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Chemistry review

Matter What everything is composed of
Atom The simplest particle of an element
Proton A subatomic particle that has a positive charge and that is found in the nucleus of an atom
Neutron A subatomic particle that has no charge and that is found in the nucleus of an atom
Electron A subatomic particle that has a negative charge
Cohesion an attraction between molecules of the same substance
Surface Tension A measure of how difficult it is to stretch or break the surface of a liquid
Element A pure substance that cannot be broken down chemically into simple kinds of matter
A compound a pure substance made up of two or more elements
A molecule the simplest part of a substance that still has all of the properties of that substance.
Valence Electron Electrons on the outermost energy level of an atom
Mixture A combination of two or more substances that are not chemically combined
homogenous mixture (solution) a mixture that is the same in its properties throughout given samples
heterogeneous mixture A mixture that is not the same in composition; components are not evenly distributed throughout the mixture
Solute is the substance dissolved in the solution.
Solvent is the substance in which the solute is dissolved
Water the universal solvent
Periodic Table an arrangement of elements in which the elements are separated into groups based on a set of repeating properties
Chemical Symbol A one or two letter representation of an element
Atomic number number of protons of an element
Atomic mass the number of protons and neutrons added together
Period A horizontal row of elements in the periodic table
Group Vertical column in the periodic table
Reactivity How readily a substance combines chemically with other substances.
Metals Elements that are good conductors of electric current and heat.
Non-Metals Low conductivity - not ductile - not malleable - brittle - dull - gas at room temp
Mettalloids elements with some of the properties of metals and some of the properties of non-metals. Found along the zig zag line
Chemical Formula A combination of chemical symbols and numbers to represent a substance
Subscript A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
Yields represented by an arrow in a chemical equation
Chemical Property A characteristic of a pure substance that describes its ability to change into different substances
Physical Property A characteristic of a pure substance that can be observed without changing it into another substance
Chemical Change A change in matter that produces one or more new substances
Physical Change A change in a substance that does not involve a change in the identity of the substance
Reactant A chemical substance that is present at the start of a chemical reaction
Product A substance produced in a chemical reaction
combustible capable of catching fire or burning
malleable easy to shape or bend
ductile A term used to describe a material that can be pulled out into a long wire.
Oxidation A chemical change in which a substance combines with oxygen - as when iron oxidizes forming rust
Law of Conservation of mass matter cannot be created or destroyed - it is all still present.
balanced equation a chemical equation in which mass is conserved; each side of equation has the same number of atoms of each element
precipitate A solid that forms from a solution during a chemical reaction
Created by: user-1688306
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