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ChemicalEquationsandFormulasLab

ChemicalEquationsandFormulasLab -...

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Matter & Energy: Equations and  Formulas Overview The lesson focuses on the concepts of naming elements, molecules and compounds, The Law of Conservation of Matter through balancing chemical equations and writing chemical formulas. The students will make several 3-d models and infer proper conclusions from them. Related Standards of Learning CH.3 A-C The student will investigate and understand how conservation of energy and matter is expressed in chemical formulas and balanced equations. Key concepts include: Nomenclature; Balancing chemical equations Writing chemical formulas (Molecular; structural, empirical, and Lewis diagrams) Objectives Students will learn when a toms form compounds they undergo a chemical change. An example of one of the changes they undergo is they lose or gain electrons Ions, cations, and anion will be introduced to the students Students will learn that ions may be positive or negative and they are formed when an atom or a group of atoms either gains an electron or lose electrons. Cations are positive and are identified as metals. They lose electrons when chemically combined. In naming compounds the cations are named first using their names as it appears on the periodic table. Anions are negative and are identified as nonmetals. They gain electrons when chemically combined. In naming compounds the anions are named second or after cations. The ending of their elemental name is changed to an “ ide”. Students will understand that a binary compound consists of a compound that contains two different elements. Ternary compounds contain the atoms from three different elements Roman numerals are used to name cations, which have more than one charge. Students will learn how to write compounds by using the “criss-cross” method. Students will learn in a balanced chemical equation the same number of atoms of the element or compound is found on both the reactant side and the product side.
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Materials Needed Demo Materials bare cooper wire zinc chips charcoal an empty covered jar a beaker of the compound water __________________________ 250 mL beaker 250 mL flask White vinegar Steel wool Balloon Balance Periodic Tables Lab Materials per group Solution of NaOH Solution of CuSO 4 Solution of NH 4 OH Solution of Zn(NO 3 ) 2 Four 3 oz. plastic cups Three 5 oz. plastic cups Balance Graduated cylinder ------------------------------ four pipe cleaners one large plastic foam ball four small plastic foam balls metric ruler protractor Instructional Activity  Content, Teacher Notes a) This lesson takes 4-90 blocks b) For complete understanding of modern chemical nomenclature the students must be familiar with the following terms: Ions molecule chemical formula Cation molecular compounds molecular formula Anion ionic compounds formula unit Binary ternary polyatomic ions c) The concept of empirical formulas can be introduced on day four however, really should be taught after introducing the mole.
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Introduction Nomenclature 1. Display samples of common elements (e.g., bare cooper wire, zinc chips,
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