Chapter 6 Chemical Reactions

1
Ira Remsen Demonstration Diagram
2
Equation for the reaction

• Cu(s) HNO3(aq) ? NO2(g)
  H2O(l) Cu(NO3)2(aq)
• reactants ? products

Copper nitric acid produces
nitrogen water copper(II)nitrate
dioxide
things on the left ? things on the right
3
State symbols

• s solid
• l liquid
• g gas
• aq aqueous (dissolved in water)

4
Energy changes

• Because heat is released in this reaction it is
  called an exothermic reaction.

5
Why does the penny have to be old?

• Pre-1982 pennies are mostly copper.
• Post-1982 pennies are made up of a zinc core
  surrounded by a thin layer of copper.

6
Chemistry of Color

• The NO2 gas produced is brownALL COLORED GASES
  ARE POISONOUS.
• Copper ions tend to produce blue solutions.