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Intro to Chemistry

Vocabulary words

TermDefinition
Atom The smallest unit of matter. This cannot be divided any smaller.
Proton Particles with a positive charge.
Electron Particles with a negative charge.
Neutron Particles do NOT have a charge
Element A substance that is made up of one kind of atom
Molecule Is made up of 2 or more atoms held together by binds. Example, CO2, NaCl, O2, H2
Periodic Table of Elements A chart showing all the known elements on Earth; these are arranged in groups that share certain characteristics
Atomic Number Tells the number of protons in an atom. It can be used to determine the number of electrons.
Atomic Mass Total mass of an atom includes protons, electrons & neutrons.
Chemical Properties Can be observed when an element is chemically changed. Ex: flammability, how easily it rusts
Physical Properties Can be observed or measured without changing the element. Ex: color, mass, density
Compound Made up of two or more elements that are chemically combined. Examples: CO2 or glucose
Mixtures Contains 2 or more substances that are physically combined.
Bond Something that connects or joins atoms together- happens through interactions of electrons
Chemical Formula A combination of elements and how many elements there are. For example CO2 has one carbon and 2 oxygen.
Chemical Equations Shows the starting reactants and end products. Example: H2O+CO2+sunlight----> C6H12O6+O2
Chemical Reactions A process that changes, or transforms one set of chemicals into another set of chemicals.
Reactants The "ingredients" necessary for a chemical reaction
Products What is created or produced after a chemical reaction
Law of Conservation of Mass Mass can NOT be created or destroyed
Created by: lmk17