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!
Visual Learning Systems
Measuring Mass and Volume: Using a Balance
This program begins by discussing common ways mass and volume are measured in the home. The video highlights how mass and volume are measured with various types of equipment in the school science lab. Some of the different tools used to...
Flipping Physics
Dear @MarkRober, Could You Show Your Work Better, Please?
In this video, we discuss the terminal velocity calculations shown in Mark Rober's "Egg Drop From Space" video, and suggest ways to make the work more clear and easier to understand. We also provide a more detailed solution to the...
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
Practice Problem: Enthalpy of Combustion
Stoichiometry for combustion? You bet! If we know about moles, we can calculate energy changes. Give it a try!
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
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
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: 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!
Professor Dave Explains
Practice Problem: Enthalpy of Vaporization
Can we do stoichiometry regarding phase changes? Sure! If we know how many moles of a substance we have, and the energy associated with each mole of that substance undergoing a particular phase change, we can get the energy associated...
Curated Video
Ordering Numbers: Units of Weight
This video shows the process for solving the problem presented in SATs 2022 Paper 2 Q12, which involves ordering masses of parcels. Students will learn how to convert between different units of mass, such as converting kilograms to grams...
Curated Video
Wordy Real-Life Problems: Calculating Revenue and Profit
This video shows the process for solving the problem presented in IGCSE A June 2018 paper 2HR Q3, which involves calculating revenue and profit. Students will learn how to calculate the number of items sold at different prices and how to...
Curated Video
Calculating Yield and Percentage Yield in Chemical Reactions
The video discusses two important quantities in chemistry, yield and percentage yield, which are used to determine the effectiveness of a chemical reaction. The video also mentions the concept of atom economy, which measures the amount...
Let's Tute
Some Stupid Math Mistakes: Basic Math Units and Conversions
In this video, we learn about the importance of units in measuring and estimating different items in our day-to-day life. The video explains how different units are used for measuring liquids, solids, and small quantities of medicines....
Catalyst University
Conversion of Calories to Fat Weight: Part 1 of 2
View Part 2 of this 2-video series next in the Kinesiology/Personal Training Playlist in which we convert the avocado's calories to body fat weight.
Curated Video
Calculating Balancing Numbers in Chemical Reactions and Limiting Reactants
The video explains how to use the masses of reactants and products in a chemical reaction to calculate the balancing numbers in a symbol equation. Two examples are provided to illustrate the process, and the concept of limiting reactants...
Schooling Online Kids
The Life Stage Series: Mental Development - Rocky Weighs In
Rocky the Joey is weighing in for his big boxing match! He needs to weigh at least 10 kilograms. He steps on the scales and… Uh oh. Rocky only weighs 7 kilograms! Join Rocky as he learns how to measure weight, height and capacity. In...
FuseSchool
Human growth curves
When a baby is born, how do the doctors, nurses and midwives check that it is healthy? Apart from blood tests and visual inspections in some countries, the easiest way to check a baby is healthy is to weigh it. A low or high birth weight...
The Backyard Scientist
Hexamine synthesis. Ammonia and formaldehyde.
So i was wrong on my math. 6grams to 4grams is wrong and im stupid. The correct stochiometry would be 68g ammonia with 180g of formaldehyde.
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...
FuseSchool
How To Use Moles - Part 1
Learn the basics about using moles. This is part 1 of 3 parts, teaching you about using moles, as a part of the chemical calculations topic. Avogadro’s number describes what is known as 1 mole, or 12 g of carbon atoms. This is used in...