The Chemistry of Lifepg. 8 - 12

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, O2)

molecules that contain different atoms (eg. water, H2O or carbon dioxide, CO2)

Periodic table reviewWhy 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 Life6 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)

PracticeIn your textbook

◦pg. 9 #1-3◦pg. 12 #4-6