Excess Reactant Worksheet
This worksheet focuses on understanding and calculating excess reactants in chemical reactions for Grade 10 Chemistry students.
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Excess Reactant Worksheet
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. In a chemical reaction, the reactant that is completely consumed and limits the amount of product formed is called the:
Excess reactant
Limiting reactant
Product
Reactant
2. If 5 moles of H₂ react with 2 moles of O₂ to form water (2H₂ + O₂ → 2H₂O), which is the excess reactant?
H₂
O₂
H₂O
Neither
3. The reactant that is left over after a chemical reaction has gone to completion is called the .
4. To determine the excess reactant, you first need to identify the .
5. Explain in your own words why it is important to identify the limiting and excess reactants in a chemical reaction.
6. The limiting reactant determines the theoretical yield of a product.
True
False
7. Consider the reaction: 2Na(s) + Cl₂(g) → 2NaCl(s). If you start with 46 g of sodium (Na) and 71 g of chlorine gas (Cl₂):
a) Determine the limiting reactant.
b) Determine the excess reactant.
c) Calculate the mass of the excess reactant remaining after the reaction is complete.
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