Honors Biology Study Guide Cells‚ organelles and Microscopes 1) * Ocular-Contains a magnifying lens that focuses the image from the objective into your eye. * Body tube- tube that holds eyepiece and connects the objectives. * Turret- part that holds two or more objective lenses and can be rotated to easily change power. * Objectives- increases the magnification used for viewing. * Stage-Supports dish in correct location to lens. * Stage clips- holds down the dish containing
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to volume ratio of the solid reactant. Cutting or making a fine powder of the solid reactant gives the reactant an increased surface area. The reason why the particles are able to react faster when there is a larger surface area is because more particles are exposed to the reactant‚ and more collisions between them occur. After a certain time however‚ the amount of CO2 would have been equal for every size of grain‚ as there was a relatively equal amount of reactants. The only difference between
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Therefore‚ the enthalpy of the reactants with respect to the enthalpy of the products is the overall enthalpy change. The enthalpy change of a process is equivalent to its heat change at constant pressure. Enthalpy Changes in Chemical Reactions Chemical bonds are a source of energy: (breaking a bond requires energy. (creating a bond releases energy. If more energy is released during the formation of product bonds than was required to break the reactant bonds‚ then the process is
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University of the Philippines‚ Diliman 1100 ------------------------------------------------- January 11‚ 2012 DISCUSSION Reaction rates determine the speed at which products are formed from the reactants. Expressed as concentration divided by time‚ reaction rates measure the rate of disappearance of the reactants‚ and‚ conversely‚ the rate of formation of the products1. Not all reactions however proceed at the forward direction only. In some reactions‚ the system appears to have finished the reaction
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occurs when the concentrations of all reactants and all products remain constant. Dynamic equilibrium means reactions are still occurring even though the reaction appears to have stopped changing. The balance of product and reactant at chemical equilibrium is called the equilibrium position‚ and is the point where free energy exists in the lowest possible value. The equilibrium position of a reaction can lay one of three ways: to the left (favoring reactant)‚ to the right (favoring product)‚ or in
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Organic Chemistry Lab II Experiment performed on May 6 and 8‚ 2003 Abstract: The purpose of this experiment was to synthesize dibenzalacetone via an aldol condensation reaction between acetone and benzaldehyde. This was done by mixing the two reactants with NaOH and ethanol‚ then allowing the reaction to sit for thirty minutes. The crystals were then washed with water three times and recrystallized using ethanol. It was then characterized using melting point analysis. The percent yield for this
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• What is the role of glycolysis? Include the reactants and the products. Where does it occur? During glycolysis‚ a team of enzymes splits glucose and forms two molecules of pyruvic acid. After investing 2 ATP at the start‚ glycolysis generates 4 ATP directly. More energy is harvested later from high-energy electrons used to form NADH (Simon‚ Reece‚ & Dickey‚ 2010). • What is the role of the citric acid cycle? Include the reactants and the products. Where does it occur? The citric
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following step process: The reactant molecules CH4 or CO2 (S) are attacked by active species R (radicals and Ar active species) produced by plasma discharges: S + R →products The reaction rate would be: r = k1 R.S‚ with k1: reaction rate constant‚ R = radical concentration‚ S = (CH4 + CO2) concentration. The
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Preparation and Recrystallisation of Aspirin Contents Page Synopsis iii 1 Introduction 1 1.1 Objective 1 1.2 Background 1 2 Theory 1 3 Procedure 2 3.1 Materials 2 3.2 Preparation 2 3.3 Recrystallisation 3 3.4 Determination of Melting Point 3 4 Results and Calculation 4 4.1 Mass 4 4.2 Percent yield 4 4.3 Melting Point 4 4.4 Appearance 4 5 Discussion 5
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Chlorophyll clip_image002Outline the role of photosynthesis in transforming light energy to chemical energy (including raw materials needed for this process) Photosynthesis occurs in all green plants and is the beginning of nearly all food chains therefore a source of life to all living organisms. It is the process where plants transform light energy from the sun into chemical energy. By using light energy trapped by chlorophyll (light absorbing pigment)‚ plants combine carbon dioxide and
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