CELL STRUCTURE CELL THEORY: Structural and functional unit of all living things New cells arise from already existing cells Cells contain information that instructs growth. This information can be passed onto new cells. MICROSCOPES: There are two main types of microscopes: Light and Electron Electron Micrographs- shown in colour LIGHT ELECTRON Uses beam of light Magnification = x1500 Resolution = 200 nm Wide range of specimens can be used Samples are fairly quick + easy to prepare
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IMITATION VANILLA ESSENCE Vanillin may be removed from imitation vanilla essence by mixing it with an organic solvent such as dichloromethane and then mixing the vanillin molecule with dilute sodium hydroxide to make it into a sodium salt so that it is in its aqueous phase (Southam‚ 2013). This is done as in the first step the pure vanillin is attracted to the dichloromethane as they are both organic structures and have similar intermolecular forces (dispersion). The second step involves mixing it with
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follow‚ the company is able to save time and provide maximum assistance and satisfaction to all the employees and clients. In education‚ the computer laboratory is usually monitored‚ Due to the high number of computers in a lab; technicians are having difficulties in monitoring computers. Institutions implement proper maintenance of computer laboratories with the help of a monitoring system. Iowa State University is an example. There are many computer labs on campus‚ including both public labs and college
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Regents Chemistry Quarter 1 Midterm Review 1. The percent by mass of oxygen in Na2SO4 (formula mass = 142) is closest to 1) 11% 3) 45% 2) 22% 4) 64% 2. Given the unbalanced equation: __Al(s) + __O2(g) → __Al2O3(s) 3. 4. 5. 6. 7. balance the equation using smallest whole number coefficients. The percent by mass of aluminum in Al2O3 is approximately 1) 18.9 3) 47.1 2) 35.4 4) 52.9 What is the approximate percent composition by mass of CaBr2 (formula mass = 200)
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Anthony Martinez Mr. Hruby Chemistry R Period 4(5A) Name & Symbol: Platinum (Pt) Properties: -Atomic Number: 78 -Atomic Mass: 195.084 amu -Appearance: Shiny‚ smooth surface‚ silver like‚ solid. Melting point (K): 2045 Boiling point (K): 4100 Valence electrons: (+1)‚ +2‚ (+3)‚ +4‚ +6 Atomic radius (pm): 139 1st Ionization energy (kJ/mol): 868.1 Electronegativity: 2.28 Natural Occurring Isotopes: Six stable isotopes of platinum occur in nature (190‚ 192‚ 194
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SCIENCE RATIONALE This syllabus is prepared with a view to address new trends in integrated science teaching and science teacher education. Science has gained world-wide acceptance as a course of study for various reasons such as the concern for social relevance and environmental issues. The teacher is seen‚ as the key to the success of the Educational Reform in Zambia and the effective implementation of the science curriculum will thus depend on the commitment‚ competence and resourcefulness
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Light‚ Refraction and Lenses Name: Light Refraction Read from Lesson 1 of the Refraction and Lenses chapter at The Physics Classroom: http://www.physicsclassroom.com/Class/refrn/u14l1a.html http://www.physicsclassroom.com/Class/refrn/u14l1b.html http://www.physicsclassroom.com/Class/refrn/u14l1c.html http://www.physicsclassroom.com/Class/refrn/u14l1f.html MOP Connection: 1. 2. Refraction and Lenses: sublevels 1 and 2 Write a one-word synonym for refraction. Refraction occurs when light crosses
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Unit 1: Assignment 1: Installing Server Roles with a Batch File Questions: 1. What does the /w switch do? Why is it used? o The /W switch is used with all products installing with SCCM/SMS so it doesn’t do anything product specific. The W switch tells the machine to wait and let the first install finish before it tries to start the second install‚ that it. 2. What switch is used to remove a role? Remove-ManagementRole cmdlet to remove custom management roles that you don’t need anymore
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Module 4: 10. Strong Bases: NaOH‚ KOH‚ Na2CO3‚ NaHCO3‚ Na3PO4‚ NaHPO4‚ Strong Acids: Fe(NO3)3‚ HCL‚ HNO3‚ Al(NO3)3‚ NiCl2‚ H2SO4 11. Acidic Neutral Basic NaCl KNO3 NaOH HC2H3O2 Na2CO3 NaC2H3O2 NaHCO3 Fe(NO3)3 NaNO3 Na3PO4 HCl MgSO4 KOH HNO3 Na2SO4 NaHPO4 CuSO4 NaNO2 CoCl2 Al(NO3)3 NiCl2 H2SO4 KCl NH4Cl 12. CuSO4 CuCO3.Cu(OH)2(s) + 2 H2SO4(aq) ----> 2 CuSO4(aq) + CO2(g) + 3 H2O(l) Na3PO4 Na3PO4 (aq) + 3H2O (l) --> H3PO4 (aq) + 3NaOH
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Experiment 9 : The effect of substrate concentration on enzyme activity Objective To find out the relationship between the substrate concentration and the rate of reaction by determining the number of bubbles produce Hydrogen peroxide (H2O2) is a by-product of biochemical metabolism. An accumulation of hydrogen peroxide can be deadly‚ so it has to be decomposed. One of the decomposing factors is an enzyme called Catalase. Catalase breaks hydrogen peroxide into water and oxygen. The chemical
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