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When a copper coin changes color from copper to silver after being placed in a solution, is this an example of a physical change or a chemical change?
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1. Intro to General Chemistry
Physical & Chemical Changes
Scelta multipla
As more and more energy is added to the atoms of a solid plastic, the plastic will first change into which state?
A
a gas
B
a plasma
C
an ionic solid
D
a liquid
Guida verificata passo dopo passo1
Understand the states of matter: solids, liquids, gases, and plasma, and how energy affects transitions between these states.
Recall that when energy (usually in the form of heat) is added to a solid, its particles gain kinetic energy and begin to vibrate more vigorously.
Recognize that as the energy increases, the solid reaches its melting point, where it changes from a solid to a liquid state.
Note that the transition from solid to liquid is called melting, and this occurs before the substance can become a gas or plasma.
Therefore, the first state change for a solid plastic upon adding energy is to become a liquid.
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