Science & Mathematics - 12 September 2007

Ok I'm stuck and there's no one to help me. So, PLEASE please pleeease if you know any one of these answers, don't hesitate to tell me. I promise to give best answer.

1. Demonstrate the dehydration synthesis and complete the following:
a) CH3(CH2)2COOH + CH3CH2NH2 -------> CH3CH2CH2CH2NHCOCH2 + H2O

d) .... -------> ethyl pentanoate + water (fill in the first part and state it in molecular formula)

2.
a) butyl ethanoate + water --------> ..... (fill in the second part and state in molecular formula

c) ... ------> CH3NH2 + CH3(CH2)4COOH (fill in the first part and state in molecular formula)

2007-09-12 12:42:45 · 1 answers · asked by Ivy K 3 in Chemistry

I really just don't get them. They hardly explained anything in the lesson. For instance:

a+1/2 + 3/2 = 1/a
They use the quadratic formula to solve it.
But in:
x/5 - 4/5 = 1/x
They dont.

I guess I'm just generally confused about it. If any of you can explain the steps and conditions in more detail Id appreciate it :)

2007-09-12 12:37:36 · 3 answers · asked by Anonymous in Mathematics

Factoring help, please help!! just need an explanation?
I was wondering how to factor 3xy^2-11xy+6x, my problem isnt with the numbers but rather its wit the leters. Please show the steps and explain thanks

2007-09-12 12:37:32 · 4 answers · asked by Anonymous in Mathematics

The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." If the ball is kicked with an initial velocity of 23.6 m/s at an angle of 58.5° above the ground, what is the "hang time"?

___s

2007-09-12 12:35:46 · 3 answers · asked by Marianna E 1 in Physics

All you can see is light. Is this a huge cluster of stars?

2007-09-12 12:35:45 · 6 answers · asked by red 2 in Astronomy & Space

the HARP (High Altitude Research Project) gun can fire an 84.00 kg projectile containing scientific instrument staright up to an altitude of 179 km. If we pretend there is no air resistance , what muzzle spees is required to attain this altitude (m/s)? How long does the projectile remain at a height in excess of 100 km, the height of interest for high-altitude research (s)?

2007-09-12 12:35:11 · 1 answers · asked by Anonymous in Physics

2007-09-12 12:34:19 · 2 answers · asked by mxm36 1 in Mathematics

2007-09-12 12:32:49 · 2 answers · asked by jennifer f 1 in Mathematics

if it is to be airboure after a takeoff run of 240 m? B) How long does it take the aircraft to become airborne?

2007-09-12 12:30:01 · 1 answers · asked by mary s 1 in Physics

how do you draw three planes that don't intersect?

2007-09-12 12:29:12 · 2 answers · asked by ____ 2 in Mathematics

i know it seems really really easy but for some reason i can't get it... :-/ help

write an equation for the specified line...

... for the vertical line through (0,-3)

thanks!

2007-09-12 12:28:07 · 5 answers · asked by Katie 4 in Mathematics

So the problem is 2x(3y-5x)+4xy - 8x(squared)

2007-09-12 12:27:57 · 9 answers · asked by sweetkels10 2 in Mathematics

a boat is traveling at 77m/min and travels for a total of 10sec. how much distance did the boat cover.

2007-09-12 12:26:52 · 4 answers · asked by *Natasha* 1 in Physics

By giving up,i don't think that person is a failure,it just means,he doesn't want to deal with the subject anymore.

2007-09-12 12:26:51 · 9 answers · asked by rose etoiles 3 in Mathematics

A football player kicks a football with an initial speed of 13 m/s at an angle above the horizontal of 30 degrees.

a.) what are the initial components of the balls velocity?
b.) How much time will it take to reach the peak of it's motion?
c.) How much time (from the instant of the kick) will it take to reach the final position?
d.) What is the max height the ball will reach?
e.) How far from the football player (in the horizontal direction) will the ball reach it's peak?
f.) What is the final x position of the ball when it strikes the ground (assuming that x (knot) = 0)

Would really appreciate any help, even if it is just describing the steps/formulas and leaving me to do the calculations. Thanks!

2007-09-12 12:25:39 · 2 answers · asked by Jamie H 1 in Physics

You're not doing my homework for me ok, i just need to know this 1 problem because i'm having trouble...

6
-
3 1/8
_______

???????


how do i do it?

2007-09-12 12:25:22 · 7 answers · asked by swift 1 in Mathematics

2007-09-12 12:24:54 · 2 answers · asked by Katrina 3 in Mathematics

Circular orbits seem more likely to me.

2007-09-12 12:24:30 · 7 answers · asked by Amy W 6 in Astronomy & Space

Come on! I need to figure ut this hard question for science. Anybody can help me out here!!!

2007-09-12 12:23:02 · 4 answers · asked by Anonymous in Earth Sciences & Geology

the question is: If the resistance of a circuit remains constant while the voltage across the circuit decreases to half its former value, what change occurs in the current?

I'm thinking that the current decreases to half of what it would be otherwise. I'm I correct or not? Thanks mucho!

2007-09-12 12:20:20 · 1 answers · asked by platypus 2 in Physics

Whats the word that goes with this defition:

1. A factor that does not change
2. The science that seeks knowledge
3. Applied science

Any help will do, even if you know one.

Thanks everyone

2007-09-12 12:19:56 · 3 answers · asked by navy15seal 1 in Earth Sciences & Geology

2007-09-12 12:17:40 · 7 answers · asked by Katrina 3 in Mathematics

Please show every step and explain

Find the first 6 terms given by the formula tn=tn-1+2tn-2 where t1=2 and t2=5

2007-09-12 12:16:34 · 2 answers · asked by Physics 101 1 in Mathematics

A certain density curve consists of a straight-line segment that begins at the origin, (0,0), and has slope 8. What should it look like?

2007-09-12 12:15:57 · 2 answers · asked by A 2 in Mathematics

I am solving a math puzzle at home and is wonderingwhat the world a cinqueen is. Please help.

2007-09-12 12:12:54 · 2 answers · asked by Anonymous in Mathematics

3t + 1
-------- = 3/4t - 5
4

Solve the equation. then check solution

Please explain to me how you did it or show me! Thnx!

2007-09-12 12:08:48 · 2 answers · asked by Tyler 3 in Mathematics

I need help with the following problem, and it would help if you could break down the steps for me so I can follow along. I also need to know if the car is decelerating or accelerating as well. Any help is appreciated, thanks!

A car is traveling to the left, which is the negative direction. The direction of travel remains the same throughout this problem. The car's initial speed is 27.0 m/s, and during a 5.1 s interval, it changes to the following final speeds. In each case, find the acceleration (magnitude and algebraic sign) and whether or not the car is decelerating.
(a) The final speed is 28.1 m/s.
m/s2 and the car is ---Select--- accelerating decelerating
(b) The final speed is 21.5 m/s.
m/s2 and the car is ---Select--- accelerating decelerating

2007-09-12 12:08:43 · 1 answers · asked by yummy_girlscout 1 in Physics

do I have to solve for x and y in the first line? Please explain to me the formula in which I have to use to solve this.

2007-09-12 12:06:02 · 7 answers · asked by JoLLie 2 in Mathematics

dont ask how but my friends and i started talking about it. and i guess it did have me curious...

2007-09-12 12:04:46 · 6 answers · asked by Anonymous in Agriculture

at what speed in m/s is the ball thrown

2007-09-12 12:02:36 · 1 answers · asked by Anonymous in Physics