Laboratory Activity 4.5.1: Determining the properties of oxide of elements in Period 3. |
Problem statement: How do the properties of element oxides changes across the Period 3?
Hypothesis: Oxide properties of Period 3 change from base to acid when crossing the period.
Variable:
» | Fixed variable : Oxygen and water | |
» | Manipulated variable : Type of element oxide | |
» | Responding variable : Changes in properties |
Material: » Sodium oxide » Magnesium oxide » Aluminium oxide » Silicon (IV) oxide » Phosphorus oxide » Sulphur dioxide » Dichlorine heptoxide » Universal indicator » Water |
Apparatus: » Bunsen burner » Glass rod » Rubber stopper » Test tube » Test tube holder |
► | (A) With water
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► | (B) With sodium hydroxide and nitric acid
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► | Observation
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► | Inference
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► | Solubility in water decreases from Group 1 to 13 for metals. | |||||||||||||||||||||||||||||
► | Solubility in water increases from Group 14 to 17 for non-metals. |
► | The oxides of elements in Period 3 change from basic to amphoteric, and then to an acidic nature when across Period 3 from left to right. |
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