CH2 Revision (The Periodic Table)

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Ionization and Electronegativity
Increase from the bottom left to to top right (diagonal) across the periodic table.
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Are s block elements reducing or oxidizing agents?
They gain electrons so are reducing agents.
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Are p block elements reducing or oxidizing agents?
They lose electrons so are oxidizing agents.
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OIL RIG
Oxidation is loss [of electrons]. Reduction is gain [of electrons].
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Define Redox
A chemical reaction in which an electron is transferred from one species [the reducing agent] to another species, which is reduced by receiving the electron.
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Oxidation number of an element
Zero
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Oxidation state of Group 1 and 2 respectively
+1 and +2
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Oxidation state of group 6 and 7 respectively
-2 and -1
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Group two element + acid (HCl)
Metal + HCl -- Salt + Hydrogen
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Group 2 hydroxide formula
M(OH)2
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Uses for s block elements
Calcium phosphate minerals in living bones and skeleton. Calcium and magnesium ions play a vital role in biochemistry [chlorophyll, muscle operation] and carbonates exist in chalk and limestone.
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Define an electronegative element
An element that has a strong affinity for an electron and therefore acts as an oxidizing agent.
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What is the tendency for anions to be formed as you move down group 7.
The tendency to form anions decreases as you move down group seven from fluorine to iodine . Therefore fluorine is the most elctronegative element.
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How does melting temperater change as you move down group seven?
Melting temperature increases as you move down the group. This increase us due to the increase in number of electrons which contribute to the induced dipole - induced dipole effect.
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What is formed when a halogen reacts with a metal?
A halide.
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The general reaction for halide ions reacting with silver ions in dilute nitric acid
Ag+(aq) + X-(aq) = AgX(s)
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Other cards in this set

Card 2

Front

Are s block elements reducing or oxidizing agents?

Back

They gain electrons so are reducing agents.

Card 3

Front

Are p block elements reducing or oxidizing agents?

Back

Preview of the front of card 3

Card 4

Front

OIL RIG

Back

Preview of the front of card 4

Card 5

Front

Define Redox

Back

Preview of the front of card 5
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