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questionbase.50megs.com AS-Level Revision Notes


AS Chemistry ­ Revision Notes
Unit 1 ­ Atomic Structure, Bonding And Periodicity
Atomic Structure
1. All atoms have a mass number, A (the number of nucleons), and a proton number, Z (the number
of protons).
2. Isotopes have different numbers of neutrons, and have different…

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a. 6:6 coordination number if one ion is much smaller than the other (e.g. NaCl)
b. 8:8 coordination number if both ions are roughly the same size (e.g. CsCl)
7. A unit cell is the smallest unit of structure that has all the features of the…

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d. Insoluble in water.
22. Properties of metallic structure:
a. High melting/boiling point due to strong attraction between electrons and cations.
b. High electrical and thermal conductivity.
c. High density, very strong, ductile and malleable.
23. In order to change state, a certain amount of energy…

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5. Electrical conductivity across period 3:
a. This increases from Na to Al, because the number of delocalised electrons able to carry
current increases, thus increasing the ability to conduct electricity.
b. The elements Si to Ar have close to zero electrical conductivity, because they bond…

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d. The acid is added to remove carbonate ions which would form barium carbonate (also
insoluble):
2H + (aq) + CO 3 2-
(aq) CO 2 (g ) + H 2 O(l)
12. The atypical nature of beryllium:
a. The chlorides of other group II elements…

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