When a small piece of a Group I metal is placed into a large beaker of cold water, a reaction occurs. Four statements about this reaction are listed. 1 The metal melts. 2 Hydrogen is produced. 3 Steam is produced. 4 The pH of the solution increases. Which statements about this reaction describe a physical change?
A.
B.
C.
D.
Exam No：0620_s25_qp_11 Year：2025 Question No：14
Answer:
A
Knowledge points:
3.1.5. Define the empirical formula of a compound as the simplest whole number ratio of the different atoms or ions in a compound
Solution:
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