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### 42 Cards in this Set

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 The Scientific method A logical approach to solving problems by observing and collecting data, formulating hypothesis, testing hypothesis, and formulating theories that are supported by data Observing Uses the senses to obtain information qualitative discriptive data quantitative numerical data System A system is a specific portion of matter in a give region of space that has been selected for study during an experiment or observation. Hypothesis A testable statement constant during an experiment the conditions that remain constant variable In an experiment the condition that changes Model A model in science is more than a physical object. It is often an explanation of how phenomena occur and how data and events are related Theory A broad generalization that explains a body of facts or a phenomena Quantity Something that has size, magnitude, and amount. SI Le systeme International d'Unites Weight the measure of the gravitational pull on matter Derived Units Combinations of SI base units Volume the amount of space occupied by and object. Density The ratio of mass to volume, or mass divided by volume. Conversion factor a ratio derived from the equality between two different units that can be used to convert from one unit to the other Dimensional analysis a mathematical technique that allows you to use units to solve problems involving measurements. Accuracy the closeness of a measurement to the correct or accepted value of the quantity measured Precision to closeness of a set of measurements of the same quantity made in the same way Significant Figures in a measurement consists of all the digits known with certainty plus one final digit, which is uncertain or estimated Scientific notation numbers are written in the form of M x 10^n, where the factor M is a number greator then or equal to one but less than 10 and n is a whole number Directly proportional two quantities are """"" to each other if dividing one by the other gives a constant value Inversely proportional two products are """""to each other if their product is constant Area (equation) length x width Volume (equation) length x width x height Density (equation) Mass/volume Energy (equation) force x length Molar mass (unit) Kilograms per mole, Kg/m^3 Molar volume (unit) cubic moles per mole, m^3/mol Area (unit abbr.) m^2, square meter Volume (unit abbr.) m^3, cubic meter Density kilograms per cubic meter, kg/m^3 Tera T, 10^12 Giga G, 10^9 Mega M, 10^6 Kilo k, 10^3 Hecto h, 10^2 deci d, 10^-1 centi c,10^-2 milli m, 10^-3 Percentage error (equation) Percentage error= Value experimental-Value accepted/value accepted X100