Atoms and Molecules
contains protons and neutrons
What is the nucleus of the atom?
the total number of protons and neutrons in an atom
What is the atomic mass number?
a change in which a new substance is formed
What is a chemical change?
states that energy cannot be created or destroyed
What is the Law of Conservation of Energy?
A reaction that takes in energy
What is an endothermic reaction?
an atom with an electrical charge
What is an ion?
the total number of protons in an atom
What is the atomic number?
a reaction which requires oxygen
What is combustion?
states that the proportion of elements in any compound is always the same
What is the Law of Definite Proportions?
a reaction that gives off energy
What is an exothermic reaction?
holds a molecule together by sharing electrons
What is a covalent bond?
the the family of elements located at the right end of the periodic table
What are the Noble Gasses?
the atoms present before a chemical reaction
What are reactants?
states that the product of a gasses volume and pressure are always the same
What is Boyles Law?
states that energy cannot be created or destroyed, it can only change forms
What is the first law of Thermodynamics?
a compound with at least 1 metal atom and 1 nonmetal atom
What is an ionic compound?
the outermost electrons in an atom
What is a valence electron?
the atoms and molecules present after a chemical reaction
What are products?
What is Charles' Law?
the measurement of energy
What is a joule?
an atom with the same number of protons, but a different number of neutrons
What is an isotope?
the lowest possible energy state for an electron
What is the ground state?
the number you add to an atom or molecule to balance an equation
What is a coefficient?
states that matter cannot be created or destroyed, it can only change in form
What is the Law of the Conservation of Mass?
the amount of heat necessary to warm 1 gram of water, 1 degree
Wat is a calorie?