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28 Cards in this Set

  • Front
  • Back
Oxygen
O - 65% of total body mass
Carbon
C - 18.5% of total body mass
Hydrogen
H - 9.5% of total body mass
Nitrogen
N - 3.2% of total body mass
Calcuim
Ca - 1.5% of total body mass
Phosphorus
P - 1.0% of total body mass
Potassium
K - 0.35% of total body mass
Sulfur
S - 0.25% of total body mass
Sodium
Na - 0.2% of total body mass
Chlorine
Cl - 0.2% of total body mass
Magnesium
Mg - 0.1% of total body mass
Iron
Fe - 0.005% of total body mass
Trace elements
0.2% of total body mass
chemistry
the science of the structure and interactions of matter
matter
anything that occupies space and has mass
mass
the amount of matter in any object, which does not change
weight
the force of gravity acting on matter, does change
three states of matter
solid, liquid, gas
solids
compact and have a definite shape and volume
liquids
have a definite volume and assume the shape of their container
gases
have neither a definite shape nor volume
chemical elements
a limited number of building blocks, that make up all forms of matter - both living and nonliving
How many elements?
How many occur naturally on
Earth?
112 elements
92 occur naturally
chemical symbol
one or two letters of the element's namein English, Latin, or another language
How many elements are present in your body?
26 different elements
major elements
4--constitute about 96% of the body's mass: oxygen, carbon, hydrogen, and nitrogen
lesser elements
8--contribute 3.8% to the body's mass: calcium-C, phosphorus-P, potassium-K, sulfur-S, sodium-Na, chlorine-Cl, magnesium-Mg, and iron-Fe
trace elements
14--account for the remaining 0.2% of the body's mass; iodine