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matter anything that has mass and volume
atoms smallest unit of an element
proton particle with a positive charge in the nucleus
neutron particle in the nucleus with no electric charge
electron tiny particle with a negative charge found outside of the nucleus
nucleus center of the atom
parts in the nucleus proton and neutrons
electron cloud area surrounding the nucleus also known as orbitals or energy levels
energy level one can hold up to 2 electrons
energy level two can hold up to 8 electrons
energy level three can hold up to 18 electrons
element substance that cannot be broken down into any other substance
periodic table of elements resource for information about all of the elements
atomic number smaller number on the periodic table the indicates the number of protons or electrons
atomic mass larger number on the periodic table that is the total number of protons and nuetrons
chemical symbol letters on the periodic table
subtract how to find the number of neutrons in an atom
abundant elements those that are found in large amounts on Earth
abundant elements in the atmosphere Nitrogen and Oxygen
abundant elements in the oceans Oxygen Hydrogen Sodium and Chlorine
abundant elements in Earth's crust (the ground) Oxygen and Silicon
abundant elements in the human body Oxygen Carbon and Hydrogen
element found in all living things Carbon
element that is abundant in air, oceans, earth's crust, and the body Oxygen
compound a substance made of two or more elements that combine chemically
molecule a group of two or more atoms held together by chemical bonds
chemical formula used to represent a compound; shows the elements that are in the compound
chemical change a change in matter that produces one or more new substances
chemical equation a way to show a chemical reaction using symbols
reactants found on the left side of the equation; substances that undergo a chemical change
arrow separates the reactants from the products in a chemical equation
products found on the right side of the equation; new substances that are formed during a chemical reaction
examples of chemical changes burning, rusting, tarnishing, photosynthesis, acid neutralization
photosynthesis plants change sunlight and carbon dioxide into Oxygen and glucose (food)
rust or tarnish the product of a chemical change that occurs when metals are exposed to air and water
acid/base neutralization chemical change that occurs when the pH of a liquid changes
example of a liquid with a neutral pH (7) water
exothermic reaction releases heat
endothermic absorbs heat making the surrounding colder
physical change any change that alters the appearance of a substance but does not change it into a new substance
Created by: sford