Stick Welding Polarity Explained: AC vs DCEP vs DCEN | polarity

Stick Welding Polarity Explained: AC vs DCEP vs DCEN


นอกจากการดูบทความนี้แล้ว คุณยังสามารถดูข้อมูลที่เป็นประโยชน์อื่นๆ อีกมากมายที่เราให้ไว้ที่นี่: ดูความรู้เพิ่มเติมที่นี่

An informative explanation and demonstration of polarity in stick welding.
Shielded metal arc welding (SMAW), also known as manual metal arc welding (MMA), stick welding or rod welding can be set up with different polarities. In this video, we compare Direct Current Electrode Positive (DCEP or Reverse Polarity), Direct Current Electrode Negative (DCEN or Straight Polarity) and Alternating Current (AC).
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Stick Welding Polarity Explained: AC vs DCEP vs DCEN

Polar Molecules Tutorial: How to determine polarity in a molecule


This video looks at how to determine polarity in a molecule by understanding how the bond polarities, molecule shape, and outside atoms influence polarity using bond polarity vector addition. This includes a flow chart that guides you through the various decisions needed to determine if a molecule is polar or not.
Link for PT with electronegativities: https://drive.google.com/file/d/0B03UoApk5ahyWG9CaUkzMnZiR28/view

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Stoichiometry Tutorial, step by step
Types of Chemical Reactions: How to classify five basic reaction types
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Polar Molecules Tutorial: How to determine polarity in a molecule
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Wikipedia: In chemistry, polarity is a separation of electric charge leading to a molecule or its chemical groups having an electric dipole or multipole moment.
Polar molecules must contain polar bonds due to a difference in electronegativity between the bonded atoms. A polar molecule with two or more polar bonds must have a geometry which is asymmetric in at least one direction, so that the bond dipoles do not cancel each other.
While the molecules can be described as \”polar covalent\”, \”nonpolar covalent\”, or \”ionic\”, this is often a relative term, with one molecule simply being more polar or more nonpolar than another. However, the following properties are typical of such molecules.
A molecule is composed of one or more chemical bonds between molecular orbitals of different atoms. A molecule may be polar either as a result of polar bonds due to differences in electronegativity as described above, or as a result of an asymmetric arrangement of nonpolar covalent bonds and nonbonding pairs of electrons known as a full molecular orbital.
The water molecule is made up of oxygen and hydrogen, with respective electronegativities of 3.44 and 2.20. The dipoles from each of the two bonds (red arrows) add together to make the overall molecule polar.
A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other. The dipoles do not cancel out resulting in a net dipole. Due to the polar nature of the water molecule itself, polar molecules are generally able to dissolve in water. Other examples include sugars (like sucrose), which have many polar oxygen–hydrogen (−OH) groups and are overall highly polar.
If the bond dipole moments of the molecule do not cancel, the molecule is polar. For example, the water molecule (H2O) contains two polar O−H bonds in a bent (nonlinear) geometry. The bond dipole moments do not cancel, so that the molecule forms a molecular dipole with its negative pole at the oxygen and its positive pole midway between the two hydrogen atoms.
The hydrogen fluoride, HF, molecule is polar by virtue of polar covalent bonds – in the covalent bond electrons are displaced toward the more electronegative fluorine atom. Ammonia, NH3, molecule the three N−H bonds have only a slight polarity (toward the more electronegative nitrogen atom). The molecule has two lone electrons in an orbital, that points towards the fourth apex of the approximate tetrahedron, (VSEPR).
When comparing a polar and nonpolar molecule with similar molar masses, the polar molecule in general has a higher boiling point, because the dipole–dipole interaction between polar molecules results in stronger intermolecular attractions. One common form of polar interaction is the hydrogen bond, which is also known as the Hbond.

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Polar Molecules Tutorial: How to determine polarity in a molecule

A Level Chemistry \”Polar Bonds and Polar Molecules\”.


In this video, we look at how bonds can be polar or nonpolar. I take you through the idea of bond polarity in terms of electronegativity. We then look at the two ways to show that a bond is polar. We then explore how a molecule can have an overall polarity (dipole moment) and why certain molecules are nonpolar even when they have bond polarity.

A Level Chemistry \

A Polarity Therapy \”General Session\”


John Chitty, RPP, BCST, describes a Polarity Therapy \”General Session.\” Since the 1970’s, many practitioners and schools have come up with varying \”general sessions\” and protocols, often involving as many as 20 hand positions and usually focusing on the 5 elements. This \”general session\” is much simpler. It features only 5 hand positions and focuses on the 3 principles, which is the origin of the term \”Polarity.\”\r
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For more information, please visit www.energyschool.com

A Polarity Therapy \

what is POLARITY?


a brief description of the unique polarity of water for the cards against humanity science ambassador scholarship
sources:
my amazing chem teacher
http://www.biology.arizona.edu/biochemistry/tutorials/chemistry/page3.html

what is POLARITY?

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