Question detail
What is the trend in melting points of Period 3 oxides from Na2O to Cl2O?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Properties of Period 3 elements and their oxides (A-level only)
Question
- A. Increases then decreases
- B. Decreases steadily
- C. Increases steadily
- D. Remains constant
Answer
Increases then decreases
Explanation
The correct option is Increases then decreases. Increases then decreases is the best answer because it directly supports the AQA A-Level Chemistry objective to describe the bonding and structure of Period 3 oxides. This reasoning is anchored to Period 3 oxides (A-level only) in Properties of Period 3 elements and their oxides (A-level only), and it separates Period 3 oxide from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Misunderstanding Bonding Types
Students often confuse ionic bonding with covalent bonding when describing the bonding in Period 3 oxides, such as Na2O and SiO2.
Remember that ionic bonding involves the transfer of electrons and formation of charged ions, while covalent bonding involves sharing electron pairs between atoms. For example, Na2O has ionic bonds between Na+ and O2-, while SiO2 has covalent bonds between Si and O. Keep the correction anchored to Period 3 oxides (A-level only) and the objective: Describe the bonding and structure of Period 3 oxides.
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