chem 101! exam 1

elements

pure substances that can’t be separated into smaller substances

compounds

a pure substance composed of 2 or more elements that’re chemically bonded in a fixed proportion

atoms

tiny building block

molecules

a collection of chemically bonded atoms

physical change

transformation of a sample of matter that doesn’t alter its chemical identity

chemical change

transformation of one or more atoms or molecules into one or more different molecules

Which elements are diatomic?

Nitrogen, Hydrogen, Fluorine, Oxygen, Iodine, Chlorine, Bromine

kinetic energy

energy of motion

potential energy

energy by virtue of position or composition

law of conservation of energy

states that energy cannot be created or destroyed, but it can be converted from one form to another

what’s the relationship between energy and stability

more negative energy = more stable

sublimation

solid to gas

melting

solid to liquid

vaporization

liquid to gas

condensation

gas to liquid

freezing

liquid to solid

deposition

gas to solid

extensive property

property that changes if extra stuff is added

intensive property

property that is independent of the amount of matter