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matter and energy

unit 1, lesson 1-6

matter anything that has mass and takes up space
mass describes the amount of matter in an object
weight a measure of the gravitational force on an object
volume the amount of space that an object takes up, or occupies, is known as the object
density a measure of the amount of mass in a given volume
physical property a characteristic of a substance that can be observed and measure without changing the identity of the substance
chemical property describes a substance ability to change into a new substance with different properties
physical change the change that affects one or more physical properties of a substance
chemical change occurs when one or more substances change into entirely new substances with different properties
law of conversation of mass states that in ordinary chemical and physical changes, mass is not created or destroyed but is not transformed into different sunstances
atom the smallest unit of an element that maintain the properties of that element
elements made up of one or more of the same kind of atom chemically combined
compound made up of different kinds of atoms chemically combined
mixture contains a variety of elements and compounds that are not chemically with each other
pure substance a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity
heterogeneous one that does not have a uniform composition
homogeneous a mixture of each part of the sugar-water mixture
solid the particles in a solid are close together and do not move freely.
liquid particles in liquid, have more kinetic energy than particles in a solid do.
gas a substance in gaseous state has particles with the most kinetic energy of the three states
freezing the change in state in which a liquid becomes a solid
melting the change of state from a solid to a liquid
evaporation a liquid is warmed, its particles gain energy. some particle gain enough energy that they escape from the surface of the liquid and become a gas.
boiling a rapid change from a liquid to a gas, or vapor
condensation the change from a gas to a liquid.
sublimation the change from a solid state directly into a gas.
deposition the change in state from a gas directly to a solid.
Created by: 18bmartinez0209