Sunday

October 23, 2016
Total # Posts: 2,544

**chemistry Please Help Dr.BOB**

Complete hydrolysis of 25 mM ethyl acetate in an enzyme (i.e., esterase)-catalyzed reaction is carried out in a 40 mM NaCl solution buffered by 0.2 M Tris-Cl, pH 9.1. What is the pH at the end of the reaction? (For Tris base, which is the abbreviation for Tris (hydroxymethyl) ...

*February 7, 2011*

**Calculus**

.00092

*February 6, 2011*

**algebra**

The length of the side of a rectagular desk is given by 9x-2y cm. The length of the front is given by 9x+2ycm. What is an algebriac expression for the area of the top of the rectangular desk? Including correct units

*February 3, 2011*

**algebra**

(x^8+8)(x^9-^2)

*February 1, 2011*

**algebra**

convert decimal notation 5.166x10-^8

*February 1, 2011*

**Algebra**

(4x^6)(-3x^9)(6x^7)

*February 1, 2011*

**3rd grade math hw help!**

How can I do 5 1/4 line segment

*January 31, 2011*

**Physics**

Two charged particles exert an electrostatic force of 8 N on each other. What will the magnitude of the electrostatic force be if the distance between the two charges is REDUCED to one-third of the original distance? Would you just have to multiply 8 by 9?

*January 31, 2011*

**3rd grade math**

Thanks for the suggestion. I think my son got the idea on what to do.

*January 30, 2011*

**3rd grade math**

What patterns help you divide? DRaw a picture or make a chart to show how to divide 1600 by 4. Give the quotient. We know the answer but having trouble to make a chart to show the outcome. Please help. Thanks in advance

*January 30, 2011*

**chemistry**

What is the number of grams of a solute for a 3L of a 2.5 M HCl solution???

*January 26, 2011*

**chemistry**

What is the number of grams of a solute for a 3L of a 2.5 M HCl solution???

*January 26, 2011*

**chemistry**

what is the molarity of a solution when you ha 2mole of ammonium chloride (AgNo3) in 1L?

*January 26, 2011*

**Intermediate Accounting**

I am having a hard time calculating this my question is On April 1, 2011, the company paid an insurance company $4,000 for a two-year fire insurance policy. The entire $4,000 was debited to insurance expense. How do I calculate?

*January 25, 2011*

**statistics**

For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The general population of ...

*January 24, 2011*

**statistics**

For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.

*January 24, 2011*

**reimbursment methologies**

when coding late effects, the code for the what is usually sequenced first

*January 24, 2011*

**math**

To make 5 sets of curtains, when each set requires 2'1/3 yards, how many of material are needed ?

*January 18, 2011*

**physics**

A 15kg model plane flies horizontally at a constant speed of 12.5 m/s and the kinetic energy is 1171J and the potential energy is 3000J what is the new horizontal velocity? Please show work and explain.

*January 17, 2011*

**Business**

I am trying to write a 1500 words review of two articles that are discussing ethical perspectives or business ethics for two countries. Each article must contain info. on a different foreign country on a different continent; for example, if the first article you select ...

*January 16, 2011*

**Chemistry Lab**

Penicillin is an important antibiotic isolated from a type of mold. If you have 0.0468 g Penicillin, C14H20N2SO4MW = 31239 gmol , answer the following questions. A. How many moles of Penicillin do you have? B. What is the number of moles of nitrogen that are present? C. What ...

*January 11, 2011*

**math**

how to mixed #s or whole #s 18/7

*January 11, 2011*

**Science**

Which of the following are involved in the clotting process? 1. platelets 2. neutrophils 3. fibrinogen

*January 10, 2011*

**Science**

Improper functioning or regulation of which of the following might lead to poor regulation of the membrane permeability? 1. albumin 2. fibrinogen 3. platelets 4. lymphocytes 5. chloride ion levels

*January 10, 2011*

**language**

What is the adjective for the question, Some hawk's eyes are yellow.

*January 6, 2011*

**Math**

you use a rectangular piece of cardboard 20 in by 30 to construct a box. you square the sides x in. from each corner of the piece of cardboard and then fold up the sides to form the bottom. A. write a function A to represent the area of the base of the box in terms of x. B. ...

*January 4, 2011*

**MATH PRE-ALGEBRA**

yes! if it is addition or subtraction you have an open dot! if it multiplication or division than a closed dot!

*January 3, 2011*

**Algebra**

factor trinomial This is what I have so far don't know where to go from here 4h^2 + 8h - 5 (4h^2-2h) + (10h-5) 2h(h-5) + -5(2h-1) cant figure out what to do next

*January 1, 2011*

**Algebra**

I checked it and that is how it is on the worksheet I couldn't get it to work out either

*January 1, 2011*

**Math**

2 4/7

*December 29, 2010*

**us history**

what are the similarties and differences of philosophies in the Articals of confederation and the constitution

*December 28, 2010*

**physics**

20 Newtons

*December 28, 2010*

**geology**

... Refer to Figure 9.21 on p. 264 of the text. How would you determine the slope of the land surface in this figure?

*December 27, 2010*

**Chemistry **

I converted 22 min into second -lnx= 4.17E-4 *1320seconds -ln100 lnx=4.0547 x=E^4.0547 x=57.67 100-57.67=42.33%

*December 25, 2010*

**Chemistry **

The K comes from dividing it by 212seconds

*December 25, 2010*

**Chemistry **

k- 4.17E-4 A-ln100/27)/4.17E-4 t=52min B= (ln100/x)=4.17E-4*22 lnx=4.0547 e^94.0547)=57.667 100-57.667 =42% Thank you

*December 25, 2010*

**Chemistry **

The decomposition of ehtane, C_2H_6, is a first-order reaction. It is found that it takes 212seconds to decompose 0.00839M C_2H_6 to 0.00768M. A. How long in minutes will it take to decompose ethane so that 27% remain B. What percentage of ethane is decomposed after 22minutes?

*December 25, 2010*

**Chemitry **

Thank you

*December 25, 2010*

**Chemitry **

I understand how to get the Constant but I don't get how you know that it is a 17% increase?

*December 25, 2010*

**Chemitry **

If he activation energy of a reaction is 4.86Kj, then waht is the percent increase in the rate constant of a raction when the temperature is increased from 45 to 75C

*December 25, 2010*

**math**

If you add 9 to me and then subtract 6, you get 7. What am I?

*December 21, 2010*

**stastics**

I'm having a hard time with question, can someone help me? A random sample of medical files is used to estimate the proportion p of all people who have blood type B. If you have no preliminary estimate for p, how many medical files should you include in a random sample in ...

*December 19, 2010*

**statistics**

Finish times (to the nearest hour) for 59 dogsled teams are shown below. Draw a histogram. Use five classes. 261 269 236 244 280 296 284 297 290 290 247 256 338 360 341 333 261 267 287 296 313 311 309 309 299 303 277 283 304 305 286 290 286 287 297 299 332 330 309 326 309 326 ...

*December 19, 2010*

**science**

The average solar radiation incident on the surface of the earth is about 1 KW/m2 for the entire year. A solar house is built with solar panels installed in the roof to provide the heating and electrical energy of the house. If the roof has a surface area of 100 m2 and the ...

*December 12, 2010*

**soc 120**

1 32

*December 12, 2010*

**Chemistry**

25.26 g

*December 11, 2010*

**adult education**

describe why it is important to consider each domain in the study of adult development, provide an example of how one domain of development impacts the other two.

*December 10, 2010*

**ant101**

How does the identification of cultural universals impact our understanding of what it means to be human? How does the search for universals help us better understand human cultural behavior? What examples from your own culture can illustrate the ideas that our behaviors are ...

*December 9, 2010*

**word problem**

bought a jumbo box of candy. by the time i got home kids ate 1/4 of candy. Put groceries away and another 1/2 of what was left was eaten. Before dinner ate another 1/6 of what was left. Now there are 10 candies left. How many chocolates were in the box to begin with.

*December 9, 2010*

**physics**

block a of mass 4kg is on a horizontal, frictionless tabletop and is placed against a spring of negligible mass and spring constant 650n/m. the other end of the spring is attacked to a wall. the block is pushed toward the wall until the spring has been compressed a distance x...

*December 6, 2010*

**physics**

A 0.280-kg volleyball approaches a player horizontally with a speed of 15.0 m/s. The player strikes the ball with her fist and causes the ball to move in the opposite direction with a speed of 22.0 m/s. a)what impulse is delivered to the ball by the player? b)If the player'...

*December 5, 2010*

**language**

grendel is feared and hated because he: A)smells badly B) destroys crops C) eats men D) chases children.

*December 3, 2010*

**reimbisement methodologies**

You're an HMo director. you would like to ensure that your managed care plan is meeting industry standards. what is one way that you can do this?

*December 1, 2010*

**Finance**

A company issues a 6-year bond with a face value of 5,000 and semi-annual coupons payments of $275. Find the yield rate if the price of the bond is 6,500.

*November 28, 2010*

**Finance**

A company issues a 6-year bond with a face value of 5,000 and semi-annual coupons payments of $275. If the yield rate is 7%, find the price of the bond.

*November 28, 2010*

**Finance**

A company issues a 10,000 par value 10-year bond with 8% annual coupon payments. If the yield rate is 6%, calculate the price of this bond.

*November 28, 2010*

**general psychology**

What did Felicia do to cope with her sources of stress?

*November 28, 2010*

**medical billing and coding**

you work in a physcians office performing billing. You notice that guidelines haven't been followed accurately in completing the claim form. what will happen if you don't correct the claim form?

*November 28, 2010*

**6th grade**

rectangular prism: height 7 feet, width 4 feet and length 3 feet Find the volume Cylinder: radius 3.5 feet and height 7 feet Find the volume Van cargo space measures 8 feet tall by 5 feet wide by 13 feet deep. find the volume instruments will take up about 37 cubic feet Based ...

*November 27, 2010*

**math**

the dimensions of a rectangular prism are height 7 feet, width 4 feet and length 3 feet find the surface area part 2: dimensions of the cylinder are height 7 feet and radius 3.5 feet solve with a decimal then round to the nearest half foot. part 3 you have 1 gallon of paint ...

*November 27, 2010*

**english**

After completing the required readings for this week, discuss how you see the theme of creating art developing in the different stories and poems. What did you learn about the human impulse to create? Give examples from one of the stories and at least two of the poems that you...

*November 25, 2010*

**math**

If the total number of coins collected is $6.70 and the total number of nickels is .55, What is the fraction of nickels to the total number of coins?

*November 22, 2010*

**chemistry**

What is another way to write Fe or Ba electron configuration, charge,and number os unpaired e-?

*November 22, 2010*

**PHYSICS**

b) What is the acceleration at this instant?

*November 20, 2010*

**PHYSICS**

A 0.49 kg object is attached to a spring with a spring constant 167 N/m so that the object is allowed to move on a horizontal frictionless surface. The object is released from rest when the spring is compressed 0.12 m. Find the force on the object.

*November 20, 2010*

**algebra**

During the first part of a rip a canoeist travels 43 miles at a certain speed. The canoeist ravels 19 miles on the seond part of the trip at a speed 5 mph slower. The total time for the rip is 2 hours. What is the speed on each part of the trip?

*November 20, 2010*

**western experience**

In the nearly fifty years since the end of WWII, the continent of Europe has become more tightly integrated than ever before. What forces have made for this increasing unity, and what are the political landmarks that chart its path?

*November 9, 2010*

**chemistry**

what is the molarity of the solution if 0.135 g sodium sulfate in total volume of 175mL?

*November 8, 2010*

**algebra**

Kim brought a car 1,500.00.If the sales tax is %5,what will be the total that kim pay for the car?

*November 6, 2010*

**College Chemistry**

How many grams of BaCl2 are needed to make a 250mL of 15% solution?

*November 5, 2010*

**chemistry**

calculate the concentration of a silver ion when the solubility produc constant of AgI is 10 to the power of negative 16

*November 4, 2010*

**math**

how do i write this into an expression? 1/3 of a number

*November 3, 2010*

**Western Experience**

Why did the tide of WW2 began to turn in favor of the allies in 1942?

*November 2, 2010*

**Western Experience**

Thanks

*November 2, 2010*

**Western Experience**

why did the United States become so fearful of the Soviet Union after 1945? Why was the Soviet Union so fearful of the United States?

*November 2, 2010*

**Chemistry- please help ASAP!!!! thank you**

This is an old question, but I'm sure someone could benefit by this answer. You must reverse the 1st equation because you want S(rhombic) on the left and S(monoclinic) on the right in the end equation: S(rhombic) --> S(monoclinic) When you reverse a reaction, delta H ...

*October 31, 2010*

**logic**

Sometimes people get caught in a “downward spiral,” a case in which something leads to a result which in turn leads to more of the original thing, bringing on more of the result. As the process continues, the result continually gets worse and worse. An example is ...

*October 31, 2010*

**chemistry**

1.25 g of HClo3 has_____________ molecules (how many) ?

*October 28, 2010*

**chemistry**

1.25 g of HClO3 is _________ moles of molecules?

*October 28, 2010*

**chemistry**

0.058 moles of NH3 weighs how much grams?

*October 28, 2010*

**chemistry**

if the beaker was wet at the beginning of the experiment for the inital mass of the beaker, how would that affect the experimentally determined number of molecules of water in the hydrate?

*October 27, 2010*

**calculus problem**

Suppose and object is traveling directly from the earth to moon. The mass of the earth is 5.9742 x10^24 kg, the mass of the moon is 7.349 x 10^22 kg, and the mean distance from the earth to the moon is 384,000km. For an object between the earth and the moon, how far from earth...

*October 27, 2010*

**Western Experience : Since the sixteenth century**

Thank you Ms. Sue

*October 26, 2010*

**Western Experience : Since the sixteenth century**

How did imperialism impact non-western economies? How did Europeans achieve these transformations of local economies? What were the effects of those transformations?

*October 26, 2010*

**Western Experience**

yes Ms. Sue

*October 26, 2010*

**Western Experience**

in what ways did the alliance system, implemented to maintain a peaceful balance of power in Europe, in fact have the opposite effec?

*October 26, 2010*

**Chem**

Which of the following will be more soluble in an acidic solution than in pure water? 1.PbBr2 2.CsClO4 3.Cd(OH)2 4.Ag2(SO4) 5.BaSO3 How can I find which is which? Could you tell me the best way to find which one is more soluble? Thank you!

*October 26, 2010*

**Chem**

The question is; About Fe+2 concentration will Fe(OH)2 precipitate from a buffer solution that has a PH = 9.29? The Ksp of Fe(OH)2 is 4.87x10^-17 So here is what I did, Ksp = (x) (2x)^2 = 4x^3 4.87x10^-17 = 4x^3 x = 2.30x10^-6 I don't know what do I have to do after this. ...

*October 26, 2010*

**physics**

Hurricanes can involve winds in excess of 120 km/h at the outer edge. Make a crude estimate of the energy of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg/m^3) of radius 120 km and height 4.5 km. Make a crude estimate of the ...

*October 26, 2010*

**Social Studies**

In what way is a state different from a country?

*October 25, 2010*

**chemistry 101**

the valve between a 3.00-L tank containing O2(g) at 6.00 atm. and a 5.00-L containing N2(g) at 1.20 atm. is opened. Calcualte the ratio of partial pressures (O2:N2) in the container?

*October 25, 2010*

**chemistry **

if k2O, SrO, and Al2O3 are all correct formulas, predict the formulas for the oxides of Rb, Mg, & Ga. i think the answers are Rb2O, MgO,& Ga2O3 but im not sure why

*October 23, 2010*

**Chem**

I stuck on this prob. Can you help me to do this? 10.00 mL of a solution containing 0.20 M NaCl and 0.25 M AlCl3 is introduced into a cation exchange column. How many moles of hydronium ions will be released by the column?

*October 22, 2010*

**alegbra**

one side of a triangle is three time the shortest side. The third side is 7 feet more than the shortest side. The perimeter is 62 feet. Find all three sides.

*October 20, 2010*

**English**

Could you tell me if these sentences are correct? I have to identify the linking verbs. 1. I have grown weary of television. 2. She has been late every day this week. 3. You should be hungry after all that work. 1=have grown 2=has been 3=should be

*October 20, 2010*

**Project topic ideas**

i have a question could i do a project on to encourage more people to vote

*October 20, 2010*

**Project topic ideas**

great i have an idea now

*October 20, 2010*

**Project topic ideas**

Any ideas on a public service activity for a project that can be done by interviews surveys phone conversations etc..

*October 20, 2010*

**math**

explain in words how to solve 39 + five squared - 96 * 7 / (9 - 4)

*October 18, 2010*