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Q: A substance that cannot be broken down into simpler substances

  • 1
    Heterogenous mixure
  • 2
    Compound
  • 3
    Homogenous mixture
  • 4
    Element
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Answer : 4. "Element"
Explanation :

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).

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