Question

which of the following is a pure substance that can be broken down into simpler substances by chemical means? answer: a element b homogeneous mixture c solution d compound

Explanation:

To solve this, we analyze each option:

• Option A (element): Elements are pure substances but cannot be broken down into simpler substances by chemical means (they are the simplest form).
• Option B (homogeneous mixture): Mixtures (including homogeneous ones) are not pure substances; they are combinations of substances and can be separated by physical means.
• Option C (solution): A solution is a type of homogeneous mixture, so it is not a pure substance.
• Option D (compound): Compounds are pure substances made of two or more elements chemically combined, and they can be broken down into their constituent elements by chemical reactions (like decomposition).

Answer:

D. compound