Professor Dave Explains
IIT/JEE Chemistry Practice #3: Empirical/Molecular Formula
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
Professor Dave Explains
IIT/JEE Chemistry Practice #7: Molality/Mole Fraction
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
Professor Dave Explains
IIT/JEE Chemistry Practice #24: Molar Mass of a Gas
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
Professor Dave Explains
IIT/JEE Chemistry Practice #11: Moles/Molarity
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
Professor Dave Explains
Elemental Analysis: Empirical and Molecular Formulas
There's a thing with carbon and hydrogen in it. But how many of each?! That's the kind of thing a chemist should know. So let's do some elemental analysis!
Professor Dave Explains
Practice Problem: Limiting Reagent and Percent Yield
Once we get the hang of stoichiometric calculations, we get a curve ball. Limiting reagents? Not all of the reactants will react? We might not get as much product as we expect? Let's practice identifying the limiting reagent, calculating...
Professor Dave Explains
Practice Problem: Conversions Using Avogadro's Number
The concept of the mole is a little tricky when you first learn about, but soon you're converting between grams and moles and atoms with ease. Let's practice some conversions using Avogadro's Number now!
Professor Dave Explains
IIT/JEE Chemistry Practice #21: Properties of Gases
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
Professor Dave Explains
IIT/JEE Chemistry Practice #2: Molar Mass/Stoichiometry
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
Professor Dave Explains
IIT/JEE Chemistry Practice #10: Gas Stoichiometry
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
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Chemistry Skills: Units
Did you know that (at least) one mark in the HSC Chemistry exam comes from using the correct units? If you know your SI units well, then you’re guaranteed a free mark! If only the rest of the exam was that easy! This lesson will cover...
Professor Dave Explains
Practice Problem: Density of a Gas
If we can use the ideal gas law to find the molar mass of a gas and therefore identify the gas, what can we do with the density of a gas? Well, pretty much the same thing, it just involves one extra calculation, so let's give it a try!
Professor Dave Explains
IIT/JEE Chemistry Practice #8: Molecular Formulas
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
Professor Dave Explains
IIT/JEE Chemistry Practice #23: Graham's Law of Effusion
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Professor Dave Explains
IIT/JEE Chemistry Practice #1: Avogadro's Number/Moles
Practice REAL problems from actual past IIT/JEE exams with Professor Dave!
Professor Dave Explains
Practice Problem: Molar Mass of a Gas
We know about the ideal gas law, but what are some clever things we can do with it? Well, how about identifying an unknown gas by solving for its molar mass? Sure, why not!
Professor Dave Explains
Practice Problem: Gravimetric Analysis
What the heck is gravimetric analysis? Well let's say we want to know how much of a substance is in some mixture. We could toss it in solution and cause it to form a precipitate with some other ion in solution. We can measure the mass of...
Professor Dave Explains
Practice Problem: Graham's Law of Effusion
We know that molecules will travel at an average velocity that is inversely proportional to their molar mass. This means that lighter gases travel faster. We can relate the rates of effusion for two gases using Graham's law, and we can...
Professor Dave Explains
Practice Problem: Empirical and Molecular Formulas
How do we know how many atoms of each element are in a particular compound? Through clever experiments! Here let's practice using percent mass information to get the empirical and molecular formulas of a particular compound.
Professor Dave Explains
Practice Problem: Molarity Calculations
Solution concentration is measured in molarity, which is moles solute per liter of solution. Can we calculate concentration, moles, or volume, given the other two values? Sure, it's easy!
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In Depth: Atomic Mass Units
Learn the basics about Atomic Mass Units. The atomic mass is used to find the average mass of elements and molecules and to solve stoichiometry problems. Find out more in this video!
FuseSchool
Calculating Molar Volumes Using Experimental Data
Learn the basics about Calculating molar volumes using experimental data. How do you calculate molar volumes? How do you use experimental data? Find out more in this video!
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Colligative Properties and Determination of Molar Mass
It discusses about the colligative properties of the solution and derives the relationship between vapour pressure of a solution, mole fraction and vapour pressure of solvent.
Professor Dave Explains
Molar Gas Volume: Stoichiometry With Gases
We know a lot about ideal gases, including how to use all of the ideal gas laws. But we haven't talked much about how to do stoichiometry with gases. As it happens, we can do stoichiometry with gases not just using molar quantities, but...