Transcript Section 4.1 - CPO Science

Organisms and the
Environment
Chapter Four: Physical Science
Connections
• 4.1 Elements and Compounds
• 4.2 The Compounds of Life
• 4.3 Physical Variables
4.1 Elements and Compounds
• In the 1950s, American
scientist Stanley Miller
tried to find a recipe for
life.
• While Miller did not find
a recipe for making life,
he DID make amino
acids, building block
molecules of cells.
4.1 Elements and compounds
• The ingredients for life
are simple.
• Your body is mostly
three elements:
carbon, oxygen, and
hydrogen.
• An element is the
The top three elements are
simplest form of
what total percent of the body?
matter.
4.1 Atoms, compounds and
molecules
• A single atom is the
smallest particle of an
element that keeps the
chemical identity of the
element.
• Each element has a
unique type of atom.
4.1 Atoms, compounds and
molecules
• A compound is a
substance that
contains two or
more different
elements that are
chemically joined.
4.1 Atoms, compounds and
molecules
• A molecule is a
group of two or
more atoms joined
together chemically.
4.1 Atoms, compounds and
molecules
• Many substances
you encounter are a
mixture of different
elements and
compounds.
How
are
Howmany
manyatoms
molecules
inare
this
in mixture?
this mixture?
4.1 Chemical reactions
• A chemical reaction is a process that
rearranges the atoms of one or more
substances into one or more new
substances.
4.1 Importance of water
• Liquid water is
used to transport
molecules where
they need to go,
inside and outside
of cells.
Review: What is a solution?
4.1 The importance of water
•
Water’s properties
make it a valuable
substance for life.
1. It is a good solvent.
2. It has a wide range
of temperatures.
3. It has a high
specific heat.
This water is boiling at
the bottom of the ocean!