Which of the following is a physical change?
A. Carbon combines with oxygen to form carbon dioxide.
B. Ice melts at 0°C.
C. A red substance is decomposed by heat to form mercury and oxygen.
D. Water is decomposed by electricity into hydrogen and oxygen.
Answer:B
Which of the following is a physical change?
A. Carbon combines with oxygen to form carbon dioxide. B. Ice melts at 0°C. C. A red substance is decomposed by heat to form mercury and oxygen. D. Water is decomposed by electricity into hydrogen and oxygen.