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Chem II Vocab

Chapter 2 Words

TermDefinition
scientific method a series of steps followed to solve problems, including collecting data, formulating a hypothesis, testing the hypothesis, and stating conclusions
system a set of particles or interacting compounds considered to be a distinct physical entity for the purpose of study
hypothesis an explanation that is based on prior scientific research or observations that can be tested
model a pattern, plan, representation, or description designed to show
theory an explanation for some phenomeon that is based on observation, experimentation, and reasoning
quantity something that has magnitude, size, or amount
SI Le Systeme International d' Unites, or the Intieration System of Units, which is the measurement system that is accepted worldwide
weight a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe
derived unit a unit of measure that is a combination of other measurements
volume a measure of the size of a body or region in 3-dimensional space
density the ratio of the mass of a subtance to the volume of the substance; often expressed as grams per cubic centimeter for solids and liquids and as grams per liter for gases
conversion factor a ration that is derived from the equality of two different units and that can be used to convert from one unit to the other
dimensional analysis a mathematical technique for studying dimensions of physical quantities
precision the exactness of a measurement
percentage error a figure that is calculated by subtracting the accepted value from the experiment value, dividing the difference by the accepted value, and then multiplying by 100
significant figures a prescribed decimal place that determines the amount of rounding off to be done based on the precision of the measurement
scientific notation a method of expressing a quantity as a number multiplied by 10 to the appropriate power
direct proportion the relationship between two variables whose ration is a constant value
inverse proportion the relationship between two variables whose product is constant
Created by: emmeyer
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