1.
atomic mass: average number of of nucleons in all isotopes of an element
2.
atomic mass unit (amu): mass of a nucleon, 1.67 x 10^-24
3.
atomic model: a concept of how the atom is structured
4.
atomic number: number of protons in nucleus, symbol Z, written as a subscript on lower left
5.
calorie (cal): heat required to raise the temperature of 1 gram of water by 1 degree Celsius
6.
chemical changes: formation of new substances with different properties and composition from the original material
7.
chemical equations: shorthand (abbreviated) method for describing chemical changes
8.
chemical properties: the ability of a substance to form new substances by reaction with other substances or by decomposition
9.
common names: names in everyday use other than standard chemical names
10.
conservation of energy: energy can be neither created nor destroyed, only changed
11.
conservation of mass: mass is neither created nor destroyed in a chemical change
12.
diatomic: existing as molecules with 2 atoms
13.
energy: the ability to do work
14.
heath: the kind of energy which can be sensed as temperature
15.
isotope: atoms with the same atomic number but different mass numbers (same Z, but different A)
16.
Joule (J): the official SI unit for heat or any kind of energy
17.
kilocalorie (kcal): 1000 calories; the "dietary calore" or "large calorie," abbreviated by Cal
18.
kilojoule (kJ): 1000 Joules
19.
kinetic energy (KE): energy of motion
20.
mass number: number of nucleons in the nucleus of an atom, symbol A, upper left superscript
21.
monatomic: existing as single atoms
22.
neutron: neutral particle, mass 1.67 x 10^-24 grams, no charge
23.
nucleon: particle in the nucleus, proton or neutron, mass 1.67 x 10*-24 grams
24.
nucleus: core of the atom
25.
physical changes: changes in physical properties with no change in composition
26.
physical properties: characteristics of a substance that can be determined without altering its compostion
27.
polyatomic: a molecule or group containing more than 2 atoms
28.
potential energy (PE): energy of elevation
29.
products: susbtances produced in a chemical equation
30.
proton: positive particle, mass 1.67 x 10^-24 grams, +1 charge
31.
reactants: starting substances in a chemical equation
32.
specific heat: the heat required to change the temperature of 1 gram of a substance 1 degree Celsius
