Friday
December 19, 2014

Posts by Alexis


Total # Posts: 681

Chemistry
Can a buffer solution with pH = 4.70 be prepared using water, 6.0 M HC2H3O2 and 6.0 M NaOH? Justify your answer. Ka = 1.8 x 10-5 for HC2H3O2 , K = 1.0 x 10-14 .
August 6, 2008

chemistry
What are the equilibrium concentrations of H+,OH- ,(HSO3)-, (SO3)2- and Na+ in the solution that results from combining 50.0 mL of 0.200 M NaHSO3 with 50.0 mL of 0.600 M Ba(OH)2 ? Ka1 = 1.5 x 10-5 and Ka2 = 1.0 x 10-7 for H2SO3 does it matter that Ba(OH)2 has 2 OH's?When ...
August 3, 2008

chemistry
To a 100 mL volumetric flask were added 5.00 mL of 6.0 M NH3 , 14.5g of solid ammonium iodide, and 40.0 mL of 0.50 M NaOH. The flask was filled to the calibration mark with water. (a) What were the molar concentrations of hydrogen ion, hydroxide ion, and ammonium ion in the ...
August 3, 2008

chemistry
do you have to figure out what z is in order to show the bronsted-lowry equation?
August 3, 2008

chemistry
The pH of 100 mL of a 0.10 M aqueous solution of Compound Z is 11.30. (a) Is Z an acid, a base, neither, or cannot be determined? Justify your choice. (b) Write the relevant Bronsted-Lowry equation showing how Z behaves in aqueous solution
August 3, 2008

chemistry
What is the pH of 100 mL of 0.10M NH4 Cl? K = 1.8 x 10-5 for NH3 ?
August 3, 2008

chemistry
If K = 1.8 x 10 for HC2H3O (aq) <=> H+(aq)+C2H3O2-(aq), and 100 mL of aqueous solution has [HC2H3O2] = 0.50 M, [H+] = 0.090 M, and [C2H3O2-] 0.0010 M, is the system at equilibrium?
July 27, 2008

chemistry
Consider the balanced equation 2A(g) + 3G(g) „\ 2X(g) + Z(g). To a 20.0 L container maintained at a temperature of 127 C were added 0.200 mol of A, 0.500 mol of G, 0.400 mol of X, and 0.600 mol of Z. After equilibrium was established, it was found that 0.340 mol of X was ...
July 27, 2008

chemistry
If K = 1.8 x 10 for HC H O (aq) „\ H (aq) + C H O (aq), and 100 mL of aqueous solution has [HC H O ] = 0.50 M, [H ] = 0.090 M, and [C H O ] 0.0010 M, is the system at equilibrium?
July 27, 2008

chemistry
why? aren't they all polar, does it depend on how polar each compound is?
July 21, 2008

chemistry
Polymers are high molecular weight compounds with a repeating structural unit. Polystyrene has the formula (CH CHZ) , where Z is C H and n is an integer. where n is 576 A solution of polystyrene in a solvent is prepared. Would you select H O, ethanol (CH CH OH), or toluene (C ...
July 21, 2008

chemistry
Consider a set of compounds called carboxylic acids which have the general formula CH3(CH2)nCO2H. As the value of n in the formula increases from zero to 10, what happens to the solubility of these compounds in water? What happens to the compounds solubility in carbon ...
July 21, 2008

Volume
I had taken the 7ft cubed as 7 cubed. Not knowing the difference in the two. I'm only 5th grade.
May 13, 2008

Volume
A plant manager built a storage container that is 4 yd long, 10yd wide, and 2 yd tall to store foam reanuts. If the manager purchases bags that contain 7FTcubed of peanuts how many bags of peanuts will it take to fill the container? I converted the yd's to ft and ...
May 13, 2008

Volume
So, the symbol 7ft cubed is different than 7 cubed? I'm only a 5th grader sorry.
May 13, 2008

Volume
A plant manager built a storage container that is 4 yd long, 10yd wide, and 2 yd tall to store foam reanuts. If the manager purchases bags that contain 7FTcubed of peanuts how many bags of peanuts will it take to fill the container? I converted the yd's to ft and ...
May 13, 2008

Volume
A plant manager built a storage container that is 4 yd long, 10yd wide, and 2 yd tall to store foam reanuts. If the manager purchases bags that contain 7FTcubed of peanuts how many bags of peanuts will it take to fill the container? I converted the yd's to ft and ...
May 13, 2008

math
grahaping y=3
May 4, 2008

math
what is liquid quanity
April 28, 2008

math (pre clac)
so its this picture of a rectangle inscribed in a circle. the circle has a radius of 2. the vertexes of the circle are present in every quadrant, but you cant tell exactly whgat point they represent. point Q (x,y) is the vertex of the rectangle in Quadrant I and is on the ...
April 25, 2008

AP HISTORY
thank you!
April 14, 2008

AP HISTORY
Who were most slaves in the South owned by?
April 14, 2008

AP HISTORY
What was the least common and least sucessful form of slave resistance pre civi war?
April 14, 2008

math riddle ALGEBRA WITH PIZZAZZ
Did you hear about the.. Algebra 15.7
April 6, 2008

dog behavior
please check my answer True or False The following statement describes classical conditioning. It involves the pairing of a conditioned stimulus with an unconditoned stimulus I say True
April 4, 2008

science
the cause and effect of hibernating bears
March 25, 2008

ALGEBRA 1
factor the trinomial 6a to the second power + 5a +1
March 19, 2008

English 12
How do u change a transitive verb into a intranstivie verb?
March 6, 2008

science
what is germination
February 24, 2008

geometry
Rotation transformation
February 21, 2008

geometry
Samantha has a dog that loves to chase flying disks. To keep her disk sperate form other disks, Samantha painted a triangle on it, with one point of the triangle in the center of the disk. As she throws the disk for the dog, what two transformations does the triangle undergo? ...
February 21, 2008

geometery
Samantha has a dog that loves to chase flying disks. To keep her disk sperate form other disks, Samantha painted a triangle on it, with one point of the triangle in the center of the disk. As she throws the disk for the dog, what two transformations does the triangle undergo? ...
February 21, 2008

maths
help math
February 17, 2008

social studies
you would be more likely to see a rose stained glass window in what style of church? a. gothic b. romanesque c. byzantine
February 14, 2008

Math
i need help writing an equation of the line that has each pair of intercepts x-intercept: -3, y-intercept: 6
January 29, 2008

math
but its most likely two lines that do not intersect but are not parallel
January 29, 2008

math
i think its a line segment
January 29, 2008

This is for alex, who had needed help with biology
Hey buddy, so I found my notes and I will post for you tomorrow, if you still need me to do so. Let me know if you still need them. I haven't looked over them in detail, so I can't ensure that they will answer everything you needed help with, but I am sure they will be...
January 1, 2008

Film and Physics
And now, you have me puzzled. Thanks anyways, I appreciate it!
December 31, 2007

someone plz help me...thx
Well said, that helps me too!
December 31, 2007

biology
I think I found them, but I need to read over them to see if they are correct. I will try and post for you tomorrow sometime! Have a happy new year and goodluck!
December 31, 2007

biology
Awe, this sucks, I hate when that happens. I am trying to find my book though. When do you need this homework by? Just before you go back to school, yes? I think I should be able to find it soon, so just keep checking back.
December 31, 2007

biology
Shouldn't this stuff be in your notes? I can't find mine from last year, so I can't give you specific answers, because I don't want to tell you the wrong thing. But, I believe this information should be in your text book. Try looking there in case no one else ...
December 31, 2007

Math
i need to Get help with algebra-understanding word problems.
December 10, 2007

AP HISTORY
what branch of gov. is responisble for the establishment of lower federal courts?
December 5, 2007

AP HISTORY
acordung to the constitution, hiw often is the numer of congressional districts per state determined?
December 5, 2007

AP HISTORY
which branch of government establishes lower federal courts?
December 5, 2007

AP HISTORY
acordung to the constitution, hiw often is the numer of congressional districts per state determined?
December 5, 2007

math
I am answering questions concerning equity, the problem is a story problem, and it concerns a couple who bought a 129000 home, and then borrowed 107,000 at 7.25% for 30 years. A) How much equity does the couple have in their home before they make their first mortgage payment? ...
December 5, 2007

Pigskin geography
Oakland*
November 19, 2007

Pigskin geography
#18.Name a huge lake the Qakland Raiders will fly over en route to their game. PLEASE HELP!!!!!
November 19, 2007

Pigskin geography
4.Beyond the 30! Two competing teams are from cities that share a rich heritage from the same European country.
November 14, 2007

Pigskin geography
please help
November 14, 2007

Pigskin geography
the question is....The falcons could drive to their game on I-__"the backbone of peidmont"
November 14, 2007

Pigskin geography
4 and 5
November 14, 2007

Pigskin geography
i need all the numbers for pigskin geography week 10 2007
November 14, 2007

Just a repost, in case the old isnt seen
HAHA I just got the answer!!!! You don't use F=mg it should be ma!!! Thanks anyways!!
October 14, 2007

Just a repost, in case the old isnt seen
sorry! I never noticed..the mass should be 52000kg sorry about that! For Further Reading physics repost - Alexis, Sunday, October 14, 2007 at 6:07pm so it should be a 52000kg train slows from 25 m/s to 14m/s in 5.0 s. Calculate the work done on the train. so I found the ...
October 14, 2007

physics repost
I tried to get the answer using the kinetic energy formula, and it works (for the answer of 1.1x10^7), but the only problem is, the homework is for the pages before the kinetic energy, so I would like to know how to figure out the answer without the kinetic energy formula. ...
October 14, 2007

physics repost
so it should be a 52000kg train slows from 25 m/s to 14m/s in 5.0 s. Calculate the work done on the train. so I found the displacement by using displacement= 1/2 (v1+v2) (delta t) and got 97.5 and then I found the force which is F=mg and got 510120N, then took that force and ...
October 14, 2007

physics repost
sorry! I never noticed..the mass should be 52000kg sorry about that!
October 14, 2007

Physics
A train slows from 25m/s to 14m/s in 5.0s. Calculate the work done on the train....so I calculted the displacement and the force and put them together to get an answer of 5.0 x 10^7J, but my textbook says it should be 1.1 x 10^7J? Am I right, or is the textbook? Merci beaucoup!
October 14, 2007

english
Which is the most valid conclusion regarding the theme of the passage?
October 9, 2007

english
The effect of the last phrase of the passage, "it is very cold," depends mainly on
October 9, 2007

ALGEBRA 1
after finding distance and midpoint.. how do you find the equation of the line?
September 9, 2007

AP world history
thank you so much
September 6, 2007

AP world history
What are "sectional interests" as cited in Washington's farewell address in 1796
September 6, 2007

Patterns and Relationships
1. Which rule is correct for the following: 2,8,20,44 a. yx2+2 b. y+4x2 c. y+3x3 d. y+2x2 2. Which fraction does not belong in the pattern? 1/5, 2/10, 3/15, 4/25 it is D. i believe. the pattern of the first three in 2 it can be reduced to 1/5 (all of them). The last one cannot...
April 19, 2007

Linear Measurements
what is the answer to this?0.18meters = how many cm
March 11, 2007

chmistry
When 0.633 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 103C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant figures. Do not ...
February 12, 2007

1st grade homework question
can the earths minerals be all used up or do they regrow?? That question has been answered just a few posts below. If you can't find it, please repost.
December 11, 2006

SCIENCE
WHAT HAPPENS IF EARTH'S MINERALS ARE USED UP? Will more grow or will there be no more Some minerals are being formed all the tme; others are not and will die out, so to speak, or be redustributed and any one site will be too small to pay to mine. Personally, I doubt that ...
December 11, 2006

Pigskin Geography
wat are the answers for week 10?
December 9, 2006

biology
I need pictures of molecular structures like Adenine to draw 4 homework search google images using the name of the structures you have to draw... http://images.google.com/images?&num=10&hl=en&btnG=Google+Search&lr=&as_ft=i&as_qdr=all&as_dt=i&as_rights=&safe=off&ie=UTF-8&oe=UTF...
November 14, 2006

Biology
How does the interaction between a carrier protein and the substance it transports resemble the interaction between an enzyme and its substrate? Use the Fit model on this.
October 26, 2006

pigskin
what is the question to pigskin week 4
October 18, 2006

Math vocab
What does distance/time/rate of speed mean?? Its all one word AND IM SOO CONFUSED! Movement? I am confused also. Rate of speed is not a common term. Speed is rate of motion , or rate of change of distance per time. i need help on my math vocab what is a sector What is the ...
October 4, 2006

social studies
What are the three main types of resources used for making, selling, and using goods and services? a. soil, water,air b. money, barter, credit c. natural, human, capital d. gold, silver, broze This is a double post.
September 11, 2006

social studies
What are the three main types of resources used for making, selling, and using goods and services? a. soil, water,air b. money, barter, credit c. natural, human, capital d. gold, silver, broze c.
September 11, 2006

How far of the Taurus form Earth?
i learnd that taurus bull is 68 light years away from earth.
August 21, 2005

siecnce
f ou y ve el be ha rs
June 14, 2005

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