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Phase Change Review

answer question
solid molecules in place
liquid molecules moving around
Gas molecules moving away
Solid-liquid-Gas Solid-liquid-Gas
Gas-liquid-solid Gas-liquid-solid
Weak attraction Easy to pull Solid-liquid Liquid-Gas
Strong attraction Easy to pull together Liquid-Gas Solid-liquid
A solid holds its shape because its molecules move in place, not around each other. A solid holds its shape because its molecules move in place, not around each other.
A gas has no visible shape because its molecules can move away from each other. A gas has no visible shape because its molecules can move away from each other.
A liquid flows because its molecules move around, not away from each other. A liquid flows because its molecules move around, not away from each other.
A phase change is when the molecules that make up a substance experience a change to their freedom of movement. This phase change involves a macro-scale change in appearance. A phase change is when the molecules that make up a substance experience a change to their freedom of movement. This phase change involves a macro-scale change in appearance.
A change that can be observed at the macro-scale can be explained by a change at the molecular scale, which cannot be observed with the naked eye. A change that can be observed at the macro-scale can be explained by a change at the molecular scale, which cannot be observed with the naked eye.
When energy is transferred to or from a substance, it can change the molecules’ freedom of movement. When energy is transferred to or from a substance, it can change the molecules’ freedom of movement.
Temperature is a measure of the average kinetic energy of the molecules of a substance. Transferring energy to a substance increases the kinetic energy of the molecules. Temperature is a measure of the average kinetic energy of the molecules of a substance. Transferring energy from a substance decreases the kinetic energy of that substance’s molecules.
Whether or not a phase change occurs is determined by the interaction between the kinetic energy of the molecules and the attraction pulling the molecules together. Whether or not a phase change occurs is determined by the interaction between the kinetic energy of the molecules and the attraction pulling the molecules together.
The molecular attraction of a substance never changes. The molecular attraction of a substance never changes.
A phase change occurs when the kinetic energy increases enough to overcome the attraction between molecules. A phase change occurs when the kinetic energy increases enough to overcome the attraction between molecules.
A phase change occurs when the kinetic energy decreases enough so that the attraction between molecules pulls them together. A phase change occurs when the kinetic energy decreases enough so that the attraction between molecules pulls them together.
Different substances can have either weaker or stronger molecular attraction. Different substances can have either weaker or stronger molecular attraction.
Created by: aeiouuoiea
 

 



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