Questions Asked on February 5, 2007

Use the Substitution method to solve the system of equations.y - 2x = -5 3y - x = 5 Solve one of the equations for x or y. Let's
1. 5 answers
2. asked by Margie
3. 5,159 views
Location A is 3.00 m to the right of a point charge q. Location B lies on the same line and is 4.70 m to the right of the
1. 2 answers
2. asked by Anna
3. 5,108 views
How many representative particles are in 2.5 mol H2O2?each mole consists of 6.02*10^23 things. Memorize that.
1. 3 answers
2. asked by Dennis
3. 3,947 views
What is the slope of a line through(-5,2) and (6,7) in the standard(x,y) coordinate plane? Sorry, I forgot the choices F.9 G.5
1. 2 answers
2. asked by bailey
3. 2,349 views
A railroad flatcar of weight W can roll without friction along astraight horizontal track. Initially, a man of weight w is
1. 1 answer
2. asked by Tammy
3. 2,143 views
are these endothermic or exothermic?2H2O2 (l) �¨ 2H2O(l) + O2(g) ∆H = -190 kj C(s) + H2O (g) �¨ CO (g) + H2 (g) ∆H =
1. 1 answer
2. asked by key
3. 1,772 views
You do it by finding Uuh in the periodic table and knowing that it will have chemical properties that are similar to those in
1. 1 answer
2. asked by DrBob222
3. 1,615 views
problem:Dena borrowed $7500 to buy a used car. The credit union charged 9%(percent it looks kind of funny) simple intrest per
1. 2 answers
2. asked by Lindsey
3. 1,528 views
What is the density of N2O, a gas, at STP?How many moles are in 16 grams of O2? density = mass/volume 1 mol of a gas occupies
1. 1 answer
2. asked by Chris
3. 1,503 views
Two charges are fixed in place with a separation d. One charge is positive and has nine times (n = 9) the magnitude of the other
1. 0 answers
2. asked by Ann
3. 1,478 views
I'm supposed to write a poem in iambic pentameter and then scan it (with stressed and unstressed marks). However, I can't seem
1. 2 answers
2. asked by Claire
3. 1,338 views
When a tlc plate was developed the solvent front ran off the top of the plate, why?A two component mixture containing a
1. 0 answers
2. asked by Richard
3. 1,332 views
Part B True-FalseClassify each of the statements as always true, sometimes true, or never true. 1.____ST______ one mole of any
1. 1 answer
2. asked by Bryan
3. 1,284 views
How are length, area, and volume related in terms of the three dimensions of space?and How is it possible for objects of the
1. 1 answer
2. asked by Leiann
3. 1,250 views
Coordinating conjunctions are these: FANBOYS (for, and, nor, but, or, yet, so).Whenever you use one of these conjunctions to
1. 0 answers
2. asked by Writeacher
3. 1,228 views
How are length, area, and volume related in terms of the three dimensions of space?and How is it possible for objects of the
1. 0 answers
2. asked by Leiann
3. 1,206 views
whta were the three most populous states in 1860? were they northern or southern states?http://www.civilwarhome.com/population18
1. 0 answers
2. asked by vanessa
3. 1,172 views
A mother is twice as old as her daughter now, but ten years ago, she was 3 times as old as her daughter. Fins their ages at
1. 1 answer
2. asked by Michelle
3. 1,154 views
Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.
1. 0 answers
2. asked by ruby
3. 1,094 views
Al2Se3 (s) + H2O (sub>(l) ==> Al(OH)3 (s) + H2Se(g)You
1. 0 answers
2. asked by DrBob222
3. 1,093 views
What factors/influences help shape a country's identity? How does the leadership/government of a country generate consensus for
1. 0 answers
2. asked by Alba
3. 1,072 views
How much sodium hydroxide, at what concentration, do I need to add to 500 mL of 0.1 N HCL to obtain pH 6.8. How do you calculate
1. 0 answers
2. asked by Ruby
3. 924 views
I have this question on a homework assignment and I am confused!It is not wise to rely on the__________ to determine whether a
1. 0 answers
2. asked by Rachel
3. 920 views
Hi,how many moles does 0.225g of oxygen atoms represent? If 1 mole of oxygen atoms represents 16.0g? Thanks mols = grams/molar
1. 0 answers
2. asked by bertie
3. 908 views
We know that the negative charge on the electron and the positive charge on the proton are equal. Suppose, however, that these
1. 1 answer
2. asked by Lauren
3. 903 views
Hello,I have to create a debate for my English class. I am debating a difficult topic, and I was hoping I could get some good
1. 0 answers
2. asked by Travis
3. 887 views
Completion (Help)To find the mass of a mole of a compound, scientists add together the __1____ of the atoms making up the
1. 2 answers
2. asked by Bryan
3. 886 views
I'm supposed to decide which is more relevant, message wise, to today - the myth of King Arthur or Sundiata. Any ideas?First I
1. 1 answer
2. asked by Claire
3. 860 views
The balanced equation doesnt seem to help because the thiosulfate is not in the equation, I think it is preventing the reaction
1. 0 answers
2. asked by jacob
3. 857 views
The atomic numbers and masses must added up on both sides of the equation just as we must have the same number of atoms on each
1. 0 answers
2. asked by DrBob222
3. 828 views
In "The Awakening" by Kate Chopin, what is the "gangrene passion"?http://www.pagebypagebooks.com/Kate_Chopin/The_Awakening_and_S
1. 0 answers
2. asked by Anonymous
3. 795 views
Please can you assist me with the following problem I am totally muddled - I could swear I've never even heard of science!!!H2SO
1. 0 answers
2. asked by Billy
3. 772 views
What acts brought the United States into World War 1?http://en.wikipedia.org/wiki/World_War_I Read the section on causes. =)
1. 0 answers
2. asked by Anonymous
3. 768 views
~~Use bulleted lists rather than burying data in paragraphs; it's harder to read and comprehend when buried so.~~Use graphs and
1. 0 answers
2. asked by Writeacher
3. 761 views
What did Harding want to do to return America to "normalcy"?Here are his words: http://www.vlib.us/amdocs/texts/34hard1.htm I
1. 0 answers
2. asked by Anonymous
3. 753 views
The (aq) solution with the lowest freezing temperature would be which of the following:0.010M NaCl 0.020M NaCl 0.030M C6H1206
1. 1 answer
2. asked by anonymous
3. 752 views
what is the mass of two moles of NaCl?You look up the exact numbers on the periodic table or some other chart. I will use
1. 0 answers
2. asked by Dennis
3. 743 views
x+1 -x+2 = x+3____ _____ ____ 2 3 4 How do I solve this equations? These are fractions mi don't know I'm going to assume your
1. 0 answers
2. asked by deborah
3. 723 views
Can you help with this one please?A drop of oil (vol 0.05cm^3) is released on to a calm surface of a pond where it spreads out
1. 0 answers
2. asked by Bruce
3. 718 views
What is litum paper made of?If you cant find anything can you try to find some websites for me? THANKS A LOT!! 8-] litmus paper
1. 1 answer
2. asked by Christina
3. 716 views
How many grams of NaCl (molar mass = 58.4 g/mole) must be added to 12.0 g of water (molar mass = 18.0 g/mole) so that Xwater =
1. 0 answers
2. asked by Aletha
3. 708 views
(2x-3)(x^2+5x-3)=2x+10x^2-15x+9*Is this correct.? this is a different problem... Here's how this one works out: ......x^2 + 5x -
1. 0 answers
2. asked by Margie
3. 706 views
What do you associate a country's identity? Provive an example to help me understand please!Maybe what sort of things do you
1. 0 answers
2. asked by Alba
3. 686 views
The fastest measured speed of a ball in the game Jai-Alai is 302 kilimeters/hour. In men's tennis, the fastest recorded serve
1. 0 answers
2. asked by Chrys
3. 686 views
Is this equation balanced?2HCl(aq) + Ca(OH)2(aq) -------> 2H2O + CaCl2 yes. It helps in these to write water as HOH, in this you
1. 0 answers
2. asked by Lisa
3. 673 views
Given that arg((z-1)/(z-2i)) = pi/4 describe the locus of P and sketch this on an argand diagram. Show that the point (1,3) lies
1. 0 answers
2. asked by Jake
3. 669 views
Look at gold. It has an atomic number of 79. Adding 1 proton would make it have 80 protons and that element (from the periodic
1. 0 answers
2. asked by DrBob222
3. 662 views
I have a math question that goes like this: There are 500 light that have on and off switches. One person goes and turns all the
1. 0 answers
2. asked by Danielle
3. 652 views
I cannot figure out how to work this stoichiometry problem with the given equation: Mg+2HCl-->MgCl2+H2What volume of hydrogen is
1. 0 answers
2. asked by Carter
3. 651 views
If a chemistry student collected 825 mL of gas at 25 degrees C and 7.90*10^2torr, how many moles did she collect?PV=nRT Put P in
1. 1 answer
2. asked by Chrissy
3. 651 views
Suppose the preferences of the individual change in such a way that the individual requires now to be compensated to forgo one
1. 0 answers
2. asked by tofu
3. 650 views
Help me out! Thanks! You guys have really helped me before.Question 1 What does the law of inertia say about the velocity and
1. 1 answer
2. asked by Chris
3. 648 views
in your opinion......should bush bring back our troops.I don't think your teacher wants the opinion of an anonymous Internet
1. 0 answers
2. asked by Annaiiz
3. 645 views
I started having trouble on part (c), and I need to know this beforeI can go onto the other problems. Plz help! The parabola
1. 0 answers
2. asked by Emily
3. 645 views
When were children required to go to school in Wisconsin?1879. more info can be found @ infoplease. can you tell me what you
1. 0 answers
2. asked by Winona
3. 641 views
(-2x^2y)^3*(5xy^3)^2=(-2x^2y)^3 = -8 x^6 y^3*Is this correct.? (-2x^2y)^3 * (5xy^3)^2 = (-8x^6y^3) * (25x^2y^6) = -200x^8y^9
1. 0 answers
2. asked by Margie
3. 639 views
I submitted this question earlier... can anyone help me pls.This question is about the polymer made by polymerizing this
1. 0 answers
2. asked by david
3. 633 views
hey you guys I post a question like five hours ago and I would like to know if there is at least a website in were I could get
1. 0 answers
2. asked by desperate
3. 630 views
Hi you guys please help me with my chemistry homework, i need to find all these items and take them to my class in a ziploc bag*
1. 0 answers
2. asked by desperate
3. 626 views
x/9 +3 = 8 - x/3Solve?????? First, get rid of the fractions to make the equation easier to solve for x. Let's multiply every
1. 0 answers
2. asked by deborah
3. 625 views
Dr bob,Thanks, i understand that, at last! But wot if im asked to calculate when it is given as words? would it still be the
1. 0 answers
2. asked by bertie
3. 624 views
Discussing a book that involves a conflict between two charactersleads children to: 1. examine their values 2. fear
1. 0 answers
2. asked by Karin
3. 613 views
thanks for helping me with the list. By checking the product's labels I'm finding many of the substances the problem now is that
1. 0 answers
2. asked by desperate
3. 609 views
A rocket is propelled from the top of a building 30 meters tall so that its height in meters (t) seconds after it is launched is
1. 0 answers
2. asked by Aletha
3. 607 views
Everything is neutral. Touch a table, a chair, a desk, a tree, and you don't get a shock. Compounds are neutral. So Al2O3 must
1. 0 answers
2. asked by DrBob222
3. 594 views
A company is considering a $250 million investment in land that it will hold for 25 years. The pretax net cash flows are $40
1. 0 answers
2. asked by isabella
3. 594 views
my i have help?Can you help with this one please? A drop of oil (vol 0.05cm^3) is released on to a calm surface of a pond where
1. 0 answers
2. asked by vada
3. 592 views
what are the different names of equipment used for cooking?Please post the names of the equipment that you know. Then, we'll be
1. 0 answers
2. asked by alice
3. 591 views
A company is considering a $250 million investment in land that it will hold for 25 years. The pretax net cash flows are $40
1. 0 answers
2. asked by isabella
3. 590 views
This question is about the polymer made by polymerizing this compound:CH2=CH-CH-OH | CH Please identify the monomer unit - there
1. 0 answers
2. asked by david
3. 589 views
What would have happened if the United States had not entered World War 1 on the side of the Allies?Read the prior link I sent,
1. 0 answers
2. asked by Anonymous
3. 589 views
What is considered a good score to achieve on the ACT's? At what score on the 1-36 point scale is so low that you should
1. 0 answers
2. asked by Aubrey
3. 582 views
What kind of people are good role models?This site will give you some ideaS. http://en.wikipedia.org/wiki/Role_model
1. 0 answers
2. asked by GuruBlue
3. 576 views
Can somebody pls help me with this?For the equation below find the net balanced equation: Ag + NO3- --> Ag+ + NO (Note: This
1. 0 answers
2. asked by Lisa
3. 574 views
I started having trouble on part (c), and I need to know this beforeI can go onto the other problems. Plz help! The parabola
1. 0 answers
2. asked by Emily
3. 573 views
Can anyone please help?ive been asked to write a balanced chemical equation for the breakdown of seleniuos acid H2SeO3 in water
1. 0 answers
2. asked by bertie
3. 568 views
When the Bank of England cut interest rates does that mean inflation is reduced??No. When the Central Bank cuts interest rates,
1. 0 answers
2. asked by Molvis
3. 568 views
can someone explain what "Big O" notation is. I looked on wikipedia and still do not understand it.
1. 0 answers
2. asked by Anonymous
3. 566 views
Why do people say that we should have a big breakfast and a small dinner?Thank you for using the Jiskha Homework Help Forum.
1. 0 answers
2. asked by Sammy
3. 561 views
h t t p : / / img . photobucket . c o m / albums / v166 / stuffy1 / Mathhwforjonrevisedwithoutnotes . j p gNix the spaces!
1. 0 answers
2. asked by John
3. 558 views
Why does each time zone extend 7 1/2 degrees on each side of central meridian rather than extending from 0 degrees to 15 degree?
1. 0 answers
2. asked by Bob
3. 557 views
What the are similarities between aerobic respiration and fermentation?mi don't know to hard go to googles wish i could help
1. 0 answers
2. asked by Amanda
3. 557 views
1.Name the Canadian ports that are opened all year round.2.Which Canadian city is the eastern most provincial capital? Plz help.
1. 0 answers
2. asked by Kate
3. 554 views
B) r h o e e y e y m s r uw_a_ m_ _ea_t _l__ve hint ...or my lungs open my collar http://www.ojohaven.com/fun/crossword.html
1. 0 answers
2. asked by lynn
3. 526 views
what falls but never breaks?what breaks but never falls? night/day
1. 0 answers
2. asked by lynn
3. 507 views
I need to take some following samples of these:*a hydrocarbon w/a molecular mass greater than 100 g/mo *something w/ L-carvone
1. 0 answers
2. asked by VaNeSsA
3. 494 views
6*1/23 pretty much 6 X .5 which is the half of 6 which is 3!
1. 0 answers
2. asked by Reese
3. 484 views
mols of HCl= 0.1N X 0.5L=0.05 mols of HClTherefore, number of mols of 2N NaOH needed to obtain pH 6.8: 0.05 mols HCL/2 = 25 mL
1. 0 answers
2. asked by Ruby
3. 478 views
unscramble hautishiatus
1. 3 answers
2. asked by jake
3. 471 views
can someone please prove the difference rule to me?d/dx[f(x)-g(x)]=d/dx f(x)- d/dx g(x) Go to the definition of a derivative:
1. 0 answers
2. asked by Laura
3. 464 views
Im not sure how to do this.(5q^3)(-12q^-4n^4) So far what i did was multiply 5 by -12 to get -60. Then q^3 by q^-4 to get q^-1.
1. 0 answers
2. asked by Sammy
3. 457 views
my i have help i am making bad gradesWhat if an equation had three variables?
1. 0 answers
2. asked by vada
3. 457 views
3a^3b^2(-a^3b-a^2b^2)=-3a^9b^3-3a^6b^4*is this correct.?- Remember to add exponents when multiplying with the same base.
1. 0 answers
2. asked by Margie
3. 448 views
can someone please prove the difference rule to me?d/dx[f(x)-g(x)]=d/dx f(x)- d/dx g(x) plz help
1. 0 answers
2. asked by Laura
3. 409 views
12.
1. 0 answers
2. asked by Aletha
3. 303 views

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