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What's this Alien? you have three questions about me? well let me answer them.  this topic is relevant today because it helps people understand how things happen and what happens to the matter. All of this information i knew already and none of this information is new. This has taught me a lot about science and it has changed my view in this world.

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Greetings alien! We come in peace .You are probably wondering what are some things about science? Let me tell you then you will be a very smart alien!

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A phisical change is when somethings shape/size looks different but it still has the same matter and a chemical change means the matter completely changes and the matter has changed. But it should always the have the same mass before and after a phisical and chemical change.

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Let me tell you about matter and atoms. atoms are so small that no one can see them! Everything is made out of atoms except dreams and thoughts. atoms are made out of protons, neutrons, and electrons. electrons have negative charge, protons have positive charge, and neutrons have no charge.

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Th law of conservation of mass is very important! it means that matter cannot be created or destroyed no matter what. Even though the matter looks like its gone it is still there even though we cant see it.

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Phisical properties are used to describe some. For example : a apple is red. there usually used to seen if something is a phisical or chemical change.

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Endothermic and exothermic are 2 different temperatures. Exothermic means the temperture is hot and endothermic means that the tempeture is cold.