Pure substance composed of molecules with identical combinations of atoms
Measurement of how acidic (1-6.9), neutral (7), or basic (7.9-14) a substance is based on its concentration of hydrogen ions
Element that is lustrous, conducts electricity & heat well, & is malleable & dense
Phase change from gas to liquid
The amount of matter in a substance, measured with a scale or balance
Greek God of light, medicine, art, & archery
Vertebrate whose life cycle includes an aquatic stage (frogs & salamanders)
In Greek mythology, God of the sea
State of matter with the most kinetic energy (heat)
Group 2 on the periodic table; reactive metals
Group 17 on the periodic table; very reactive nonmetals--such as fluorine & chlorine
Element that has a low melting point, boiling point, density, & poor thermal conductivity & electrical conductivity
Measure of how close the atoms or molecules of a substance are--mass divided by volume
Electrons on the outside (highest energy) level of the atom
Phase change from solid directly to gas without passing through the liquid phase
Amount of space something takes up, measured with a graduated cylinder
Asian ape with orange hair native to Borneo & Sumatra
State of matter in which the atoms or molecules are closely packed together & cannot move freely, & which has definite shape & volume
Horizontal row on the periodic table; contains elements with the same number of energy levels