space provided below, please describe which of these activities has had the most meaning for you, and why. I was elected as the ...
*January 13, 2007*

**college application short response**

I wish you could help me the short answer of my college application essay. Many thanks Question: Please briefly elaborate on one of your activities. I was elected as the President of the class of 2007 in high school. My job of being a President was to supervise students ...
*January 13, 2007*

**College Essay**

Is any one can help me to revise my college application? Thank you. Question: Please describe which of these activities ( extracurricular or personal activities or work experience) has had the most meaning for you, and why. I was used to be a President of class in high school...
*January 8, 2007*

**Where can I find a site to translate German?**

Where can I find a place to translate German? Search on google or here under foreign languages click german. Here is one translation website, but be careful -- machine translators are often inaccurate. http://babelfish.altavista.com/ =) Thank you for using the Jiskha Homework ...
*December 18, 2006*

**s.s**

a center for the study of navigation, shipbuilding, mapmaking, and sailing was established by________? The Royal Navy is one answer that comes to mind.
*December 10, 2006*

**the big idea of energy**

Im doing homework on burning magnesium, so mp something simular to everyone else but heres some help:- the big of idea is like the particles reacting like magnesium and oxygen to form magnesium oxide, so the particles of both reactants (magnesium & oxygen) have collided to ...
*December 5, 2006*

**ENGLISH**

Hello, what is the format of "affiliation" in a lab report? A lab report? Are you sure this isn't a science assignment?? http://www.google.com/search?hl=en&q=affiliation+lab+report&btnG=Google+Search ??
*December 5, 2006*

**history**

who is juan ponce de leon grave do you mean juan ponce de loen Yes...
*November 28, 2006*

**science**

What is it in sherry cooking wine that makes it less effective in killing bacteria when it has a pH of 3.5, compared to a tomato, with a pH of 3.7. The bacteria is Serratia marcescens. I have been searching for the chemical compositions of both to compare and all I found was ...
*November 27, 2006*

**A proof question**

Suppose 32 = alpha*beta for alpha, beta reatively prime quadratic integers in Q[i] . Show that alpha = epsilon*gamma^2 for some unit epsilon and some quadratic integers gamma in Q[i]. If you know how , please do teach me . Thank you .
*November 15, 2006*

**A number thoery question**

Please help me! Thank you very much. Prove Fermat's Last theorem for n=3 : X^3 + Y^3 = Z^3 where X, Y, Z are rational integers, then X, Y, or Z is 0. Hint: * Show that if X^3 + Y^3 = Epsilon* Z^3, where X, Y, Z are quadratic integers in Q[sqrt(-3)], and epsilon is a unit ...
*November 15, 2006*

**science**

wax burning of a candle is actually a physical reaction/change not a chemical reaction/change
*October 20, 2006*

**End behavior models**

what are the left and right end behavior models of arctan(x)?
*October 20, 2006*

**science**

I am having trouble with independent and dependent variables. Here is a problem from my home work. Krusty Krabs Breath Mints: mr. K created a secret ingredient for a breath mint that he thinks will cure bad breath people get from eating his crabby patties. he asked a 100 ...
*September 6, 2006*

**mathmatics**

what is 2 plus 2? In base three, it is 11. Math has some amazing ironies, if you know it. Not knowing it is rather stifling. square root of 145 factor of 25 28 40 42 48 4
*July 20, 2005*