Life Science Flashcards Unit 2
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PRESENTATION OUTLINE
Matter
Anything that takes up space and has mass.
All matter is made of mass.
All matter is made of mass.
Photo by NASA's Marshall Space Flight Center
Element
Each element is made of only one kind of atom.
There are 120 elements.
Examples: gold, carbon, oxygen, hydrogen, iron...
There are 120 elements.
Examples: gold, carbon, oxygen, hydrogen, iron...
Photo by denn
Periodic table
A list of all of the chemical elements that exist in the universe.
It categorizes elements according to the prorprties of their atoms.
It categorizes elements according to the prorprties of their atoms.
Photo by Rick Liebling
Molecule
Formed when two or more atoms join together.
These may be 2 of the same atom or 2 different atoms.
These may be 2 of the same atom or 2 different atoms.
Photo by p_a_h
Compound
Formed when 2 or more DIFFERENT atoms are joined together.
Note: All compounds are also molecules, but not all molecules are compounds.
Examples of Compounds: CO2 NaCl H2O2
Non Examples - Not compounds: O2 H2
Note: All compounds are also molecules, but not all molecules are compounds.
Examples of Compounds: CO2 NaCl H2O2
Non Examples - Not compounds: O2 H2
Photo by yonolatengo
Subscripts
tell you how many “atoms” of each element for that molecule
Example: H2 = 2 atoms hydrogen
Examples: H2O = 2 atoms hydrogen, 1 atom oxygen
Example: H2 = 2 atoms hydrogen
Examples: H2O = 2 atoms hydrogen, 1 atom oxygen
Coefficients
multiply the number of molecules you are making!
2 H2O = 4 atoms hydrogen, 2 atoms oxygen
2 H2O = 4 atoms hydrogen, 2 atoms oxygen
