Science & Mathematics - 15 October 2007

a.. describe the flame obtained from a bunsen burner with the hole open, and compare it to the flame obtained with the air hole closed

b..explain why the two flames are so different (hint:think about how oxygen gets mixed with the fuel)

2007-10-15 05:14:16 · 4 answers · asked by Babiiee Laura Jaynee =] 1 in Chemistry

I need to find 3 bases that are capable of removing the most acidic hydrogen from methanol (CH3OH), ethylene (C2H2), and methylamine (CH3NH2). My problem is that I don't have a good pKa table and to use the one in my book you need to know what exactly what you are looking for. Also, how do you know the pKa of the base and conjugate base since the pKa value only pertains to acids? I think I might be making it harder than it is but I'm really confused.

2007-10-15 05:14:02 · 3 answers · asked by LaLa 1 in Chemistry

a block is at rest on the incline shown in the figure. the coefficients of static and kinetic friction are s = 0.42 and k = 0.36 respectively. The acceleration of gravity is 9.8 m/s^2. the angle is 19 degrees.

what is the frictional force acting on the 43 kg mass? answer in units of N.

2007-10-15 05:14:01 · 3 answers · asked by grouchy187 2 in Physics

There were several reactions that I made all involving the use of HCl. For example, NaNO2 + HCl, NaNO3 + HCl, and FeS + HCl. What product forms from these types of reactions involving this strong acid, HCl? How do I know when H2O or CO2 forms due to the use of acid?

I understand that an acid and a base gives a neutralization reaction, which leaves behind a salt. I'm not quite sure what happens with all others. Please don't just give me an answer, but, I need a concise explanation as well.

2007-10-15 05:13:35 · 3 answers · asked by Anonymous in Chemistry

A softball pitcher rotates a 0.250 kg ball around a vertical circular path of radius 0.4 m before releasing it. The pitcher exerts a 33.0 N force directed parallel to the motion of the ball around the complete circular path. The speed of the ball at the top of the circle is 13.0 m/s. If the ball is released at the bottom of the circle, what is its speed upon release?

Answer in m/s.....i have no clue how to solve this problem...i be greatly appriciate if someone can do it in step so i know how or where did that answer come from...thanks...

2007-10-15 05:11:53 · 3 answers · asked by pinkepromise 2 in Physics

2007-10-15 05:11:16 · 2 answers · asked by LisaE 1 in Mathematics

2007-10-15 05:09:50 · 8 answers · asked by Anonymous in Weather

A. Plateleta, bone marrow, and carbon dioxide.

B. Plasma and platelets

C. White blood cells, iron, and serum.

D. Red blood cells, calcium, and oxygen.

E. Oxygen, iron, and red blood cells

2007-10-15 05:09:30 · 4 answers · asked by Anonymous in Medicine

My husband would like to know.!

2007-10-15 05:09:15 · 26 answers · asked by Carol B 5 in Astronomy & Space

Suppose that you invested $16,000 in a high-risk growth fund that after 2 years was worth $25,000. Your broker used the following equation to find the average annual rate of return, (r)

16,000(1 + r)2 = 25,000
What is the annual rate of return?

I don't understand the equation.

2007-10-15 05:08:38 · 5 answers · asked by dale h 2 in Mathematics

I have been working on a new form of electrical production, that I believe is very revolutionary. If my invention came to light, could I possibly win the Nobel Prize? Is there a catagory for this? It really doesn't fall into physics, more into engineering.

2007-10-15 05:08:12 · 4 answers · asked by Jason G 2 in Engineering

An isosceles right triangle has an area 200cm^2.What is the length of its hypotenuse?

2007-10-15 05:06:41 · 5 answers · asked by Anonymous in Mathematics

The Lenny Archivist, always keeping an eye open for new job opportunities, decided to pay a visit to the Brightvale Institute of Technology, Engineering, Mathematics and Economics. Unfortunately, he showed up unannounced, and without an appointment, so the dean didn't have time to meet with him.

"Let me see if I have any free time," the dean said as he looked through the calendar. "But first, let me give you a little puzzle."

Then he wrote the following numbers on a piece of paper:

03 - 04 - 11 - 04 - 02 - 06 - 10 - 08

"Now, this code forms a word that would be part of your new job responsibilities. I don't think I could hire you unless you could solve it."

sighhh so lost =/

2007-10-15 05:06:40 · 1 answers · asked by Anonymous in Mathematics

Approximate the sum of the series correct to four decimal places.
((-1)^n)/((3^n)*n!)

2007-10-15 05:05:25 · 2 answers · asked by sugardaddy8815 1 in Mathematics

2007-10-15 05:05:09 · 9 answers · asked by tercentenary98 6 in Physics

science section of "answers?"

2007-10-15 05:03:45 · 3 answers · asked by Bluebeard 1 in Biology

no three points are collinear (imagine them lying on the perimeter of a circle. Use mathematical induction.

2007-10-15 05:03:34 · 1 answers · asked by Not Quite Agnostic 2 in Mathematics

The link from N.A.S.A. say around 2010 to 2011 there will be massive solar storms, when i quickly glanced at it i got the impression they weren't telling the whole story, this time frame is very close to the end of the Mayan calender that maybe this is what is going to destroy all like on earth, should i move down to my fallout shelter right now?


http://science.nasa.gov/headlines/y2006/10mar_stormwarning.htm

2007-10-15 04:58:36 · 10 answers · asked by Anonymous in Astronomy & Space

what is the molarity of a .1% auxin (IAA) solution. It also said noted that .1%=1g/L. THe formula weight of IAA is 186. So what is the molarity? I got an answer, and I just want to make sure it is correct! Thanks

2007-10-15 04:56:57 · 1 answers · asked by pacificglo1 2 in Chemistry

for grade 9 science

2007-10-15 04:56:25 · 6 answers · asked by Anonymous in Astronomy & Space

Perhaps with a thermonuclear bomb near its core. Maybe this would produce enough localized heat for fusion. What mass of H would be necessary? And how would we get anything down that far into the atmosphere?

2007-10-15 04:56:17 · 4 answers · asked by Anonymous in Astronomy & Space

2007-10-15 04:54:02 · 3 answers · asked by Raymond D 1 in Mathematics

what kind of 433 years young Clingon working as human hunter and a plumber would you be?

2007-10-15 04:52:22 · 3 answers · asked by Old Witch 3 in Astronomy & Space

Gravity doesnt affect a flame in space.

2007-10-15 04:52:07 · 1 answers · asked by Babiiee Laura Jaynee =] 1 in Physics

what is the concentration of blood. level of water in urine and concentration of urine in the hot eating salt and when you drink lots of liquid? :\

2007-10-15 04:52:00 · 1 answers · asked by Anonymous in Chemistry

I cant remember how to do molarity questions. basically we have IAA, whose formula weight is 186, and we need to find how many grams of it would take to prepare 500mL of a .5M solution. Thanks!

2007-10-15 04:46:04 · 4 answers · asked by pacificglo1 2 in Chemistry

Differentiate ln(tanx)

?_?

2007-10-15 04:45:43 · 5 answers · asked by Anonymous in Mathematics

i'm stumped on my chemistry homework, how does CO2 affect the atmosphere? answer in detail please

2007-10-15 04:43:51 · 10 answers · asked by Anonymous in Earth Sciences & Geology

distant past. Some types of flowers have five pedals. Reminds me that most animals, higher forms of animals, also have five "growths" coming off of their main body, a head, two arms, and two legs. Does this mean that we and the five pedal flowers came from the same "root" on the tree of life?

2007-10-15 04:43:40 · 5 answers · asked by Bluebeard 1 in Biology

2007-10-15 04:41:11 · 12 answers · asked by charley n 2 in Zoology