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UNIT ONE chemistry

chemistry Unit One

TermDefinition
accuracy refers to how close a measured value is to an accepted value
chemistry the study of matter and the changes it undergoes
conclusion a judgement based on the information obtained
control in an experiment, the standard that is used for comparison
experiment a set of controlled observations that test a hypothesis
hypothesis a tentative, testable statement or prediction about what is being observed
independent variable in an experiment, the variable that the experimenter plans to change
mass measure that reflects the amount of matter
model visual, verbal, and/or mathematical explanation of data collected from many experiments
base unit defined unit in a system of measurement that is based on an object or event in the physical world and is independent of other units
qualitative data information describing color, odor, shape of some other physical characteristic
quantitative data numerical information describing how much, how little, how big, how tall or how fast
scientific law describing a relationship in nature that is supported by many experiemtns
scientific method a systematic approach used in scientific study; an organized process used by scientists to do research and to verify the works of others
theory explanation supported by many experiments; is still subject to new experimental data, can be modified, and is considered valid if it can be used to make predictions that are proven true.
weight measure of an amount of matter and also the effect of Earth's gravitational pull on that matter.
dependent variable in an experiment, the variable that depends on the independent variable
conversion factor ratio of equivalent values used to express the same quantity in different units. it is always equal to one and changes the unit without changing its value
density the amount of mass per unit of volume; a physical property
derived unit a unit defined by a combination of base units
dimensional analysis systematic approach to problem solving that uses conversion factors to move from one unit to another
error differences between an experimental value and an accepted value
graph visual display of data
kelvin SI unit of temperature
kilogram SI base unit of mass
liter metric unit for volume; is equal to 1 cubic decimeter
meter SI unit for length
percent error ratio of an error to an accepted value
precision refers to how close a series of measurements are to one another, show little variation over a series of trials, but might not be accurate
scientific notation express any number as a number between 1-10 (coefficient) multiplied by 10 raised to a power (exponent)
second SI base unit for time
significant figure number of all known digits represented in a measurement plus 1 estimated digit
Created by: mrsklann