Monday

February 20, 2017
Total # Posts: 623

**Chemistry**

Dr. Bob, thanks for answering. What does w/w and w/v and soln mean? i am an a student in chemistry but am having difficulty with this piece. Deb

*April 30, 2012*

**Chemistry**

How do you prepare 2% Cu S04? How does this solution differ from 2M CuS04? I am stumped. Thank you. Deb

*April 30, 2012*

**government**

Describe one or two ways in which the US government subsidies might affect the rate of production for petroleum within the US. Should the US use tax dollars to increase subsidies and thereby encourage more oil exploration and petroleum production associated with new drilling ...

*April 24, 2012*

**Science**

A boat is moving east at 50 km/ hr on a river that is going west at 7 km/hr. What is the velocity of the boat.

*April 12, 2012*

**Chemistry 2**

calculate the theorectical yield of the compounds to be prepared in the experiment. The metal ion in both cases is the limiting reagent.Find nuber of moles of Cu(II) in the sample of CuSO4 x 5H2O that you used. The equal the number of moles of [Cu(NH3)4]x H2O that could ...

*April 7, 2012*

**Chemistry 2**

Which is the oxidizing agent in the reaction below. Cr2O72- + 6S2O32- +14H+ > 2Cr3+ + 3S4O62- +7H20 A. Cr3+ B. S4O62- C. Cr2O62- D. S2O32- E. H+ I believe it's D or is it C not 100% sure please help. THANKS

*April 5, 2012*

**Chemistry 2**

Which is reduced in the following reaction: Cr2O72-+6S2O32-+14H+>2Cr3+ + 3S4O62- + 7H20 A. H+ B. Cr6+ C. S4O62- D. S2+ E. O2- I come out with Cr2O72 but that's not an answer so my next one is B. Cr6+ am I correct?

*April 5, 2012*

**Chemistry 2**

_________is reduced in the following reaction: Cr2O72-+6S2O32-+14H+>2Cr3+ + 3S4O62- + 7H20 A. H+ B. Cr6+ C. S4O62- D. S2+ E. O2- I come out with Cr2O72 but that's not an answer so my next one is B. Cr6+ am I correct?

*April 5, 2012*

**Chemistry**

Need help.... calculate the theorectical yield of the compounds to be prepared in the experiment. The metal ion in both cases is the limiting reagent.Find number of moles of Cu(II) in the sample of CuSO4 x 5H2O that you used. The equal the number of moles of [Cu(NH3)4]x H2O ...

*April 2, 2012*

**Chem 2 HELP**

Need help.... calculate the theorectical yield of the compounds to be prepared in the experiment. The metal ion in both cases is the limiting reagent.Find number of moles of Cu(II) in the sample of CuSO4 x 5H2O that you used. The equal the number of moles of [Cu(NH3)4]x H2O ...

*April 2, 2012*

**Chem 2**

Need help.... calculate the theorectical yield of the compounds to be prepared in the experiment. The metal ion in both cases is the limiting reagent.Find nuber of moles of Cu(II) in the sample of CuSO4 x 5H2O that you used. The equal the number of moles of [Cu(NH3)4]x H2O ...

*April 2, 2012*

**Chem 2**

left a line out of answer 1.546x10-2mols CuSO4x2=3.09x10-2 mole ions

*April 2, 2012*

**Chem 2**

Need help.... calculate the theorectical yield of the compounds to be prepared in the experiment. The metal ion in both cases is the limiting reagent.Find nuber of moles of Cu(II) in the sample of CuSO4 x 5H2O that you used. The equal the number of moles of [Cu(NH3)4]x H2O ...

*April 2, 2012*

**Chem 2**

Is this the correct formula for dichlorotetramminechromium (III) nitrate? (CrCl2(NH3)4 NO3)

*April 1, 2012*

**Chem 2**

Is this how I right this formula for dichlorodiaquoplatinum (II) (PtCl2(H2O)2)

*April 1, 2012*

**chemistry**

The oxyanion, CrO4 2- the chromate ion, is not in the solubility rules in our text. Examine your results from this lab and write a solubility rule CrO4 2-, the chromate ion. Cite experimental eidence to support your rule. This what our professor wants us to do.

*April 1, 2012*

**chemistry**

I need some help with making a solubility rule for CrO4 -2 for my chemistry homework.

*April 1, 2012*

**chemistry**

Calculate the molar solubility of Cu(OH)2, Ksp = 2.2 × 10–20, in 0.91 M NH3. Don't forget to use the complexation reaction Cu2+ + 4 NH3 ⇌ Cu(NH3)42+, K = 5.0 × 1013. Round your answer to two significant figures and do NOT use scientific notation.

*March 31, 2012*

**Chem 2**

need to figure out how to calculate. the value of DeltaH for the reaction below is -72kj_____kj of heat are released when 1.0 mole of HBr is formed in this reaction. H2(g)*Br2(g)> 2HBr(g) I know the answer is 36 but need help

*March 30, 2012*

**Chem 2**

i need help setting this problem up i know what the answer is but need to know how to get to it. calculate the kinetic energy in joules of an automobile weighing 2135lb and traveling at 55 mph (1 mile=1.6093km, 1lb=453.59g)

*March 30, 2012*

**Chem 2**

Checking to see if I did this right? Titration of HN03 titrated with NaOH ending result is 1.38. Titration A, endpoint pH = 8 is pKa or pKb= 1.38x106=5.861 and Titration of NH03 titrated with KOH ending results 1.54. Titration B, endpoint pH = 7 is KaorKb= Ka=1.54x105

*March 21, 2012*

**Chem 2**

5 drops of 0.10M NaOH were added to 20mL of the buffer problem, the pHwent from 3.40 to 3.43. Write a net ionic equiation to explain why the pH did not go up to about 10, as it would have if that amount of NaOH were added to distilled water or to 20mL 0.00040. HELP PLEASE....

*March 6, 2012*

**Chem 2**

Which of the following has the highest buffer capacity? A. 0.10M H2PO4-/0.10M HPO4 2- B. 0.50M H2PO4-/0.10M HPO4 2- C. 0.10M H2PO4-/0.50M HPO4 2- D. 0.50M H2PO4-/0.50M HPOr 2- E. They all have the same buffer capacity. Double checking I believe C is the right answer.

*March 5, 2012*

**Chem 2**

A popular buffer solution consist of carbonate (CO3 2-) and hydrogen carbonate (HCO3-) conjugate acid-base pair. Which, if any of the following such buffers has the highest buffer capacity? A. 0.9M CO3 2- and 0.1M HCO3- B. 0.1M CO3 2- and 0.9M HCO3- C. 0.5M CO3 2- and 0.5M ...

*March 4, 2012*

**com156**

i need help with my homework part 2:paraphrasing and quoting

*March 3, 2012*

**science**

if Earth's axis were not tilted,could any area have both a hot summer and a cold winter?

*February 27, 2012*

**algebra**

The sum of an uncirculated 'Mint-65 '1950 jefferson nickkle mintedd in Denver is 4/3 the value of a 1945 nickle minted in philadephia in similar condition. Togather the total of two coinsis$35. What is the value of each coin?

*February 23, 2012*

**algebra**

Could someone look over this paper before I turn it in? Thanks Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of...

*February 20, 2012*

**Algebra**

(3a-1)(a-4)

*February 20, 2012*

**Math/117 University of Phoenix**

Could someone look over this paper before I turn it in? Thanks Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of...

*February 20, 2012*

**math/117**

Could someone look over this paper before I turn it in? Thanks Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of...

*February 19, 2012*

**MATH**

Find the length of segment RS if S between R and T, the length of RS is 1/3 the length of segment RT, RS=3x-3 and ST=2x+6.

*February 12, 2012*

**MATH**

find y if s is the midpoint of segment RT, T is midpoint of segment RU, RS = 6x+5, ST=8x-1, and TU=11y+13.

*February 12, 2012*

**math**

In Exam Figure 7, AA′ = 33 m and BC =7.5 m. The span is divided into six equal parts at E, G, C, I, and K. Find the length of A′B. Round your answer to two decimal places.

*February 10, 2012*

**CDA**

I need to find 5 children's books that support dev. of gender identity by portraying males and females in diverse roles.

*February 7, 2012*

**Thermodynamics**

Streptomycin, an antibiotic, is produced on a large scale in the United States. The purified solution contains 50 wt% streptomycin water. Preparation of 500 mL intravenous (IV) drip solution bag requires addition of diluent and preservative. The diluent solution is 2 wt% NaCl ...

*January 31, 2012*

**Algebra**

In 1994, the life expectancy of males in a certain country was 63.8 years. In 2001, it was 66.0 years. Let E represent the life expectancy in year t and let t represent the number of years since 1994. The linear function e(t) that fits the data is? Use the function to predict ...

*January 29, 2012*

**Geometry**

The endpoints of one diagonal of a rhombus are (0, -8) and (8, -4). If the coordinates of the 3rd vertex are (1, 0), what are the coordinates of the 4th vertex? (7, -12) (7, -8) (-8, -4) (-4, -12)

*January 17, 2012*

**geometry**

The endpoints of one diagonal of a rhombus are (0, -8) and (8, -4). If the coordinates of the 3rd vertex are (1, 0), what are the coordinates of the 4th vertex? (7, -12) (7, -8) (-8, -4) (-4, -12)

*January 17, 2012*

**Economy Today**

Do total profits (A) decrease, (B) increase, or (C) stay the same when new technology reduces average total costs (shifts ATC downward in Figure 26.2 ) in (a) An unregulated natural monopoly? (b) A price-regulated natural monopoly? (c) A profit-regulated natural monopoly?

*January 15, 2012*

**Algebra 1**

Solve by substitution 2x+3y=40.50 3x+y=38.00

*January 13, 2012*

**Mathematical methods**

Following completion of your weekly readings, complete the exercises in the “Projects” section on page 397 of Mathematics in Our World. You should be concise in your reasoning. For Project #1, work only equations (a) and (c), but complete all 6 steps (a-f) as shown ...

*December 13, 2011*

**statistics**

if a 2-tail p value is .56 and the alpha is .05 how do i interpret the results?

*November 27, 2011*

**Finance**

Assume WhirledCom has an issue of 15 year $1000 par value bonds that pay 6% interest, semiannually Futher asssume that today's required rate of return on htese bonds is 9% How much would these bonds be worth today? Round off to the nearest $1

*November 14, 2011*

**nath**

explain how you can add two fractions with denominators of 10 and end up with a sum whose denominator is 5.

*October 25, 2011*

**statistics**

In a poll of voters in a certain city, 32% said that they backed a bill which would limit growth and development in their city. The margin of error was reported as 1.7% with 90% confidence. Determine the bounds for the confidence interval. A. (88.3%, 91.7%) B. (30%, 34%) C. (...

*October 23, 2011*

**7th grade social studies**

„X Nationality - Born in Italy but closely associated with Spain „X Lifespan - 1495 - 1558 „X Career - Franciscan Friar who became a Missionary & Explorer in the New Wordl „X Famous for : Discovering the Pueblo tribe called the Zuni indians. Duped into ...

*October 23, 2011*

**Calculus**

find the critical numbers of the function: h(p)=p-1/p^2+4

*October 17, 2011*

**calculus**

for a given patient it is determined that the blood vessel may rupture if its diameter increases faster than 200 um/s. The blood vessel starts with diameter 4mm and needs to expand to a diameter of 7mm. Is it safe to inflate the balloon at a constant rate of 30 mm^3/s? What ...

*October 17, 2011*

**Calculus**

suppose a balloon used in angioplasty is a 30mm long cylinder, with hemispherical caps at both ends.Determine a relationship between the rate of change in the volume of the balloon and the rate of change of its diameter.

*October 17, 2011*

**math**

If f(x)=x/(14 x + 11), then the domain of f includes all real numbers except

*October 7, 2011*

**math**

How do I solve this problem- how many 2/3 x 3 inch slices can I get out of eight 12 x 6 inch cakes?

*October 5, 2011*

**Algebra II**

prove the following using trigonometric identities: cos 0 (sin 0 + cos 2nd power / sin 0) = cot 2. Keep getting stuck. thanks

*October 2, 2011*

**ETh126**

Describe other measurements sociologists utilize to calculate prejudice.

*September 30, 2011*

**physics**

suppose an airplane, landing on a runway with an initial speed of 45 m/s, slows down at an acceleration rate of -5m/s/s. What will the speed of the airplaine be one second after landing?

*September 14, 2011*

**math word problem**

Melissa collected 3 kinds of leaves when she was out -elm, maple and oak. She has 2 times as many maple leaves as elm leaves and 5 times as many oak as elm leaves. Altogether she has 32 leaves. How many of each kind does she have?

*September 13, 2011*

**Geometry**

A right triangle and a square share a side. The hypotenuse of the triangle measures 10 cm. One base of the triangle measures 4 cm. Neither the known base nor the hypotenuse is the side that is shared with the square. Find the area of the square.

*September 11, 2011*

**Math**

1/2(12n - 8)

*September 8, 2011*

**Algebra**

After three plays in which a football team lost 7 yd,gained 3 yd and lost 1 yd, respectively, the ball was placed on the teams own 30 yd line. Where was the ball before the three plays?

*September 6, 2011*

**Managerial Finance**

Compare the performance of East Coast Yachts to the industry as a whole. For each, comment on why it might be viewed as positive or negative relative to the industry. Suppose you create an inventory ratio calculated as inventory divided by current liabilities. How would you ...

*September 1, 2011*

**Finance**

Colgate-Palmolive Company has just paid an annual dividend of $0.85. Analysts are predicting a 10% per year growth rate in earnings over the next five years. After that, Colgate’s earnings are expected to grow at the current industry average of 4.7% per year. If Colgate&#...

*July 30, 2011*

**education**

how are such difference between urban and rural communities with adolescentsocialization declining overtime and why

*July 23, 2011*

**statistics**

78% of us homes have a telephone. In a random sample 250 homes, what is the probablity that fewer than 50 do not have telephone

*July 23, 2011*

**Chem**

The formula is C3H6Br2. If the compounds is called 1,2-dibromopropane, A, B and C must be...this is question 20, from which there was no answer to this question. Need to know the answer,please.

*July 20, 2011*

**Chem**

we can most accurately say of aluminum that it..

*July 20, 2011*

**ETH/125**

I am trouble with my second assignment for week 7. I just can not understand exactly what I should be researching?

*June 25, 2011*

**chemistry**

how much heat is needed to bring 90.0 grams of aluminum from 25 to 75 degrees celcius?

*June 16, 2011*

**persuasive essay**

Thank you for all of your help on this essay. I will make all the corrections this time. Does this essay sound more persuasive this time?

*June 12, 2011*

**persuasive essay**

Why Americans should not count on Social Security for retirement. Even though Social Security may always have enough funds to support itself, Americans need another form of retirement funding in addition to Social Security. Americans cannot live on Social Security alone. With ...

*June 12, 2011*

**persuasive essay**

Why Americans should not count on Social Security for retirement. Even though Social Security may always have enough funds to support itself, Americans need another form of retirement funding in addition to Social Security. Americans cannot live on Social Security alone. With ...

*June 12, 2011*

**com 156**

I need someone to read over this and tell me if it sounds ok. It is supose to be a persuasive essay Why Americans should not count on Social Security for retirement. Even though Social Security may always have enough funds to support itself, Americans need another form of ...

*June 11, 2011*

**physics**

The charge (in coulombs) on an object increases according to (q)=(2 coul)e^[0.05/sec)(t)], where t is in seconds. How many seconds is the object deficient 1.56x10^20 electrons (from neutral)? 0, 12.56, 21.94, 41.21, 28.0, 50.5, 65.90, 105.00, 874.00, 1000.00

*May 31, 2011*

**HSM/220**

i need help with this one. i need to know where to start at. i am not sure where to begin detailing how a human service organization focused on providing job skills to high school dropouts would address the following: • Statement of opportunity • Impact of ...

*May 15, 2011*

**HSM/220**

i need help with this one. i need to know where to start at. i am not sure where to begin detailing how a human service organization focused on providing job skills to high school dropouts would address the following: • Statement of opportunity • Impact of ...

*May 14, 2011*

**8th grade math**

The two boxes are similar rectangular prisms. what is the height of box B. I figured out the volume of the smaller box first now what do I do?

*May 4, 2011*

**Chemistry**

How many grams of Li2SO4 are needed to prepare 250.0 mL of a 4.0% m/v Li2SO4 solution?

*April 30, 2011*

**Com 155**

Thank you so much for your help. After your suggestions made my paragraph sound much better. It is nice to have someone take a second look at it.

*April 22, 2011*

**Com 155**

I would appreciate if someone could look at the assignment I have to complete. I have included the rules I am to follow and the paragraph that I have written • Read two of the five paragraphs on the second page of this appendix. Write a brief paragraph of about 150 words ...

*April 22, 2011*

**math**

5 blue and 3 green what are probabilty of getting blue

*April 19, 2011*

**algebra**

solve -0.9x < -5x

*April 17, 2011*

**human resources**

I am not sure how to start the business assessment I can't find a sample of one

*April 16, 2011*

**com 155**

Thank you for your help I have changed it a bit. I know I still have to put a couple of adj and adverbs but what do you think now Recently I watched the 2010 version of “Nightmare on Elm Street” it was quite different from the 1984 version. A woman Nancy is having ...

*March 31, 2011*

**com 155**

Use at least five adverbs and five adjectives to write a brief review of a movie, sporting event, musical performance, or television show. · Bold each adverb. · Underline each adjective. · Compare the event to one or more similar events. When comparing, ...

*March 31, 2011*

**Chemisty**

When the gases dihydrogen sulfi and oxygen react, they form the gases sulfu dioxid and water vapor. How od you write a balanced equation for the reaction?

*March 29, 2011*

**Comm 155**

Could you please check these sentences and tell me if they make sense. Write five sentences in which you address changes in your writing. 1. With practice, I have gotten better at grammar and punctuation. 2. Working with a study group has made my sentence structure better. 3. ...

*March 15, 2011*

**trig**

using the given point (9, squareroot 19) find the value of cosx

*March 4, 2011*

**beginning/intermediate college algebra**

true

*March 4, 2011*

**economics today**

Do total profits (A) decrease, (B) increase, or (C) stay the same when new technology reduces average total costs (shifts ATC downward in Figure 26.2 ) in (a) An unregulated natural monopoly? (b) A price-regulated natural monopoly? (c) A profit-regulated natural monopoly?

*March 1, 2011*

**statistics**

57, 61, 57, 57, 58, 57, 61 What is the mean My answer 408/7=58.285=58.286 answer is 58.286

*February 21, 2011*

**statistics**

Are my answers right for the first data set?

*February 20, 2011*

**Economics**

mr=0,15

*February 18, 2011*

**STATISTICS**

A statistics professor conducted a study on the effect of playing video games on a student’s test scores. On the first day of class, she randomly divided her classes into groups. Group one played video games 2 hours a day, group two played video games 4 hours a day, and ...

*February 5, 2011*

**3rd grade math hw help!**

A polygon is a plane figure with at least three straight sides and angles, and typically five or more.

*January 31, 2011*

**Sociology**

What is Weber's thesis or main arguement in his essay, the distribution of power: class, status, power and what are his 3 main arguments.

*January 18, 2011*

**college**

what is the mass of solute dissolved in 50.0g of a 12.5% saline solution?

*December 16, 2010*

**statistics**

1.the mean is 58.286 1.the median is 57 1.the range is 4 The standard deviation for The first data set is8.116

*December 14, 2010*

**Science**

If I put a backward spin on a rubber band ball it returns spinning in the opposite direction. This does not happen with a tennis ball or basket ball. Why does the rubber band ball change its spinning direction?

*December 14, 2010*

**Geometry**

If the angles of a triangle have the ratio 3:4:5 and you want to know what they are would you go 3x + 4x + 5x = 180 and solve for x?

*November 30, 2010*

**geometry**

Thank you so much!

*November 30, 2010*

**geometry**

Thank you! That was a fast answer! What if it was angles? The angles of a triangles have the ratio 3:4:5 - would you say that 3x + 4x + 5x = 180 and then solve for x?

*November 30, 2010*