The Ionic Lattice In most ionic compounds‚ the anions are much larger than the cations‚ and it is the anions which form the crystal array. The smaller cations reside in the holes between the anions. Basic Concepts: 1. Ions are assumed to be charged‚ incompressible‚ nonpolarizable spheres. 2. Ions try to surround themselves with as many ions of opposite charge as closely as possible. Usually in the packing arrangement‚ the cation is just large enough to allow te anions to surround it without
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Ionic compounds are formed when a metal and a non-metal join together. When sodium metal is dropped into a gas jar of chlorine gas the elements react violently to form a new compound called sodium chloride joined by ionic bonds. To understand how this process works‚ we must grasp an understanding of what an ion is and what an ionic bond is. An ion is an atom that has an electric charge and is created when an atom (or a group) gain or loses electrons. (It has an electric charge due to the imbalance
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involved in buiding a covalent bond between these amino acids? Amine and Carboxylic acid = Amide 2. When the covalent bond is built between alanine and glycine‚ which functional group will alanine use for peptide bond? Carboxylic Acid 3. When the covalent bond is built between alanine and glycine‚ which functional group will glycine use for peptide bond? Amine 4. When the covalent bond is built between glycine and alanine‚ which functional group will alanine use for peptide bond? Carboxylic Acid;
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Grade 10 Science –Chemistry Ionic Compounds Science Perspectives 10 - Section 5.6 Pages 192-195 Compound • A Pure Substance composed of two or more elements in a FIXED RATIO Ionic Compound • A compound made up of one or more positive metal ions (cations) and one or more negative non-metal ions (anions) Ionic Bond • The simultaneous strong attraction of positive and negative ions in an ionic compound. As noted‚ ionic bonding occurs between metals and non-metals. Yet‚ “why
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Covalent Bonding In a covalent bond‚ a pair of electrons is shared between two atoms. Each of the positively charged nuclei is attracted to the same negatively charged pair of electrons. The diagram: A and B are held together by this shared attraction. Covalent bonds are often drawn as dots and crosses diagrams to show that the electrons have come from two different atoms. Molecules have a certain fixed number of atoms in them joined together by covalent bonds. Examples: Bonding in hydrogen
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CChemistry Exam #2 Study Guide (10/07/12) I. Bonding a. Ionic Bonding i. Electrons are transferred ii. Ions are held together by electrostatic force b. Covalent Bonding iii. Electrons are somehow shared iv. Electrons are attracted to nuclei (shared) II. Electronegativity c. The ability of an atom in a molecule to attract shared electrons to itself d. Measured on Pauling Scale e. Most electronegative: Fluorine.
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Covalent Compound: Cocaine Cocaine‚ also known as coke‚ is a covalent compound‚ which are molecules that consist of groups of atoms held together by covalent or coordinate bonds. In the United States cocaine is an illegal drug because of the harm it does to a human’s body. It has been used for many years for many different reasons by many different people. Cocaine and it’s leaves‚ which are found on the plant of the Erythroxylen coca (cocaine.org)‚ originated by the South American Indians who have
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Ionic Radius: Definition‚ Calculation‚ and Trends Atoms are microscopic particles that constitute all matter. Despite their tiny size‚ however‚ they can be measured. One way that certain atoms‚ called ions‚ are measured‚ is by ionic radius. The radius is different from an atomic radius and is influenced by the particles’ charges. Use the following information to understand this important measurement in chemistry. What is Ionic Radius? Ionic radius is‚ simply put‚ the radius of an ion. An ion is
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Abstract: When ionic compounds are dissolved in water‚ they break apart into ions. In this lab the opportunity to mix two ionic solutions and observe the results was given. Some ions will remain dissolved and uncombined in the solution even when they are mixed with other ions. When other ions are mixed‚ they form compounds that appear as cloudy or grainy precipitates. The objective of this lab was to observe the formation of compounds and to write the names and formulas of ionic compounds. It is
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A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electromagnetic force attraction between opposite charges‚ either between electrons and nuclei‚ or as the result of a dipole attraction. The strength of chemical bonds varies considerably; there are "strong bonds" such as covalent or ionic bonds and "weak bonds" such as dipole-dipole interactions‚ the London dispersion force and hydrogen bonding
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