Formulas for Ionic Compounds are Empirical Formulas

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Formulas for Ionic Compounds are Empirical
Formulas
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Big Ideas

• We can count by weighing (relative masses).
• Reactions occur by number of particles, we must
  deal with masses (mole concept).

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Hydrogen and Nitrogen React to Form Ammonia
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Question 1

• Which of the following reaction mixtures would
  produce the greatest amount of product according
  to the following chemical equation?
• 2H2 O2 ? 2H2O
• a) 2 mol H2 and 2 mol O2
• b) 2 mol H2 and 3 mol O2
• c) 2 mol H2 and 1 mol O2
• d) 3 mol H2 and 1 mol O2
• e) Each of the choices above would produce the
  same amount of product.

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Question 2

• Equal masses (in grams) of hydrogen gas and
  oxygen gas are reacted to form water. Which
  reactant is limiting?
• 2H2 O2 ? 2H2O
• a) Hydrogen
• b) Oxygen
• c) Neither

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More Big Ideas

• Atom (mass) conservation.
• Individual coefficients in a balanced equation
  are meaningless.