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When the molecules are heated, they move faster and faster. when we heat particles expand as usually and when we cool, particles contract.

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when any substance is heated, it starts to vibrate faster and faster. When heated, particles expand. When they are cool, particles contract.

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when we heat solids, the atoms start to vibrate faster and faster. when the solid is cool, the particles are closely packed and when it's hot, it's sightly apart but they can only vibrate

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Gas to Liquid= Condensing

the vapor(gas) is allowed to cool down. the particles change back into liquid. Condensing mainly occurs in the atmosphere.  Condensing can happen in the atmosphere, with plants, with fog, with frost and other things.

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Liquid to Solid=Freezing

Liquid(water) can back into solid(ice) by freezing. you can put water into the freezer or by taking it to a cold place. when doing this the molecules lose energy. you can freeze any type of liquids such as soda,juice,water,etc.

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Solid to Gas= Sublimation

Dry ice is a sublimation. It is a solid carbon dioxide. When you melt the dry ice, instead of melting into liquid, it melts into carbon dioxide gas. dry ice is really cold, so when handling it, you would need to wear heavy gloves.

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Gas to Solid=Deposition

Deposition usually occurs during winter months. water vapor transforms into ice without turning into a liquid. the process is known as sub freezing air.

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Liquid to Gas=Boiling

When a liquid is heated, the particles are given more energy and start to move faster and faster as the liquid expands. For example: water(liquid) is heated which is releasing vapor(gas). as the liquid gets hotter and hotter, the particles have enough energy to escape which is the vapor being released. this way the particles of a liquid turn into particles of a solid.

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Gas                Liquid                  Solid

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One state can be changed to another state.
Solid to Liquid=Melt

During this time, the energy increases. For example: when you heat ice(solid), the particles gain energy and start to vibrate faster and faster and change their state. or this case the ice will turn water (liquid).

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Heat is a form of energy that can be transferred from one object to another or even created at the expense of the loss of other forms of energy. heat is caused by the motion of atoms and molecules.

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Heat is produced in several ways by

Solar radiation

Solar radiation is the radiant energy from earth. It gives us light and heat for the earth and energy for photosynthesis. Solar radiation is made up of visible and infrared light.

Rubbing

Rubbing causes the friction to produce heat. Friction causes the molecules on rubbing surfaces to move faster, so they have more energy.

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Burning

When we burn fuels, it starts a process called combustion. this way heat is produced because of the bonds in the fuel store more energy than the bonds in the water and carbon dioxide.

Electricity

Electricity is made up of atoms. So, the electrons bump into atoms on the insulator of the wire, and some of their kinetic energy is given to the atoms as thermal energy. This thermal energy causes the wire to heat up.