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December 21, 2014

Posts by Hannah


Total # Posts: 2,923

chemistry
sulfur dioxide (g) + oxygen (g) sulfur trioxide (g) SO2 + O = SO3 Is this correct for the balanced equation?
November 20, 2011

chemistry(Urgent Please help)
A student is asked to standardize a solution of barium hydroxide. He weighs out 0.945 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 33.9 mL of barium hydroxide to reach the endpoint. A. What is the molarity of the barium hydroxide ...
November 20, 2011

Chemistry
A 8.71 g sample of an aqueous solution of hydroiodic acid contains an unknown amount of the acid. If 25.0 mL of 0.388 M barium hydroxide are required to neutralize the hydroiodic acid, what is the percent by weight of hydroiodic acid in the mixture? I understand how to solve ...
November 20, 2011

speech
I am doing a persuasive speech on why you should foster a dog or cat. but I am not sure what my three main points should be. do you guys have any idea?
November 19, 2011

Chemistry
I am doing similar homeowrk and I was wondering how you calculate the ph after the equivalence point?
November 17, 2011

History
diary + the poems he wrote
November 17, 2011

History
so was his main contribution when he fuoght with the french or the diary that he kept that showed what the war was like?
November 17, 2011

History
What was Alan Seeger do that made an impact during WWI?
November 17, 2011

Chemistry
For a lab experiment we have to draw the lewis structures of hydrides. 1) Carbon It asks for the formula of hydride. Total # of valence electrons and the lewis structure. Total electrons would be four. I am not sure what the formula would be or how to find that and and the ...
November 16, 2011

Chemistry
The compound butane, has two structures. They have the same molecular formula but different arrangements of bonds in their structures. As a result, they can have different chemical and physical properties. Draw the lewis structures of all the isomers of pentane, C5H12. I am ...
November 16, 2011

geometry
why do elephants have pointy tails
November 14, 2011

Math
Your friend states that your mortgage is "an annuity where you are the bank."What does she mean?
November 10, 2011

Chemistry
Is the structure for chlorous acid H O Cl O or H Cl O ? O I was thinking that both could be correct but I am not 100% sure.
November 9, 2011

Chemistry
Is the structure for chlorous acid H O Cl O or H Cl O ? O I was thinking that both could be correct but I am not 100% sure.
November 9, 2011

physics
Two dogs pull on a toy. One pulls with a force of 10 N, the other with a force of 15 N. (a) In what relative directions can the dogs act to give the toy the smallest acceleration?
November 8, 2011

english
where in the book The Importance of Being Earnest does the author make fun of the victorian value of Social Responsibility?
November 7, 2011

Chemistry
We have to conduct a lab experiment for a photochemical reaction. We will be using a redand violet film and filter paper labeled 40W and 60W. On each piece of paper we will add 1 drop of NaCl and AgNO3 and then let it sit under a lamp to see what happens. At the end we will ...
November 2, 2011

Chemistry
ok thank you I apprieciate all of your help!!
November 2, 2011

Chemistry
In the cchemistry lab we conducted an experiment called atomic spectroscopy. We had to find the color, energy, wavelength, and 1/lamda for Hydrogen, neon, and mercury. For hydrogen: red 1.90ev 650nm 1.54e^-3 red 2.02ev 610nm 1.64e^-3 green 2.30ev 545nm 1.83e^-3 for neon: green...
November 2, 2011

Chemistry
1) What is the charge on the ion that Selenium forms in an ionic compound? I am not sure about this. 2) What noble gas is isoelectronic with this ion. I was thinking Krypton because it is a noble gas and it is the closest to Selenium but I am not sure. 3) What other ions are ...
November 2, 2011

Chemistry
ok where do you get those numbers from?
November 2, 2011

Chemistry
for chose 5 Ca is next to K and above Sr so wouldnt Sr be greater?
November 2, 2011

Chemistry
1) A Cobalt (II) ion has the electron configuration ____? and is ____? The answer choices were: [Ar] 3d5 4s2 diamagnetic [Ar] 3d7 paramagnetic [Ar] 3d5 4s2 para [Ar] 3d7 dia None of these I chose [Ar] 3d5 4s2 diamagnetic 2) Choose the corect statement concerning ionization ...
November 2, 2011

Chemistry
Thank you for your help!!!
November 1, 2011

Chemistry
1) What is the atomic # for selenium? 34 2) Write the full electron configuration for selenium following the (n+l) rule? I am not sure what is meant by n+l 3) write the electron configuration, grouping electrons by their "n" values. [Ar]3d10 4s2 4p4 Are these correct...
November 1, 2011

Chemistry(Please check)
Thank you!
November 1, 2011

Chemistry(Please check)
1)For an atom of carbon how many valence electrons are "s" electrons? 2 2) How many are "p" electrons? 4 3)How many (total) electrons in carbon are paired? 2 4) How many are unpaired? 1 Are these correct.
November 1, 2011

chemistry
Based on the nl designation and max # of electrons above, write the electron configuration for carbon. 1s2 2s2 2p2 or [He]2s2 2p2 How many electrons are in the first shell n=1? These are the core electrons for carbon. I think two are in the first shell How many valence ...
November 1, 2011

chemistry
the question then says to expand the above values in the table for all the l values of n=4. Are more possible for n=5? I am not sure what they mean by expand it but I think that there are more values for n=5.
November 1, 2011

chemistry
ok so for n=3 and l value 0 it would be the the nl would be 3s and max electrons would be 18?
November 1, 2011

chemistry
o ok. In my textbook it shows a chart with electron shells and it has the maximum electrons possible for nth shell (2n^2). What does this mean?
November 1, 2011

chemistry
So for the following: 1)n=2 2) l=0 3) l letter= s 4) nl designation= 2s Are numbers 2 and 3 correct?
November 1, 2011

chemistry
o ok i think i understand and what would the maximum number of electrons be?
November 1, 2011

chemistry
write the corresponding subshell leters for the combinations given. Fill in the possible number of electrons for these subshells. 1) n=1 2) l value=0 3) l letter? 4) "nl"Designation 5) Maxium # of electrons the table shows n values of 1, 2,2,3,3,4 with l values of 0,...
November 1, 2011

Chemistry
In the cchemistry lab we conducted an experiment called atomic spectroscopy. We had to find the color, energy, wavelength, and 1/lamda for Hydrogen, neon, and mercury. For hydrogen: red 1.90ev 650nm 1.54e^-3 red 2.02ev 610nm 1.64e^-3 green 2.30ev 545nm 1.83e^-3 for neon: green...
November 1, 2011

Chemistry
In the cchemistry lab we conducted an experiment called atomic spectroscopy. We had to find the color, energy, wavelength, and 1/lamda for Hydrogen, neon, and mercury. For hydrogen: red 1.90ev 650nm 1.54e^-3 red 2.02ev 610nm 1.64e^-3 green 2.30ev 545nm 1.83e^-3 for neon: ...
November 1, 2011

Chemistry
on the x axis was 1/wavelength (nm-1) and the y axis was energy(ev). The line for both graphs of neon and hydrogen was positive. So would I pick two points on the graph to find the slope and then do h=slope/c?
October 31, 2011

Chemistry
In the cchemistry lab we conducted an experiment called atomic spectroscopy. We had to find the color, energy, wavelength, and 1/lamda for Hydrogen, neon, and mercury. For hydrogen: red 1.90ev 650nm 1.54e^-3 red 2.02ev 610nm 1.64e^-3 green 2.30ev 545nm 1.83e^-3 for neon: green...
October 31, 2011

Chemistry
Consider the last electron in B: Values for n,l,and ml of 2,0,0 cannot be used. Why not? so is this the same answer as lithium. The ground stat cant have l=2 since it has no p electrons? Are values of 3,0, 0 allowed? Why or why not? I would say no for the same reason. Are ...
October 31, 2011

Chemistry
What are the n,l,ml,and ms values for the last electron in Be?
October 30, 2011

chemistry
Consider the last electron in Li: Values n,l,ml,and ms of 1,1,0, +1/2 are not allowable. Why not. I do not understand this question. I am not sure what the values for the last electron would be.
October 30, 2011

Chemistry
Electron Configuration: What numerical values of l are possible for n=4. 1,3,5,7 what ae their corresponding letters. s,p,d,f Are these correct?
October 30, 2011

Chemistry
o ok thank you!!
October 30, 2011

Chemistry
Thank you and sorry. Sometimes it does not show up on my computer when someone answers.
October 30, 2011

Chemistry
Write the n, l, ml, and ms values for the first two elements, H and He. H: n=1 l=0 ml=0 ms=+1/2 He: n=1 l=0 ml=0 ms=+1/2 for the first electron for the second: n=1 l=0 ml=0 ms=-1/2 Are these correct?
October 30, 2011

Chemistry(Please check)
Write the n, l, ml, and ms values for the first two elements, H and He. H: n=1 l=0 ml=0 ms=+1/2 He: n=1 l=0 ml=0 ms=+1/2 for the first electron for the second: n=1 l=0 ml=0 ms=-1/2 Are these correct?
October 30, 2011

Chemistry
ok thank you!!
October 28, 2011

Chemistry
For each l value indicate the ml values allowable? l=1 ml=+1, 0, -1 l=2 ml=+2,+1,0,-1,-2 l=3 ml= everything from +3 to -3 l-4 ml= everything from +4 to -4 Are these correct? What are the ms values allowable? These I am not sure about. Is it the number of orbitals?
October 28, 2011

Chemistry
Quantum numbers: What are the n values that are allowed? I put 1,2,3,4, etc. For the first four of these, indicate the l values allowed. n=1 l = 0 n=2 l = 0,1 n=3 l = 0,1,2 n=4 l = 0,1,2,3 Are these correct?
October 28, 2011

derivatives
How do you find the derivative of (6 csc x)/x?
October 28, 2011

derivatives
I know. I just realized that I messed up what goes where when I was doing it myself. My problem is applying it to other problems, esp when i also have to use the quotient or product rule.
October 27, 2011

derivatives
Thanks. My teacher told us we need to use the chain rule in these problems, and i'm having trouble figuring out when and where to use it.
October 27, 2011

derivatives
how do u find the derivative of (csc x)^7 -cos 4x???
October 27, 2011

Calc
to find an arcsin you would just have to memorize the unit circle right? so arccos of -sqrt3/2 is 5pi/6?
October 26, 2011

Calc
oops mixed up 2 questionss haha
October 26, 2011

Calc
How do you do the derivative of an inverse trig function? arcsin (sqrt2/2)??
October 26, 2011

Chemistry
yes thank you i understand the parts for moles of KHP and NaOH. So the mw of KHP was given to me which was 204.44g/mol so for moles of KHP i did 1/204.44 and got 0.004 and then for NaOH i got 0.004 as well. Then for the concentration of NaOH would i do 0.004/0.0145 and 0.004/0...
October 26, 2011

Chemistry
For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass of KHP, initial ...
October 26, 2011

Chemistry(Please help, thank you!!)
Thank you!!
October 25, 2011

Chemistry(Please help, thank you!!)
ok i do not understand at all but thank you for your help.
October 25, 2011

Chemistry(Please help, thank you!!)
SO would it be 27.80 / 10.00?
October 25, 2011

Chemistry(Please help, thank you!!)
Determine the concentration of a NaOH solution if 27.80mL of NaOH is required to neutralize 10.00mL of a 1.00 M H2SO4 solution. (Hint:Review monoprotic vs. diprotic acids.) would I do (27.80)(10)? Thank you for your help!!
October 25, 2011

Chemistry(Please help, thank you!)
ok so for mole of kHP it would be 1/204.44 = 0.00489 g/mol? The volume of NaOH for trial 1 was 14.50 mL and for trial 2 it was 9.90mL. So would it be 39.998 which is molecular mass of NaOH divided by the volume?
October 24, 2011

Chemistry(Please help, thank you!)
For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass of KHP, initial ...
October 24, 2011

Geology
For my final I am to write a paper discussing the following : Select some product produced in your city or state that is made from earth, mineral, or energy resources. One example would be the tar paper used as a building material. (Do not use this example). Prepare a 700- to ...
October 23, 2011

Chemistry
Thank You!!!
October 23, 2011

Chemistry
A concept map was to be created on acids and bases. The concept terms that were given to use were: aqueous solution,bases,acids,ions,weak bases, strong bases, strong acids, weak acids,dissociation, weak electrolyte, strong electrolyte,reaction,salt, neutralization, hydronium ...
October 23, 2011

Chemistry(Please help!!)
For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass of KHP, initial ...
October 23, 2011

Science- physics
Thank you so much! My teacher has NO idea how to teach us anything! I really appreciate your help! Thanks <3
October 23, 2011

Science- physics
How much does a 20ft x 10ft x 8ft swimming pool filled with water weight? Assume the water has a weight density of 62 lbs/ft3. I know the answer is 99,200 pounds but how do I get that answer? Thanks<3
October 23, 2011

Science- physics
An aluminum bar weighs 17 pounds in air. How much force is required to lift the bar while it is immersed in gasoline? The weight of aluminum is 170 pounds/ft3 and that of gasoline is 42 pounds/ft3. I know that the answer is 12.8 pounds but how do I get to that answer? Thanks<3
October 23, 2011

Science- physics
An iron anchor weighs 250 pounds in air and has a weight density of 480 lbs/ft3. If it is immersed in sea water that has a weight density of 64 lbs/ft3, how much force would be required to lift it while immersed? I know the answer is 217 pounds but I need help on trying to get...
October 23, 2011

Science- physics
A balloon weighing 80 kg has a capacity of 1200 m3. If it is filled with helium, how great a payload can it support? The density of helium is 0.18 kg/m3 and the density of air is 1.30 kg/m3. Express your answer in Newtons. I know the answer is 12, 400 Newtons I just don't ...
October 23, 2011

Science
The formula for density is... density= mass/volume So yes you would divide 6773 g/500 mL!
October 23, 2011

Chemistry
For my first trial KHP was 1.00g and for the second trial it was the same. So to find moles of KHP would I do 204.44g/mol X 1/1g which would be 204.44g/mol?
October 23, 2011

Chemistry
For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass of KHP, initial ...
October 23, 2011

Chemistry
Write a net ionic equation for the overall reaction that occurs when aqueous solutions of potassium hydroxide and carbonic acid are combined. KOH + H2CO3 = KCO3 + H30 K^+(aq) + OH^-(aq) + h2CO3 (aq) = K^+(aq) + CO3^2+(aq) + H3O(aq) Is this correct so far?
October 22, 2011

science
If a scientist changes two variable he/she would not know which change would increase or decrease his/her theory or hypothesis. The scientist wants to determine one thing that changed it the most not two things!
October 20, 2011

Ap chem
When .4000 g of CH4 is burned in excess oxygen in a bomb calorimeter that has a heat capacity of 324, the temperature increases 6.795 degrees celsius. How much energy is released? (in kJ/mol CH4)
October 20, 2011

Science
A container with equal sides of 8 cm is filled with 1200g of fluid. What is the force in Newtons on the bottom of the container?
October 20, 2011

math
a rectangle has an area of 330m^2 , one side is 7 m longer than the other what are the dimensions of this rectangle
October 20, 2011

Math
Simplify a)(1-ã3)(2+ã6)(5+ã2) b) -5ã45+ã52+3ã125
October 19, 2011

5th grade math
seventy five multiplied by one hundred twenty
October 19, 2011

science
how long does a teenager need to sleep at night?? my teacher asked this question and if you get it right, you get 2 extra points on a test, so please help me!!
October 17, 2011

Physical Education
P.E. is a time to achieve physical activity. To obtain a healthy living style you should exercise for 60 min a day. Most kids/teenagers would probably not chose to do that therefore schools decided to include that needed exercise in the kids' school time.
October 17, 2011

Spanish
I'm in the 8th grade and I have been taking French now for about a 1 1/2. I have learned many things and it is probably the easiest way to learn about another country! salut! (thats goodbye in french btw)
October 15, 2011

Chemistry
The empirical formula for Brilliant Blie dye is C37 H34 N2 O9 S3 Na2, and the formula weight is 792.86 g/mol. How would you prepare a 4.73 X 10^-6 M solution of Brilliant Blue dye? How many grams of the dye do you need to add to a 1.00 L of water to make this solution? I have ...
October 12, 2011

Chemistry
To calculate the percent error you would use the error in measurement divided by accepted value times 100 correct? So for an experiment in which you had to find the concentration of a dye in a powdered drink solution, to find the percent error would you use the number you ...
October 12, 2011

Chemistry
A sample of 30.0 mL of sulfuric acid solution was titrated with 0.720 M KOH. It was found that 46.9 mL of the base was needed to neutralize the acid. What is [H2SO4]? would you do (30.0)(0.720) / 46.9 ?
October 12, 2011

Chemistry
What volume of o.410 M HNO3 would you need to neutralize 18.75mL of 0.376M Ba(OH)2? Would you do (0.410)(18.75) / 0.376? Or (0.410)(0.376) / 18.75
October 11, 2011

Chemistry
Oh ok thank you!
October 11, 2011

Chemistry
If 7 mL of water is added to 3 mL of a 0.50 M KOH solution, the concentration of KOH is changed to? I am not sure how to go about doing this. Please help, thank you!!! Would I do (7)(3) / 0.50?
October 11, 2011

Chemistry
so would it be Mg3N2 + H2O -> 2MgOH + NH3
October 9, 2011

Chemistry
Write the balanced equation for: Magnesium nitride + water -> magnesium hydroxide + ammonia MgNO2 + H2O -> MgOH + NH3 Is this correct?
October 9, 2011

Chemistry
thank you!
October 9, 2011

Chemistry
Would this be correct for the complete equation? Ba^2+ + OH^- + H^+ + Br^- = Ba^2+ + Br^- + H2O
October 9, 2011

Chemistry
Write the net ionic equation for the reaction that occurs when aqueous solutions of barium hydroxide and hydrobromic acid are combined. I know that the first part of the formula would be BaOH + HBr but I do not know what the product would be since HBr is one thing. I do not ...
October 9, 2011

Language
What do these sets of words have in common?(Hint: Look for a sound, a keyboard, or the way they are written.) BCDEGPV QWERTYUIOP ij
October 6, 2011

Language
What do these sets of words have in common?(Hint: Look for a sound, a keyboard, or the way they are written.) BCDEGPV QWERTYUIOP ij
October 6, 2011

english
Where is pride and prejudice does mr. bennet confess that he married mrs. bennet because of her looks? a volume and chapter would be great:) I know the page numbers will be different in eat edition.
October 6, 2011

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