Noun
molecule- in chemistry, the smallest particle of a specific element or compound that retains the chemical properties of that element or compound; a group of atoms held together by chemical bonds
- a tiny amount
Read full definition at wiktionary.org
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...A molecule is defined as an electrically neutral group of at least two atoms in a definite arrangement held together by very strong (covalent) chemical bonds. Molecules are distinguished from polyatomic ions in this strict sense. In organic chemistry and biochemistry, the term molecule is used less strictly and also is applied to charged organic molecules and biomolecules. Read full entry
This entry is from Wikipedia,the leading user-contributed encyclopedia.It may not have been reviewed by professional editors(See full disclaimer)
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- 1.Molecule - Wikipedia, the free encyclopedia
- ... (right) representations of the terpenoid molecule atisane. In chemistry, a molecule is defined as a sufficiently ... Main article: History of the molecule ...
- http://en.wikipedia.org/wiki/M
olecule
- 2.molecule: Definition, Synonyms from Answers.com
- molecule ( ) n. The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more
- http://www.answers.com/topic/m
olecule
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What molecule forms the Hey. Can anyone explain how
the hydrogen carbonate ion is
formed? Seeing as its
structure is that of a
molecule, I'm assuming that a
molecule gained an electron
from somewhere to form a
negatively charged ion? Please
help! I just really need to
know how the ion is created.
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Hydrogen carbonate or bicarbonate ion is formed when CO2 reacts with water. Actually, not very many of them are formed, but enough to make the resulting solution mildly acidic. CO2(aq) + H2O <==> H+ + HCO3^- This equilibrium lies to the left, meaning that most of the CO2 dissolved in water stays CO2 and very little goes to form the bicarbonate. This is the equilibrium that exists when we have a solution of "carbonic acid". There are actually no molecules of H2CO3 present in aqueous solution. There are many other reactions which can present cases where carbonate ions CO2^2- can combine with H+ to make HCO3- You mention that it might be formed when a molecule gains an electron. No. There is no neutral HCO3 molecule that gains an electron. The HCO3- ion forms when CO2 reacts with water. ============== Follow up ============== With respect to Nikita, if she got this from a book ... "H + ions and CO - ions...when they combine they form HCo3 wich is an week acid..." then it is not a very good chemistry book. |
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A monomer is a single small A monomer is a single small
molecule, and a polymer is
made of many small molecules.
How many small molecules are
joined to form a dimer?
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More than one. |
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What factors determine whether What does it mean to say a
molecule is polar? What
factors determine whether or
not a molecule has a dipole
moment?
I understand what a polar
molecule is but I don't know
what the dipole movement
factors are.
Please help.
Thank you.
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Any molecule that, as a whole, has an asymmetrical charge distribution, will be polar (have a dipole moment) Any bond between two elements with different electronegativities will have some ionic character and thus produce a dipole moment. The spatial direction and strengths of these dipole moments will average out to form the molecule's dipole moment. A few examples: Water has a dipole moment because it is a bent molecule. CO2 does not have a dipole moment, because it is linear and the dipole moments of the two C=O bonds cancel. BCl3 is flat and triangular, so the dipole moments of the 3 B-Cl bonds cancel. NH3 and NCl3 have a trigonal pyramid shape, so the dipole moments of their 3 bonds do not cancel. |
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