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chapters 1 through 9

Chemistry the study of matter and the changes that it undergoes.
matter anything that has mass and takes up space.
mass a measurment that reflects the amount of matter.
weight a measure not only of the amount of matter but also of the effect of Earth's gravitational pull on that matter.
scientific method a systematic approach used in scientific study, whether it is chemistry, biology, physics, or other sciences.
qualitative data information that describes color, odor, shape, or some other physical characteristics.
quantitative data the numerical information that tells you how much, how little, how big, how tall, or how fast something is.
hypothesis a tentative explanation for what has been observed.
experiment a set of controlled observations that test the hypothesis.
independent variable the variable that you plan on changing.
dependent variable because its value changes in response to a change in the independent variable.
control a standard for comparison.
model a visual, verbal, and or mathematical explanation of experimental data.
theory an explanation that has been supported by many, many experiments.
scientific law a relationship in nature that is supported by many experiments.
pure research seeks to gain knowledge for the sake of knowledge itself.
applied research research undertaken to solve a specific problem.
technology the practical use of scientific information.
base unit a defined unit in a system of measurement that is based on an object or event in the physical world
second(s) the SI base unit for time.
meter the SI base unit for length.
kilogram the SI base unit for mass
dereved unit a unit that is defined by a combination of base units.
liter the metric unit for volume equal to one cubic decimeter.
density a ratio that compares the mass of an object to its volume.
kelvin the SI base for temperature
scientific notation expresses numbers as a multiple of two factors: a number between 1 and 10; and ten raised to a power or exponent.
conversion factor a ratio of equivalent values used to express the same quantity in different units.
dimensional analysis a method of problem-solving that focuses on the units used to describe matter.
accuracy refers to how close a measured value is to an accepted value.
percision refers to how close a series of measurements are to one another.
percent error the ratio of an error to an accepted value.
signification figure all known digits plus one estimated digit.
raph a visual display of data.
substance matter that has a uniform and unchanging composition.
physical property a characteristic that can be observed or measured without changing the sample's compostion.
extensive properties are dependent upon the amount of substance present.
intensive properties independent of the amount of substance present.
chemical properties the ablitiy of a substance to combine with or change into one or more other substance.
states of matter three different forms of matter: solid, liquid, gas.
solid a form of matter that has its own definite shape and vloume.
liquid a form of matter that flows, has consistent volume, and takes the shape of its container.
gas a form of matter that flows to conform to the shape of its container and fills the entire volume of its container.
Created by: kittyboo27