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The goal of the following video is to give the "big picture" of the mole and its applications; information on how to use the mole in calculations can be found in another tutorial. Recent textbooks refer to this as "molar mass" to emphasize i that this term refers to the mass, not the weight, of substance, and ii that the quantity refers to a mole of a substance, not a single molecule.
For this reason, we continue to use "molecular weight" in this course.
The Mole Movie Text The mole is one of the central concepts in stoichiometry. We will see it come up time and time again. The word "mole" refers to a specific number of molecules: A dozen eggs is 12 eggs, a dozen cars is 12 cars, and a dozen water molecules is 12 molecules. A mole of eggs would be 6.
A mole of water molecules, however, the equivalent of 6. Just as the dozen is a useful quantity for counting eggs, the mole is a useful quantity for counting molecules.
The mole allows us to connect the macroscopic world, the surroundings we percieve, to the molecular scale, where chemistry occurs. On the macroscopic scale, we think in terms of grams of a substance. On the molecular scale, we think in terms of molecules, in moles.
If a substance is in solution, we use molarity, which is moles per liter.
The connection between these two realms is made with molecular weight. So where is this useful? When we weigh out a certain number of grams of a substance, we are working at the macroscopic scale. If we then perform a chemical reaction, that reaction occurs at the molecular scale.
For instance, in the reaction: If we want to understand how much oxygen or hydrogen will be consumed in a reaction, or how much water will be produced, we need to think in terms of the number of molecules of oxygen, hydrogen, and water. Conversely, in the laboratory, we must deal with grams of hydrogen, oxygen, and water.
This unit can be used to introduce the mole concept in any chemistry class, grades Goals for the Activities ACTIVITY # 1 Introduction to the Mole or class data to fill in the information below: Developed through the National Science Foundation-funded. mass)) 1.). Introduction to the idea of a mole as a number (vs. an animal) Let's talk about a concept that probably confuses chemistry students the most on some level. chemistry mole concept- relative atomic mass 3,x10^23 mole concept exam and solutions another way to measure relative atomic mass mole concept examples.
The molecular weight is the key to going back and forth between the macroscopic scale, where we weigh things, and the microscopic scale, where molecules react with one another. Another place where the mole is useful is when you know the number of molecules and need to find the weight.
For example, chemists will often shine light on a sample and see how much light it absorbs. From this, they can obtain the number of molecules. It appears, explicitly or implicitly, everywhere molecular weight must be related to the mass of a substance. Below you will find some practice questions to get you used to the concepts and calculations concerning the Mole.Show all work and remember to use significant figures and units!
1. Predict the products and balance the equation for the reaction between sodium bicarbonate. In other words, a mole is a unit that we use to represent x10 23 particles of the same matter.
Describing further, a mole is the total amount of substance that contains as many atoms, molecules, ions, electrons or any other elementary entities as there are carbon atoms in exactly 12 gm of it. In a general chemistry class, you usually end up having to perform a lot of conversions involving moles (mol).
Whether you’re converting from moles to grams, moles to volume, or moles to particles (atoms or molecules), use this quick guide to remind you of how to do each type of mole conversion. A mole is basically an amount of something.
In chemistry, a mole is known as a chemical mole. To figure out the weight of a mole, you figure out the molar mass. On Oct. 23, between a.m. and p.m., chemists celebrate Mole Day. Mole Day is not a day to celebrate those furry little creatures that live in the ground.
As I mentioned in the past tutorial, the word “mole” refers to x 10²³ things. Because this is a really really big number, the only thing we use this number for is .