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por lilpripri

Creative Commons Sunday February 27, 2011

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Welcome to Santas Chemistry Workshop!

Hello Elves! Today our lesson plan is to learn about bonding. - Ionic Bonding - Covalent Bonding - Electronegativities - Polarity - VSEPR Theory - Intermolecular forces

Electron Arrangement (2, on the inner shell) and up to 8 electrons on the outer shells. A stable octet, means that there is a full valence shell, consisting of 8 valence electrons.

So just like a Christmas Bulb, an atom has a nucleus which consists of protons and neutrons while the electrons lie in the energy levels around the nucleus.

Atoms bond to form molecules. In covalent bonding, they share electrons. The goal of an atom is to create a stable octet which has a full outer shell of 8 electrons.

When the elves share gifts, they are covalent bonding. Because they are sharing electrons (gifts). They are also polar. An example of a molecule that is covantely bonded is H-CL.

Ionic bonding is the transfer of electrons. Ionic bonds are formed between metals and non metals.

The name is Bond. Ionic Bond.

Hey that my present! :(

When the thief elf stole the gift (electrons) he transferred it to himself thus ionically bonding as opposed to sharing the electrons which is what the first two elves did.

Hey elves, here is a quick joke to get us in the Christmas spirit! Two sodium atoms are walking through the park, when a chlorine atom runs past. One of the sodiums looks at the other and says "that chlorine just took an electron from me". "Are you sure?" asks his friend. "Yes", says the first, "I'm positive". It is because Na is positively charged whilst Chlorine is negatively charged.

Electronegativity is the tendency of an atom to attract bonding electrons in a covalent bond. Polarity is caused by a difference in electronegativity between two bonded atoms.

Electronegativity is the 'power' of an atom to steal more than its fair share of electrons in a bond. For example when the third elf stole the gift, he wanted more electrons and was eager to get it therefore he was very electronegative. Also oxygen is very electronegative, while hydrogen is not as it is further down the periodic table. When these two bond (h20), the oxygen draws some a charge towards itself, making the hydrogen a bit positive and the oxygen a bit negative. This is a dipole, and because there is a positive and negative end we say water is polar.

Now onto the VSEPR theory. It stands for the Valence Electron Pair Repulsion. In this theory, pairs of electrons that surround the central atom of a molecule or ion are arranged as far apart as possible to minimize electron to electron repulsion. This theory is also used to predict the shapes of molecules.

Can you give us an example Mr. Clause?

Sure! For example, when there are 5 electron pairs surrounding the central atom, the arrangement is a trigonal bipyramid. Whereas methane molecule (CH4) is tetrahedral because there are four pairs of electrons. The bond angle is 109°28'. This is referred to as an AX4 type of molecule.

Last but not least our last topic of todays North Pole Chemistry workshop is the Van Der Waals Forces! They are also known as "London Forces" or "Dispersion forces." They result in a temporary dipole from random movements of electrons. The strength of this force increases with the molar mass of the molecule.

Another fact is that the more elongated the molecule is, the stronger the Van Der Waals forces and the higher its boiling point too.

Thank you elves! Join me during my next Chemistry Workshop to learn more about intermolecular forces! HO HO HO

Welcome to Santas Chemistry Workshop! Hello Elves! Today our lesson plan is to learn about bonding. - Ionic Bonding - Covalent Bonding - Electronegativities - Polarity - VSEPR Theory - Intermolecular forces Electron Arrangement (2, on the inner shell) and up to 8 electrons on the outer shells. A stable octet, means that there is a full valence shell, consisting of 8 valence electrons. | So just like a Christmas Bulb, an atom has a nucleus which consists of protons and neutrons while the electrons lie in the energy levels around the nucleus. Atoms bond to form molecules. In covalent bonding, they share electrons. The goal of an atom is to create a stable octet which has a full outer shell of 8 electrons. | When the elves share gifts, they are covalent bonding. Because they are sharing electrons (gifts). They are also polar. An example of a molecule that is covantely bonded is H-CL. Ionic bonding is the transfer of electrons. Ionic bonds are formed between metals and non metals. | The name is Bond. Ionic Bond. Hey that my present! :( | When the thief elf stole the gift (electrons) he transferred it to himself thus ionically bonding as opposed to sharing the electrons which is what the first two elves did. Hey elves, here is a quick joke to get us in the Christmas spirit! Two sodium atoms are walking through the park, when a chlorine atom runs past. One of the sodiums looks at the other and says "that chlorine just took an electron from me". "Are you sure?" asks his friend. "Yes", says the first, "I'm positive". It is because Na is positively charged whilst Chlorine is negatively charged. Electronegativity is the  tendency of an atom to  attract bonding electrons  in a covalent bond.  Polarity is caused by  a difference in  electronegativity between  two bonded atoms. Electronegativity is the 'power' of an  atom to steal more than its fair share  of electrons in a bond. For example when the third elf stole the gift, he wanted more electrons and was eager to get it therefore he was very  electronegative. Also oxygen is very  electronegative, while hydrogen is not as it is  further down the periodic table. When  these two bond (h20), the oxygen draws  some a charge towards itself, making  the hydrogen a bit positive and the oxygen a  bit negative. This is a dipole, and  because there is a positive and negative  end we say water is polar. Now onto the VSEPR theory. It stands for the Valence Electron Pair Repulsion. In this theory, pairs of electrons that surround the central atom of a molecule or ion are arranged as far apart as possible to minimize electron to electron repulsion. This theory is also used to predict the shapes of molecules. | Can you give us an example Mr. Clause? Sure! For example, when there are 5 electron pairs surrounding the central atom, the arrangement is a trigonal bipyramid. Whereas methane molecule (CH4) is tetrahedral because there are four pairs of electrons. The bond angle is 109°28'. This is referred to as an AX4 type of molecule. Last but not least our last topic of todays North Pole Chemistry workshop is the Van Der Waals Forces! They are also known as "London Forces" or "Dispersion forces." They result in a temporary dipole from random movements of electrons. The strength of this force increases with the molar mass of the molecule. | Another fact is that the more elongated the molecule is, the stronger the Van Der Waals forces and the higher its boiling point too. Thank you elves! Join me during my next Chemistry Workshop to learn more about intermolecular forces! HO HO HO

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lilpripri

lilpripri

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Se unió en February 26, 2011
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