LESSON 1 Flashcards
is based on the idea that matter is composed of tiny particles that are always in motion.
The kinetic-molecular theory
Solids, liquids, and gases are made of tiny particles called ____ and ____
atoms and molecules
its the basic unit of a chemical element
atom
It is composed of two or more atoms connected chemically.
molecule
matter is made of particles that are constantly in motion. This energy in motion is called
kinetic energy
The amount of kinetic energy in a substance is related to its temperature. Increased temperature ____
greater speed
Heating a substance makes its atoms and molecules move faster.
temperature
There are attractive forces in between particles called
intermolecular forces.
are intermolecular forces of attraction between all atoms and molecules.
London dispersion forces, or simply dispersion forces,
are weak attractive forces that result from the continuous
Dispersion forces
are attractive forces between polar molecules, that is, between molecules that possess dipole moments.
dipole-dipole forces
A simplified model to represent only the valence or outer electrons of an atom.
Lewis Structure
are attractive forces between polar molecules, that is, between molecules that possess dipole moments.
Dipole-dipole forces
dictates that atoms are most stable when their valence shells are filled with eight electrons.
octet rule
an atom is considered “happy” when its
outer electron shell is filled.
