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Which of the following is classified as a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is best described as being made of matter?
A
Heat energy
B
A beam of light
C
Sound waves
D
A block of iron
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Step 1: Understand the definition of matter. Matter is anything that has mass and occupies space (has volume).
Step 2: Analyze each option to see if it has mass and occupies space. Heat energy is a form of energy, not matter, so it does not have mass or volume.
Step 3: A beam of light is electromagnetic radiation, which has no mass and does not occupy space, so it is not matter.
Step 4: Sound waves are mechanical waves that travel through a medium, but the waves themselves are energy disturbances, not matter.
Step 5: A block of iron is a solid object with definite mass and volume, so it fits the definition of matter perfectly.
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