2.4 Period 3
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What colour are most period 3 oxides?
White powder
What colour is sodium oxide?
Yellow
What colour is sulfur dioxide?
Blue
What colours do most oxides burn?
White flame
What colour does Na burn?
Orange flame
What colour does S burn?
Blue flames Choking gas
Why does silicon have a higher melting point?
Giant covalent structure so high energy is needed to break the many strong covalent bonds
What is the equation for sodium + water?
2Na + 2H2O —> 2NaOH + H2
What is the equation for Phosphorous oxide + Water?
P4O10 + 6H2O —> 4H3PO4
What does amphoteric mean?
Reacts with both acids and alkalis
What is the equation for the reaction between Sodium oxide and water?
Na2O + H2O —> 2NaOH
What is the reaction between Al2O3 + NaOH?
Al2O3 + NaOH —> 2NaAlO2 + H2O
What is the reaction between aluminium oxide + nitric acid?
Al2O3 + 3HNO3 —> Al(NO3)3 + H2O
Why is NaOH melting point lower than Mg(OH)2?
NaOH has a bigger atomic radius so has less attraction between the molecules, there is also less OH- ions to form bonds with.
Why does aluminium have some covalent character?
The oxide has a similar EN so the ion distorts and has some covalent character
How can substances be tested for containing ions?
By melting the substances and show they conduct electricity