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Which of the Following Observations Is/are Examples of Physical Change ∘^{\circ}

Question 9

Multiple Choice

Which of the following observations is/are examples of physical change?
1) The density of water decreases when it solidifies.
2) Aluminum melts when heated above 660 ∘^{\circ} C.
3) Hydrogen peroxide (H2O2) decomposes to water and oxygen.


A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2,and 3

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