Pre-Test Stoichiometry

The reactant that is completely used up in a reaction.

• Empirical Formula

• Molecular Formula

• Limiting Reagent

• Percent Yield

A process that calculates the amount of product that is made in a reaction if the amount of reactants is known.

• Chemistry

• Stoichiometry

• Limiting Reagent

• Percent Mass

The ability of a substance to dissolve.

• Solute

• Solvent

• Solubility

• Solution

A state of balance between the forward and reverse reactions.

• Equality

• Equilibrium

• Equity

The simplified formula for a compound.

• Empirical Formula

• Molecular Formula

• Limiting Reagent

• Percent Yield

The actual formula for a compound.

• Empirical Formula

• Molecular Formula

• Limiting Reagent

• Percent Yield

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2
• 4
• 6
• 8

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol
• 1.0 mol
• 10.1 mol
• 4.5 mol

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g
• 2.6 g
• 690 g
• 45 g