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8th Grade Chapter 2

Introduction to Matter

QuestionAnswer
kinetic energy energy of matter in motion
elements substances that cannot be broken down chemically into other substances
weight the measurement of the force of gravity on an object
mass the measurement of how much matter an object contains
atoms extremely small particles that all elements are composed of
energy the ability to do work or cause change
chemical bonds holds atoms together in a molecule
matter anything that has mass and takes up space
SI unit for mass kilogram
solution an example of a homogeneous mixture that is very evenly mixed
volume the amount of space that matter occupies
to calculate density mass divided by volume
endothermic change a change in which energy is taken in
exothermic change a change in which energy is given off
pure substance table sugar and salt
element oxygen and copper
exothermic change fireworks (energy is given off)
endothermic change ice melts (energy is absorbed)
chemical property if it easily catches on fire
physical change dissolving salt or sugar in water
states of matter liquid water, ice, and water vapor (liquid, solid, and gas)
physical property boiling point
every chemical or physical change includes a change in energy
electromagnetic energy radio waves, visible light, infrared rays, ultraviolet rays, x-rays
chemical change rust forming, gas burning, using electricity to break down water into hydrogen and oxygen, burning wood
volume of an irregular object submerge object in water in a graduated cylinder
mixtures soil, salad, sugar water, and lemonade
Created by: Mrs. Gordon
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