Unit 1 Vocabulary

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Qualitative observations

Back

describe the quality of an object, such as an objects color, shape, and size (uses words) 

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Quantitative observations:

Back

measure the amount of an object, such as weight or height (uses numbers) All matter is composed of tiny particulates called atoms (particulate nature of matter). 

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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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A characteristic of matter that can be observed or measured without changing the substance.

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Chemical property

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A characteristic of matter that can be observed only with a change or an attempt to change the chemical make-up or structure of the substance.

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Atoms

Back

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

Back

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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a pure substance that is made up of one type of atom 

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Pure Substance

Back

one type of substance (element or compound).