The Chemistry of Life
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What are the two types of reactions that can
occur when atoms bond together?
Endothermic and Exothermic
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What one occurs when atoms bond
TOGETHER? If we could detect temperature,
what would it feel like?
Endothermic – it might feel cold.
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Rub a balloon to create a static charge.
Gently run water out of the faucet.
Hold the balloon next to the stream of
water without touching it! (dry with paper
towel if needed)
Make the water dance 
Sit with your table and discuss how that
happens. Jot down your ideas…
Atoms join with other atoms to form
stable substances.
 Atoms want to have a full outer orbital
to become stable.
 It involves just the
valence electrons
of an atom.
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“I ATE “8” UNTIL I WAS FULL!”
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Occurs between a
Nonmetal & Nonmetal
BOTH ELEMENTS ON THE LEFT
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Sharing of electrons
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Ex: CO2, H2O, O2,CH4
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Occurs between a
Metal & Nonmetal
ONE OF THE LEFT AND ONE ON THE RIGHT
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Loss of Electrons
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Metal gives e- to nonmetal
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Ex: NaCl (salt)
◦ Chlorine takes e◦ Sodium gives e-
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Working with a partner, you will make models
of covalent and ionic bonds.
Follow all of the directions!