| | notation. We will practice fun and easy algebra solving mysteries for unknowns. We will discuss the difference between precision and accuracy. We will learn when we can round numbers and when we cannot -- a concept called SIGNIFICANT FIGURES!!!
Unit 3: Electrons in Atoms and Period Table (September 21 - October 2) Where exactly are these electrons? You will become a master of the elements of our Earth if you learn the Periodic Table trends and what makes an atom reactive. Although the Periodic Table is primarily organized by number of protons contained in an atom of an element. It is further organized into groups and periods. There are several other relationships that can be drawn from the organization of the elements. This is known as Periodic Law.
Chapter 5 - Electrons in Atoms - contains the following topics: Light and Quantized Energy Quantum Theory and the Atom Electron Configurations Chapter 6 - The Periodic Table and Periodic Law -is divided into the following topics: Development of the Modern Periodic Table Classification of the Elements
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Spring Semester
Unit 6 - Gases, Acids and Bases, and Solutions Chapter 13 (1/4/11 - 1/19/11) Gas Pressure and Phase Diagrams Students know the random motion of molecules and their collisions with a surface create the observable pressure on that surface. Students know the random motion of molecules explains the diffusion of gases.
Chapter 14 (1/20/11 - 2/14/11) Students know how to apply the gas laws to relations between the pressure, temperature, and volume of any amount of an ideal gas or any mixture of ideal gases. Boyle's Law, Charles Law, Guy Lussac's Law, Combined Gas Law and Ideal Gas Law
Chapter 19 Acids and Bases (2/15/10 - 2/21/10) Acids and bases are present in the soil of Earth, the foods you eat and the products you buy. Remember amino acids that make up proteins crucial for your existence. Compare aids and bases, define and calculate pH and pOH of aqueous solutions. Explain how buffers work to resist changes in pH Chapter 15 Solution (2/22 - 3/5) Solutions are homogeneous mixtures of two or more substances. As a basis for understanding this concept: Students know the definitions of solute and solvent. Students know how to describe the dissolving process at the molecular level by using the concept of random molecular motion Students know temperature, pressure, and surface area affect the dissolving process. Students know how to calculate the concentration of a solute in terms of grams per liter, molarity, parts per million, and percent composition.
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Unit 7 - Thermodynamics, Equilibrium, and Reaction Rates Thermodynamics (3/15-3/19) Energy is exchanged or transformed in all chemical reactions and physical changes of matter. CA Standards for mastery 7a. Temperature and heat flow are described in terms of the motion of molecules (or atoms). Temperature is a measure of the average kinetic energy of molecular motion in a sample. Heat is energy transferred from a sample at higher temperature to one at lower temperature. Often, heat is described as flowing from the system to the surroundings or from the surroundings to the system. The system is defined by its boundaries, and the surroundings are outside the boundaries, with “the universe” frequently considered as the surroundings.
7. b. Chemical processes can either release (exothermic) or absorb (endothermic) thermal energy. Endothermic processes absorb heat, and their equations can be written with heat as a reactant. Exothermic processes release heat, and their equations can be written with heat as a product. The net heat released to or absorbed from the surroundings comes from the making and breaking of chemical bonds during a reaction: breaking a bond always requires energy and making a bond almost always releases energy. The amount of energy per bond depends on the strength of the bond.
The potential energy of the reaction system may be plotted for the different reaction stages: reactants, transition states, and products. This plot will show reactants at lower potential energy than products for an endothermic reaction and reactants at higher potential energy than products for an exothermic reaction. A higher energy transition state usually exists between the reactant and product energy states that affect the reaction rate.
7. c. Energy is released when a material condenses or freezes and is absorbed when a material evaporates or melts. Physical changes are accompanied by changes in internal energy. Changes of physical state either absorb or release heat. Evaporation and melting require energy to overcome the bonds of attractions in the corresponding liquid or solid state. Condensation and freezing release heat to the surroundings as internal energy is reduced and bonds of attraction are formed
Reaction Rates (3/22-3/24) 8. Chemical reaction rates depend on factors that influence the frequency of collision of reactant molecules. As a basis for understanding this concept: a. the rate of reaction is the decrease in concentration of reactants or the increase in concentration of products with time. b. reaction rates depend on such factors as concentration, temperature, and pressure. c. catalysts increases the reaction rate. A catalyst increases the rate of a chemical reaction without taking part in the net reaction. A catalyst lowers the energy barrier between reactants and products by promoting a more favorable pathway for the reaction. Surfaces often play important roles as catalysts for many reactions. One reactant might be temporarily held on the surface of a catalyst. There the bonds of the reactant may be weakened, allowing another substance to react with it more quickly. Living systems speed up life-dependent reactions with biological catalysts called enzymes.
Chemical Equilibrium ( 3/25 - 3/26, 4/6-4/9)
Chemical equilibrium is a dynamic process that occurs when there is not changes in a product or reactant concentration that undergo reversible reactions with several factors affecting equilibrium that must be considered when writing expressions used to quantify a state of equilibrium. Changes in heat accompanying chemical reactions and spontaneity of chemical reactions are key topics, along with physical states of substances undergoing chemical reactions, for example gases respond to changes in pressure and volume. Calculation of concentration and molarity for solutions, particularly for aqueous solutions and use of exponents are needed to solve quantitative problems.
When a stress is applied to a chemical reaction in equilibrium, a shift will occur to partly relieve the stress.
Organic Chemistry The bonding characteristics of carbon allow the formation of many different organic molecules of varied sizes, shapes, and chemical properties and provide the biochemical basis of life. As a basis for understanding this concept: 10a. Students know large molecules (polymers), such as proteins, nucleic acids, and starch, are formed by repetitive combinations of simple subunits. Polymers as consisting of repetitive and systematic combinations of smaller, simpler groups of atoms, including carbon. All polymeric molecules, including biological molecules, such as proteins, nucleic acids, and starch, are made up of various unique combinations of a relatively small number of chemically simple subunits. For example, starch is a polymer made from a large number of simple sugar molecules joined together. 10. b. Carbon bonding results given carbon’s four bonding electrons and four vacancies available to form bonds, allowing the formation of a large variety of structures ranging from simple hydrocarbons to complex polymers and biological molecules. covalent bonds—single or multiple—with other carbon atoms and with atoms of other elements. The compounds range from simple hydrocarbon molecules (e.g., methane and ethane) to complex organic polymers and biological molecules (e.g., proteins) and include many manufactured polymers used in daily life (e.g., polyester, nylon, and polyethylene). 10. c. Amino acids are the building blocks of proteins. Proteins are large single-stranded polymers often made up of thousands of relatively small subunits called amino acids. The bond attaching two amino acids, known as the peptide bond, is identical for any pair of amino acids. The chemical composition of the amino acid itself varies. Variation in composition and ordering of amino acids gives protein molecules their unique properties and shapes. These properties and shapes define the protein’s functions, many of which are essential to the life of an organism. The blueprint for building the protein molecules is deoxyribonucleic acid (DNA). Biotechnology is advancing rapidly as more is learned about DNA, amino acid sequences, and the shapes and functions of proteins.
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An analogy can be made with a pair of escalators operating between two floors. If the same number of people go up as go down in a ten-minute interval, the rate of people moving up equals the rate of people moving down. Overall, any extra people arriving on one floor are canceled out by others leaving the floor. Therefore, the number of people on each floor will be constant over time, and the population of the two floors is in dynamic equilibrium. This analogy can be extended to a chemical reaction by considering that if the number of moles produced in one direction of the reaction is the same as the number consumed in the opposite direction, then the reaction has reached a state of dynamic equilibrium.
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