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### 20 Cards in this Set

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 System specific portion of matter in a given region of space that has been selected for study during an experiment or observation --when you observe a reaction in a test tube, the test tube and its contents form a system Scientific Method logical approach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses, and formulating theories that are supported by data Hypothesis testable statement Model in science is more than a physical object; it is often an explanation of how phenomena occur and how data or events are related --may be visual, verbal, or mathematical Theory a broad generalization that explains a body of facts or phenomena Quantity something that has magnitude, size, or amount --not the same as measurement; quantity represented by a teaspoon is volume SI scientists all over the world have agreed on a single measurement system called Le Systeme International de Unites Weight a measure of the gravitational pull on matter Derived units combinations of SI base units Volume the amount of space occupied by an object Density the ratio of mass to volume MASS DIVIDED BY VOLUME D=M/V Conversion factor a ration derived from the equality between two different units that can be used to convert from one unit to the other Dimensional analysis mathematical technique that allows you to use units to solve problems involving measurements Accuracy refers to the closeness of measurements to the correct or accepted value of the quantity measured Precision refers to the closeness of a set of measurements of the same quantity made in the same way Percentage error is calculated by subtracting the accepted value form the experimental value, dividing the difference by the accepted value, and then multiplying by 100 PE = Ve - Va / Va X 100 Significant figures in a measurement consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated Scientific notation numbers are written in the form M x 10^n--where the factor M is a number greater than or qual to 1 but less than 10 and is a whole number 65000 = 6.5 x 10^4 Directly proportional to each other if dividing one by the other gives a constant value --if the masses and volumes of diff. samples of aluminum are measure, the masses and vulumes will be directly proportional to each other Inversely proportional two quantities are ----- to each other if their product is constant