객관식
Which of the following is NOT a chemical property of metals?
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1. Intro to General Chemistry
Chemical Properties
객관식
Which of the following is evidence of a chemical reaction?
A
Change in size of a substance
B
Change in state from solid to liquid
C
Dissolving of salt in water
D
Formation of a gas
검증된 단계별 안내1
Understand that a chemical reaction involves the formation of new substances with different properties from the original substances.
Recognize that physical changes, such as a change in size or a change in state (e.g., solid to liquid), do not produce new substances; they only alter the form or appearance.
Note that dissolving salt in water is a physical change because the salt dissociates into ions but no new chemical substances are formed.
Identify that the formation of a gas during a process is often evidence of a chemical reaction because it indicates that new substances are being produced.
Conclude that among the options, the formation of a gas is the best evidence of a chemical reaction.
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