Period 3 Elements and Their Oxides | AQA A-Level Chemistry (7405)
Period 3 Elements and Their Oxides
- 92 questions
- 8 subtopics
- Inorganic chemistry, examined on Paper 1
- Paper 1 and Paper 3
Period 3 elements and their oxides is examined on Papers 1 and 3.
It takes sodium through to sulfur, first reacting the elements with water and oxygen, then explaining the melting points of the oxides from their bonding and their behaviour with water, acids and bases.
Sample questions from Period 3 Elements and Their Oxides
Answer each one closed book first, then open the answer.
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Reactions of Na and Mg with Water
What is observed when magnesium reacts with cold water?
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Very slow reaction with few bubbles of gas produced; a white precipitate/coating of magnesium hydroxide forms on the surface. -
Period 3 Elements with Oxygen: The Oxides Formed and Their Bonding
What is the formula of the oxide formed when silicon reacts with oxygen?
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SiO₂ -
Period 3 Elements with Oxygen: Structures and Oxidation States
What type of structure do phosphorus(V) oxide, sulfur dioxide and sulfur trioxide have?
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Simple molecular structures -
Melting Points of Period 3 Oxides
Why does silicon dioxide have a high melting point?
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It has a giant covalent structure with strong covalent bonds throughout the lattice, which require a large amount of energy to break -
Period 3 Oxides with Water: Sodium and Magnesium Oxides
What is the product when sodium oxide reacts with water?
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Sodium hydroxide (NaOH) -
Period 3 Oxides with Water: The Acidic Oxides and the pH Trend
Write the equation for the reaction of phosphorus(V) oxide with water.
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P₄O₁₀ + 6H₂O → 4H₃PO₄ -
Period 3 Oxides with Acids and Bases: The Reactions
Why does silicon dioxide not react with dilute acids?
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Silicon dioxide has a giant covalent structure with strong covalent bonds that are not broken by dilute acids -
Period 3 Oxides with Acids and Bases: Acidic, Basic and Amphoteric
What term describes an oxide that can react with both acids and bases?
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Amphoteric
The 8 subtopics
One subtopic is one session. Work down the list.
| Subtopic | What it covers | Questions |
|---|---|---|
| Reactions of Na and Mg with Water | The observations, products and equations, and why magnesium needs steam to react quickly. | 9 |
| Period 3 Elements with Oxygen: The Oxides Formed and Their Bonding | Which Period 3 elements burn in oxygen, the formulae of the oxides, and whether the bonding is ionic or covalent. | 13 |
| Period 3 Elements with Oxygen: Structures and Oxidation States | Giant ionic, giant covalent and simple molecular structures across the period, and the oxidation state of each element. | 13 |
| Melting Points of Period 3 Oxides | Explaining the melting points from ionic, macromolecular and simple molecular structures. | 13 |
| Period 3 Oxides with Water: Sodium and Magnesium Oxides | The alkaline solutions the metal oxides give, with equations and the pH of each. | 8 |
| Period 3 Oxides with Water: The Acidic Oxides and the pH Trend | Why aluminium oxide and silicon dioxide are insoluble, the strong acids the non-metal oxides give, and the pH trend across the period. | 13 |
| Period 3 Oxides with Acids and Bases: The Reactions | Neutralisation reactions of the Period 3 oxides with acids and with bases, and the salts they produce. | 14 |
| Period 3 Oxides with Acids and Bases: Acidic, Basic and Amphoteric | Why an oxide is acidic, basic or amphoteric, and the two ways aluminium oxide can react. | 9 |
How the guide is worked
Answering a question from memory stores it far better than reading the answer again. The guide runs that as a fixed procedure on one subtopic at a time, about twenty minutes a session.
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Step 1 · Closed book
Cover the answers. Work through one subtopic and write down what you can. Leave blanks where you have nothing.
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Step 2 · Open book
Go back to the top. Read each printed answer and write it out in full, including the ones you had right.
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Step 3 · Closed book again
Same questions, same order, from memory. The gap between pass one and pass three is the session result.
Read the full method, the return schedule and the research behind it.
Nearby topics
AQA A-Level Chemistry Active Recall Guide
Every topic, not just this one. 2,442 questions with their answers.