The Chemistry of Life pg. 8 - 12. Why is the study of cells so important? Effects of medicine Diverse Careers Benefits of Foods Ethical testing Improved.

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Presentation transcript:

The Chemistry of Life pg

Why is the study of cells so important? Effects of medicine Diverse Careers Benefits of Foods Ethical testing Improved Performance

Atoms Hopefully you remember this guy... Atoms are the smallest unit of matter

Elements, molecules & compounds What is the difference between... ◦ Elements - ◦ Molecules - ◦ Compounds - a pure substance containing 1 atom (eg. hydrogen, H) a combination of 2 or more atoms (eg. oxygen, O 2 ) molecules that contain different atoms (eg. water, H 2 O or carbon dioxide, CO 2 )

Periodic table review Why does the periodic table look the way it does? The middle section of transition metals fits here. It is NOT important for our biology lesson.

Hydrogen Atomic number ___ # protons ___ # neutrons___ # e - Bohr diagrams Lithium Atomic number ___ # protons ___ # neutrons___ # e -

Try drawing these... Carbon ◦ symbol ‘C’ Sodium ◦ symbol ‘Na’

The Chemistry of Life 6 elements make up 99% of ALL living organisms: ◦ C, H, O, N, P and S Atoms are held together by chemical bonds

Covalent vs ionic bonding

Ions... An ion is an atom with a + or - charge + charge means some e - have been lost - charge means some e - have been gained eg. table salt (NaCl)

Practice In your textbook ◦ pg. 9 #1-3 ◦ pg. 12 #4-6

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