Water is a special substance for several reasons, and you may have noticed an important one right in your cold drink: ice. Solid ice floats in liquid water, which isn't true for most substances. But why? George Zaidan and Charles Morton explain the science behind how how hydrogen bonds keep the ice in your glass (and the polar ice caps) afloat.
Boiling points are a measure of intermolecular forces. The intermolecular forces increase with increasing polarization (i.e. difference in electronegativity) of bonds. The strength of the four main intermolecular forces (and therefore their impact on boiling points) is ionic > hydrogen bonding > dipole dipole > dispersion. Boiling point increases with molecular weight, and with surface area.
Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule. This includes valence-shell electron-pair repulsion (VSEPR) theory to predict molecular shape and bond angles.
Atoms are so tiny; it is practically impossible to hold them with any instrument. So how is the mass of a single atom calculated then? Watch this video which gets us introduced to the interesting concept of Atomic Mass.
In this video, we will learn:
0:00 How do we calculate the mass of a single atom?
1:50 Calculating mass of an atom wrt a carbon atom
2:41 One atomic mass unit
3:56 What exactly gives the atom its mass?
This chemistry video tutorial explains how to find the empirical formula given the mass in grams or from the percent composition of each element in a compound. If you're given the mass percent, you can simply treat it as if you were given the mass in grams. This video explains how to find the molecular formula given the molar mass of the compound. You can do this once you have the empirical formula. This video explains all of it. It has plenty of practice problems and examples for you to master this lesson.
This chemistry video tutorial provides an introduction to moles. It explains the concept of moles and how it relates to mass in grams by the molar mass of a compound. It also explains how moles relate to atoms and molecules through Avogadro's number.
This chemistry video tutorial explains the conversion process of moles to atoms and how to convert the number of atoms to moles. This tutorial contains plenty of examples and practice problems. This tutorial is useful for calculating stoichiometry problems.
In this education video by The Fuse School, you are going to learn about:
- How to calculate Relative Atomic Mass
- How to calculate Relative Atomic Mass for different elements
- Calculating total mass number of isotopes
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This video is an introduction to ionic bonding, which is one type of chemical bonding. Ionic bonds hold together metal and nonmetal atoms. In ionic bonding, electrons are transferred from a metal atom to a nonmetal atom, creating ions. These ions have opposite charge, so they stick together.
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In this video, we continue exploring ionic bonding, this time looking at the properties of ionic compounds. First we look at how ionic compounds form a giant ionic lattice and then we look at why they have high melting and boiling points and why they cannot conduct electricity as solids but can when they are molten or dissolved in water.
This video covers basic about the heat treatment of the steel
It covers an introduction about the heat treatment processes like
suitable heat treatment is depend upon the final requirement of the metal.
after viewing this video difference between harder steel and ductile steel can be understood.
knowledge of the heat treatment is important for Engineers , inspectors , supervisors and other associated directly or indirectly with Metal Industries.
In this video we'll be looking at zinc(Zn), copper (Cu), potassium (K), calcium (Ca), iron (Fe), lithium (Li), magnesium (Mg) and sodium (Na) and their reaction to water and acid.
You may have noticed that most of the elements in the Periodic table are metals. All metals have similar physical and chemical properties, but not identical. By looking at a small number of metals we can investigate how they vary chemically, which we will do in this video.
Animation & Design: Joshua Thomas firstname.lastname@example.org
Narration: Dale Bennett
Script: Alistair Haynes
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