Chemistry Chapter 2 Vocab

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scientific method

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scientific method

a logical approach to solving problems by observing and collecting data

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system

a specific portion of matter in a given region of space that has been selected for study

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hypothesis

a testable statement

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model

an explanation of how phenomena occur and how data or events are related

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theory

a broad generalization that explains a body of facts or phenomena

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quantity

something that has magnitude, size, or amount

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SI

a single measurement system called Le Systeme International d'Unites

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weight

a measure of the gravitational pull on matter

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derived units

combinations of SI base units

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volume

amount of space occupied by an object

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density

the ratio of mass to volume, or mass divided by volume

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conversion factor

a ratio derived from the equality between two different units

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dimensional analysis

a mathematical technique that allows you to use units to solve problems

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accuracy

the closeness of measurements to the correct value of quantity measured

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precision

the closeness of a set of measurements of the same quantity made in the same way

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percentage error

calculated by subtracting the accepted value from the experimental value

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significant figures

consists of all the digits known with certainty, plus one final digit, which is estimated

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scientific notation

numbers written in the form M x 10^n, M is greater or equal to 1, but less than 10. N forms the number.

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directly proportional

two quantities that can be divided by each other and give a constant value

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inversely proportional

dividing the difference by the accepted value, and then multiplying by 100

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