The Chemistry of Life

Chapter 2

C H O + 6O CO + H O6 212 2 26

What do you know about this chemical equation?What are the parts?What do the numbers mean?

Chemicals in the Human Body

What makes up matter?

ATOM – the basic unit of matterSUBATOMIC PARTICLES –protons (+) & in nucleuselectrons (-)neutrons: in nucleus

Atoms have an equal number of protons and electrons

• Element – pure substance with only one type of atom

• Isotopes – atom of the same element with a different number of neutrons

• Compound – substance formed of two or more elements