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Daniel Hearn

Easy peasy!
by

Daniel Hearn

on 30 April 2010

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Transcript of Daniel Hearn

Oxidation Numbers IS THE MEASURE OF ELECTRONS
THAT AN ATOM USES TO BOND
WITH ATOMS OF ANOTHER ELEMENT COVALENT BINDING IS THE SHARING OF ELECTRON PAIRS DATIVE COVALENT BIND IS ONE FORMED IN WHICH BOTH ELECTRONS ARE DONATED FROM THE SAME ATOM AND cOVALENT BONDING O
I
L
R
I
G OXIDATION
IS
LOSS
REDUCTION
IS GAIN IF OXIDATION HAPPENS, THE NUMBER INCREASES, AND REDUCTION IF THE NUMBER DECREASES BOTH REDUCTION AND OXIDATION IS CALLED... REDOX REACTION UNCOMBINED ELEMENT OXIDATION NUMBER: 0 COMBINED ELEMNT OXIDATION NUMBER: -2 COMBINED HYDROGEN OXIDATION NUMBER: +1 SIMPLE ION OXIDATION NUMBER: THE CHARGE COMBINED FLUORINE OXIDATION NUMBER: -1 VERY STRONG MOST ORGANIC COMPOUND HAVE COVALENT BOND ELECTRONS ARE SHARED EQUALLY BETWEEN ATOMS, IN COMPARISON TO IONIC BONDING Barium reacts with water in a redox reaction.
Ba(s) + 2H2O(l) Ba(OH)2(aq) + H2(g)
(i) Explain, in terms of electrons, what is meant by oxidation.
.................................................................................................................................... [1]
(ii) Which element has been oxidised in this reaction? Deduce the change in its oxidation
number.
element .............................................................................................................................
oxidation number changes from ………… to………… [2]
ANSWER:
(i) loss (of electrons) [1]
(ii) Ba: 0 → (+)2 (accept 2+) [2] DRAW A DOT AND CROSS DIAGRAM FOR NH3 LUSH
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