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McC TAKS Objective 3

Solid particles vibrate in place, definite volume, definite shape, low energy state
Freezing process by which a liquid changes into a solid, losing energy
Condensation process by which a gas changes to a liquid, losing energy
Melting process by which a solid changes into a liquid, gaining energy
Sublimation process by which a solid changes into a gas without passing through the liquid phase, gaining energy
Liquid Particles are free flowing, no definite shape, definite volume
Matter anything that has mass and takes up space (volume)
Gas Particles move to take up all available space, no definite shape or volume, high energy state
Vaporization process by which liquid changes to a gas, gaining energy
Density The measure of compactness or how much mass is in a particular volume
Proton Positively charged particle in the nucleus of and atom.
Electron Negativley charged particle that exists in an electron cloud formation around an atoms's necleus.
Neutron Electrically neutral particle that has the same mass as a proton and is found in an atom's nucleus.
Atom the smallest component of an element having the chemical properties of the element
Nucleus central region of an atom, contains protons and neutrons, very dense
Compound atoms of different elements join chemically; properties of compounds are different from properties of the individual elements they contain
Electon Cloud area surrounding the nucleus of the atom, contains the electrons located in energy levels
Chemical Reaction bonds in the original substances are broken and new bonds formed; this produces one or more different substances - evidence consists of an unexpected color change, a precipitate forming, bubbles/gas produced, odor or temperature change
Metal At room temperature most metals are hard, shiny solids that can be bent without breaking; good conductors of heat and electricity
Nonmetal At room temperature some nonmetals are solids that crack or break easily; others are gases. At room temperature nonmetals are not shiny and do not conduct heat or electricity very well.
Metalloid have properties of metals and nonmetals;occur along the stairstep line
Physical Change a substance changes but does not become a new substance example: water (liquid) freezing to become ice (solid)
Chemical Change characteristics of a substance that are observed when it reacts (changes) to produce one or more different substances
Endothermic Reactions Chemical reaction in which heat energy is absorbed: temperature decreases
Organic Compound Most compounds that contain carbon, including nucleic acids, proteins, carbohydrates, and lipids.
Product Substance that forms as a result of a chemial reaction.
Reactant Substance that exists before a chemical reaction begins.
Specific Heat the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree C
Atomic Mass (mass number) the number of protons + the number of neutrons in the nucleus
Atomic Number the number of protons in the nucleus
Exothermic Reactions Chemical reaction in which heat energy is released: temperature increases
Created by: MCJH