Atoms are the foundation
of our sensations.
They are incredibly small.
A single pebble from the
shoreline contains more
atoms than you could
The number of atoms in a
single pebble far exceeds
LO: Define matter, atoms, and molecules.
Matter - anything that
has mass (sometimes
expressed as weight)
and takes up space.
Different kinds of matter
are related to the
differences between the
Calculation of quantities of substances involved in a chemical
Based on the balanced chemical equation and the mass
and moles relationship.
LO: Restate and apply the law of constant
Joseph Proust (17541826) - elements combine in
fixed proportions to form compounds.
The law of constant compos
How much iron is in a
given amount of iron ore?
LO: Write Lewis structures for elements.
Lewis Structure or Dot Structure
Element symbol surrounded by dots
that represent the valence electrons
of an ato
Chemistry - the study of matter, its transformations, and the
energy changes that accompany those transformations.
Primary difference between a chemist and a biologist, physicist,
geologist, etc. - a chemist thinks o
LO: Express very large and very small numbers using
B is the base
n is the power or exponent
104 = 10 10 10 10 = 10,000
1 = 1 1 1
104 = 10
Two important modelsthe Bohr model and the
quantum-mechanical modelthat propose
explanations for the behavior of atoms.
Explain how electrons exist in atoms and how those
electrons affect the ch
When you drink from a straw, you remove some of
the molecules from inside the straw.
A pressure difference is created between the inside of
the straw and the outside of the straw
Even if t
Introduction to pH,
Measuring Acidity in
Aqueous Solution: pH
The concentrations of H+ or OH- in
solution can vary over a wide range.
scale can be easier to
The pH scale uses a number from 0 to
14 to indicate concentratio