객관식
Which of the following materials is most susceptible to chemical weathering by dissolution?
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1. Intro to General Chemistry
Chemical Properties
Multiple Choice
Which of the following is an indicator that a chemical reaction has occurred?
A
Change in the physical state without new substances
B
Formation of a precipitate
C
Melting of a solid
D
Evaporation of water
검증된 단계별 안내1
Understand that a chemical reaction involves the formation of new substances with different chemical properties, not just physical changes.
Recognize that changes in physical state, such as melting or evaporation, are physical changes and do not necessarily indicate a chemical reaction.
Identify that the formation of a precipitate means a solid forms from a solution during a reaction, indicating a new substance has been created.
Recall that the formation of a precipitate is a classic sign of a chemical reaction because it shows a chemical change has occurred.
Conclude that among the options, the formation of a precipitate is the indicator that a chemical reaction has taken place.
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