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Solid is when something is touchable, not a liquid or gas. A solid can also be moved and be lifted, something a liquid nor gas can do.

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Reversible is when something can be changed back to it's original form.
eg. Water to ice and ice to water.

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Irreversible is when you mix two or more materials together to form another material, and you can't change the new material back to its original state.
For example if you use yeast, water, sugar and flour to make bread, you can't change it back to the original ingredients.

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Liquid has a certain consistency and certain properties that other materials don't have.
Some facts about liquid is that you can't pick it up with your bare hands without it starting to fall out of your hands. Liquid can also take shape into any container you can put it in.

A few other words for "liquid" are runny and fluid

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evaporation is when a liquid is heated so much that it becomes a gas.

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to manipulate is to change a material to create a more suitable object, like to change water into ice

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Being able  be turned back (reversed) to the way it was originally.

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The simpliest form of chemical that is usually made by a group of atoms.
SAMPLE:

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A physical substance that is in the universe.
SONG:

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Matter Chatter (song for kids about solids, liquids, and gases)

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A gas or liquid being able to spread into a nearby substance.

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1.)Dissolving

A solid become's or cause to become incorporated into a liquid so as to form a solution.

"Hydrocloric Acid Dissolves a piece of metal easily. "
Fe(s)+2HC1(aq)--FeCI2+H2(g)
2.) Molecules
A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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Evaporating - where a liquid will get so hot that it turns into a gas eg: when water heats up it will evaporate. Another way of saying evaporate is condensate which is a part of the water cycle.

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Dissolving - where a solid starts to combine with a liquid making it "dissolve". Also the solid will change the liquid into a different liquid or look and taste.

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A solid is something that you can touch. It is one of the three                states of matter. They are Solid, Liquid and gas. Solids take a proper shape, liquids take the shape of the container and gases fills the container. A solid material is wood, plastic, metal, stone etc.

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Something irreversible is something that can’t change back to what it was before. For example, cake can’t turn back to just sugar, water, flour, eggs etc. The opposite of irreversible is reversible. When something is reversible, it can change back to what it was before. Ice is reversible because it can turn back to water.

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Condensation is the opposite of evaporation. When water vapour in the air makes gas more concentrated, it turns back into liquid form, leaves the atmosphere and returns to the surface of the earth. Usually, in order for condensation to happen, the atmosphere must be holding as much water or moisture as can be absorbed.

Example: Condensation can be formed when standing from cold air to hot air, when the atmosphere is holding a lot of water or moisture.

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Evaporation is when the sun heats up, the water in rivers, lakes, oceans go into the air it turns into vapour or steam. Water vapour goes to the air , then leaves the rivers, lakes and oceans.

Example: Water can be turned into steam when the sun shines on it.  This is called evaporation.

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Firm and stable in shape; not liquid or fluid.

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An air fluid substance which expands freely to fill any space available.

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Evaporation is when a substance (water, solid etc.) turns into a gas like mist, smoke, fog etc.

Example :
Boiling Water can evaporate into steam

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Reversible means when a substance turns into something else but is also able to go back to it's starting / original form.
Example :
Water -> Ice -> Water (Water can freeze into ice but then the ice is able to melt back into water)

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A solid is an object that can be physically held in your hand. It can be formed by liquids such as water and melted.

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A reversible change means a change that can be reversed.
(i.e. water freezes into ice with thaws into water again.)

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Irreversible means that a material becomes a material and it cannot go back. For example: Glass is melted sand which cannot go back and it will be glass forever.

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Reversible change is a material that can be changed to what it was before. For example: Ice can become water if you put it somewhere warm and if you put water in a cold place it will become ice again.

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Tania
If the shape of the substance changes, but there is no change in the molecule structure, it is a physical change.
If the shape of the substance does not change, but there is change in the molecule structure (there is something added to the substance e.g orange juice) , it is a chemical change.
Example:
Water to ice - the ice is still water only in a different form. (physical change)
Water with orange juice - the water is mixed with the juice  making it a different molecule structure.

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Chemical Change means that you can not change the object back to its original form.

For example: You boil water to make steam and then you cant freeze it to back to become water.

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Physical Change means that a object can turn back to its original form. Which is also reversible in other words

For Example: water freezes and turns into ice and can melt and turn back to water again.

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The process of something becoming a solid. This happens through cooling, drying out and crystallization.
E.g. When lava flows out of a volcano it is molten rock. As it cools it becomes igneous rock.

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Evaporation is when a liquid turns into a gas.
E.g. When you use a kettle to boil water, you can see the steam rising out of the kettle  as the water boils.

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Condensation is the process of changing from a gas to a liquid.

For Example: She stepped out of a air - conditioned room into the hot air outside and immediately condensation started forming on her glasses. This usually happens when it is humid too.

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Solubility is the measurement of how much a substance (scientifically called the solute) can dissolve in a liquid substance (scientifically called the solvent) to form a  solution that cannot dissolve anymore of the solute. Different solutes have different solubility levels depending on what temperature it is under and the pressure of the air.

Example: Salt dissolves easily and completely in water, and so it has a high solubility level.