Multiple Choice
Which of the following statements explains why oxygen is classified asa pure substance and air is classifiedas a mixture?
A) Oxygen is more reactive than air.
B) Oxygen has a higher density than air.
C) Oxygen undergoes phase changes, whereas air is always a gas.
D) Oxygen contains only one substance, but air contains several substances.
Correct Answer:
Verified
Correct Answer:
Verified
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