Student Exploration: Limiting Reactants
Keyaira Beck
Vocabulary: chemical equation, chemical formula, chemical reaction, coefficient, limiting reactant,
molecule, product, reactant, subscript
Prior Knowledge Question
...
Student Exploration: Limiting Reactants
Keyaira Beck
Vocabulary: chemical equation, chemical formula, chemical reaction, coefficient, limiting reactant,
molecule, product, reactant, subscript
Prior Knowledge Questions (Answer these questions BEFORE using the Gizmo.)
Imagine you and your friends are making hot dogs. A complete hot dog consists of a frankfurter and a
bun. At the store, you buy four packages of eight frankfurters and three bags of 10 buns.
1. How many hot dogs can you make? I can make 30 hotdogs.
2. Which ingredient limited the number of hot dogs you could make? Buns limited the number of
hot dogs I can make.
3. Which ingredient will you have leftovers of? I will have 2 leftover hotdogs.
Gizmo Warm-up
Just as ingredients can be put together to make new food items,
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 2.
A. A. How many hydrogen molecules (H2) are there? 1 Hydrogen atoms? 2
A. B. How many oxygen molecules (O2) are there? 1 Oxygen atoms? 2
2. How many H2O molecules do you think will form when these 4 molecules react? 2
3. Click Play (). How many H2O molecules actually formed? 2
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