Question

which of the following is a pure substance that cannot be broken down into simpler substances by chemical means? a homogeneous mixture b chemical compound c chemical element d heterogeneous mixture e solution

Explanation:

To solve this, we analyze each option:

• Option A (homogeneous mixture) and D (heterogeneous mixture), E (solution) are mixtures, not pure substances, so they can be eliminated.
• Option B (chemical compound) is a pure substance but can be broken down into simpler substances (elements) via chemical reactions.
• Option C (chemical element) is a pure substance made of only one type of atom and cannot be broken down into simpler substances by chemical means.

Answer:

C. chemical element