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Q:

A substance that cannot be broken down into simpler substances

A) Heterogenous mixure B) Compound
C) Homogenous mixture D) Element

Answer:   D) Element



Explanation:

A substance that cannot be decomposed (broken down) into simpler substances by ordinary chemical means.

Examples: gold, iron, carbon, hydrogen, oxygen, nitrogen.

Material composed of only one kind of matter throughout (same atoms or same molecules).

Subject: Chemistry
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