Wednesday
May 25, 2016

Posts by Tara

Total # Posts: 357

chemistry
the molar solubility of PbS, in a 0.150 M ammonium sulfide (NH4)2S solution is? The Ksp for PbS= 3.2E-28.
December 15, 2010

chemistry
calculate the pH of a 1.94M solution of nitrous acid (HNO2 - ka = 4.5E-4).
December 15, 2010

chemistry
the activation energy is 31.7kj/mol. if the reaction rate is 7.4E-2 at 35.0 degrees c, what is the reaction rate constant at -55.0 degrees c.
December 15, 2010

chemistry
for a given reaction, the activation ener
December 15, 2010

chemistry
I am doing a boiling point problem and dont know the value of i for the equation delta T = i(kb)(m) solution contains 45.0g caffeine in 25.0 g benzene.
December 15, 2010

chemistry HELP
laboratoories order hydrochloric acid as a concentrated solution (e.g. 36% W/V). what initial volume of concentrated laboratory hydrochloric acid should be diluted to prepare 5.00L of a 0.12 mol/L solution for an experiment? plz can someone show me how to do it step by step...
December 9, 2010

chemistry need help plzzz tomorrow is a TEST!!!
phosphoric acid is the active ingredient in many commercial rust-removing solution.calculate the volume of concentrated phosphoric acid (14.6 mol/L)that must be diluted to prepare 500mL of a 1.25 mol/L solution. how can i calulate the volume cocentration for this question.... ...
December 9, 2010

art
no he is a composer
December 7, 2010

Chem, LAST ONE PLEASE HELP!
Even the correct formula to use would be a HUGE help!
November 24, 2010

Chem, LAST ONE PLEASE HELP!
consider the reaction: CO(aq) + Cl2 (aq) --> COCl2 (aq). Calculate Delta G at non standard conditions. T = 298.15K. Concentration of COCl2 is reduced to 0.01832 M while the concentrations of CO and Cl2 remain 1M. Delta G rxn = -67.4 kj.
November 24, 2010

chemistry
why is this reaction spontaneous? Mg + 2Cu2+ --> Mg2+ + 2Cu+ Mg2+ + 2e --> Mg E= -2.37 V Cu2 + e --> Cu+ E= 0.15 V
November 24, 2010

chemistry
Thank you! This helped a lot!
November 24, 2010

chemistry
For the voltaic cell Cr(s)/Cr3+(aq)//Ni+2 (aq)/Ni(s), list the reactions at the cathode, anode, and the overall net reaction.
November 24, 2010

chemistry
For a certain reaction, Delta H(not) = -76.8 kj and delta S(not) = -217 j/k. If n =3, calculate E for the reaction at 25degrees celcius.
November 24, 2010

chemistry
For a certain reaction, Delta H(not) = -76.8 kj and delta S(not) = -217 j/k. If n =3, calculate E for the reaction at 25degrees celcius.
November 22, 2010

Chemistry
For the voltaic cell Cr(s)/Cr3+(aq)//Ni+2 (aq)/Ni(s), list the reactions at the cathode, anode, and the overall net reaction.
November 22, 2010

chemistry
assuming the following reaction proceeds in the forward direction, what is oxidized and what is reduced? Cu2+ (aq) + Ca(s) --> Cu (s) + Ca2+ (aq)
November 22, 2010

chemistry
consider the reaction: CO (aq) + Cl2 (aq) --> COCL2 (aq). Calculate Delta G at non standard conditions for the reaction at 298.15k, if the concentration of COCl2 is reduced to 0.01832M, while the concentrations of CO and cl2 remain at 1M. Delta G rxn = -67.4kj.
November 22, 2010

chemistry
Calculate the Delta G(not) for the reaction: C(s) + CO2 (g) --> 2 CO Delta Gf : CO2 = -394.4 kj/mol Delta Gf : CO = -137.2 kj/mol
November 22, 2010

Math
((6-6)x6)+6/6 = 1
November 22, 2010

UNIVERSITY COMPOSITION AND COMMUNICATION I (AXIA)
I start this class in about a month i just want to know a little bit about it
November 17, 2010

Math
If B is the midpoint of line AC, D is the midpoint of line CE, and line AB is congruent to line DE, then AE equals 4AB
November 16, 2010

math
837 divided by f = 31
November 11, 2010

Physics
If you lift a 57.7kg box 2.41m over your head, how much work did you do?
November 10, 2010

algebra
Use the method of substitution to solve the system. xy=1 4x-y+3=0
October 28, 2010

chemistry
Thank you for all of your help DrBob!!!!
October 27, 2010

chemistry
When 2.53 g of NaOH(s)(40.0g/mol) dissolves in 100.0 g of water, the temperature of the solution changes from 20 degrees C to 26.3 degrees C. Calculate qrx in KJ/mol specific heat of the solution is 4.18 J/(g*K)
October 27, 2010

chemistry
When an evacuated glass bulb at 75.0 ml volume is filled with a gas at 25.3 degrees C and 747 mm Hg, the bulb gains 0.0114g. The gas is?
October 27, 2010

chemistry
What volume will 0.35 mol of Ar occupy at -10 degress C and 0.96 atm?
October 27, 2010

chemistry
no there is no melting or boliling point given.
October 27, 2010

chemistry
Ethylene glycol (antifreeze) has a specific heat of 2.42 J/(g*K). Calculate q when 3.65 kg of ethylene glycol cools from 240 degrees C to 78 C
October 27, 2010

Chemistry
How many L of O2 are produced when 2.53 g of KClO3 (122.55g/mol) reacts at 0.934 atm and 354 K?
October 27, 2010

Chemistry
We have 250. ml of He at 2.56 atm and 25 degrees C. What is the final volume if we heat the sample to 150 degrees C while we compress the volume to 100. ml
October 27, 2010

Chemistry
A 0.10 M solution of a weak acid has a pH of 3.5 at 25%C. What is the equilibrium constant, Ka, for this acid?
October 10, 2010

Chemistry
Thank you !
October 6, 2010

Chemistry
Phenylcarbinol is used in nasal sprays as a preseriative. A solution of 0.52g of the compound in 25.0g of water has a melting point of -0.36C. What is the molar mass of phenylcarbinol?
October 6, 2010

English
I think it may be either Hasty generalization or Post Hoc, but I'm not sure.
October 2, 2010

English
IS this sentence a fallacy? If so what type? If you start out with a bottle of beer a day and then go to a glass or two of wine in the weekends, you're well on your way to becoming a hopeless drunk.
October 2, 2010

Chemistry
What volume of a 0.600 M solution of AgClO4 is needed to produce 160g of AgCr04?
September 27, 2010

Chemistry
You made this so easy! Thank you!
September 27, 2010

Chemistry
What is the molarity of 550.0 mL of KOH solution, that reacts completely with 675 mL of a 0.450 M CrCl3 solution?
September 27, 2010

Chemistry
Aluminum sulfate reacts with barium chloride to yield barium sulfate and aluminum chloride. What mass of barium sulfate is produced from 650 mL of 0.320 M of aluminum sulfate? Thank you.
September 27, 2010

pre- calculus
simplify 3x+2y/3y
August 12, 2010

Math
No it doesn't
August 10, 2010

Math
A man comes up to play a game. you flip a coin, if heads you win $1 and keep playing if heads again you get $2, if you get heads again, $4 and so on. If you flip tails you take your money and the game is over. How much should he be willing to pay?
August 10, 2010

Math
100
July 22, 2010

finance
Can you show me how to do this in excel?
July 12, 2010

finance
You have credit card debt of $25,000 that has an APR (monthly compounding) of 15%. Each month you pay minimum monthly payment only. You are required to pay only the outstanding interest. You have received an offer in the mail for an otherwise identical credit card with an APR ...
July 12, 2010

Critical thinking
Do not guess or jump to conclusions. (In this step, describe how you found if you have the necessary information to proceed. For example, explain how you identified what information is provided and what information must be determined.)
July 4, 2010

Critical thinking
Do not guess or jump to conclusions. (In this step, describe how you found if you have the necessary information to proceed. For example, explain how you identified what information is provided and what information must be determined.)
July 4, 2010

Critical thinking
Employ meaningful self-dialogue throughout the process, including written or drawn prompts as well as spoken words. (In this step, explain how you organized the assignment using notes, tables, diagrams and drawings.)
July 4, 2010

Critical thinking
Focus on the accuracy of the assumptions and conclusions. (In this step, explain how you kept a focus on the assignment to be clear about the requirements. For example, describe how you verified the assignment instructions and scoring guide to make sure everything required is ...
July 4, 2010

Bus 3004
Demonstrate a positive attitude toward solving a problem. (In this step, explain how you kept a positive attitude as you complete a assignment.)
July 4, 2010

Bus 3004
compare university online Library and using the Internet
July 4, 2010

BUS 3004
How credible is Academic Search Premier
July 4, 2010

BUS 3004
Compose one paragraph that describes your research strategy that you used to find one source in the Capella Library. Your composition needs to be clearly written with descriptive words. Avoid overusing pronouns. Include the following items within the paragraph:
July 4, 2010

medical
the effect of the patient self-determination act on health care delivery consider how you think records management procedures have had to respond to this piece of legislation
June 11, 2010

bio
what affect would a very short generation time, such as that of bacteria, have on speciation?
May 31, 2010

history
out of the three basic necessities - food, shelter, and clothing - which one do you think is the most important for India and other South Asian countries?
May 26, 2010

Algebra
4-9(2x-3)+7(x-1)
May 16, 2010

physics
The brightest light detected from the star Antares has a wavelength of about 103 nm. What is the frequency of this light?
May 9, 2010

math 2nd grade
Need to find the rule for the following letters: AEFHIKLMN BCDGJOP
May 6, 2010

poetry
Why does Sylvia Plath decide to behin her poem crossing the water with black and repeats it twice in the first line?
April 25, 2010

Algebra
d=55t I need to be shown the operations to get the answer. I really dont get this
April 21, 2010

algebra
d=55t solve for t: help me to understand how to do this
April 21, 2010

math
I am trying to understand how to translate math questions into an inequality. Here is an example: The cost is at most $4857.95
April 21, 2010

Chemistry
the pressure will increase
April 13, 2010

chemistry lab titration
thank you!! for 25 mL would i still be able to use the h-h equation since k1>10^-5?
April 7, 2010

chemistry lab titration
so for 0mL added would it be k3 = [(HAsO4^-2)(OH^-)/(AsO4^-)] K3 = (x^2)/(0.1M of AsO4) pk3 = -log k3. then solve for x which would give you [OH^-] which you could use to find pOH and find pH by using pH + pOH = pKw??
April 7, 2010

chemistry lab titration
I don't understand how I would have to find the pH at 0mL or at 5 mL added or at 10 mL added. are the equivalence points at 10mL, 20mL, 30 mL? and the k3 that you are referring to did you get that from the pK3?
April 7, 2010

chemistry lab titration
10.0 mL aliquot of 0.100M Na3AsO4 is titrated with 0.100M HCl. pKa1=2.25 pKa2=6.77 pKa3=11.60 Sketch the titration graph by calculating the pH at 0mL, 5mL, 10mL, 15mL, 20mL, 25mL, 30mL, 40mL of HCl.
April 7, 2010

Finance
NET INCOME BEFORE TAXES OF $200,000 AND SALES OF $2,000,000. IF IT IS IN THE 50% TAX BRACKET, WHAT WOULD IT'S AFTER TAX PROFIT MARGIN BE?
March 31, 2010

geometry
if AB =5x-3and CD=2x+9 find AB
March 9, 2010

human service 220
well thats all the info. I have on this question
February 8, 2010

human service 220
How does data and information support human service organizations? When answering this question, address three of the following: · Planning · Operations · Human resources · Technical resources · Financial planning
February 8, 2010

Accounting
A manufacturing company has to decide between their current process which has a variable cost of $10/unit and investing in new equipment which will reduce the variable cost to $5/unit. The new equipment will cost $100,000. Use a break-even analysis to determine the number of ...
February 4, 2010

Accounting
A company has a 10% earning on sales before taxes. If material costs are reduced by $250.000 and everything else remains the same, how much would sales have to increase to earn the same amount?
February 4, 2010

HSM 220
Does anyone help with this subject?
February 2, 2010

Sociology
What aspects of the social and work environment in a fast food restaurant would be of particular interest to a sociologist because of his or her sociological imagination?
January 31, 2010

us history
The English ________ and __________ contributed the concept of LIMITED GOVERNMENT, INDIVIDUAL LIBERTY, REPRESENTATIVE GOVERNMENT, and RULE BY LAW.
January 18, 2010

English
Trying to help my grandaughter do her homework. Please help! They are learning about verbs in sentences. In the following sentence she is to underline the verb. "My father takes us hiking every Saturday." I am thinking it is "takes" but my daughter thinks ...
January 12, 2010

Trig
I'm confused on how to determine what the end result angles are for a trigonometric identity (I get how to find the value of sin, cos, etc., and I know how to find the reference angle. I just don't know how to determine further angles from there). For example, 3tan^2x-...
January 11, 2010

Trig
Sorry for the repeat!
January 11, 2010

Trig
4sin^2x-1=0 Are the angles 30, 120, and 210 and 300?
January 11, 2010

Trig
4sin^2x-1=0 Are the angles 30, 120, and 210 and 300?
January 11, 2010

Trig
tanBeta/(1-cos^2Beta) (sin/cos)times (1/sin^2)=sin/(cossin^2) 1/cossin Is this as far as I can reduce it?
January 10, 2010

Trig.
tan^2BeatacscBeta-tan^2 (simplify) (sin/cos)^2Beta times 1/sin-(sin/cos)^2 (sin^2/cos^2)-(sin^2/cos^2)=-sin/cos Is this correct?
January 10, 2010

Trig.
330 degrees?
January 10, 2010

Trig.
4cosBeta=1+2cosBeta 2cosBeta=1 cosBeta=1/2 60 degrees +/- 180--is this right? I know there should be another answer, but I'm not sure if it needs to be 240 +/-180 or 120 +/- 180. I don't know how to tell if it's added to 180 or subtracted, could you please explain??
January 10, 2010

Trig.
2sin^2x-3sinx=-1 sin^2x-3sinx=-1/2 times -3 sq. root of (sin^2x)+sinx= sq. root of 3/sq. root of 2 sinx+sinx=(sq. root of 3 times sq. root of 2)/2 2sinx=(sq. root of 3 times sq. root of 2)/2)) times 1/2 (sq. root of 3 times sq. root of 2)/sq. root of 4))=sinx
January 10, 2010

Trig.
Can you please review this to see if I did this right? 2cos^2x+3cosx=0 sq. root of (cos^2x)+(cosx)=sq. root of (-3/2) 2cos=(sq. root of -3 times sq. root of 2)/2)) times 2/1 cos=(2 times sq. root of -3 times sq. root of two)/2))
January 10, 2010

Trig
4tan^2u-1=tan^2u 3tan^2u=1 tan^2u=1/3 sq. root of (tan^2u)=sq. root of (1/3) tanu=sq. root of (3)/3 tanu=sq. root of 1 Did I do this one right? If not, could you please show me the correct method?? Thanks!
January 9, 2010

Trig
Solve: 3tan^2x-1=0. I got +/- (the sq. root of 3)/3 which is correct according to my study guide. However, I don't know how to use the unit circle to find this. The copy of the unit circle which I have does not have tangent values listed, only sine and cosine. I've ...
January 7, 2010

Trig
Simplify sin x cos^2x-sinx Here's my book's explanation which I don't totally follow sin x cos^2x-sinx=sinx(cos^2x-1) =-sinx(1-cos^2x) =-sinx(sin^2x) (Where does sine come from and what happend to cosine?) =-sin^3x
January 4, 2010

Trig
Is the right answer 1/sinB?
January 4, 2010

Trig
Use the fundamental identities to simplify the expression: cot beta sec beta I used 1+tan^2u=secu since cot is the inverse of tan. I flipped the tangent, then so it was 1+ (1/tan). But the book's answer is the cosecant of beta. Where did this come from??
January 4, 2010

Trig
I'm trying to find out which quadrant some trigonometric functions lie in. The problem is one of them is equal to zero, and zero is neither positive or negative. How do I determine which quadrant it belongs in then???
January 4, 2010

social studies -psychology
Which of the following characteristics will NOT reduce negative stereotyping in a contact situation? Intimacy Cooperation Equal status Independence
December 20, 2009

4th grade
write a number pattern for 8 starfish if each has 5 arms.
December 16, 2009

math
A community college has 3,000 students and 90 instructors. The college plans that enrollment will be 3,500 next year. How many new instructors should be hired if the college wants to keep the same student to instructor ratio?
November 25, 2009

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