Friday
April 18, 2014

Posts by Hannah


Total # Posts: 2,802

chem
i need help on this question: Equal masses of gaseous N2 and Ar are placed in separate flasks of equal volume at the same temperature. Tell whether each of the following statements is true or false. a) There are more molecules of N2 are present than atoms of Ar. true or false....

World Geography
What are three ways geography influenced Roman History?

math
if csc theta= -5/3 and theta has its terminal side in quadrant III, find the exact value of tan 2 theta.

English
for "Children of the River" I have to come up with a thesis statement for chapter 1 I dont know what it is.....please help

Algebra 1
What property justifies that 3y+9 = 9+3y

Math(Please check)
What is the difference between the actual increase in profit as production increases from 5 to 6 units, and the marginal profit at a production level of 5 units where the profit function is given by p(x)= 3x^2 - 5x + 2 First I plugged 5 into the equation and got 52. Then I too...

Math(Please check)
Find the slope of the graph at y=sqrt 2x^2 +1 at the point (2,3). First I plugged 2 into the equation and got 3. Then the derivative of the equation is 4x and then I multiplied that by 3 and got 12. Is this correct?

Math
Find the derivative of f(x)= 2 sqrt x at x=4. i thought that the derivative would be 2 x^1/2 but I guess this is wrong.

Math
Calculate the limit limit x->infinity 2x^2 + 100 / x^2 +1 I am not sure how to do this.

Math
Find the slope of the curve at y=x^6 at x=-3. I know that to find the slope you do y2 - y1 / x2 - x1 but I do not know what to do here.

Math(Please check)
So if though it says that the rate at which the epidemic is spreading is 110 per day that is not rate of change correct?

Math(Please check)
During the month of February, a flu epidemic hit the University. The number of people sick at time t (measured in days) is given by the function P(t). The rate at which the epidemic is spreading on February 3 is 110 people per day. How is the information best represented mathe...

Math(Please check)
I had the negative sign there because thatg was one of the answer choices that best fit what I had but there is no negative correct? Its positive?

Math(Please check)
Find the derivative of f(x)=1/3 sqrt x. The 3 is little above the square root. I know that it is -1/3x^-4/3. Can this be written as -1/3x^4/3 ?

Math(Please check)
Another answer choice was y=-2076x + 15,780. Is this correct? If it is I do not understand how they go -2076. Thank you for your help!

Math(Please check)
The value of an automobile was $15,780 in 1994 and depreciated to $5400 in 1999. Let y be the value of the automobile in the year x, where x = 0 represents 1994. Write a linear equation in slope-intercept form that models the value y of the automobile, x years after 1994. Woul...

Math(Please check)
Thank You

Math(Please check)
Find the derivative of f(x)=7x-19 at x=2. I think that the derivative would be 7 and theb times 2 so 14. Is this correct or would it just be 7.

chem
I know carbon is tetrahedral but i dont know oxygen

chem
I dont get how to the structure and how to find oxygen separetley

chem
Determine the electron and molecular geometries of each of the following molecules. For those with more than one central atom, indicate the geometry about each central atom. (Enter your answers in the order given in the skeletal structure from left to right.) CH3OH (skeletal s...

What do taxes pay for
RACEMIDE

Help
Thanks, it didn't look right thats why I reposted

Help
I get x=3 can you let me know if I have it right

Help
Is there a website that will help me solve this? I can't find anything. I'm coming up with x=1/3 but I feel I'm doing it wrong. Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there is no sol...

Math
Is is x=1/3

Math
Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there is no solution, answer as "No solution."

Health
thanks, do you have any other suggestions?

Health
I need an example of a health fraud item/ product. I need to find one product that has health fraud and that I can write 150 words about. I tried searching on google but cant find anything/ dont know what to search. do you know of any products? thanks

History
Describe an advantage of havinf federal judges appointed rather then elected

History
Why is it important to learn about the government?

History
What problems might arise from making the runner-up in the presidential election the vice president?

chem
thanks:)

chem
For each of the following sets of atoms and ions, arrange the members in order of increasing size. Mg2+ F- and Na+

algebra
whats the lcd of 8/9x+2/3x=1/9x+45

science
can you unscrample this word? its in french. "ratuere"

5th grade algebra
Omg thanks so much!!!

5th grade algebra
I need help with input out put table. The top row is: 1, 4, 3 5 8 9 6 The bot row is: 1, 10,7,13 ? ? ? The question marks are blanks in the table. Hellllllp please

Math
I am looking for help integrating using u substitution over the interval of 0 to pi/2 the function cos(2x/3)

Math
Solve integration using u substitution of (x+1)sqrt(2-x)dx

Math
Solve integration using u substitution of (x+1)sqrt(2-x)dx

chem
oh i got it:) thanks:):)

chem
i tried [Kr]5s24d8 but it didnt work

chem
Use the periodic table to write electron configurations for each of the following elements. (Type your answer using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2.) 1. Pd thanks

chemistry
How many grams of oxygen gas are reacted if 75 g of hydrogen gas is consumed?

science
How does a tennis ball change shape when you hit it?

Physics
Consider the 676 N weight held by two cables shown below. The left-hand cable had tension 740 N and makes an angle of θ with the wall. The right-hand cable had tension 730 N and makes an angle of θ1 with the ceiling. a) What is the angle θ1 which the righthand ...

chem
What is the frequency of radiation whose wavelength is 26.80 Angstrum ? at first i got 1.000e17 and it was wrong. now i only have 1 more try. i tried it again and got 9.993e16 but i dont want to put it in unless its correct. can you guys check my work?

Calculus
Find dy/dx, y= -7e^6x+11 + xe^x

science
what properties of carbon explain its ability to form many macromolecules?

physics
A car moving at 20m/s is sounding its horn as it approaches you. If the actual frequency of the horn is 283 Hz, what frequency will you hear at 25.0 degrees C?

Thermochemistry
How many grams of water at 0 degrees C can be frozen into ice at 0 degrees C if 55.0 kJ of heat is removed? delta Hsolid= -6.01 kJ/mol

Thermochemistry
3CO(g)+ Fe2O3(s) --> 2Fe(s) + 3CO2(g) + 24.7 kJ. How much heat is released when 56 grams of CO react?

Chemistry
The molar heat of solution of NH4NO3 is 25.7 kJ/mol. How much heat (in kJ) would be required to dissolve 20 grams of NH4NO3 in water?

Chemistry
How much heat is required to convert 9 grams of water at 100 degrees C into steam at 100 degrees C. Hvap for water = 40.7 kJ/mol

Chemistry
Si(s)+ 2Cl2(g) --> SiCl2(g) --> SiCl2(l) + 687 kJ. How much heat is produced when 106 grams of Cl2 react?

Chemistry
A student mixes two water solutions with an initial temperature of 25 degrees C to form a final substance with a mass of 65 grams at 30 degrees C. What is the heat change in kJ?

Chemistry
How much heat in kJ is required to melt 54 grams of ice at 0 degrees C into water at 0 degrees C if delta Hvap for water = 6.01 kJ/mol?

Chemistry
How many calories are required to raise the temperature of 75 grams of water from 20 degrees C to 50 degrees C?

question about corrections(what they mean)
ok thanks:)

question about corrections(what they mean)
ok. so this may be hard to explain and may not be enough info that you understand but ill try. I did a paper and my teacher corrected it and said changes i need to make. here is a clip from the paper of something that she commented on: " Here are some examples. Hard Tack ...

english- need a creative title!
thanks for the idea. That would probably work but I don't know if my teacher would understand it because that is not one of the slang words i described in my paper. do you have any other ideas?

english- need a creative title!
For my english class i had to right a paper on civil war slang and how this topic releated to the book The Red Badge of Courage. I finished my paper but have no idea of a creative title. Im not good at thinking up good titles :/ have any ideas?

Algebra
why is any real number a solution for the equation 8y - 30 = 4(2y - 7.5)

chem
i dont think 34 is correct because that is way more than 10% of my first answer of 5.7

chem
Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s) + H2SO4(aq) --> Na2SO4(aq) + 2 H2O(l) + 2 CO2(g) S...

Math
A population is 200 in the year 1825, 252 in 1850, and 318 in 1875. What is the p(t) equation? I see that the population increases 26% over each 25-year period but I can't figure out the equation.

Math
Dina earned 1/4 for baby sitting and 1/2 for washing the dishes. How much money did she NOT earn from $25.00?

Geometry
sam..? im assuming just like the others we cannot see your documents so we don't know what the picture looks like. sorry

chem
thanks for the help: can you help me with another one? Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s...

chem
thanks so its 5.21 L h2?

chem
2Al(s) + 2NaOH(aq) + 2H2O(l) 2NaAlO2(aq) + 3H2(g) (unbalanced) sorry i forgot. it was unbalanced but then i balance it

chem
Calculate the number of liters of hydrogen, measured at STP, that can be produced from the reaction of 0.155 mol of aluminum according to the following unbalanced chemical reaction equation. i got .193 L of H2 but it was wrong. i only have one submition left!

Geometry Please Help
im sorry your link/document doesnt work

chem- plz check my work
2. Given the following equation, C2H5OH(l) + 3 O2(g)---> 2 CO2(g) + 3 H2O(l) How many liter of CO2 are expected in the combustion of 12.0 grams of ethanol? My work: 12.0g C2H5OH X 1 mol C2H5OH/46.08g C2H5OH X 2 mol CO2/1 molC2H5OH X 22.4L CO2/1 mol CO2 = 11.7 L CO2 all i ne...

chemisty
when looking at a chemical equation what are the evidences that a chemical reaction has occured. Or what is the evidence that it has not occured thanks:):) <3

Physics
What is the volume of 3.25 moles of a gas at a temperature of 115 K and a pressure of 275 kPa?

Physics
A pendulum is constructed of a 6.7 gram mass suspended on a 55cm thread. The mass is displaced vertically 55 cm to a point exactly horizontal from the top of the thread and released. The mass swings down and is cut directly above the mass when the mass is 120 cm above the floo...

CHOIR
can you find the music online? Why not just ask her for another copy when you get to school tomorrow and tell her what happened

english
I need two examples where in the book Huckleberry finn. Huck doesn't believe in himself or he is having self doubt. does anyone know an example or two where this happens in the book? thanks

chem
how would you find the answer? A carbon nucleus has six protons and six neutrons. How many electrons would it take to equal the mass of a carbon nucleus?

chem
can you explain? For each of the reactions shown, calculate how many grams of the product form when 16.8 g of the reactant in bold completely reacts. Assume that there is more than enough of the other reactant. 4 Cr(s) + 3 O2(g) 2 Cr2O3(s) thanks

huckleberry finn
in the book huckleberry finn manys words are used that mean something like "to beat someone" for example to lick. i need to find 8 more of words that are used to mean "to beat" if you know any and the page number/chapter it is used in the book that would be...

Chemistry
because you take the ratio and just use them as subscripts for its corresponding element. So if carbon came out to 2 and hydrogen came out to 6, then it would simply be C2H6.

Chemistry
It would be C2H6

Calculus
Find the unique solution to the differential equation y"?1y'?6y=?24(t^2)+10t+41 satisfying the initial conditions y(0)=?6 and y'(0)=?26

Calculus
(1 pt) Find the unique solution to the differential equation y"?5y'+6y=?312sin(2t) satisfying the initial conditions y(0)=?31 and y'(0)=?18

Geometry
You do 1/2 base times height, so 1/2(14cm)(18cm)=126cm. Dont forget units! Your welcome:)

Math fractions
You must make the denominators the same by multiplying the numerator and the denominator of 1/2 by four to get 4/8. Your welcome:)

huckleberry finn
also the word valley on page 174( at least in my book) its in the context that reads "the king said the cubby would do for his valley- meaning me"

huckleberry finn
what is the definition of dauphin this huckleberry finn? I searched on the internet but there were so many i didnt know which one was used in the book

math
Use a table of values to graph the equation. solve for y x= -1,0,1 y= y=2/3x+6

chem
I got it:) it was just not a precipitate:) Thankyou sooooo much:)

chem
could it also be an acid-base?

chem
or acid- base? because i did gas evolution oxidation-reduction precipitation single-displacement but got it wrong so I am thinking either one of those has to be taken out and/or acid-base added

chem
its not also a precipitation os single-displacement??

chem
Ca(s) + 2 H2O(l) Ca(OH)2(aq) + H2(g) acid-base double-displacement gas evolution oxidation-reduction precipitation single-displacement synthesis whichs one(s) is it?? thanks

chem
oops sorry

chem
thanks you so much. Also if i may ask im having trouble on another type of problem balancing this equation: C5H12O(l) + O2(g) --> H2O(g) + find the compound here I am able to balance it but i need to find the last compound i though it would be: C5H10O2 because i took out 2 ...

chem
thanks. so would it be double displacement and acid-base?

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