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Oxygen is an element

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oxygen is and element

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OXYGEN IS AN ELEMENTS

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hydrogen is an element

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Salt is a mixture of sodium and chlorine

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I learned About molecules

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I learned that with a compound a chemical change takes place and a mixture is a physical

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I learned that solids,liquids,and gas can all blend in a homogenous and heterogeneous.

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I learned that sodium and chemical are elements

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it is hard to break up a compound

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I learned that hydrogen is a element.

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i learned that sodium is a  chemical element

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oxygen and hydrogen are elements

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Oxygen is a elements

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Oxygen,Hydrogen,atom,and chlorine gas are all elements.

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a chemical element is sodium

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I learn the element and molecules are a mix of substance.