Human Body
Earth’s Crust
Why do you think the elements most common in the
human body are not the same as the elements most
common in the Earth’s crust?
Living and non-living
things have different
make-ups and need.
What are the rules for writing
chemical symbols?
0 The first letter in a symbol always
begins with a capital letter.
0 If the symbol is composed of two or
three letters, the second and third
letters are written in lower case.
0 Letters are always printed, not written
in cursive.
Be sure you know the 6 elements that
are found in all living things.
SPONCH
S
P
O
N
C
H
Sulfur
Phosphorus
Oxygen
Nitrogen
Carbon
Hydrogen
What is an element?
• An element is a pure substance
that cannot be broken down
into simpler substances. It
contains only one type of atom.
• The use of symbols on the
periodic table is to represent
the elements that make up all matter.
Copper = Cu
Iron
=
Fe
NaCl
Salt
=
Sodium Chloride
Why isn’t NaCl on the periodic table?
Compound – Any substance
made by chemically combining
2 or more elements.
Photosynthesis
Which of the substances involved in
photosynthesis are elements?
Which of the substances are compounds?
Which of the substances are molecules?
Cellular Respiration
Which of the substances involved in
Cellular respiration are elements?
Which of the substances are compounds?
Which of the substances are molecules?
How are the processes similar?
What are Organic Compounds?
An organic compound is made up
of carbon atoms bonded to atoms
of hydrogen, producing
hydrocarbons. (C-H) These
hydrocarbons are then bonded
with other elements. Examples
are carbohydrates, proteins,
lipids, and nucleic acids.
All organic compounds share similar
characteristics. The most obvious similarity is
that they all contain the "amazing element" carbon. Most also contain hydrogen and
oxygen as well. It is important to note that while
all organic compounds contain carbon, not all
carbon compounds are organic. Carbon dioxide
is a compound that contains carbon and oxygen.
However, carbon dioxide is not an organic
compound. It is an inorganic compound.
Organic
or
Inorganic?
Riboflavin
C17H20N4O6
Organic
Nitric Acid
HNO3
Inorganic