Unit 1 Vocabulary

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Qualitative observations

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Quantitative observations:

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Matter

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Defined as anything that has mass and volume (takes up space).

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Physical property

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Chemical property

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Atoms

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Tiny particulates that compose all matter.

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Acid

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any substance that in aqueous solution tastes sour and changes blue litmus paper to red. Acids react with some metals to liberate hydrogen, react with bases to form salts, promote chemical reactions, and have a pH less than 7.

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Base

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any substance that in aqueous (water) solution is slippery to the touch, tastes bitter, changes the color of indicators (e.g., turns red litmus paper blue), reacts with acids to form salts, promotes certain chemical reactions (base catalysis), and has a pH greater than 7 

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Element

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Pure Substance

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