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12 Cards in this Set
- Front
- Back
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Sodium is in group 1 and Magnesium is in group 2 on the periodic table. Which one is more reactive and why |
Sodium is more reactive than magnesium as it only needs to loose one electron which takes less energy compared to magnesium which needs to loose two electrons and takes more energy |
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Describe the reaction between sodium and water and give an equation |
Na + H2O > Na(OH) + H2 Sodium will react vigorously with water forming a molten ball on the surface, fizzing and producing hydrogen gas. It produces sodium hydroxide and so has a high pH |
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Describe how magnesium reacts with water and the acidity of the product and give an equation |
Magnesium reacts very slowly and so you can't actually see anything. The pH does increase as magnesium hydroxide is produced due to being alkaline but only slightly with a pH of around 9-10 due to magnesium hydroxide not being very soluble |
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Describe how Na reacts in the air Write an equation |
2Na + 0.5O2 > Na2O Reacts vigorously and produces a yellow flame |
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Describe how Magnesium reacts in the air Write an equation |
Mg + 0.5O2 > MgO Reacts vigorously and produces brilliant white flame |
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Describe how Aluminium reacts in the air Write an equation |
2Al + 3O2 > Al2O3 Reacts slowly |
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Describe how Silicon reacts in the air Write an equation |
Si + O2 > Si2O2 Slow reaction |
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Describe how phosphorus reacts in air Write an equation |
4P + 5O2 > P2O5 Spontaneously combusts Brilliant white flame produced |
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Describe how sulfur reacts in air Write an equation |
s + O2 > SO2 Burn steadily and produces blue flame |
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Describe the melting points of oxides of the period 3 elements |
The first three groups are ionic lattices. MgO has an increase in melting point due to 2+ ion, Al2O3 as the 3+ ion distorts the electron cloud making the bonds easier to break. SiO2 is lower due to having a giant covalent structure but higher than Na2O. P4O10 and SO2 are even lower due to having simple molecular structures with weak wan der waals forces |
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Are ionic lattice oxides in period 3 alkaline or acidic |
Alkaline |
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Are covalent oxides in period 3 alkaline or acidic |
Acidic |
