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Phase change occurs when a substance transitions between different states of matter, such as solid, liquid, or gas. This change happens due to alterations in temperature or pressure, causing the molecular structure of the substance to rearrange itself. For example, when a solid is heated and turns into a liquid, it goes through a phase change known as melting.
Phase change in a material occurs when it changes from solid to liquid to gas; or the reverse.
The parameter changing through this series is the attraction between molecules, and their distance apart.
In a solid, the molecules are close together, and have inter-molecular bonds (shared electrons) between them.
As the temperature increases (or the pressure decreases) , the space between the molecules grows, and the sharing of inter-molecular bonds becomes more difficult. The phase state tends to the liquid.
Further heating will add sufficient energy that the vibration (movement) of the molecules overcomes any inter-molecular bonds, and the substance becomes gas.
The above ignores the triple point, which is the unique point at which the substance may exist in the three phases. And at certain areas on the phase diagram, the material may change from solid to gas without passing through the liquid phase. This is a pressure dependent phenomenon.
Solid CO2 at normal atmospheric pressure transits from solid to gas without the liquid phase. But under sufficient pressure, liquid CO2 exists, and is a very useful commercial solvent, e.g. in the removal of caffeine from coffee.
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What causes phase change's to occur?
Phase changes occur when there is a change in temperature or pressure that affects the arrangement of particles in a substance. When a substance gains or loses energy, its particles can move farther apart or closer together, leading to a change in phase (such as melting, freezing, boiling, or condensation) as the substance transitions between solid, liquid, and gas states.
Consider the phase diagram below What phase change occurs as the pressure on the sample at -50ºC is increased from 1 atm to 3 atm?
At -50°C and 1 atm, the substance is in the solid phase. With an increase in pressure to 3 atm, the phase transition will occur from the solid phase to the liquid phase.
What is required for a phase change to occur?
For a phase change to occur, energy needs to be added or removed from the substance. This energy allows the molecules to rearrange their structure and change from one phase to another, such as from solid to liquid, liquid to gas, etc. The temperature and pressure of the substance also play a role in determining when a phase change will occur.
Is a phase change an example of a physical or chemical or nuclear or a covalent change?
A phase change is an example of a physical change, not a chemical, nuclear, or covalent change. During a phase change, the substance undergoes a change in state (solid, liquid, gas) without any change in its chemical composition.
When a solid is heated it will usually change to this phase?
When a solid is heated, it will usually change to the liquid phase. This process is known as melting.
Why does phase change occur in materials?
Changing the temperature or pressure of a material we can change the phase.
What is necessary for a phase change occur?
learn in school dumbys
What happens when water evaporates to vapor?
A change of phase occur, from liquid to gas.
What type of change occur when water changes from a solid to a liquid?
its a phase change
When water boils and evaporates what 3 things change?
A phase change occur, energy is absorbed, water volume decrease.
What must be transfered for any change of state to occur?
Energy must be transferred for any change of state to occur. A change of state is the same as a change of phase and there are four states that include liquid, solid, plasma, and gas.
What causes phase change's to occur?
Phase changes occur when there is a change in temperature or pressure that affects the arrangement of particles in a substance. When a substance gains or loses energy, its particles can move farther apart or closer together, leading to a change in phase (such as melting, freezing, boiling, or condensation) as the substance transitions between solid, liquid, and gas states.
What phase occur after s phase?
G2
What is the first phase change that is most likely to occur as the pressure on nitrogen gas is increased and its temperature is decreased?
Condensation
What are two phase changes that occur when matter loses heat energy?
Two phase changes that occur when matter loses heat energy are: Solid to liquid: When a substance loses heat energy, it can transition from a solid phase to a liquid phase. This process is called melting. Liquid to gas: Another phase change that can occur when matter loses heat energy is the transition from a liquid phase to a gas phase. This process is known as vaporization or boiling.
Consider the phase diagram below What phase change occurs as the pressure on the sample at -50ºC is increased from 1 atm to 3 atm?
At -50°C and 1 atm, the substance is in the solid phase. With an increase in pressure to 3 atm, the phase transition will occur from the solid phase to the liquid phase.
What phase does the lunar eclipse occur?
full moon phase
