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define a catalyst in chemistry
A catalyst is a substance that speeds up a chemical reaction, but is not consumed by the reaction; hence a catalyst can be recovered chemically unchanged at the end of the reaction it has been used to speed up, or catalyze.
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Asked 6/20/2011 4:36:18 AM
Updated 9/27/2017 7:54:36 AM
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A catalyst is a substance that speeds up a chemical reaction, but is not consumed by the reaction; hence a catalyst can be recovered chemically unchanged at the end of the reaction it has been used to speed up, or catalyze.
Added 9/27/2017 7:54:36 AM
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What asexual reproduction?
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Asexual reproduction is: a mode of reproduction in which the offspring comes from a single organism, and not from the union of gametes as it is in sexual reproduction.

Added 2/4/2018 12:15:31 PM
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valency
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Updated 8/15/2014 8:08:08 PM
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In chemistry, the valence (or valency) of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.
Added 8/15/2014 8:08:08 PM
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Confirmed by selymi [8/15/2014 11:06:08 PM]
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