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Chemistry Vocabulary

Atom The smallest part of an element that has the chemical properties of the element.A single atom has mass and takes up space.
Matter Anything that has composition and made up of atoms.(Solid,Liquid,and Gas)
Elements Pure substances and samples of matter that has definite chemical and physical properties. (can’t be separated into simpler substances by physical or chemical means).
Compounds Pure substance composed of two or more different elements joined by chemical bonds.
Mixtures A combination of two or more pure substances that are not chemically combined. Each items retains its properties in the mixture. They can be separated physically.
Heterogeneous A mixture has larger parts that are different from each other.ex. pizza, salad
Homogenous A mixture contains 2 or more substances that are evenly mixed on a molecular level but still are not bonded together. (Solvent and Solute.
Physical Properties Properties that have to do with appearance. So you can usually observe them.
Chemical Properties Properties that deal with molecular and atomic structure. So they deal with how substances react with each other.
Physical Changes Does not change the composition of a substance, only the physical properties. Ex. when water freezes
Chemical Changes Resulting formation of one or more new substances with new chemical physical properties Ex. rust on a bike, combo of liquids to form a precipitate.
Periodic Table The periodic table is a chart created by scientist to help them organize and display the elements.
Metal Largest classification out of three. Usually shiny or metallic and are good conductor.
Non-Metals Classification out of three and are dull in appearance.
Metalloid Classification out of three. Characteristics of non-metals and metals. Located between metals and non-metals on the periodic table.
Luster a thin coating containing oxidized metal that glaze to ceramics.
Conductors Something that allows electricity to flow through it easily. Ex metals.
Malleable They can be bent and pounded into various shapes
Ductile meaning they can be drawn into wires without breaking
High Density Metals have high
Dull Not sharp
Non-Conductors Something that does not allow electricity to flow through it easily. Ex wood.
Brittle They cannot change shape without easily breaking.
Periods of the periodic table periods equal rows in the periodic table. There are 7 periods and each element in that row or period
Groups/Families of the periodic table Groups equal columns in the periodic table. There are 18 groups and each element in that group have similar structure and bonds
Atomic Number Number of protons in the nucleus of each atom that element.
Atomic mass/weight # of protons plus the number of neutrons.
Neutrons Negatively charged particles found in the nucleus.
Protons Positively charged particles found the in the nucleus.
Electrons Found outside the atom’s nucleus in the electron cloud. They have a negative charge. The part of the atom that is involved in chemical reactions
Chemical Formulas There are many some tell you about subscripts, #of neutrons, # of protons, and what elements are in the compound
Subscripts Written below and to the right of each element's symbol tells you how many atoms of that element exist in one unit of that compounds.
Chemical symbols Symbols that represent elements on the periodic table like N for nitrogen.
Chemical equations Used to represent that a chemical reaction has occurred It contains the chemical names/formulas of the substances that are involved in the reaction.
Reactant Starts the chemical reaction and are listed on the left side of the arrow, separated from each other by plus signs.
Product are placed on the right side of the arrow, also separated by plus signs
Law of Conservation of Matter French chemist who was also curious about matter. Especially when it changed forms. "matter is not created or destroyed it only changes form"
Created by: 00021335



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