Question detail
Which statement would earn credit for Explain that a pure element or compound melts and boils at specific temperatures.?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Purity, formulations and chromatography
Question
- A. A mixture of two or more elements
- B. A single element or compound not mixed with any other substance
- C. A solution with dissolved impurities
- D. Any substance that can be separated by physical means
Answer
The correct answer is A single element or compound not mixed with any other substance. It matches pure substance because the evidence is single element or compound / fixed melting point and the expected result is purity evidence.
Explanation
The correct option is A single element or compound not mixed with any other substance. The answer stays inside Purity, formulations and chromatography by linking the observation to the conclusion instead of naming a substance without evidence. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Misunderstanding Melting and Boiling Points
Students often think that all substances melt and boil at the same temperature regardless of purity.
Remember that a pure element or compound has specific melting and boiling points, while impurities can alter these temperatures.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.