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| The smallest particle in the universe |
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| A pure substance made up of one type of atom |
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| Sub-atomic particle located in the nucleus with no charge |
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| Sub-atomic particle located outside the nucleus with a negative charge |
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| Sub-atomic particle located in the nucleus with a positive charge |
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| Electrons on the outermost shell that bond with other atoms |
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| When elements or compounds are combined physically |
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| When parts of a mixture can be pulled out of a substance Ex. pizza |
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| When particles are completely mixed into a substance, cannot be separated. Ex. sweet tea |
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| Physical property that can be found by dividing mass/volume |
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| Physical property that can be found by dividing mass/volume |
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| Chemical property that describes how likely an element is to react violently to another element |
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| Chemical property explaining how poisonous the element is |
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| Chemical property describing how likely an element is to catch fire |
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Definition
| On the right side of a chemical equation; after a chemical reaction |
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| On the left side of a chemical equation; before a chemical reaction |
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| Number in front of an element or compound in a chemical equation Ex. 6NaCl |
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| Number located below an element saying how many atoms the element has |
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| When two or more elements combine |
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| Law of Conservation of Mass |
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Definition
| Matter cannot be created or destroyed |
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Definition
| Elements are organized by atomic number and similar properties |
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| Group on the Periodic Table that are poor conductors, less reactive than other groups |
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| Largest group on Periodic Table that are great conductors; most reactive group |
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| Group on Periodic Table that share properties with metals & non-metals |
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| Divide elements on Periodic Table based on similar physical and chemical properties |
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Definition
| Chemical reaction where heat is absorbed |
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| Chemical reaction where heat is released |
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| Property that describes a substance without changing its identity |
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A change that occurs where the substance remains the same, but in a different state
Ex. liquid water - ice - steam |
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| Properties only observed during a chemical change |
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| Change where a substance becomes a different substance. Cannot be reversed. |
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| Where valence electrons are shared between a metal & a non-metal |
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| Where valence electrons are shared between non-metals |
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