Monday

January 16, 2017
Total # Posts: 295

**organic chem**

Name the ester obtained when the alcohol is reacted with 2-ethylpentanoic acid? 1. 2 -propanol 2. 2-butanol 3, phenol

*February 20, 2013*

**organic chem**

Ok thank you so much I'm going to try to attempt the others.

*February 20, 2013*

**organic chem**

oh sorry, I wrote the ethyl group on my equation just didn't write it on the forum. Anyway, I'm curious how did you do the first one. Where did the ammonia come into play? It looks like you lost the -anoic acid group and replaced with the ammonia (NH3). And why did the...

*February 20, 2013*

**organic chem**

Ok, I'm just confused on the coupling reaction. Is the coupling reaction the amide like for A. Is is Ammonia. I drew out 3-hexanoic acid + NH3...thats where I'm stuck. I do apologize for the amount I'am asking you. I appreciate the help.

*February 20, 2013*

**organic chem**

ok, then just name the amide

*February 20, 2013*

**organic chem**

Draw and name the amides that would be obtained by reaction of 3-ethylhexanoic? Also with the apropriate coupling reagent, and the following amines: A. ammonia B. methanamine C. N-methyl methanamine D. Aniline E. N-ethyl aniline

*February 20, 2013*

**organic chem**

which of following alcohols can be oxidized to be a carboxylic acid. Name the carboxylic acid produced. Those that cannot be oxidized to a carboxylic acid name the final product A. ethanol b. 2-propanol c. 1-propanol d. 3-pentanol

*February 15, 2013*

**org. chem**

what would the oxidation product 1. 2-methylpentnal 2. 3-pentanone My answers: 1. 2-methylpentanoic acid 2. no further reaction I just want to be sure I'm doing this right. Thanks.

*February 15, 2013*

**organic chem**

Write an equation representing the oxidation of each of the following. I'm on 3-hexanol. And this is what I got -> [o] 3-hexanal and further oxidation I know you get 3-hexananoic acid. I don't know how to make this in the line formula. Can I put the -OH and the ...

*February 15, 2013*

**organic chem**

Which are enatiomers? optically active?identical? diastereomers? A.)...CH3 .....| ...H-C-Cl .....| .....Ch2Cl B.).....H .......| ...H3C-C-CH2CL .......| .......CL C.)...CH3 .......| ....CL-C-H ......| ......CH2CL D.)....CH2CL .........| ......CL-C-H .........| .........CH3 E...

*February 12, 2013*

**org. chem**

Draw the acetal obtanined from 1-propanol and benzaldehyde Draw the ketal obtained from 2-propanol and 3-methylcyclpentanone Can someone tell me where the actal/ketal comes from or do I just add it to the equation. Not sure how to start this. Thanks :)

*February 11, 2013*

**org. chem**

Can someone explain in simple terms the difference between hemiketal and hemiacetal? Just curious

*February 11, 2013*

**organic chem**

Draw the hemiketal obtained by addition of methanol to 3-methyl-2-hexanone This is what I got: 3-methyl-2-hexanone + CH3OH <-> CH3CH2CH(CH3)CH2C(OH)(CH3). But my answer is line angle formula because that's what the professor wants here's my line formula CH3...

*February 11, 2013*

**org. chem**

ok thank you that's what I got :)

*February 11, 2013*

**org. chem**

The question asks, "draw the hemiacetal obtained by addition of ethanol 2-methylpentanal" My question is how to do this problem? I know you can't actually draw it out on this site. However so I know how to do it on the upcoming test. Thanks :)

*February 11, 2013*

**organic chem**

oxidation product for 3-methyl-1-heptanol

*February 8, 2013*

**org. chem**

Hello, I do apologize DrBob222 I didn't see your post from yesterday. However, thank you for help and thank you devron for your help as well. The extra credit only says how would prepare a .6m acetate buffer with a pH = 4.0. So I too, wasn't sure what the question was ...

*February 8, 2013*

**org. chem**

How to start these problems out: Please help thank you Use the Henderson-Hasselbach equation: pH = pKa + log [A-]/[AH], where A- is the conjugate base and AH is the weak acid. Calculate the pH of an acetate buffer in which the acetate concentration [CH3COO-] is 3.5 times ...

*February 8, 2013*

**organic chem**

. Use the Henderson-Hasselbach equation: pH = pKa + log [A-]/[AH], where A- is the conjugate base and AH is the weak acid. Calculate the pH of an acetate buffer in which the acetate concentration [CH3COO-] is 3.5 times greater than acetic acid [CH3COOH]. pKa = 4.74. 9. How ...

*February 7, 2013*

**physics**

The body of a 1258 kg car is supported on a frame by four springs. The spring constant of a single spring is 1.31 × 104 N/m. Four peo- ple riding in the car have a combined mass of 230 kg. When driven over a pothole in the road, the frame vibrates and for the first few ...

*January 31, 2013*

**Chemistry**

7.40 *10^4

*January 15, 2013*

**AP Psychology**

What is right brain education and how does it relate to cerebral lateralization

*November 1, 2012*

**algebra**

put 8,10,12,14,16,18 in for L1 put the times in for L2 do quadratic reg on calc

*October 25, 2012*

**College algebra**

What is the domain for X³+2X²-9X-18

*October 15, 2012*

**College Physics**

Just for clarification, the question asks if he does 3.85 X 10^2 J of work.

*October 6, 2012*

**College Physics**

Suppose the Eskimo is pushing the same 50.0-kg sled across level terrain with a force of 51.5 N. If he does 3.85 102 J of work on the sled while exerting the force horizontally, through what distance must he have pushed it?

*October 6, 2012*

**Physics**

An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of + 14.2 m/s and measures a time of 22.2 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due ...

*September 6, 2012*

**Geometry**

Find the perimeter of a square with sides 10 feet long?

*September 6, 2012*

**Geometry**

In the standard (x,y) coordinate plane, if the x-coordinate of each point on a line is 4 less than twice its y-coordinate, what is the slope of the line?

*April 16, 2012*

**business**

all 400 answers are correct

*March 7, 2012*

**Physics**

A capacitor consisting of two parallel plates of area A = 4.6 m2 and spacing d = 0.150 m is filled with two parallel slabs of dielectric material of equal thickness and with dielectric constants 1 = 2.20 and 2 = 5.50, respectively. What is the total capacitance?

*February 26, 2012*

**social studies**

How can you use the word league in a sentence

*February 8, 2012*

**7th Geometry**

We are using the Pythagorean rule and I'm a little confused... Solve each problem using a grid. Round your answer to the nearest hundredth. Dover is located at (1,2) and Goodlow is located at (5,7). How far apart are the 2 cities? My answer is 6.40... am I doing this right...

*February 4, 2012*

**geometry**

A tree that is 100 feet tall casts a shadow that is 150 feet long. Determine the angle at which the rays of the sun hit the ground to the nearest degree.

*February 2, 2012*

**algebra**

The half-life of plutonium-234 is 9 hours. If 40 milligrams is present now, how much will be present in 4 days? (Round your answer to three decimal places.)

*November 20, 2011*

**chemistry 111**

2A+3B 3C hOW MANY MOLES OF b ARE REQUIRED TO COMPLETELY REACT WITH 9 MOLES OF A?

*November 2, 2011*

**math**

Suppose that the format for license plates in a certain state is two letters followed by four numbers. How many different plates can be made if repetitions of numbers and letters are allowed except that no plate can have four zeros?

*September 30, 2011*

**physics**

how to solve for velocity using these values... distance time(s) 28.5 (initial) 4.26 (initial) 89 (final) 6.77 (final)

*September 27, 2011*

**physics**

the car travels at 20m/s when the driver sees a child. It takes 0.8s to react, then steps on the brakes and slows at 7.0m/s^2. How far does the car go before it stops?

*September 22, 2011*

**physics**

a bike first accelerates from 0m/s to 5.0m/s in 4.55, then continues at this constant speed for another 4.5s. what is the total distance traveled by the bike?

*September 22, 2011*

**physics**

a student drops a ball from a window 3.5m above the sidewalk. the ball accelerates at 9.80m/s^2. How fast is it moving when it hits the sidewalk.

*September 22, 2011*

**physics**

A bike accelerates from 0.0m/s to 4.0m/s in 4s. what distance does it travel?

*September 22, 2011*

**Statistics**

An automatic machine in a manufacturing process is operating properly if the lengths of an important subcomponent are independently and normally distributed with a mean of 120 cm and a standard deviation of 4.7 cm. Find the probability that if 3 are randomly selected, all 3 ...

*September 21, 2011*

**physics**

A baseball thrown at an angle of 65.0^\circ above the horizontal strikes a building 16.0 {\rm m} away at a point 5.00 {\rm m} above the point from which it is thrown. Ignore air resistance. a) find the magnitude of the initial velocity of the baseball. b) find the magnitude of...

*September 15, 2011*

**physics**

A man stands on the roof of a 19.0 m tall building and throws a rock with a velocity of magnitude 30.0 m/s at an angle of 30.0 degrees above the horizontal. Ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock ...

*September 14, 2011*

**AP Calculus**

If f(x)=3x^2-x+2 then what is 2f(a)? What is f(2a)? What is f(a^2)? What is [f(a)]^2? What is f(a+h)?

*September 2, 2011*

**English**

Our state is bordered by Kansas to the west. Should west be capitalized...I was thinking it was a direction and didn't.

*August 24, 2011*

**Math**

Bacteria experiences exponential growth, increasing 17% every hour. If there are 800 bacteria now, in how many hours will there be 2000? How would I go about this problem?

*August 1, 2011*

**Math**

Okay, I need to find the 101th term of the sequence 5,9,13,17,21... Do I do this: a1 + (n-1)d SO... 5+(101-1)4 5+(100)4 105x4 420 Did I do this problem correctly?

*August 1, 2011*

**Algebra**

Thanks for your help!! I knew how to start, just wasn't sure the steps to go!

*July 29, 2011*

**Algebra**

Solve the logarithmic equation. log2(4x)-log2(x+3)=1

*July 29, 2011*

**Algebra**

4^(2x-2)=26

*July 29, 2011*

**Algebra**

Solve the exponential equation. 4^2x – 2 = 26 I know I use the one to one property to equate. But I am confused. Thanks!

*July 29, 2011*

**pre cal**

what is the equation to make a heart out of a cardioid?

*May 7, 2011*

**Math**

A raffle held by Mundane Products has collected 700 entries. They are giving away 40 TVs and 30 stereos. John bought 5 entries for the raffle. What is the probability that John wins exactly one TV as well as exactly one stereo? John just heard that the TVs are already decided ...

*April 28, 2011*

**Math**

What is the probability that at least 2 people in a random group of 4 people have a birthday on the same day of the week? Answer:

*April 27, 2011*

**Math**

A right circular cylinder with a height of 20 cm and a right circular cone share a circular base and have the same volume. What is the height of the cone?

*April 27, 2011*

**math**

In a game of blackjack, each player is dealt two cards from a standard 52-card deck. If the first card is 10 of clubs, what is the probability that the second card is heart?

*April 21, 2011*

**Math**

A teacher is trying to pick 7 students to represent his class at an upcoming state competition. If there are 18 boys and 10 girls in the class, in how many ways can the teacher pick 4 boys and 3 girls to attend the event?

*April 17, 2011*

**Math**

Thanks!!!!!!!

*April 17, 2011*

**Math**

A florist has access to 9 types of flowers and 8 types of foliage. He makes bouquets using 4 types of flowers and 3 types of foliage. How many different bouquets can he make?

*April 17, 2011*

**APUSH**

The U.N. Resolution 1441 authorized what?

*April 14, 2011*

**Math**

If you can afford a monthly payment of $760 for 27 years and if the available interest rate is 5.40%, what is the maximum amount that you can afford to borrow?

*March 29, 2011*

**Literature**

Screwtape scolds Wormwood because Wormwood finds enjoyment in human death. Screwtape reminds him that keeping people on earth longer allows temptations more time to tie them down. “The truth is that the Enemy, having oddly destined these mere animals to like in His own ...

*March 28, 2011*

**AP Chemistry**

what si the procedure to make a 0.10m solution of Potassium Hydroxide during a class lab?

*March 23, 2011*

**AP Chemistry**

This is an Advance placement chemistry class. We were told to fine the materials needed to do this lab, and the procedure. i need this info so i can physically do the lab.

*March 22, 2011*

**AP Chemistry**

what are the procedures and materials needed to make a 0.10m solution of Silver(I) Chloride?

*March 22, 2011*

**AP Chemistry**

what is the procedure and materials needed to make a 0.10m solution of Potassium Hydroxide?

*March 22, 2011*

**physics**

thank you!

*March 19, 2011*

**physics**

A hot stell ball of mass 1 kg is dropped into a 4 L bucket of water at room temperature (70 degrees F). If the system reaches an equilibrium temperature of 320 K, what was the initial temperature of the steel ball before it was dropped into the water? Cp of steel = 490 J/kg ...

*March 19, 2011*

**chemistry**

when a balloon has 1.2 L of a gas at 1.1 atm what will be the new volume of the balloon if the ballooon is placed in a partial vacuum, with a pressue of .35 atm?

*March 11, 2011*

**math**

scientific notation please exlain.

*March 3, 2011*

**New Age Math**

Consider the region defined by the inequalities: 0≤x 0≤y -21/4≤y-7/4x y+x≤7 4≤y-3/7x Pick up those points which are the boundary points of the resulting convex region.

*February 28, 2011*

**New Age Math**

Suppose that y≤5x,3x≤y and 14x+15y≤1 together with 0≤x, 0≤y. The maximum value of the function y+x on the resulting region occurs at x=? and y=? The maximum value of the function is ?

*February 28, 2011*

**English**

I need to write a Reading Response to "Why We Crave Horror Movies" by Stephen King. I need help figuring out the theme to the essay.

*February 23, 2011*

**6th grade English**

Draw a line under each preposition and to lines under the object of a preposition. He was thirty years old when he first went to California in 1868. i underlined once "to California" and "in 1868" and i under lined twice twice Californiia and 1868. is this ...

*February 5, 2011*

**algebra2**

What is the value of x in the solution to the system y = 4x + 3 and 3x + 2y = -16? (Round to the nearest integer if necessary.)

*February 1, 2011*

**Math- Geometry**

A board 20 feet long is cut into two boards with lengths in ratio of 5 to 2. To the nearest tenth of a foot, how lng is the longer piece of the board?

*January 30, 2011*

**math**

how long will it take to earn 525$ in interest if $3500 is invested at a 6% annual interest rate?

*January 26, 2011*

**math**

Omar wants to buy a double scoop ice cream cone. His favorite flavors are vanilla, strawberry, raspberry and chocolate. A combination with both scoops of raspberry represents ___ out of ___ possible combinations.

*January 17, 2011*

**physics**

A disk, with a radius of 0.25 m, is to be rotated like a merry-go-round through 800 rad, starting from rest, gaining angular speed at the constant rate α1 through the first 400 rad and then losing angular speed at the constant rate -α1 until it is again at rest. The ...

*December 5, 2010*

**chemistry**

a student needs to prepare an aqueous solution of sucrose at a temperature of 20 degrees c with a vapor pressure of 15. 0 mm Hg. How many grams of sucrose (mm=342 g/mol) does she need if she uses 375 g H20? (the vapor pressure of water at 20 degrees c is 17.5 mm Hg)

*December 2, 2010*

**physics**

I'm just having trouble setting up this problem. It's based on a picture so I'll describe it: There is an open ladder standing on the floor with a person on the third step on one side. There is a crossbar attached to the two sides of the ladder and the floor is ...

*December 1, 2010*

**physics**

A boat floating in fresh water displaces water weighing 35.6 kN. (a) What is the weight of the water this boat displaces when floating in salt water of density 1.10 x 10^3 kg/m^3? (b) What is the difference between the volume of fresh water displaced and the volume of salt ...

*November 14, 2010*

**physics**

A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.71 of the person's regular weight. Calculate the acceleration of the elevator, and find the direction of acceleration.

*November 14, 2010*

**physics**

An elevator (mass 4175 kg) is to be designed so that the maximum acceleration is 0.0700g. What is the maximum force the motor should exert on the supporting cable? What is the minimum?

*November 14, 2010*

**MATH**

Divide. Round to the nearest hundredth if necessary. 0.00829/0.003 my answer: 2.76 Is this correct

*November 8, 2010*

**Physics**

a book weighs 4 N. When held at rest in your hands, the net force on the book?

*November 8, 2010*

**physics**

You push a 2.0 kg block against a horizontal spring, compressing the spring by 15 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 75 cm from where you released it. The spring constant is 200 N/m. What is the block-table coefficient ...

*November 7, 2010*

**geometry**

In triangle ABC, if line BC is one inch longer than line AB, line AC is 10 inches shorter than the sum of line BC and line AB , and the perimeter of triangle ABC is 72 inches, find the length of line BC?

*November 3, 2010*

**bioethics**

For my bioethics class I need to create a "political" cartoon about clinical trials. (I say "political" because it's not really about politics, just the general format of a political cartoon.) I was trying to think of something related to placebos maybe...

*October 27, 2010*

**bioethics**

I need to create a political cartoon about clinical trials. I have no idea what to do. Any suggestions would be greatly appreciated.

*October 26, 2010*

**physics**

A ball was shot from the angles given in the table below. The corresponding ranges (landing at the same height from which it is shot) for three trials are given below as well. A. Determine the average range and standard deviation for each angle. B. Next calculate the initial ...

*October 20, 2010*

**physics**

During an Olympic bobsled run, the Jamaican team makes a turn of radius 7.6 m at a speed of 96.6 km/h. What is their acceleration in terms of g?

*October 12, 2010*

**chemistry**

.698

*October 11, 2010*

**childcare**

2 is c and 4 is a, the rest are right

*September 28, 2010*

**Child care**

the correct answers are 1 b, 2 c, 3a, 4c, 5b, 6c, 7d, 8d, 9b, 10c, 11c, 12d, 13b, 14c, 15b, 16c, 17a, 18d, 19d, 20c

*August 16, 2010*

**Child care**

actually i just took it and got a 60. 14 c 15 b and colleen is right will post the correct answers as i get them but 1, 5, 8, 12, 16, 17, 19, 20 are wrong. i have to wait until tommorow to retake.

*August 16, 2010*

**Math**

What quadrants are x>0, x<0, y>0, & y<0 in on a graph?

*June 10, 2010*

**algebra with pizzazz**

What might you have if you don't feel well? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .GLOVESDOWN ___________ the first space is empty.

*May 10, 2010*