Chemistry 9701/21 — May/June 2012
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Atoms, Molecules and Stoichiometry · Hydrocarbons · Hydroxy Compounds · Introduction to Organic Chemistry · Chemical Periodicity · Nitrogen and Sulfur · +5 more
Oxides are compounds which usually contain oxygen combined with one other element.
Oxides are classified as follows.
Using these terms only, complete the table to describe the oxides of the elements of the third period of the Periodic Table sodium to sulfur.
| acidic |
Give the names of two elements from sodium to chlorine which form more than one oxide.
Sodium reacts with water.
Describe, as fully as you can, what you would see when a piece of sodium is reacted with water.
Write an equation for the reaction of sodium with water.
Sulfur dioxide is present in small, but significant, amounts in the Earth's atmosphere.
State one way by which sulfur dioxide enters the atmosphere.
Give the formula of another sulfur compound which is formed in the atmosphere from sulfur dioxide.
What are the environmental consequences of the compound you have identified in (ii)?
Sulfur dioxide is used as a food preservative.
What property of sulfur dioxide enables it to act in this way?
Another sulfur compound which is present in the Earth's atmosphere is carbonyl sulfide, OCS. The sequence of atoms in the molecule is oxygen-carbon-sulfur and the molecule is not cyclic.
Draw a 'dot-and-cross' diagram of the OCS molecule.
Show outer electrons only.
Suggest a value for the O–C–S bond angle.
The rest of this paper
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