Chemistry - August 2007

The following is a description of a demonstration.

Step 1: A newspaper is placed over a meter stick that is hanging over the edge of a table halfway.

Step 2: At the edge of the meter stick that is hanging over the table, it is given a sharp hit. The meter stick breaks, but the newspaper doesn't move!

Describe what is happening in this demonstration in terms of pressure.

(hint: think atmospheric!)

Good Luck for the winner of the quickest best answer.

8D

2007-08-21 07:18:59 · 1 answers · asked by Anonymous

they both must have the same mass

they both must have carbon atoms

they both must burn in the presemce of oxygen

they both must be made of the smae elements

2007-08-21 07:03:58 · 3 answers · asked by Anonymous

2007-08-21 07:01:40 · 3 answers · asked by makaveliboi334 1

2007-08-21 07:01:00 · 4 answers · asked by makaveliboi334 1

Can someone balance

2007-08-21 06:54:37 · 2 answers · asked by KrAzZiELaOsBoI 1

A. +2, 2 amu
B. +4, 3 amu
C. +1, 1 amu
D.+1, 4 amu

2007-08-21 06:52:24 · 2 answers · asked by Vinny L 3

Can anyone balance?

2007-08-21 06:50:55 · 2 answers · asked by KrAzZiELaOsBoI 1

Proton
atom
molecule

2007-08-21 06:13:47 · 8 answers · asked by Ken h 1

2007-08-21 06:12:13 · 5 answers · asked by Vinny L 3

They both must have carbon atoms

they both must burn in the presence of oxygen

they both must have the same mass

they both must be made of the same elements

2007-08-21 05:25:28 · 2 answers · asked by Ken h 1

and 50mM tris and 50% glycerol?

2007-08-21 05:13:10 · 1 answers · asked by madeulo0k 2

2007-08-21 02:49:03 · 5 answers · asked by Don Draper 1

please do mention the quantity of pottasiumpermagnet, glicerine,water that would be the best thank u .

2007-08-21 02:37:21 · 2 answers · asked by Anonymous

Flask A: CO at 760 torr and 0 degrees C
Flask B: N2 at 250 torr and 0 degrees C
Flask C: H2 at 100 torr and O degrees C

a) Which flask will the molecules have the greatest average kinetic energy
b) In which flask will the molecules have the greatest average velocity

2007-08-21 02:32:30 · 2 answers · asked by Ade 1

Choose the correct statement from the following:




a. At the temperature of liquid nitrogen argon will also be in the liquid state.
b. CO2 never exists as a liquid, as it always changes directly from solid to gas.
c. In the experiment to be performed if both Ar and CO2 were allowed to reach the temperature of liquid nitrogen, both would sublime when removed from the liquid nitrogen.
d. The triple point has the lowest temperature and pressure coordinates at which the liquid state can exist

2007-08-21 01:49:18 · 2 answers · asked by chengdu 1

specifically i need values for the theoretical complete combustion of kerosene, methylated spirits, parafin wax and eucalyptus wood.

2007-08-21 00:59:55 · 2 answers · asked by Anonymous

How many tonnes of calcium carbonate must be heated to produce 10 tonnes of calcium oxide. Also, how much CO2 will be released. Please tell me exactly how to do the question- I don't just won't the answer.
Thanks

2007-08-21 00:41:12 · 4 answers · asked by checked.cherry 2

Also please state how would you make it!
What are the ingredients you are going to use and what is the title of your product!

2007-08-20 22:27:57 · 1 answers · asked by Anonymous

2007-08-20 22:23:34 · 1 answers · asked by John Michael C 1

FeCl- Iron (III) chloride

2007-08-20 22:17:50 · 2 answers · asked by John Michael C 1

The number of moles of any gas dissolving in water:


a. is independent of the temperature of the water
b. is independent of the gas used
c. is dependent on the volume of water used
d. is independent of the gas pressure above the water

2007-08-20 22:08:53 · 1 answers · asked by chengdu 1

1) A 500 mL sample of helium gas contains 2.0 moles of gas at 300 K.
(a) Find the pressure exerted by the particles.
(b) If the temperature is doubled and half of the gas escapes, what will be the new pressure?

2) Oxygen gas is released from a cylinder at the rate of 10 m^3 per hour at atmospheric pressure. If it is sold at a pressure of 200 atm and has a volume of 2.0 m^3, for how long will it supply oxygen?

Please help me do these 2 questions (and explain the steps) because I’m really having trouble with these 2. THANX to everyone who can help!! =D

2007-08-20 20:37:47 · 4 answers · asked by ♥ Victory ♥ 3

1. when the tert-butyl chloride and HCl have been mixed into the separatory funnel, It must be shaken vigorously. Then, venting. What is the purpose of venting?

2. When the layers are clearly separated, drain the HCl layer into the beaker.
While the upper layer (raw tert-butyl chloride) is poured into the erlenmeyer flask. After that, dehydrate Calcium Chloride (CaCl2)are added to the raw tert-butyl chloride.

What is the function of dehydrate CaCl2?
Is it as a catalyst?
Does it reacts with the raw tert-butyl chloride?

3- Why primary and secondary alkyl halide are not synthesized during this method? Explain plz.

4- Why is the percentage of the yield in this experiment is less than 100%? Does the sample contains impurities? Explain.

Thanks for those who's answering me.
A lot of thanks

2007-08-20 20:33:06 · 2 answers · asked by Anonymous

1. We use activated charcoal in about the size of pea. What is its role in recrystallization? What happen if we add it too much??

2. Why filter funnel must be warmed before filtering the solution?

Hope u all can help..
Thanks

2007-08-20 20:20:42 · 2 answers · asked by Anonymous

How many electrons are in a isotope Carbon 14 molecule?
I already know that there are 6 protons and 8 neutrons -plz plz help!

2007-08-20 20:12:19 · 5 answers · asked by rachelgrrl777 2

i just know it is to acidify the solution but can you explain in detail
thanks

2007-08-20 19:59:17 · 2 answers · asked by kev 2

Would HeF7 be stable? Would there be any isomers possible? How could I find out bond angles?

I was trying to draw it but He only has 2 electrons on outer shell, and F has 7?

2007-08-20 19:54:32 · 2 answers · asked by chengdu 1

you know, for special purposes. like when someone is trying to kill me. i jump behind them and hold the napkin over their face and they knockout. thanks ;)

2007-08-20 19:33:05 · 13 answers · asked by Anonymous

a glass of water is put on a scale. Ice is added to the water and the glass is weighed. Thirty minutes later the weight of the glass is noted to have increased. Why?

2007-08-20 17:50:08 · 3 answers · asked by Caretaker 7

Two main things generally determine whether a bond is polar or nonpolar. One is the electronegativity of the elements, the other is the geometric shape of the molecules formed. How do we determine the geometric shape? For example, if you have three atoms, it can either be linear, like H-Be-H, or bent, like H/O\H. If it's linear, there's a good chance of it being, nonpolar, if it's bent, it's probably polar. So it's important. Or you could have 4 atoms, and they could either be Planar, Triangular, or Pyramidal. What determines which geometric shape it is?

2007-08-20 17:44:33 · 3 answers · asked by dinomite_21000 2