Thursday
December 8, 2016

# Posts by hannah

Total # Posts: 3,269

Chemistry
I did that. doesnt it have to be liters of the total solution? so how do we factor in the asprin into the liters?
January 22, 2013

Chemistry
What is the osmotic pressure formed by dissolving 50.8 mg of aspirin (C9H8O4) in 0.200 L of water at 18°C?
January 22, 2013

math
10+2n=8n-8(+8)
January 22, 2013

astronomy
36,000000
January 16, 2013

Physics
For the problem (8.99 X 10^9 NM^2/c^2)(1 X 10^-6c) / (.1m)^2 = .90 N When I put this in my calculator I did not get .90N. Am I suppose to convert the units to get the answer. Thank you for your help.
January 11, 2013

and how do i do that please
January 8, 2013

January 8, 2013

Hello Ms. Sue, How did you get 15 27/60 please? Thanks, Hannah
January 8, 2013

please help solved the following fraction 11 13/15 + 3 7/12 = 14 3/4 + 7 + 5 7/8 = Thanks, Hannah
January 8, 2013

science
how did the invention of the microscope help doctors to understand what caused diseases.
January 8, 2013

math
I don't know how to change 1/3 and 2 1/3 into a decimal and still show my work
December 19, 2012

Physics
A plane is heading south with a velocity of 150 kilometers/hour. It experiences a tailwind with a velocity of 20 kilometers/hour. Find the resultant velocity of the plane
December 17, 2012

environmental science
why are cultivation practices for pest control not widely used today?
December 16, 2012

physics
Sorry, i have no idea!!! I have a physics final tomorrow!!! Freaking out!!!!
December 13, 2012

algebra
a parking meter gives 30 minutes for each quarter and 6 minutes for each nickel. the equation 30x+6y=60 describes the number of quarters x and nickels y that you need to park for 60 minutes what does the x-intercept represent?
December 12, 2012

social studies
britain passed the stamp act
December 4, 2012

science
fertilization is the union of sperm cell and egg cell
December 1, 2012

science
what is the meaning of fertilization?
December 1, 2012

math
about 7x10 to the power of 3 babies are born each day in the city. about how many babies are born each day in the city?.give the abswer un standard form
December 1, 2012

math
if 3 bananas cost £1.14 how much will 5 of them cost? and how do you work it out?
November 23, 2012

math
if 3 bananas cost £1.14 how much will 5 of them cost? and how do ypu work it out?
November 23, 2012

math
if 3 bananas cost £1.14 how much will 5 of them cost? and how do ypu work it out?
November 23, 2012

math
if 3 bananas cost £1.14 how much will 5 of them cost? and how do ypu work it out?
November 23, 2012

Chemistry
What is the concentration in mol/L of a CuSO4 solution containg 1.0 mole of CuSO4 in 250 mL of Solution? I would like to know how to calculate the answer and be giving the correct answer please.
November 19, 2012

physics
A projectile is launched off of a 18.6 m high cliff with a velocity of 12.8 m/s. If the projectile is launched at an angle of 20° above the horizontal, how far did it travel horizontal before it hit the ground below?
November 15, 2012

english
also i have my introduction written and i need someone to check it over (its in outline form now) A. “I will instruct you and teach you in the way you should go; I will counsel you and watch over you.” Psalm 32:8 B. As the main character in Daniel Defoe’s book, ...
November 15, 2012

english
i am writing a literary research paper on the book robinson crusoe. my thesis is In "Robinson Crusoe" Daniel Defoe uses the protagonist to show the sporadic but guiding relationship between God and man. I am having trouble coming up with a title. So far I have "...
November 15, 2012

Scoial Studies
As a general rule, homeowners should carry property damage insurance on their structures amounting to at least ____ percent of their value (the cost of rebuilding them). A. 50 B. 60 C. 70 D. 80
November 15, 2012

chemistry
a chemist puts 6 moles of nitrogen gas and 7 moles hydrogen gas into an evacuated 1 liter container. The system reaches equilibrium at a certain temperature according to the process outlined above. when the system is at equilibrium the chemist determines the ammonia ...
November 14, 2012

math
Can't remember the way to solve for the variable. 5x + 6 = 7x. Answer is 3, but how to do other problems?
November 11, 2012

algebra
-13=5(1+4m)-2m
November 11, 2012

chemistry
If a saline solution has a concentration of 0.25 g per mL, calculate the following. a) The concentration of this solution in %w/v. b) The concentration of this solution in grams per litre (g/L). c) The concentration of this solution in milligrams per mL (mg/mL).
November 7, 2012

Consider the following equations. N2H4(l) + O2(g) N2(g) + 2 H2O(l) ÄH = -622.2 kJ H2(g) + 1/2 O2(g) H2O(l) ÄH = -258.5 kJ H2(g) + O2(g) H2O2(l) ÄH = -187.8 kJ Use this information to calculate the enthalpy change for the reaction shown below. N2H4(l) + 2 H2O2(l...
November 6, 2012

Math Algr.2
Convert to standard form (AX+BY=C) 1.y=3/2x+6 2. 2/3y=2x-5 3.7y-21=1/2x 4.-2/3x+3/4y=1 Convert to Slope/intercept form (y=mx+b) 1.3x-27=14 2.-9y-6x-18=0 3.8-2x+4y=0 12x=4y-8 I need help going through this because I am not sure if I am doing everything right and I also don'...
November 6, 2012

chem- i reallyneed help
oops that's me ^
November 6, 2012

chem- i reallyneed help
Consider the following equations. N2H4(l) + O2(g) N2(g) + 2 H2O(l) ÄH = -622.2 kJ H2(g) + 1/2 O2(g) H2O(l) ÄH = -258.5 kJ H2(g) + O2(g) H2O2(l) ÄH = -187.8 kJ Use this information to calculate the enthalpy change for the reaction shown below. N2H4(l) + 2 H2O2(l...
November 6, 2012

chem urgent!
Set up a Hess's law cycle, and use the following information to calculate ÄH°f for aqueous nitric acid, HNO3(aq). You will need to use fractional coefficients for some equations. 3 NO2(g) + H2O(l) 2 HNO3(aq) + NO(g) ÄH° = -138.4 kJ 2 NO(g) + O2(g) 2 NO2(g...
November 6, 2012

chem
(a) When a 4.75-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter (see figure), the temperature drops from 23.0‹C to 16.6‹C. Calculate ƒ¢H (in kJ/mol NH4NO3) for the solution process NH4NO3(s) ¨...
November 6, 2012

Algr1
Find the x and y intercept of the equations. 1.5x+6y=-30 2.x-4y=-16 3.-3x+4y=12 How would I solve these and what is the anwsers
November 5, 2012

Algr1
Find the x and y intercept of the equations. 1.5x+6y=-30 2.x-4y=-16 3.-3x+4y=12 How would I solve these and what is the anwsers
November 5, 2012

Algr.1
Find the x and y intercept of the equations. 1.5x+6y=-30 2.x-4y=-16 3.-3x+4y=12 How would I solve these and what is the anwsers
November 5, 2012

Thank you!
November 3, 2012

For an experiment on specific heat capacities my data for measured specifi heats was consistently higher than the accepted values. I am not sure why this is. Would it be because my initial temperature that I started the experiment with was higher than it should have been? ...
November 3, 2012

I am trying to draw a constitutional isomer for the compound CH3CH=CHCH3 but I am having some trouble. H-C-C=C-C-H I drew the first compound like this with more hydrogens on the Cs. How could I draw another strucutre?
November 1, 2012

Please diregard, I figured out my mistake.
November 1, 2012

For an experiment on specific heat capacities of metal in physics, I am trying to calculate my percent error but am having some trouble. After collecting my experimental data for c (cal/g) for the object that was used which was aluminum my results are: trial 1 = .19 trial 2...
November 1, 2012

Please disregard. I figured out my mistake.
November 1, 2012

For an experiment on specific heat capacities of metal in physics, I am trying to calculate my percent error but am having some trouble. After collecting my experimental data for c (cal/g) for the object that was used which was aluminum my results are: trial 1 = .19 trial 2...
November 1, 2012

When is the best time to read review or discussion questions? A. Immediately after you have finished all of the reading. B. After you write your notes. C. Before you begin any detailed reading. D. Throughout your detailed reading.
October 30, 2012

ok thank you and for the specific rotation of L-erythrose 4-phosphate would it be the same as for D-erythrose 4-phosphate which I determined was 50 or would it be -50?
October 28, 2012

The path of length was given in cm so I converted it to dm but I am not sure if I calculated the concentration correctly. A 50 gram sample was dissolved in 10 mL solution so would I do 50/10?
October 28, 2012

Oh ok, the question asks me to find the specific rotation for D-erythrose 4-phosphate which I determined was 50 and then it asks me to find the specific optical rotation for L-erythrose 4-phosphate so I thought that it would be a different formula.
October 28, 2012

I know that to calculate the specific rotation for a compound you do observed rotation / path length(dm) * conc. (g/ml). I am confused about how to calculate the specific optical rotation for a compound. Thank you for your help!
October 28, 2012

Determine if the equation is SN1, SN2,E2 or E1. CH3CH2O- + CH3CH2BR = CH3CH2OCH2CH3 + BR- I think that this is SN2. Would you agree?
October 25, 2012

math
20 Minivans
October 24, 2012

Algebra 1
A 30-pack of blank CDs cost \$9.50. A 50-pack of CDs cost \$13. How can you tell which is the better buy?
October 21, 2012

Trigonometry
The average temperature, in °F, for Atlanta, GA is modeled by the sinusoidal function y = 18.25 sin(pi/6 t - 2.09) + 61.15 where t is the time in months and January is t=1. What is the average Temperature for the month of February? Using the same equation, what is the ...
October 20, 2012

How many chirality centers does the compound 1,3-dibromo-2,4-dichloro-5-fluorocyclopentane have? This compound has three different elements, a Br which is repeated twice, a cl which is also repeatd twice, and a fluorine. I was thinking that the number of centers would be 3 ...
October 18, 2012

Math
850 hectare = ? km^2 850 ha (1 km/100 ha) = 8.5km^2 Is this conversions correct? not just the answer but also how I got to the answer. PLEASE let me know if im on the right track, thanks!
October 17, 2012

Math
Change 300 mm3(cubed) to cm3(cubed). I have no idea how to work this out. Any help you can give me would be greatly appreciated!! Thanks
October 15, 2012

For C4H10O a constitutional isomer can be written as C-C-C-C-O-H with hydrogens also coming off of the 4 carbons. I know that this is an alcohol. I need to know if there are stereoisomers for this other than conformers. I think that there are stereoisomers because you can just...
October 11, 2012

For C4H10O a constitutional isomer can be written as C-C-C-C-O-H with hydrogens also coming off of the 4 carbons. I know that this is an alcohol. I need to know if there are stereoisomers for this other than conformers. I think that there are stereoisomers because you can just...
October 11, 2012

math
There were 12 boys and 18 girls in a class. Then, 3 more boys joined the class and 2 girls left. What is the ratio of the number of boys to the number of girls in the class now?
October 8, 2012

Econ
what is the purpose of the labor law- executive order- created in 1965
October 8, 2012

Math
For an experiement to test elastic collision, ball 2 was at rest and ball 1 was released from a certain height and distance and hit ball 2. A set of measurements were collected which was v1 and v2 prime for each ball. I need to calculate the kinetic energy before and after ...
October 6, 2012

Im alittle confused because my data sheet gives values for mass, height, diameter and then v1 and v'2. So would v1 ball one and V'2 ball two?
October 5, 2012

For an experiement to test elastic collision, ball 2 was at rest and ball 1 was released from a certain height and distance and hit ball 2. A set of measurements were collected which was v1 and v2 prime for each ball. I need to calculate the kinetic energy before and after ...
October 5, 2012

I am trying to figure out what functional group the compound CH2ClCH3 is in. I know that it is not a ketone, alcohol, ester, ether, amine, amide, ect..I do not know what it could be.
October 4, 2012

identify the functional group and indicate polar bonds by assigning partial positive and negative charges. 1) The structure CH3OCH3 is drawn out and I know that this is an ether because the O is bonded to two carbons but I am not sure how to assign the charges. I think that ...
October 4, 2012

Chemistry
I am trying to figure out what functional group the compound CH2ClCH3 is in. I know that it is not a ketone, alcohol, ester, ether, amine, amide, ect..
October 4, 2012

Chemistry
identify the functional group and indicate polar bonds by assigning partial positive and negative charges. 1) The structure CH3OCH3 is drawn out and I know that this is an ether because the O is bonded to two carbons but I am not sure how to assign the charges. I think that ...
October 4, 2012

Physical science.
A skydiver who jumps out of a plane that has a forward velocity of 40 m/s. That means that the skydiver has a forward velocity of 40m/s. Ignore the air resistance. The questions: What difference is there between the downward velocities of the skydiver who jumped out of the ...
September 28, 2012

So then they are not conformers or constitutional isomers correct?
September 27, 2012

I have to answer the following questions about C3H7Cl: Are there different constitutional isomers for this formula, are there different cis/trans isomer, and are there different conformers? I know that C3H7Cl can be drawn two ways: H-C-C-C-Cl With H's above and below the ...
September 27, 2012

Chemistry
I have to answer the following questions about C3H7Cl: Are there different constitutional isomers for this formula, are there different cis/trans isomer, and are there different conformers? I know that C3H7Cl can be drawn two ways: H-C-C-C-Cl With H's above and below the 3...
September 27, 2012

Science
Which of these statements concerning the interaction of light waves with the glass of a greenhouse is correct? A. Infrared is transmitted through the glass and is changed to heat B. The glass reflects ultraviolet waves C. Visible light is transmitted through the glass Or D. ...
September 26, 2012

career
September 25, 2012

career
Do veterinarians get paid during residency? If so how much?
September 25, 2012

physics
A 410-m-wide river has a uniform flow speed of 2.0 m/s through a jungle and toward the east. An explorer wishes to leave a small clearing on the south bank and cross the river in a powerboat that moves at a constant speed of 7.9 m/s with respect to the water. There is a ...
September 24, 2012

September 24, 2012

Using a force table the direction and magnitude had to be found for the following measurements: F1 = 200 grams at 30 degrees; F2 = 200 grams at 120 degrees The magnitude and direction found was 280 grams at 257 degrees. Using the magnitude and direction of F1 and F2 I need to ...
September 24, 2012

Oh ok I got 283 and 75 degreed from usng the Rx an Ry equations and then doing tan^-1(Ry/Rx), so 283 and 75 is my answer?
September 24, 2012

Using a force table the direction and magnitude had to be found for the following measurements: F1 = 200 grams at 30 degrees; F2 = 200 grams at 120 degrees The magnitude and direction found was 280 grams at 257 degrees. Using the magnitude and direction of F1 and F2 I need to ...
September 24, 2012

Chemistry Help? Thanks
At what temperature do KCL and KNO3 have the same solubility If a saturated solution of KNO3 at 20.0 C is heated to 80.0 how much more could be dissolved? If a saturated solution of KCL at 90.0 C is colled to 30.0 C how much of the solid will precipitate? How much NaCL will ...
September 23, 2012

math
the world record for the 100 meter butterfly swim set in 1999 was 51.81 sec. What was the average rate per second? thx:)
September 21, 2012

ela
The narrator points out that Emily, who has only recently blossomed, struggled with her appearance in the past. What this means..
September 20, 2012

an acid with the equilibrium concentration is listed below: 1) HA + H2O = H3O^+ + A- HA= 10^-1 M, H3O=10^-3M, A=10^-3M Calculate the Ka and pKa for the acid. Ka=[10^-3][10^-3] / [10^-1] = 1.00 X 10^-5 pKa = -log[1.00 X 10^-5] = -1.00 Did I do this correctly for the Ka and pKa?
September 20, 2012

List the conjugate base for the following acids: 1) Acid = CH3CH2CH2NH3^+ Conjugate base = CH3CH2CH2NH2^- 2) Acid = CH3CH2CH2OH2^+ Conjugate base = CH3CH2CH2OH^- Are my answers correct? Thank you!
September 20, 2012

September 17, 2012

I was using this equation as an example to try to help myself understand something but I think I may have set it up incorrectly. What I am trying to do is find the y max of a projectile using the equation y = yo + (vo sin Q ) t -1/2gt^2. I keep plugging in my values for the ...
September 17, 2012

Yes but I always set it up incorrectly. so [76.95 +/- sqrt (76.95^2 - 4(4.9)(-1.5)] / 9.8 Did I set this up correctly?
September 17, 2012

y=1.5 + 76.95t-(1/2)(9.8)t2 = 303.6 I am not sure how to arrive at this answer. I am confused because there is a t and a t^2. Thank you for your help!
September 17, 2012

physics
A motorboat accelerates uniformly from a velocity of 6.6 m/s to the west to a velocity of 1.3 m/s to the west. If its acceleration was 2.1 m/s2 to the east, how far did it travel during the acceleration? Answer in units of m.
September 17, 2012

physics
A motorboat accelerates uniformly from a velocity of 6.6 m/s to the west to a velocity of 1.3 m/s to the west. If its acceleration was 2.1 m/s2 to the east, how far did it travel during the acceleration? Answer in units of m.
September 17, 2012

This is the same equation as before just with different numbers. y=yo + (vo sin Q) t - 1/2gt^2 This time the numbers are: 0 = 1.005 + (3.021 sin 30)t - 1/2(9.8)t^2 4.9t^2 - 1.5105 - 1.005 = 0 This is the part where I am stuck. Did I do this correctly? sin 30 = 0.50 X 3.021 = 1...
September 15, 2012

How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am not sure what to do with these values. Physics - drwls, Saturday, September 15, 2012 at 1:29am Define your terms. I have no idea what you are talking...
September 15, 2012

How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am not sure what to do with these values.
September 14, 2012

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