Ch 3 Molecules compounds moles

Ch 3 Molecules compounds moles - Chapter 3 Molecules,...

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Chapter 3 Molecules, Compounds, and Chemical Equations Dr. Marilyn R. Mackiewicz
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Key Learning Concepts o How is a chemical bond formed? o How do we represent compounds? o How do we view elements and compounds at the atomic level? o What is an ionic compound and how does it differ from a molecular compound? o Naming Compounds o Ionic o Covalent ow do we calculate the formula mass and moles of compounds? o How do we calculate the formula mass o How do we determine a chemical formula from experimental data? o Writing and Balancing equations?
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The 3 majors types of bonding: Covalent, Metallic and Ionic Only focus on ionic and covalent for now. Will go more in depth in future chapters.
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Chemical Bonds o compounds are made of atoms held together by chemical bonds o bonds are forces of attraction between atoms o the bonding attraction comes from attractions t t d l t between protons and electrons Bond Types o two general types of bonding between atoms found in compounds, ionic and covalent o ionic bonds result when electrons have been transferred between atoms, resulting oppositely charged ions that attract each other in oppositely charged ions that attract each other o generally found when metal atoms bonded to nonmetal atoms o covalent bonds result when two atoms share some of their electrons o generally found when nonmetal atoms bonded together
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How can we Visualize Chemical Bonds? Molecular View of Elements and Compounds
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Ionic Bonding Ionic bonding: strong electrostatic interactions between cations and anions that control the formation of a compound. he tions d anions pack in an rderly shion so as to aximize e distance The cations and anions pack in an orderly fashion so as to maximize the distance between like charges and minimize the difference between opposite charges. n = a molecule or atom that has a charge Ion Cation = a positively charged ion Anion = a negatively charged ion Factors that influence strength of ionic bond: 1. Size 2. Charge 1+ 1- 2+ 2- Electrostatic Forces Increase rostatic es ase 1+ 1- 2- 2+ Elect r Forc e Incre a
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Formation of an Ionic Compound When neutral atoms combine to form an ionic compound, there is electron transfer . Salts and minerals use ionic bonding. When you see a metal and a nonmetal in a formula you should automatically think ionic. NaCl, FeS
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Covalent Bonding Covalent bonding: Electrons are shared to form chemical bonds. When you see only nonmetals in a formula, you should automatically think covalent. CH 4 , NO 2 , CH 3 CH 2 OH, H 2 Exceptions: Salts that contain polyatomic ions Such as ammonium sulfate (NH 4 SO 4 ) hemical bonds: e forces that hold the atoms of elements together in a Chemical bonds: the forces that hold the atoms of elements together in a compound
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Types of Chemical Formulas hemical formula mprised of element symbols and numerical subscripts that show the n mpirical formula dicates the relative number of atoms of each element in the A chemical formula is comprised of element symbols and numerical subscripts that show the type and number of each atom present in the smallest unit of the substance.
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Ch 3 Molecules compounds moles - Chapter 3 Molecules,...

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