MediumChemistryHigh School (9–10)GeneralThe Periodic Table › Periodic TrendsConceptual

Say whether each oxide is acidic, basic or amphoteric: K₂O, CaO, CO₂, Al₂O₃ and SO₂.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Say whether each oxide is acidic, basic or amphoteric: $\text{K}_2\text{O}$ , CaO, $\text{CO}_2$ , $\text{Al}_2\text{O}_3$ and $\text{SO}_2$ . Write the equation of one of the acidic oxides with water.

Need a reminder? The key ideaShow

Metal oxides are basic, non-metal oxides are acidic, and aluminium oxide is amphoteric. Across period 3 the oxides turn from basic to acidic. The formula follows the valency: oxygen has a valency of $2$ .

The worked solution

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← All Problems

← Four elements have these electron arrangements: 2, 3; 2, 8, 6; 2, 1; and 2, 8, 4.Which is more reactive, and why? (a) Ca or Mg, as metals. (b) Rb or K. (c) Cl or Br, as non-metals. →

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Say whether each oxide is acidic, basic or amphoteric: K₂O, CaO, CO₂, Al₂O₃ and SO₂.

The worked solution

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