Advanced Stoichiometry
The Advanced Stoichiometry STEM Certificate is a self-guided program that reinforces the topics of stoichiometry with students, including: dimensional analysis, conversion factors, chemical formulas, Avogadro's number, Avogadro's Law, the mole, molar ratios, molar mass, molarity, limiting and excess reactants and percent yield. Through this series, students will learn strategies for setting up chemistry story problems and view example calculations.
Watch all ten videos and complete each quiz to earn your certificate.
Links to help with video quizzes:
- Interactive Periodic Table (The Royal Society of Chemistry)
- Desmos: Free Online Scientific Calculator
Video 1: Dimensional Analysis Basics
The phrase ‘dimensional analysis’ quite literally means that if you use the correct units, you can figure out whether you have your conversions set up properly. Conversions don’t change what is being measured. Instead, conversions provide a way to express values in different terms. This is useful in science because it allows us to take measurements using available laboratory equipment. We can then apply conversions to our lab measurements in order to calculate values in terms of the units we need to find.
After watching this video, CLICK HERE FOR QUIZ 1.
Video 2: Chemical Formulas as Conversion Factors
We use conversion factors often in our daily lives to make sense of the world around us. We know that 24 hours is equivalent to one day, and 1 inch is equivalent to 2.54 centimeters. Using any given chemical formula, we can create a variety of conversion factors to help us convert between the chemical formula and the different atoms that make up that formula.
After watching this video, CLICK HERE FOR QUIZ 2.
Video 3: Avogadro's Number
We have many words that indicate a particular number: dozen, pair, score, gross, baker’s dozen. In chemistry, we have the word ‘mole’ which is represented by Avogadro’s number. For learners new to chemistry, Avogadro’s number can seem overwhelming and challenging to use in calculations. It’s important to remember that even though the number seems complicated, it helps us convert amounts into moles which make other calculations more manageable.
After watching this video, CLICK HERE FOR QUIZ 3.
Video 4: The Mole is the Middleman
The 'mole' is a fundamental SI unit in chemistry. Converting values into moles gives us a way to make sure we have the correct number of atoms without having to actually count every single atom.
After watching this video, CLICK HERE FOR QUIZ 4.
Video 5: Gram to Mole Conversions
Using an element’s average atomic mass from the periodic table, we can calculate molar mass for any chemical formula by setting the calculated mass equal to one mole. In this video, multiple examples of these types of calculations are provided.
After watching this video, CLICK HERE FOR QUIZ 5.
Video 6: Volume to Mole Conversions Using Avogadro's Law
Amedeo Avogadro is known for his number, “Avogadro's number,” 6.022 x 1023. However, Avogadro didn't actually know his number. It was discovered after his death. Avogadro theorized that if there are equal volumes of any gas, that volume would include the same number of “pieces” of any gas particle. From there, Avogadro's Law was developed and is used in Stoichiometry to convert between chemical species.
After watching this video, CLICK HERE FOR QUIZ 6.
Video 7: Volume to Mole Conversions for Solutions Using Molarity
Molarity is a unit used to express concentration in solution chemistry. Because ‘molarity’ is equivalent to moles divided by liters, it is a useful unit to use in conversions related to stoichiometry. In this video, students are reminded to use all given values and provided with helpful strategies when setting up problems related to solution chemistry.
After watching this video, CLICK HERE FOR QUIZ 7.
Video 8: Mole to Mole Conversions Using Stoichiometry
The stoichiometry step refers to the conversion between two chemicals in a reaction. Using coefficients from a balanced chemical reaction, any two coefficients can form a ratio, which is referred to as a molar ratio.
After watching this video, CLICK HERE FOR QUIZ 8.
Video 9: Limiting & Excess Reactants
In a chemical reaction, one of the reactants will get used up and cause the reaction to stop. The reactant that gets used up first is known as the ‘limiting reactant.’ Example calculations for determining limiting and excess reactants are demonstrated in this video.
After watching this video, CLICK HERE FOR QUIZ 9.
Video 10: Percent Yield
Because of the Law of Conservation of Mass, a chemical reaction will never produce more than 100% yield. Percent yield is a measure of ‘actual (expected) yield’ divided by ‘theoretical yield’ and multiplied by 100. Example calculations for determining percent yield are demonstrated in this video.
After watching this video, CLICK HERE FOR QUIZ 10.
After you watch all 10 videos and take the quizzes, CLICK HERE for the Advanced Stoichiometry Certificate.
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