Question

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

Answer 1

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.

Answer 2

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.