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# Honors Chem Ch 2

Hypothesis A testable statement
Model An explanation of how phenomena occur and how data or events are related
Scientific Method A logical approach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses, and formulating theories that are supported by data
System A specefic portion of matter in a given region of space that has been selected for study during an experiment or observation
Theory A broad generalization that explains a body of facts or phenomena
Conversion Factor A ratio derived from the equality between two different units that can be used to convert from one unit to the other
Density The ratio of mass to volume or mass divided by volume
Quantity Something that has magnitude, size, or amount
SI The measurement system accepted worldwide
Volume The amount of space occupied by an object
Weight A measure of the gravitational pull on matter
Accuracy The closeness of measurements to the correct or accepted value of the quantity measured
Direct Proportion Two quantities that give a constant value when one is divided by the other
Inverse Proportion Two quantities that have a constant mathematical product
Percent Error A value calculated by subtracting the experimental value from the accepted value, dividing the difference by the accepted value, and then multiplying by 100
Precision The closeness of a set of measurements of the same quantity made in the same way
Scientific Notation numbers written in the form Mx10^n where the factor M is a number greater than or equal to 1 but less than 10 and n is a whole number
Significant Figure Any digit in a measurement that is known with certainty plus one final digit, which is somewhat uncertain or is estimated
Created by: kost