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S8P1.a

Distinguish between...

TermDefinition
Atom the smallest unit of an element that maintains the properties of that element.
Element A substance that cannot be broken down or separated into simpler substances by chemical mean.
nucleus in physical science, an atoms central region, which is made up of protons and neutrons.
proton a substance particle that has a positive charge and thats found in the nucleus of an atom.
neutron a substance particle that has no charge and that is found in the nucleus of an atom.
electron a substance particle that has a negative charge
atomic number the number of protons in a nucleus of an atom; the atomic number is the same for atoms of an element.
neutral having no overall change
atomic mass the mass expressed of an atom in atomic mass units.
chemical symbol one of two letter code that represents an element
pure substance a sample of matter either single element or a single compound, that was definite chemical & physical properties.
compound a substance made up of atoms of two or more different elements joined by chemical bonds
molecule the smallest unit of substance that keeps all of the physical and chemical properties of that substance.,
chemical formula a combination of symbols and number to represent a substance
subscript a small number written to the right and slightly below a chemical symbol to tell the number of atoms of the element in the substance.
mixture a combination of two or more substance that are not chemically combined.
state of matter the physical forms of matter, which include solid, liquid, & gas.
solid the state of matter in which the volume and shape of a substance are fixed
liquid the state of matter that has definite volume but not a definite shape.
gas a form of matter that does not have a definite volume or shape
melting point temperature at which a solid changes into a liquid
vaporization process in which a liquid changes into a gas
boiling point temperature at which a liquid vaporizes and changes into a gas
condensation the change of state from gas to liquid
freezing point temperature at which a liquid changes into a solid
sublimation the process in which a solid changes directly into a gas
phase-change diagram drawing that shows the relationships among temperature and changes of state
plasm a state of matter that forms when temperatures are high enough to completely remove electrons from the atoms to which they were bound
physical property a characteristic of a substances that does not involve a chemical change, such as density, color, or hardness.
density the ration of the mass of substances the variable of the substance
chemical property a property of matter that describes a substances to the volume of a substance
physical change a change of matter from to another without a change in chemical properties
chemical change a change that occurs when one or more substances change into entirely new substances with different properties
chemical reaction the process by which one or more substances change to produce one or more substances
precipitate a solid thats produced as a result of a chemical reaction
combustion reaction a chemical reaction that occurs when oxygen combines with another substance
periodic table a chart that organizes information about all of the known elements according to their properies
period in chemistry, a horizontal row of elements in the periodic table
group a vertical column of elements in the period table ; elements a group share chemical properties
valence electrons an electron that is found in the out most shell of an atom and that determines the atoms chemical properties
reactivity describes how likely an element is to form bonds with other elements
metalloid elements that have properties of both metals and non metals
inert unable to react chemically under normal subtances
law of conservation of matter states that during chemical reaction, matter cannot be created or destroyed, it will only change from one form to another
reactant a substance of molecule that participates in a chemical reaction
product a substance that forms in a chemical reaction
coefficient a number written before a chemical formula which shows how many molecules of a compound are present
Created by: 11ZaaMah