Multiple Choice
In the classification of matter, which of the following is considered a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following properties describe all matter?
A
Is always a solid at room temperature
B
Can conduct electricity
C
Is always visible to the naked eye
D
Has mass and occupies space
Verified step by step guidance1
Understand the question is asking for properties that describe all matter universally, not just some forms or types of matter.
Recall the definition of matter: Matter is anything that has mass and occupies space (volume). This is a fundamental concept in chemistry and physics.
Evaluate each option given: 'Is always a solid at room temperature' is not true because matter can be solid, liquid, or gas at room temperature.
Consider 'Can conduct electricity' — this is true only for some matter (like metals), but not all matter conducts electricity (e.g., gases and many nonmetals do not).
Look at 'Is always visible to the naked eye' — many forms of matter are invisible to the naked eye (like gases or microscopic particles), so this is not a universal property.
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