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Chemical change

Chemical change

a process in which one or more substances are changed into one or more different substances.


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Re: holographic origin of life

Also the random chemical reactions scenario explains the concurrent evolution of human in all five continents ... There are no starting points in random reactions. Changing a gene causes only minor changes in the organism and replacing a missing gene doesn’t make everything alright. All ...

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by minasole
Wed Jan 08, 2014 3:05 pm
 
Forum: Evolution
Topic: holographic origin of life
Replies: 10
Views: 10945

Re: How do i know if a reaction is endothermic or exothermic?

Change in enthalpy = sum of bond energies of reactants - sum of energies of products = Total input energy – Total output energy From: Enthalpy Changes in Chemical Reactions http://faculty.ncc.edu/LinkClick.aspx?fileticket=L2sV5SDzIhE%3D&tabid=1871 ...

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by jonmoulton
Mon Nov 04, 2013 4:07 pm
 
Forum: General Discussion
Topic: How do i know if a reaction is endothermic or exothermic?
Replies: 1
Views: 1027

some clues from animal kingdom

"Some species, such as some snails, practice sex change: adults start out male, then become female (See also sex reversal). In ... they end up on the bare sea floor. This is triggered by the presence of a chemical produced by the females, bonellin. Some species, however, have no sex-determination ...

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by surgeongirl
Wed Sep 11, 2013 6:44 pm
 
Forum: Evolution
Topic: Gender divison in two opposites is greatest mistake of manki
Replies: 22
Views: 5782

Re: Organism that create or supress water

... gas from water and use the water's hydrogen in making sugars. Chemicals change state as they react all the time. TNT is a solid that makes a lot ... such as water in solid, liquid or gaseous state. The product of a chemical reaction has a new composition and can have many different physical ...

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by jonmoulton
Mon Aug 12, 2013 4:32 pm
 
Forum: General Discussion
Topic: Organism that create or supress water
Replies: 10
Views: 1615

which mechanism triggers the first cell differentiation?

... after n divisions. I read some articles (on Biology Stack Exchange and Wikipedia) on cellular differentiation and embryogenesis but still ... differentiation after a given amount of divisions ⋅ or a chemical substance (either cell-borne or external) forces a change in the ...

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by WoJ
Mon Jul 22, 2013 6:18 pm
 
Forum: Cell Biology
Topic: which mechanism triggers the first cell differentiation?
Replies: 4
Views: 1491
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