1

Chemistry / Re: what happens if we put potassium in liquid hydrogen...?

« on: 02/02/2016 19:09:27 »

example when potassium react with water........the potassium react violently with hydrogen and produse burning fire ....the hydrogen gas it will get out.....

2

Chemistry / what happens if we put potassium in liquid hydrogen...?

« on: 02/02/2016 17:59:03 »

what happens if we put potassium in liquid hydrogen.....doest burn or explode. .

3

General Science / Re: power of batteries

« on: 03/06/2015 18:10:20 »

I mean why we say primary battery has 5 volt...why we dont say it has 5 amps

4

General Science / Why are batteries defined in terms of voltage, but wires in amperage or current?

« on: 02/06/2015 12:50:19 »

why we say for  primary batterys power ....its volt.........but in elecrcity wires  we say the power is amp

5

Physics, Astronomy & Cosmology / Re: Which isotopes are required for nuclear fusion?

« on: 16/05/2015 11:21:04 »

the more hard fusion isotopes together the more powerful energy produse.......and the more easy fusion isotopes together the more weak  energy that produce. ....is it correct

6

Physics, Astronomy & Cosmology / Re: Which isotopes are required for nuclear fusion?

« on: 16/05/2015 09:34:33 »

this question is not homework

7

Physics, Astronomy & Cosmology / Which isotopes are required for nuclear fusion?

« on: 15/05/2015 19:27:56 »

which isotopes required easy
 temperature  for nuckler fusion
T+T or D+D
and explain why....

8

Physics, Astronomy & Cosmology / Re: question for support combustion nitrogen gas

« on: 22/01/2015 16:56:14 »

can we use cylinder nitrogen instead cylinder oxygen with ethtelen in welding

9

Physics, Astronomy & Cosmology / question for support combustion nitrogen gas

« on: 22/01/2015 12:26:32 »

is it true that nitrogen gas can only support combustion in very high combustion temperature....and why

10

Chemistry / Re: Question for galvanic cell

« on: 20/11/2014 17:26:32 »

But I think laptop batteries and cell phone batteries have solid electrolyte.......

11

Chemistry / Re: Question for galvanic cell

« on: 20/11/2014 17:20:43 »

http://image.tutorvista.com/content/redox-reactions/electrochemical-cell.jpeg       I give you an example .what I mean...... another example http://www.tpub.com/neets/book1/chapter2/2-1.gif   my real question can jalvanic cell can be in one electrolyte solotion.... Same like these images. .Please I want the answer quickly. .

12

Chemistry / Question for galvanic cell

« on: 19/11/2014 11:39:18 »

Is there really two types of galvanic cell......one solution electrolyte. ...and .....two solution electrolyte
.

13

General Science / What's best for a soundproof wall, hollow or solid bricks?

« on: 02/09/2014 12:14:50 »

What is better bricks for a soundproof wall, outdoor sounds.... hollow bricks or solid bricks .....and why.

14

Physics, Astronomy & Cosmology / Re: which element that has more powerful flame temperature.. .potassium or magnesium

« on: 03/07/2014 20:23:51 »

http://www.docbrown.info/page12/gifs/ReactivitySeriesList.gif

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Physics, Astronomy & Cosmology / Re: which element that has more powerful flame temperature.. .potassium or magnesium

« on: 03/07/2014 20:21:31 »

http://universe-review.ca/I12-17-reactive.jpge

16

Physics, Astronomy & Cosmology / which element that has more powerful flame temperature.. .potassium or magnesium

« on: 03/07/2014 19:58:32 »

If we say ....k  flame temperature has 771c
 and Mg flame temperature has 3100c
But in series reactive table in air reaction.......potassium will be the first element on the top of the chart for the most burning element ...can you explain.
Here is an example

17

Chemistry / Re: can you write these elements up to down ..from more reactive to less reactive

« on: 21/06/2014 21:29:52 »

can some body answer my question. ...Please

18

Chemistry / can you write these elements up to down ..from more reactive to less reactive

« on: 19/06/2014 19:29:53 »

can you write these elements up to down ..from more reactive  to less reactive
F O N C Cl S P I Br.....

19

Chemistry / What are transition metals' and non-metals' chemical properties?

« on: 14/06/2014 12:59:55 »

what does mean transition metals can catalyze the chemical reaction
and nonmetals can speed up the chemical reaction....like sulfur

20

Chemistry / Re: can you give example of monomer compounds

« on: 23/05/2014 17:02:52 »

and what monomer elements....