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. Melting points first increase then decrease.
- B. Melting points increase steadily.
- C. Melting points decrease steadily.
- D. Melting points remain constant.
Answer
Melting points first increase then decrease.
Explanation
The correct option is Melting points first increase then decrease.. Melting points first increase then decrease. is the best answer because it directly supports the AQA A-Level Chemistry objective to explain melting point trends 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 the types of bonding in Period 3 oxides, thinking that all oxides have ionic bonding.
Remember that Period 3 oxides can have different types of bonding. For example, SiO2 has covalent bonding, while Na2O has ionic bonding. Review the specific bonding characteristics of each oxide. Keep the correction anchored to Period 3 oxides (A-level only) and the objective: Explain melting point trends of Period 3 oxides.
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