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Joshua Latta

on 9 May 2012

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Chemical Bonding In section 1 you will learn about chemical bonding, chemical bond, and valence electrons. Combining Atoms Through Chemical Bonding What are some of the things made up of elements? Some things made of elements are desks, pencils, paper, and even your friends. All substances are made of at least how many different elements? Approximately 100 different elements. Which of the following substances results from combining atoms of carbon, hydrogen, and oxygen? a. Sugar
b. Water
c. Salt
d. Sulfuric Acid a. Sugar.
b. Water
c. Salt
d. Sulfuric Acid Which is not true about electrons when chemical bonds form? a. Electrons are shared
b. Electrons are lost
c. Electrons are destroyed
d. Electrons are gained a. Electrons are shared
b. Electrons are lost
c. Electrons are destroyed
d. Electrons are gained What is an interaction that holds two atoms together? What is the joining of atoms to form new substances? Chemical Bonding Chemical bond Electron Numbers and Organization How can you determine the number of electrons in an atom? How many valence electrons are in an oxygen atom? By the atomic number. 6 What do elements within a group have the same number of? Valence Electrons Which electrons in an atom make chemical bonds? Why? An electron in the outermost energy level is called what? Valence electrons What are Valence Electrons? An electron that is found within the outermost shell of an atom and that determines the atom's chemical properties. The number of electrons on the outermost energy level of an atom determines whether an atom will form bonds. An atom that has fewer than 8 valence electrons is much more likely to form bonds than an atom that has exactly 8 valence electrons is. Sulfur:
An atom of sulfur has 6 valence electrons. It can have 8 valence electrons by sharing 2 eletrons with or gaining 2 electrons from another atom. Magnesium:
An atom of magnesium has 2 valence electrons. It can have a full outerlevel by losing 2 electrons. The second energy level becomes the outermost energy level, and contains 8 electrons. SECTION 2
IONIC BONDS In this section, you will learn about the extraordinary facts of ionic bonds. What is an Ionic Bond? An Ionic Bond is a bond that forms when electrons are transferred from one atom to another, which results in a positive ion and a negative ion. What is an Ion? A charged particle that forms when an atom
or group of atomes gains or loses one or more
electrons. Why are atoms neutral? Atoms are neutral because the number of protons in an atom always equals the number of electrons in the atom. Ionic bonds form during chemical changes when atoms pull electrons away from other atoms. What is Crystal Lattice? The regular pattern in which a crystal is arranged. The strong attraction between ions in a crystal lattice gives ionic compounds certain properties, which include brittleness, high melting points, and high boiling points. Section 3
Covalent and Metallic Bonds. What is a Covalent Bond? A bond formed when atoms share one or more pairs of electrons. What are Molecules? The smallest unit of a substance that keeps all of the physical and chemical properties of that substance. What One way to represent atoms and molecules is to use Electron-Dot Diagrams. An Electron-Dot Diagram is a model that shows only the valence electrons in an atom. What is a Metallic Bond? A bond formed by an attraction between positively charged metal ions and the electrons around them. Positively charged metal ions form when metal atoms lose electrons. Bonding in metals is a result of the metal atoms being so close to one another that their outermost energy levels overlap. Metallic bonding is what gives metals their particular properties. These properties include electrical conductivity, malleability, and ductility. Metallaic bonding allows metals to conduct electric current. For example, when you turn on a lamp, electrons move within the copper wire that connects the lamo to the outlet. What is Ductility? The ability to be drawn into wires. What is Malleability? The ability to be hammered into sheets. END OF SECTION 1 END OF SECTION 2 END OF SECTION 3 So, you've learned about chemical bonding. In the next chapter, you will learn about Chemical Reactions. Good luck! END OF PREZI!!! Even this guy!
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