Name: Ryanna Warner
Student Exploration: Limiting Reactants .
Vocabulary: chemical equation, chemical formula, chemical reaction, coefficient, limiting
reactant, molecule, product, reactant, subscript
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
Imagine you and your friends are making hot dogs. A complete hot dog consists of a wiener and
a bun. At the store, you buy four packages of eight wieners and three bags of 10 buns.
1. How many total hot dogs can you make? You can make 30 hot dogs
2. Which ingredient limited the number of hot dogs you could make? The buns were the
limiting factor
3. Which ingredient will you have leftovers of? There will be 2 excess hotdogs
Gizmo Warm-up
Just as ingredients can be put together to make a new food,
substances can combine during a chemical reaction to produce
new substances. The substances that undergo change are
called reactants. The new substances are products.
Sometimes during a chemical reaction, one type of reactant will
be used up before the other reactants. This reactant is the
limiting reactant. Using the Limiting Reactants Gizmo™, you
can determine which reactant is limiting in various scenarios.
To begin, make sure H2 + O2 becomes H2O is selected. The small “2” in H2, O2, and H2O is a
subscript. Subscripts represent the number of atoms in a molecule.
1. Use the sliders to set the number of O2 molecules and H2 molecules to two.
A. How many hydrogen molecules (H2) are there? 2 Hydrogen atoms? 4
B. How many oxygen molecules (O2) are there? 2 Oxygen atoms? 4
2. How many H2O molecules do you think will form when these four molecules react? 2
3. Click Play ( ). How many H2O molecules actually formed? 2
This study source was downloaded by 100000842568006 from CourseHero.com on 05-26-2022 14:14:32 GMT -05:00
https://www.coursehero.com/file/50403985/LimitingReactantsGizmoFINISHEDdocx/
, Get the Gizmo ready:
Activity A:
Make sure H2 + O2 becomes H2O is selected.
Water reaction
Click Reset ( ).
Goal: Identify a limiting reactant.
1. Count: H2O is the chemical formula for water. In order to produce a single molecule of
water, how many hydrogen atoms are needed? 2 Oxygen atoms? 1
2. Predict: Set the number of O2 molecules to five and the number of H2 molecules to eight.
A. How many oxygen atoms are present? 10 Hydrogen atoms? 16
B. How many water molecules could form from these reactants? 8
C. After the molecules react, which reactant will be left over? Oxygen O2
D. Which reactant will be the limiting reactant? Hydrogen H2
E. Click Play and wait until Reaction complete is shown. What happened?
All but one oxygen molecule bonded with hydrogen
3. Test: Click Reset. Set the number of O2 molecules to 10.
A. How many hydrogen molecules (H2) will be needed for there to be no excess
reactants? 20 Use the slider to set the number of H2 molecules to this value.
B. How many water molecules will be formed? 10
C. Click Play. What happened? 10 water molecules were formed and there were no
excess oxygen or hydrogen molecules leftover when the reaction was complete
4. Challenge yourself: Run the Gizmo with five O2 molecules and nine H2 molecules.
A. How many of each molecule do you think will be produced by this reaction?
O2: 1 H2: 1 H2O: 8
B. Click Play. How many were actually produced? O2:1 H2:1 H2O:8
This study source was downloaded by 100000842568006 from CourseHero.com on 05-26-2022 14:14:32 GMT -05:00
https://www.coursehero.com/file/50403985/LimitingReactantsGizmoFINISHEDdocx/
Student Exploration: Limiting Reactants .
Vocabulary: chemical equation, chemical formula, chemical reaction, coefficient, limiting
reactant, molecule, product, reactant, subscript
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
Imagine you and your friends are making hot dogs. A complete hot dog consists of a wiener and
a bun. At the store, you buy four packages of eight wieners and three bags of 10 buns.
1. How many total hot dogs can you make? You can make 30 hot dogs
2. Which ingredient limited the number of hot dogs you could make? The buns were the
limiting factor
3. Which ingredient will you have leftovers of? There will be 2 excess hotdogs
Gizmo Warm-up
Just as ingredients can be put together to make a new food,
substances can combine during a chemical reaction to produce
new substances. The substances that undergo change are
called reactants. The new substances are products.
Sometimes during a chemical reaction, one type of reactant will
be used up before the other reactants. This reactant is the
limiting reactant. Using the Limiting Reactants Gizmo™, you
can determine which reactant is limiting in various scenarios.
To begin, make sure H2 + O2 becomes H2O is selected. The small “2” in H2, O2, and H2O is a
subscript. Subscripts represent the number of atoms in a molecule.
1. Use the sliders to set the number of O2 molecules and H2 molecules to two.
A. How many hydrogen molecules (H2) are there? 2 Hydrogen atoms? 4
B. How many oxygen molecules (O2) are there? 2 Oxygen atoms? 4
2. How many H2O molecules do you think will form when these four molecules react? 2
3. Click Play ( ). How many H2O molecules actually formed? 2
This study source was downloaded by 100000842568006 from CourseHero.com on 05-26-2022 14:14:32 GMT -05:00
https://www.coursehero.com/file/50403985/LimitingReactantsGizmoFINISHEDdocx/
, Get the Gizmo ready:
Activity A:
Make sure H2 + O2 becomes H2O is selected.
Water reaction
Click Reset ( ).
Goal: Identify a limiting reactant.
1. Count: H2O is the chemical formula for water. In order to produce a single molecule of
water, how many hydrogen atoms are needed? 2 Oxygen atoms? 1
2. Predict: Set the number of O2 molecules to five and the number of H2 molecules to eight.
A. How many oxygen atoms are present? 10 Hydrogen atoms? 16
B. How many water molecules could form from these reactants? 8
C. After the molecules react, which reactant will be left over? Oxygen O2
D. Which reactant will be the limiting reactant? Hydrogen H2
E. Click Play and wait until Reaction complete is shown. What happened?
All but one oxygen molecule bonded with hydrogen
3. Test: Click Reset. Set the number of O2 molecules to 10.
A. How many hydrogen molecules (H2) will be needed for there to be no excess
reactants? 20 Use the slider to set the number of H2 molecules to this value.
B. How many water molecules will be formed? 10
C. Click Play. What happened? 10 water molecules were formed and there were no
excess oxygen or hydrogen molecules leftover when the reaction was complete
4. Challenge yourself: Run the Gizmo with five O2 molecules and nine H2 molecules.
A. How many of each molecule do you think will be produced by this reaction?
O2: 1 H2: 1 H2O: 8
B. Click Play. How many were actually produced? O2:1 H2:1 H2O:8
This study source was downloaded by 100000842568006 from CourseHero.com on 05-26-2022 14:14:32 GMT -05:00
https://www.coursehero.com/file/50403985/LimitingReactantsGizmoFINISHEDdocx/
