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3 August, 22:09

What is a chemical property

of oxygen

A. it is a gas at room temperature

B. it reacts to iron to form rust

C. it expands when heated

Dit combines to form O2 molecules

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Answers (2)
  1. 3 August, 22:24
    0
    Oh ok those are the better choices. well a physical reaction means something changed in the property itself. so we can take off B and C. a chemical reaction means the property of the item changed completely and stayed that way. so im going with D.
  2. 3 August, 22:38
    0
    The answer is actually B, since rusting is an obvious chemical reaction which cannot be undone. A is just fact, C can be undone by cooling, and D can be undone by splitting the molecules apart. So the answer is B.
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