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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
chemical bonding process that makes a new substance
cesium radioactive alkali metal
potassium alkali metal, reacts with water and air, in bananas
phosphorus nonmetal, in DNA and fertilizer, the white version ignites in air
Radium alkaline earth metal, radioactive, discovered by Marie Curie
Oxygen We need it to live, found in ozone gas
hydrogen lightest element
Mercury liquid metal, "mad hatter"
bromine toxic liquid that is a Halogen
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 # that tells how many atoms of an element
coefficient # that tells how many molecules of a formula
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
Created by: jhenretta