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Chem - Unit #1

Introduction to Chemistry

chemistry the study of matter and how it changes
matter anything that has mass and takes up space
substance matter that has specific composition and properties (aka: chemical)
mass the amount of matter
model a visual representation of something
weight mass + gravitational force
quantitative data information that describes how much, how tall, how fast, how little (numbers)
qualitative data information that describes odour, colour, taste, shape or other physical properties (language)
hypothesis a testable statement made about what has been observed
experiment an activity that allows you to create controlled observations to test a hypothesis
conclusion a judgement that is made based on the information obtained from the experiment
independent variable the variable that is changed during an experiment
dependent variable the variable that changes because of a change in the experiment
control the standard that is used for comparison in an experiment; nothing about it is changed
scientific law a relationship in nature that is supported by many experiments
theory an explanation that is supported by many experiments but can be changed with new information; if it can be used to make predictions that are proven true, it is seen as correct
applied research research that is conducted for a specific reason or to solve a specific problem
chance discovery scientific discovery that happens by accident; it is not intended
pure research research that is conducted because of curiosity or interest
synthetic something that is human-made and may not occur in nature
technology a practical use of scientific information
scientific method the organised process used by scientists to do research and verify the work of others
base unit a unit that is based on an object or event in the physical world
derived unit a unit that is based on two or more other units
accuracy how close a measured value is to an accepted value
precision how close a series of measurements are to one another
dimensional analysis an approach to problem solving that uses conversion factors to move between units
conversion factors a ratio of equal values with different units
density a physical property of matter; the amount of mass per unit of volume
volume the space occupied by an object
interpolation estimating an unknown value that is between two known values
extrapolation estimating an unknown value that is outside the known values
macroscopic large enough to be seen without any assistance
microscopic too small to be seen without a microscope
submicroscopic too small to be seen without using a specialised microscope
Created by: nursprung



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