Physical Science Chapter 2 Study Guide

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Matter
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Any substance that has mass and takes up space.
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Substance
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Matter that is pure and has a specific composition and specific properties.
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Physical Property
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A property of a pure substance that you can observe while keeping it as the same substance.
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Chemical Property
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A property of pure substances that shows its ability to change into other pure substances.
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Element
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A substance that is pure and cannot be broken down further by chemical or physical ways.
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Atom
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The building blocks of elements. They are the basic particles that make up elements.
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Chemical Bond
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The attraction force that binds two atoms together.
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Molecule
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Chemically bonded atoms in groups of 2 or more.
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Compound
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Pure substance that is made up of 2 or more elements in a specific ratio chemically bonded.
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Chemical Formula
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Chemical formulas show the ratio of atoms along with the elements in the compound.
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Mixture
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Chemically not bonded substances that reside in the same place but do not chemically combine.
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Heterogeneous Mixture
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A mixture where you can visually see the different parts of the mixture.
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Homogeneous Mixture
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A mixture that the substances mixed together are not visible.
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Solution
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Another word for Homogeneous mixture.
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Physical Change
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A change in matter where only the substance’s physical appearance or form without changing the substance’s chemical properties.
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Chemical Change
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A change in matter where the substance is changed into one or more different substances and the chemical composition is changed.
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Law of Conservation of Matter
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The Law of Conservation of Matter states that matter can not be created or destroyed using chemical or physical means, only transformed.
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Energy
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the ability to cause change or to do work.
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Temperature
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The measure of average energy that random motion of matter particles create.
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Thermal Energy
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Total energy of every particle in any object.
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Endothermic Change
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A change where energy is absorbed, or taken in.
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Exothermic Change
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A change where energy is released.
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Chemical Energy
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A form of energy that is stored in the chemical bonds between atoms.
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Electromagnetic Energy
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Energy that can travel through space in waves.
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Electrical Energy
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Energy that is created from electrically charged particles transferring and moving from one place to another.
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Electrode
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Two conductive metal strips where electricity enters or leaves the object.

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