chapter 1
what is matter
anything that has mass and occupies space
three states of matter
solid, liquid, gas
Most metric units are based on multiples of what?
10
first theory to relate to chemical changes to events at the atomic level
Daltons atomic theory
proposed that an electron is found only in specific circular paths, or orbitals, around the nucleus
Bohr
what tiny particles are elements made from?
atoms
most samples of atoms are?
mixtures
What is a measurement?
quantity that has both a number and a unit
whats an electron?
Negatively charged subatomic particles
the ways in which a electrons are arranged in various orbits around the nuclei of atoms
electron configuration
whats an observation
info obtained through senses
physical changes are classified as?
reversible or irreversible
what does the king stand for in the metric conversion?
kilo
whats a proton?
positively charged subatomic particles
the amount of energy required to move an electron from one energy level to another
quantum
The steps for solving a numeric problem are?
analyze, calculate, and evaluate
whats a group?
each vertical column of the periodic table
what does Henry stand for in the metric conversion?
hectogram
whats a neutron?
subatomic particles with no charge
fixed energies an electron can have
energy levels
what is required for materials to burn?
oxygen
whats a reactant?
a substance present at the start of reaction
what does the chocolate stand for in the metric conversion?
centimeter
what is 1/12 of the mass of a carbon-12 atom
atomic mass unit
atomic number is the number of what?
protons