Limiting Reactants - Questions
The Limiting Reactants Concept Builder is comprised of 36 questions. The questions are organized into nine Question Groups and spread across three different activities. In the first activity,
The Perfect Match, students complete a table in which they relate a given quantity of a reactant and product (in moles) to the number of moles of the other species in the balanced chemical equation. There are six rows in the table and thus six situations to analyze. The calculations presume reactants are present in ratios that match the ratios of the coefficients in the balanced chemical equation. In the second activity,
Moles on ICE, students solve four problems in which they must determine the moles of reactant reacting and the moles of product being formed. The reactants are present in ratios that do not match the ratios fo the coefficients in the balanced chemical equation. Students must identify the limiting reactant and determine the moles of excess reactant remaining. The information is organized in an ICE Table. (I=Initial amount; C=Change in amount; E=Ending amount). The final activity,
Mass on ICE, is similar to the second activity with the exception that the analysis is done in terms of grams. The amount of mass initially present is a "kind number", typically a multiple or a simple fraction of the molar mass of the species. The exact questions are shown below.
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Limiting Reactants
Activity 1: The Perfect Match
Question Group 1
Question 1
Consider the reaction:
N2 + 3 H2 → 2 NH3
Complete the
Mole Table below assuming that the two reactants are available in amounts that match the ratios given by the coefficients of the balanced chemical equation. In other words, there are no left-over reactants.
Question 2
Consider the reaction:
N2 + 3 H2 → 2 NH3
Complete the
Mole Table below assuming that the two reactants are available in amounts that match the ratios given by the coefficients of the balanced chemical equation. In other words, there are no left-over reactants.
Question 3
Consider the reaction:
N2 + 3 H2 → 2 NH3
Complete the
Mole Table below assuming that the two reactants are available in amounts that match the ratios given by the coefficients of the balanced chemical equation. In other words, there are no left-over reactants.
Question 4
Consider the reaction:
N2 + 3 H2 → 2 NH3
Complete the
Mole Table below assuming that the two reactants are available in amounts that match the ratios given by the coefficients of the balanced chemical equation. In other words, there are no left-over reactants.
Activity 2: Moles on ICE
Question Group 2
Question 5

Consider the following reaction: N
2 + 3 H
2 → 2 NH
3
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 6

Consider the following reaction: N
2 + 3 H
2 → 2 NH
3
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 7

Consider the following reaction: N
2 + 3 H
2 → 2 NH
3
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 8

Consider the following reaction: N
2 + 3 H
2 → 2 NH
3
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question Group 3
Question 9
Consider the following reaction: 2 H
2 + O
2 → 2 H
2O
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 10

Consider the following reaction: 2 H
2 + O
2 → 2 H
2O
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 11

Consider the following reaction: 2 H
2 + O
2 → 2 H
2O
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 12

Consider the following reaction: 2 H
2 + O
2 → 2 H
2O
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question Group 4
Question 13

Consider the following reaction: 4 Na + O
2 → 2 Na
2O
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 14

Consider the following reaction: 4 Na + O
2 → 2 Na
2O
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 15

Consider the following reaction: 4 Na + O
2 → 2 Na
2O
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 16

Consider the following reaction: 4 Na + O
2 → 2 Na
2O
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question Group 5
Question 17

Consider the following reaction: 2 Ca + O
2 → 2 CaO
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 18

Consider the following reaction: 2 Ca + O
2 → 2 CaO
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 19

Consider the following reaction: 2 Ca + O
2 → 2 CaO
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Question 20

Consider the following reaction: 2 Ca + O
2 → 2 CaO
The
ICE Table shows the
Initial # of Moles of the two reactants and one product. Use coefficients to determine the
Change in the # of Moles and the
Ending # of Moles of the two reactants and one product.
Activity 3: Mass on ICE
Question Group 6
Question 21

Consider the following reaction: N
2 + 3 H
2 → 2 NH
3
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 22

Consider the following reaction: N
2 + 3 H
2 → 2 NH
3
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 23

Consider the following reaction: N
2 + 3 H
2 → 2 NH
3
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 24

Consider the following reaction: N
2 + 3 H
2 → 2 NH
3
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question Group 7
Question 25

Consider the following reaction: 2 H
2 + O
2 → 2 H
2O
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 26

Consider the following reaction: 2 H
2 + O
2 → 2 H
2O
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 27

Consider the following reaction: 2 H
2 + O
2 → 2 H
2O
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 28

Consider the following reaction: 2 H
2 + O
2 → 2 H
2O
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question Group 8
Question 29

Consider the following reaction: 4 Na + O
2 → 2 Na
2O
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 30

Consider the following reaction: 4 Na + O
2 → 2 Na
2O
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 31

Consider the following reaction: 4 Na + O
2 → 2 Na
2O
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 32

Consider the following reaction: 4 Na + O
2 → 2 Na
2O
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question Group 9
Question 33

Consider the following reaction: 2 Ca + O
2 → 2 CaO
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 34

Consider the following reaction: 2 Ca + O
2 → 2 CaO
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 35

Consider the following reaction: 2 Ca + O
2 → 2 CaO
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.
Question 36

Consider the following reaction: 2 Ca + O
2 → 2 CaO
The
ICE Table shows the
Initial mass (in grams) of two reactants and product. Determine the
Change in mass (in grams) and the
Ending mass (in grams) of reactants and product. Identify the limiting reactant.