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Unit 1

Matter and Its Interactions

TermDefinition
matter Anything that has mass and takes up space.
atom The smallest unit of an element that maintains the properties of that element.
molecule A group of atoms that are held together by chemical bonds; a molecule is the smallest unit of a compound that keeps all the properties of that substance.
property A characteristic of a material.
mass A measure of the amount of matter in an object.
weight A measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe.
volume The amount of space that an object takes up.
conservation of mass The principle that matter can neither be made nor destroyed; rather, it can only be transformed or transferred from one form to another.
mixture A substance that contains two or more substances which are not chemically combined.
pure substance A sample of matter, either a single element or a single compound, that has definite chemical and physical properties.
compound A substance made up of two or more different types of atoms joined by chemical bonds.
solid The state in which a substance maintains a fixed volume and shape. The particles are packed closely together.
liquid The state in which a substance adapts to the shape of its container, and mostly maintains its volume. The particles are touching but they can move past each other.
gas The state in which a substance expands to occupy the volume and shape of its container. The particles are fast moving and can spread apart from each other.
thermal energy The total kinetic energy of a substance's particles.
chemical bond The attractive force that holds atoms or subunits of atoms together.
chemical reaction A process in which one or more substances undergo a change to become a different substance altogether.
Created by: woodallh
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