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Inorganic Chemistry

Blazing goIITian

Joined:	6 Mar 2010
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18 Mar 2010 13:04:54 IST

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What is the exact definition of chemical reaction?

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What is the exact definition of chemical reaction?

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GamE

Cool goIITian

Joined: 9 Aug 2009

Posts: 44

18 Mar 2010 13:28:50 IST

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one element/compound reacts with another is called a chemical reaction

ThIrStY of IIT

Blazing goIITian

Joined: 6 Mar 2010

Posts: 380

18 Mar 2010 13:33:20 IST

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did you mean there is chance to form new substance or same substance.

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Blazing goIITian

Joined: 11 Apr 2009

Posts: 672

18 Mar 2010 13:41:33 IST

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WELL WIKIPEDIA SAYS.................

........ chemical reaction is a process that leads to the transformation of one set of chemical substances to another. reactions can be either spontaneous, requiring no input ofenergy, or non-spontaneous, often coming about only after the input of some type of energy, viz. heat, light or electricity.

ANSWERS.COM SAYS............

′kem·i·kəl rē′ak·shən)

(chemistry) A change in which a substance (or substances) is changed into one or more new substances; there is only a minute change, Δm, in the mass of the system, given by ΔE=Δmc², where ΔE is the energy emitted or absorbed and c is the speed of light.

IUPAC GOLDBOOK SAYS....................

chemical reaction

A process that results in the interconversion of chemical species. Chemical reactions may be elementary reactions or stepwise reactions (It should be noted that this definition includes experimentally observable interconversions of conformers.) Detectable chemical reactions normally involve sets of molecular entities as indicated by this definition, but it is often conceptually convenient to use the term also for changes involving single molecular entities (i.e. 'microscopic chemical events').

BLUE GENE SAYS...............

A CHEMICAL REACTION IS A PROCESS IN WHICH ONE ( OR MORE) SUBSTANCES GETS CONVERTED INTO ONE ( OR MORE) SUBSTANCES UNDERGOING A PROCESS........now the kind of process it undergoes varies according to the conditions ..u can get the idea of processes by above definitions!!..

aditya vardhan

Cool goIITian

Joined: 19 Jan 2009

Posts: 61

18 Mar 2010 15:16:18 IST

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Chemical reaction = chemical change

So what is changed?

Chemical properties are changed.

What is a chemical property?

The property of substance by virtue of its molecular shape, arrangement of electrons between the atoms.

Simply in a chemical reaction, the chemical identity or chemical compostion of substances is going to be changed.

Whereas in a physical change, there is only change in physical properties. There is no change in the composition of the substance. For example, conversion of liquid water to water vapour is a physical change. The composition of water, H2O is not altered.

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