Physical Science Chapter 2 Study Guide

Matter
Any substance that has mass and takes up space.

Substance
Matter that is pure and has a specific composition and specific properties.

Physical Property
A property of a pure substance that you can observe while keeping it as the same substance.

Chemical Property
A property of pure substances that shows its ability to change into other pure substances.

Element
A substance that is pure and cannot be broken down further by chemical or physical ways.

Atom
The building blocks of elements. They are the basic particles that make up elements.

Chemical Bond
The attraction force that binds two atoms together.

Molecule
Chemically bonded atoms in groups of 2 or more.

Compound
Pure substance that is made up of 2 or more elements in a specific ratio chemically bonded.

Chemical Formula
Chemical formulas show the ratio of atoms along with the elements in the compound.

Mixture
Chemically not bonded substances that reside in the same place but do not chemically combine.

Heterogeneous Mixture
A mixture where you can visually see the different parts of the mixture.

Homogeneous Mixture
A mixture that the substances mixed together are not visible.

Solution
Another word for Homogeneous mixture.

Physical Change
A change in matter where only the substance’s physical appearance or form without changing the substance’s chemical properties.

Chemical Change
A change in matter where the substance is changed into one or more different substances and the chemical composition is changed.

Law of Conservation of Matter
The Law of Conservation of Matter states that matter can not be created or destroyed using chemical or physical means, only transformed.

Energy
the ability to cause change or to do work.

Temperature
The measure of average energy that random motion of matter particles create.

Thermal Energy
Total energy of every particle in any object.

Endothermic Change
A change where energy is absorbed, or taken in.

Exothermic Change
A change where energy is released.

Chemical Energy
A form of energy that is stored in the chemical bonds between atoms.

Electromagnetic Energy
Energy that can travel through space in waves.

Electrical Energy
Energy that is created from electrically charged particles transferring and moving from one place to another.

Electrode
Two conductive metal strips where electricity enters or leaves the object.