Excess Reactant Chemistry Worksheet
A Grade 9 Science worksheet focusing on understanding and calculating excess reactants in chemical reactions.
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Excess Reactant Chemistry Worksheet
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Read each question carefully and answer to the best of your ability. Show all your work for calculation problems.
1. What is the definition of an excess reactant?
The reactant that is completely consumed in a chemical reaction.
The reactant that is left over after the reaction has stopped.
The product formed in the largest quantity.
The reactant with the highest molar mass.
2. In a reaction where 5 moles of H₂ react with 2 moles of O₂ to produce H₂O, which is the limiting reactant?
H₂
O₂
H₂O
Neither, both are completely consumed.
1. The reactant that is completely used up in a chemical reaction is called the reactant.
2. The reactant that remains after a chemical reaction has stopped is known as the reactant.
3. To determine the excess reactant, you first need to identify the reactant.
1. Explain the importance of identifying the excess reactant in a chemical reaction.
Consider the reaction: 2Na + Cl₂ → 2NaCl
If you start with 4.6 g of Na and 7.1 g of Cl₂:
a) Determine the limiting reactant. Show your work.
b) Determine the excess reactant. Show your work.
c) Calculate the mass of the excess reactant remaining after the reaction.
1. The limiting reactant determines the amount of product formed.
True
False