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That is really hard to answer... There is no ONE thing that changes when a change of state occurs because one thing leads to another... If I had to give one answer, I'd have to say energy changes.
When a atom or molecule changes state, it can gain energy (liquid to gas or solid to liquid for example) and the bonds are stressed (more of a springy effect) between the protons to electrons as well as covalent and ionic bonds. So the stability decreases while the size of the element or compound increases.
A good example of this is leaving a water bottle outside in the sun. The sun adds energy to the water, making it turn into a gas, the gas increases the pressure inside the bottle, thus making the bottle expand.
*If you think about frozen water expanding the bottle it will trip you up. Water is special in that it expands when it freezes as well. I can't think of a common example for expansion right now other than water.*
The electrons/ "vibrations" of the atoms also increase in speed.
When they lose energy (gas to liquid, liquid to solid), the size decreases as does the speed of the electrons/ vibrations. Hence why absolute zero has no electron movement at all. Generally this also strengthens the bonds of the compounds because the bonds are not as stressed. They are more stable.
So, simple one word answer? Energy.
What else can I help you with?
Is melting a change to metal physical changes?
melting is a physical change. freezing is also a physical change. the only thing that changed was the state of matter. a chemical change for example is buring, the substance changes to co2 and h2o.
True or false a physical change occurs when matter changes state as form a liqued to a gas?
True. A physical change occurs when matter changes state without altering its chemical composition. In this case, the change from a liquid to a gas involves only changes in physical properties such as volume, shape, and density.
What is any change in matter that changes its physical form called?
A change in matter that changes its physical form is called a physical change. This type of change does not alter the chemical composition of the substance, but only its physical properties such as shape, size, or state (solid, liquid, gas).
Does a change of state result in a change in mass?
No. Physical and chemical changes do not result in less mass, only different arrangements of the atoms and molecules. Changing mass requires either a nuclear reaction such as decay or fusion, or adding very large amounts of energy to the atomic particles (which increases their apparent mass under special relativity).*Also, technically, there is less mass in a positive ion than in a negative ion, because electrons have been removed to create a positively-charged atom, and added to create a negatively-charged ion. But no mass is lost or converted, only the movement of practically negligible mass from atom to atom.
Is evaporation a physical chqnge?
Yes, evaporation is a physical change. It is the process in which a liquid changes into a gas without changing its chemical composition, only its physical state.
Is melting a change to metal physical changes?
melting is a physical change. freezing is also a physical change. the only thing that changed was the state of matter. a chemical change for example is buring, the substance changes to co2 and h2o.
Is melting a physical change to metal?
melting is a physical change. freezing is also a physical change. the only thing that changed was the state of matter. a chemical change for example is buring, the substance changes to co2 and h2o.
Is the conversion of liquid water into gaseous water is a chemical change?
No, the conversion of liquid water into gaseous water is a physical change, not a chemical change. This process, known as evaporation, involves only a change in the physical state of the water molecule, not its chemical composition.
Does an object changes its mass when it changes to gas?
Actually no, the only thing that changes is the density. The mass doesn't change when it's changing states.
How does a baby cheetah change as it grows?
it's behavor and it s size is the only thing that changes
Is water being boiled a chemical change or physical change?
It is a physical change because the water only changes its state from liquid to gas.
What is it when water changes to water vapor?
When water changes to water vapor, it has changed its state from liquid to vapor and no chemical change has taken place. It's only a physical change.
Is Boiling oil a physical change or a chemical change?
Physical ... it's only a state change. Cool it and it reverts to its old condition.
How does fashion influence change?
The only thing fashion influences changes in is the clothes people wear, fashion is more a expression of change than a vehicle of it.
Melting of ice chemical or physical change?
The melting of ice is a physical change because it does not alter the chemical composition of water. When ice melts, it transitions from a solid state to a liquid state, but the molecules remain the same.
when a candle is alight what is its physical change?
The wax melts and vaporizes, these changes are physical changes caused by te flame. They are a change in state only, and in these no new substance is formed. The chemical change is the combustion of the wax and the wick
True or false a physical change occurs when matter changes state as form a liqued to a gas?
True. A physical change occurs when matter changes state without altering its chemical composition. In this case, the change from a liquid to a gas involves only changes in physical properties such as volume, shape, and density.
