Chemistry 9701/22 — October/November 2013
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Chemical Bonding · Hydrocarbons · Atoms, Molecules and Stoichiometry · Introduction to Organic Chemistry · Electrochemistry · Group 17 · +7 more
Valence Shell Electron Pair Repulsion theory (VSEPR) is a model of electron-pair repulsion (including lone pairs) that can be used to deduce the shapes of, and bond angles in, simple molecules.
Complete the table below by using simple hydrogen-containing compounds. One example has been included.
| number of bond pairs | number of lone pairs | shape of molecule | formula of a molecule with this shape |
|---|---|---|---|
| 3 | 0 | trigonal planar | BH₃ |
| 4 | 0 | ||
| 3 | 1 | ||
| 2 | 2 |
Tellurium, Te, proton number 52, is used in photovoltaic cells.
When fluorine gas is passed over tellurium at , the colourless gas TeF₆ is formed.
Draw a ‘dot-and-cross’ diagram of the TeF₆ molecule, showing outer electrons only.
What will be the shape of the TeF₆ molecule?
What is the F–Te–F bond angle in TeF₆?
The rest of this paper
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