Friday
November 28, 2014

Posts by Anna


Total # Posts: 2,037

AP Chem
A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 458-mg sample of the barium compound if a solution of the sample gave 513 mg BaSO4 ...
November 3, 2008

PIGSKIN GEOGRAPHY
WHAT KIND OF GRAINS ARE IN CEREAL BESIDES CORN, WHEAT, AND OATS?
November 3, 2008

AP Chem
I divided by 111.1. Our teacher likes us to use 3 digits when using atomic weight.
November 3, 2008

AP Chem
Oh wait, is this one like the last one I asked for? I didn't work that one out yet.
November 3, 2008

AP Chem
An aqueous solution contains 4.50 g of calcium chloride, CaCl2, per liter. What is the molarity of CaCl2? When calcium chloride dissolves in water, the calcium ions, Ca^+2, and chloride ions, Cl^-, in the crystal go into the solution. What is the molar concentration of each ...
November 3, 2008

AP Chem
A 3.50 g sample of KCl is dissolved in 10.0 mL of water. The resulting solution is then added to 60.0 mL of a 0.500 M CaCl2(aq) solution. Assuming that the volumes are additive, calculate the concentrations of each ion present in the final solution. *confused*
November 3, 2008

AP Chem
Yes, thank you. I was trying to do the equation like it was a carbonate that produced carbon dioxide, not as an acid.
November 3, 2008

AP Chem
Complete and balance each of the following molecular equations, including phase labels, if a reaction occurs. Then write the net ionic equation. If no reaction occurs, write NR after the arrow. H2CO3(aq)+Sr(OH)2(aq) -> this is what I put but I think its wrong H2CO3(aq)+Sr(...
November 3, 2008

Square Root Help!!! Urgent:)
1. 4 times squareroot 10 2. 3 times squareroot 11 3. 13 4. 2 times squareroot 3
November 3, 2008

algebra
how would you factor 25z^2 + 16
November 3, 2008

Math
subtract .2b from both sides. 0.3b + 3.4 = 12.4 subtract 3.4 from both sides 0.3b = 9.0 divide both sides by 0.3 b= 30
November 3, 2008

trig
what is the inverse tangent of (rad3/3)?
November 1, 2008

trig
inverse cos (-rad2/2)=135 degrees inverse sin (-rad2/2)=-45 degrees I dont understand why cos is 135
November 1, 2008

Math
d
October 26, 2008

chem
calculate the longest wavelength visible to the human eye
October 20, 2008

Essay
oh yeah i know they arent sentences. they are just ideas for the sentences. but they have to be in inverted order and i need a topic broader than giving back to the community.
October 19, 2008

Essay
i'm writing an inverted intro paragraph and these are the sentences i have so far. 1. ? 2. giving back to the community 3. community service 4. the youth volunteering 5. benefits of youth volunteering for commuity service can anyone think of a beginning sentence or make ...
October 19, 2008

phsical education
i need a lot of help lets just say that my gym teacher is making my class take health so i have a huge asignment due on monday i need 101 ways to be healthy they can be physical, emotional, mental,social, intellectual, and spiritual Good Luck (i know i tryed) -ANNA-
October 15, 2008

Physics
Someone posted the question below, stating that they knew the answer to part A but needed help with part B. Well even with the answer for A, I can't figure it out! Can you take a step back from the question below to show me the steps for solving part A? I've been ...
October 14, 2008

7th grade
WOULDNT THE TOTAL BE $3.60
October 14, 2008

physiology
as ___________increases, the two-point threshold decreases a.receptor # b.receptor density (i think its this one) c.receptor sensitivity d.receptor sensation
October 14, 2008

physiology
Bleaching induces conformational changes in both retinene and the associated opsin. T or F I don't understand this bleaching process
October 14, 2008

physiology
neurotransmitter release would be inhibited by a.stimulating repolarization of the axon terminal b.blocking Ca2+ influx in the axon terminal c.blocking repolarization of the axon terminal d.stimulating protein kinase activity I think its b, but not sure
October 12, 2008

physiology
what percent of blood flow to the body per minute goes to the brain ? 10, 20, 25, or 30% ?
October 12, 2008

physiology
the blood-brain barrier prevents hydrophobic molecules from diffusing into the brain. T or F Excitable cells are incapable of maintaining a constant resting membrane potential. T or F The membrane of resting nerve cells is more permeable to______ions than _________ions. a....
October 12, 2008

social studies
How do monopolies threaten the free enterprise system?
October 8, 2008

Consumer math
How to Compute percent of change in cost: Item:1 lb.apples price in 1970: 0.25 what is the Present price and what is the percent of change?
October 8, 2008

geography
Geography of Greece. How did it affect the people living in the region?
October 7, 2008

government
What is the newest government agency formed just earlier this week?
October 7, 2008

Spanish
linda--pretty princesa--princess reina--queen mi amor--my love
October 7, 2008

spanish
son las tres menos quince en punto.
October 7, 2008

science
OK,the question is what three statements that define all living things in terms of a cell? crossword puzzle! Anna
October 7, 2008

college - visual arts
R u doin it on a computer hi
October 7, 2008

AP Chem
Calculate the number of atoms in 32.0 g Br2. I keep getting 1.20 * 10^23 atoms Br2 but my book says i'm wrong.
October 5, 2008

math
3/5.37 = 8/14.32
October 5, 2008

AP Chem
but don't i have to know the formula for ethylene glycol?
October 5, 2008

AP Chem
Combustion of 6.38 mg of ethylene glycol gives 9.06 mg CO2 and 5.58 mg H20. The compound contains only C, H, and O. What are the mass percentages of the elements in ethylene glycol?
October 5, 2008

English: what's the formal term for...?
suspense?
October 5, 2008

Math
A book has n consecutive pages torn out (each paper in a book has two sides - each side is one page). Suppose A is the last numbered page before the torn out section and B is the first numbered page following the torn-out section. Find a formula for n in terms of A and B.
September 22, 2008

Science
did that help
September 22, 2008

Science
It would be a physical change because wjat it is made out of stays the same.
September 22, 2008

Math
Will a parabola intersect its directrix sometimes, always, or never?
September 22, 2008

Math
What is the length of the latus rectum of x^2=20y X squared equals twenty Y
September 22, 2008

Math
Find the equation of the parabola with directix y=3 and focus (5,7)?
September 22, 2008

math
10.9186
September 22, 2008

English
Can someone please proof read this? In A Raisin in the Sun, Lena Younger is the nurturing, ethical character who keeps the Younger family in line. First of all, Lena is a caring mother. For instance, when Walter runs away from his family because no one will listen to his ...
September 21, 2008

math
On the plant ZOG,colored coins are used formoney. Suppose 12 white, 9 red, 8 yellow, 4 blue, and 0 green can be exchanged for 2 white, 1 red, 0 yellow, 1 blue ,and 1 green. Also, suppose 1 green = N blue, 1 blue = N yellow, 1 yellow = N red, and 1 red = N white coins. What is ...
September 16, 2008

Chemistry Honors
well put
September 16, 2008

Language Arts
comprehend, curled up, fear
September 16, 2008

math
Given an infinte geometric series, with S=14 and the first term 9, find the ratio between terms.
September 16, 2008

math
1) 13 and -13 2) 5 and -5 I think I could be wrong
September 16, 2008

science
you need to change mL to grams and use conversions
September 16, 2008

Economics
This is what I came up with from my chapter reading, but this subject is confusing me. There is not a direct relationship between Gross Domestic Product and the economic well being. There may be a correlation in some instances, however high Gross Domestic Product does not ...
September 15, 2008

Economics
What is the relationship between the level of Gross Domestic Product and economic well-being. What factors of well-being are missing from the Gross Domestic Product? Is there a point where the Gross Domestic Product could increase to such a high level that economic well-being ...
September 15, 2008

Math- Algebra
The function C(x)=4x+850 closely approximates the cost of daily production run of x picture frames. The number of picture frames produced is represented by the function x(t)=90t, where t is the time in hours since the beginning of the production run. now here's where I ...
September 11, 2008

English
Is this a good topic sentence for a paragraph? In A Raisin in the Sun, Lena Younger is the nurturing, morale character who keeps the Younger family in line and earns your respect in the story.
September 10, 2008

Chemistry
what is the formula to change the temperature of K to C
September 10, 2008

P.E
What are the olympic ideals?
September 10, 2008

Math
For the equation y + 2 = -3/2(x-6) Identify the point found in the equation. Help?? what point are they talking about? =/
September 4, 2008

math
set it up like 75/750=x/100 cross multiply to get 750x=7500 x=10 therefore 10% of the parts were faulty
September 3, 2008

exponets
(12*2)=24 42-13=29 29+24 = 53
September 3, 2008

Math
18/6+3 is equal to 2 because 6+3=9 therefore, 18/9=2 no remainder in this problem.
September 3, 2008

Math
explain why the equation x^2 + y^2=1 does not define y as a function of x.
September 3, 2008

Math
what is the domain, range, and zeros of: f(x)=|x| and h(x)=|x|-2 ?? thank you!
September 3, 2008

math
1 miles = 1.609344 kilometers 55 X 1.609344 = 88.51392 km
September 3, 2008

Brookwood
A 67.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are .800 and .460 respectively. A) what horizontal pushing force is required to just start the crate moving? B) What horizontal pushing force is required to slide the ...
September 2, 2008

social studies
what was the name of the food that thomas jefferson returned to the u.s from france
August 30, 2008

American History
What was it about post-1763 British policy that would cause colonists in every section to see the disadvantages rather than the advantages of being part of the British empire? any help will be truly appreciated!!
August 22, 2008

Math
Help needed! round 1.16 to the nearest tenth
July 9, 2008

spanish
Pico la cebolla? No, no la piques picas pica piqué Please help me- these will not translate
June 4, 2008

Spanish
tuya for the first and ducho for the second?
June 2, 2008

Spanish
Eres muy generosa prestàndome estas joyas mías - yours nuestras- his suyas- ours tuyas-mine What is the question asking- prestadome wont translate- Also -Generalmente, me _____ por la mañana porque me ayuda a despertarme. Which is generally I ____ in the ...
June 2, 2008

Spanish
Tienes _______ materiales que me prestes para la clase de geometría. algunos algún algunas alguna can someone please help. I cant figure out which of the four choices are supposed to fill the blank.
June 2, 2008

SPANISH - help
Como quieres pagar por eso- What does this say? I have How do you want to pay for..therefore? Its that por eso that is making the sentence just not make sense becuase my book says por eso is thats why, therefore.
May 29, 2008

spansih
Que _____ traigo a Uds.? nos le les me What do ________ bring you? us him they me It doesnt make sense does it?
May 21, 2008

History
How was Charles II involved with the Royal Society and science in general?
May 11, 2008

science
is it a comet?
May 5, 2008

science
What is a Comet Star ? IS it a star or type of Comet?
May 5, 2008

Science
What is a Comet Star?
May 5, 2008

Government
I have many questions: -How many judges does the Supreme Court have? -Who has the right to decide wether a federal, state or local law is constitutional?
May 4, 2008

geometry
An advertisement states that a Roto-Sprinkler can water a cicular region with area 1000 ft^2. Find the diameter of this region to the nearest foot. Use pi = 3.14.
April 27, 2008

geometry
nope. i figured it out. you have to use pi to find the areas of both pizzas and then their ratio is 1:4 so 6*4 = 24
April 27, 2008

geometry
the answers 24. i looked at the answers cus i thought it was 12 too
April 27, 2008

geometry
if 6 oz of dough are needed to make an 8-in. pizza, how much dough will be needed to make a 16-in. pizza of the same thickness? (compare the areas of the pizza tops) i don't know what to do
April 27, 2008

Biology 101
A portion of DNA molecules wound around a spool of histone protein is called a A. Centromere B. Nuclesome C. Spindle D. Furrow E. Cell Cycle
April 20, 2008

trig
y = cos(4x/3 minus 1) amplitude? Period? Two x - intercepts? y-intercept? Domain? Range? Shift along x? Shift along y? Kind of reflection?
April 19, 2008

chemistry
mols acetic acid = 0.024 Lx 0.39 mol/L = 0.00936 mols mols KOH = 0.33 mol/L x 0.017 L = 0.00561 mols pH = +log(0.00936)(0.00561) = -4.279 = 14 + -4.279 =9.7 I am stuck
April 19, 2008

trig
y = sin(-3x + 3) Amplitude = Period = Two x- intercepts = y - intercept = Domain = Range = Shift along x = Shift along y = Kind of reflection =
April 19, 2008

chemistry
I GOT A CORRECT ANSWER!!!:):):):):):):::)::):::):):):)::)))::)):):)::)::):):):):)::)::):) THANK YOU!!!!!
April 19, 2008

chemistry
Pb3(PO4)2 <==> 3Pb^+2 + 2PO4^-3 Since [Pb3(PO4)2] = 2.3 x 10^-9 (Pb^+2) = 6.9 x 10^-9 (PO4^-3)= 4.6 x 10^-9 Ksp = (Pb^+2)^3*(PO4^-3)^2 = (6.9 x 10^-9)^3*(4.6 X 10^-9)^2 =(3.2850 X 10^-25)(2.116 X 10^-17) =6.951 X 10^-42 Please check if my answer is correct. It seems...
April 19, 2008

chemistry
If the concentration of Pb2+ is found to be 2.3 x 10-9 mol/L in a saturated solution of Pb3(PO4)2, what is the Ksp of Pb3(PO4)2 ? This is my work thus far it is as far as I could get: Ksp = [Pb2+] [Pb3(PO4)2] = [2.3 x 10-9 mol/L][Pb3(PO4)2]
April 19, 2008

trig
Can you do one more please? This one is the same as seven of my other practice problems y = sin(-3x + 3) Amplitude = Period = Two x- intercepts = y - intercept = Domain = Range = Shift along x = Shift along y = Kind of reflection =
April 18, 2008

chemistry
What is the percent ionization of a 1.38 mol/L weak acid if its Ka = 2.7 x 10-6? Answer to two (2) decimal places. I know what steps to use but have difficulty applying them to the quesiton Can someone please complete the question for me since there are about 10 other ...
April 18, 2008

trig
SO my answer would be sqrt 3?
April 17, 2008

trig
Is the exact value of sin(pi/3) + cos(pi/6) equal to 1.73?
April 17, 2008

Physics
Suppose you have a perfectly spherical water tank with an inside diameter of 8.6 metres. If the drain at the bottom of the tank can't handle a hydrostatic pressure of more than 50 kilopascals, what is the maximum volume of water, in litres, that can be contained in the ...
April 16, 2008

chemistry
Let me try! Let me try! :) nickel(II)nitrate and zinc nitrate -->Ni|Ni^+2 (??M) ||Zn^+2 (??M)|Zn Iron(II) nitrate and zinc nitrate -->Fe|Fe^+2 (??M) ||Zn^+2 (??M)|Zn Silver nitrate and zinc nitrate -->Ag|Ag^+2 (??M) ||Zn^+2 (??M)|Zn Is this correct? Also, how would I ...
April 15, 2008

chemistry
what would be the cell notation using nickel(II)nitrate and zinc nitrate?
April 15, 2008

chemistry
Let me try! Let me try! :) nickel(II)nitrate and zinc nitrate -->Ni|Ni^+2 (??M) ||Zn^+2 (??M)|Zn Iron(II) nitrate and zinc nitrate -->Fe|Fe^+2 (??M) ||Zn^+2 (??M)|Zn Silver nitrate and zinc nitrate -->Ag|Ag^+2 (??M) ||Zn^+2 (??M)|Zn Is this correct? Also, how would I ...
April 15, 2008

chemistry
Lab: Galvanic Cells Purpose: The purpose of this activity is to demonstrate the design and operation of a galvanic cell used in scientific research and to compare the measured potential difference of that cell to the calculated potential difference using a standard table. ...
April 15, 2008

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