The melting points of some of the oxides of the Period 3 elements, sodium to sulfur, are given in Table 2.1
Table 2.1
Compound | Melting point / K |
Na2O | 1193 |
MgO | 3173 |
Al2O3 | 2313 |
SiO2 | 1883 |
P4O10 | 613 |
SO2 | 198 |
State what is broken when each of the following compounds is melted.
Na2O ............................................................................................................. SiO2 ............................................................................................................. P4O10 .............................................................................................................
i) Give the formula of a Period 3 oxide from Table 2.1 that reacts with water to produce a hydroxide.
[1]
ii) Give the formula of a Period 3 oxide from Table 2.1 that reacts with water to produce an acid.
[1]
iii) Give the formula of a Period 3 oxide from Table 2.1 that has no reaction at all with water.
[1]
The oxides of the elements of the third Period behave differently with NaOH (aq) and HCl (aq). In some cases, no reaction occurs.
Complete Table 2.2 by writing 'reaction' for any reaction that occurs between the Period 3 oxide and HCl (aq) or NaOH (aq), with heating if necessary. If you think no reaction takes place write ‘no reaction’.
Table 2.2
Period 3 oxide | With HCl (aq) | With NaOH (aq) |
MgO (s) |
|
|
Al2O3 (s) |
|
|
SO2 (g) |
|
|
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