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Chemistry

Chemstry for middle school

TermDefinition
electron cloud area around the nucleus where electrons are found
valence electrons electrons on the outer level of an atom
atom building blocks of matter
atom smallest part of an element
matter made up of atoms
subatomic particles protons, neutrons and electrons
subatomic particles particles that are smaller than an atom
protons postiviely charged particles in the nucleus
neutrons neutral particles in the nucleus
electrons negatively charged particles in the nucleus
element simplest substance made up of only one type of atom
compound made up of 2 or more elements
molecule groups of atoms bonded together
hydrogen lightest element
Physical change a change in properties that is reversible
Chemical change a non reversible change in which a new substance is made
atomic number number of protons in an atom
chemical formula shortcut way to write a molecule using subscripts and coefficients
subscripts Small number that comes after a symbol that tells how many atoms of an element
coefficient large number in front of a chemical formula that tells how many molecules
exothermic reaction that gives off heat
endothermic reaction that absorbs heat (feels cold)
chemical reaction atoms rearrance to make a new substance
chemical equation using formulas to show what happens in a chemical reaction
Law of conservation of matter no atoms/matter are created or destroyed in a chemical reaction. Atoms are rearranged.
Law of conservation of matter mass of reactants = mass of products
reactants chemicals on the left side of an equation that are mixed together
products chemicals on the right side of an equation that are made in a reaction
electron shell Orbits or paths where electrons travel around the nucleus
electron level (same thing) electron shell (same thing)
Created by: jhenretta
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