Wednesday

September 28, 2016
Total # Posts: 364

**science**

how do you make a phytoplankton at home

*January 17, 2011*

**Physics**

When I initially did it I got 2.23Hz.. which was also incorrect.

*January 11, 2011*

**Physics**

Original Question: A block hangs in equilibrium from a vertical spring. When a second identical block is added, the original block sags by 5.00 cm. What is the oscillation frequency of the two block system? bobpursley s'ltn: F=kx = mg x=mg/k but for the second block we ...

*January 11, 2011*

**Physics**

A block hangs in equilibrium from a vertical spring. When a second identical block is added, the original block sags by 5.00 cm. What is the oscillation frequency of the two block system?

*January 11, 2011*

**math**

Consider a simple game in which you will roll a six-sided die and receive $3.00 if you roll a 6. If it costs you $0.90 for each roll, what is the expected value?

*January 5, 2011*

**chemistry**

a buffer is made by mixing 0.1 moles of acetic acd a sodium acetate in 500 ml of solution. determine the pH of the buffer. (Ka for acetic acid - 1.8E-5)

*December 15, 2010*

**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*