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OCR A-level Chemistry Period 3 elements

Period 3 elements

This page covers the following topics:

The Period 3 elements react with water at varying levels of intensity. When reacting with cold water, the corresponding hydroxide is produced. However, when steam is required to induce a reaction, then an oxide is formed.

Reactions of water with period 3 elements

Most Period 3 elements can burn in the presence of oxygen, producing different coloured flames and forming the corresponding oxide.

Reactions of oxygen with period 3 elements

There is no general trend in melting point along Period 3. The melting point is determined by the strength of the intermolecular interactions between the neutral molecular forms of the elements.

Melting point of period 3 elements

Period 3 elements react with steam to form oxides. These oxides can then undergo further reactions with water to form acids or bases

Oxides of period 3 elements

1

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Magnesium readily reacts with steam. Write the balanced equation for this chemical reaction, including physical states.

OCR A-level Chemistry Period 3 elements Magnesium readily reacts with steam. Write the balanced equation for this chemical reaction, including physical states.
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2

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Aluminium must be in its powdered form to react with steam. Explain why powdered aluminium is more reactive than a large lump of aluminium metal.

OCR A-level Chemistry Period 3 elements Aluminium must be in its powdered form to react with steam. Explain why powdered aluminium is more reactive than a large lump of aluminium metal.
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3

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Sodium burns spontaneously in oxygen to form both the oxide, Naβ‚‚O, and the peroxide, Naβ‚‚Oβ‚‚. Write the balanced equations for both reactions.

OCR A-level Chemistry Period 3 elements Sodium burns spontaneously in oxygen to form both the oxide, Naβ‚‚O, and the peroxide, Naβ‚‚Oβ‚‚. Write the balanced equations for both reactions.
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4

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Write the balanced equation for the formation of magnesium oxide by combustion of magnesium metal.

OCR A-level Chemistry Period 3 elements Write the balanced equation for the formation of magnesium oxide by combustion of magnesium metal.
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5

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White phosphorus (Pβ‚„) burns spontaneously in excess oxygen to form the phosphorous(V) oxide, Pβ‚„O₁₀. Write the balanced equation for this reaction.

OCR A-level Chemistry Period 3 elements White phosphorus (Pβ‚„) burns spontaneously in excess oxygen to form the phosphorous(V) oxide, Pβ‚„O₁₀. Write the balanced equation for this reaction.
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6

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Explain the trend in melting point from Na β†’ Al.

OCR A-level Chemistry Period 3 elements Explain the trend in melting point from Na β†’ Al.
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7

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What are the natural, molecular forms of phosphorus, sulphur and chlorine?

OCR A-level Chemistry Period 3 elements What are the natural, molecular forms of phosphorus, sulphur and chlorine?
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8

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Why does argon have such a low melting point?

OCR A-level Chemistry Period 3 elements Why does argon have such a low melting point?
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9

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Magnesium oxide reacts with water to form the basic hydroxide. Write the balanced equation for this reaction and state what colour it would turn litmus paper.

OCR A-level Chemistry Period 3 elements Magnesium oxide reacts with water to form the basic hydroxide. Write the balanced equation for this reaction and state what colour it would turn litmus paper.
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10

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Sulphur trioxide reacts violently with water to produce Hβ‚‚SOβ‚„. What colour would litmus paper turn after being dipped into the product solution?

OCR A-level Chemistry Period 3 elements Sulphur trioxide reacts violently with water to produce Hβ‚‚SOβ‚„. What colour would litmus paper turn after being dipped into the product solution?
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