객관식
Which of the following is an indicator that a chemical change has occurred during an experiment?
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1. Intro to General Chemistry
Physical & Chemical Changes
Multiple Choice
Melting can be best described as a process in which molecules:
A
change from a gas to a solid
B
react chemically to form a new substance
C
gain enough energy to overcome intermolecular forces and move more freely
D
lose energy and form stronger chemical bonds
검증된 단계별 안내1
Understand that melting is a physical change where a substance changes from a solid to a liquid state.
Recall that in a solid, molecules are held tightly together by intermolecular forces, restricting their movement.
Recognize that melting occurs when molecules gain enough energy (usually heat) to overcome these intermolecular forces.
This energy allows molecules to move more freely, transitioning from the fixed positions in a solid to the more fluid arrangement in a liquid.
Note that melting does not involve a chemical reaction or the formation of new substances; it is a change in physical state due to energy input.
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