Tutorial Note 5 • Chapter 17 Hypothesis Testing • Chapter 18 Measures of Association Objective: Computer laboratory session (II) – Please refer to the Computer Lab Notes Discussion Question 1 H0 – Null Hypothesis: a statement you want to reject (E.g Average = 50) H1/HA – Alternative Hypothesis: a statement you want to prove (E.g Average is not 50) What is related/dependent sample? H0: Tutorial is NOT effective H1: Tutorial is effective |Respondent |Before
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PRE-LAB The purpose of the lab is to determine the moles of hydrogen gas and then molar mass of the metal. First‚ the metal assigned to each group must be weighed out in order to ensure the hydrogen gas produced will not exceed the capacity for the gas measuring tube. Then‚ copper will be wrapped around the metal leaving 6-8cm at the end for a handle. The end wire will be bent into a hook to keep the sample at the bottom of the tube and increase the oxidation rate. A ring stand will need to be
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Lab Report: Titration Lab Prepare a solution of a given concentration; understand titration including acid-base reactions‚ pH‚ stoichiometry and molar equivalence. Chemicals and equipment: NaOH pellets close to purity‚ HCl 3M‚ phenolphtalein Beckers‚ flasks‚ burette‚ magnetic or manual stir pHmeter Waste management: The waste disposal will be handled through neutralization of your excess reactant to a pH between 4.0 and 10.0 and disposal with abundant rinsing. As a preparation for the
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OIL AND GAS EXPLORATION: INTERROGATING THE OIL COMPANY’S ADHERENCE TO ARTICLE 40 ON COMMUNITY COMPENSATION Indigenous communities across the globe have been victims of unwarranted exploitation by private investors in the search for among others oil and gas. Whenever governments and oil companies intend to enrich themselves from the oil revenue‚ history has indicated that voiceless citizens are subjected to inhuman treatment and torture‚ deprivation of their indigenous community rights‚ disruption
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Experiment 3: Evaluation of Gas Constant Purpose: The purpose of this lab is to demonstrate the ideal gas law under ordinary conditions. In this lab‚ the variables in the ideal gas law are known or can be found aside from the constant R. Thus‚ the R values can be found and relatively determine the relevancy of the ideal gas law to the lab conditions. The ideal gas law was tested using the reaction: Mg (s) + 2HCl2 (aq) H2 (g) Procedure: 1. Ribbons of magnesium (5) were cut to the approximate
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Bhopal Gas Tragedy Product - Brand name Sevin (Union Carbide) - Third most used insecticide in US - Not fatal to people Carbaryl - Does not cause cancer Chemistry TLV = 0.02 ppm Methyl isocyanate Methyl Isocyanate (MIC) Clear‚ colourless‚ b.p. 39oC‚ odour threshold 2.1 ppm Effects of 0.4 ppm - Coughing - Chest pain - Breathing pain (dyspnea) - Asthma - Eye irritation - Nose‚ throat‚ skin damage Effects of 21 ppm - Lung oedema - Emphysema (damage of lung tissue) - hemorrhaging - bronchial
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titrate an unknown solid acid. The equivalent mass of the solid acid will be determined from the volume of sodium hydroxide added at the equivalence point. The equilibrium constant‚ Ks‚ of the solid acid will be calculated from the titration curve obtained by plotting the pH of the solution versus the volume of sodium hydroxide added. III.Background Information: Volumetric analysis is the use of volume measurements to analyze an unknown; a method of this is titration. Titration is most often used
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Greenhouse gas Greenhouse effect schematic showing energy flows between space‚ the atmosphere‚ and Earth’s surface. Energy exchanges are expressed in watts per square meter (W/m2). A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.[1] The primary greenhouse gases in the Earth’s atmosphere are water vapor‚ carbon dioxide‚ methane‚ nitrous oxide‚
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Sample Lab Report: Factors which Affect the Activity of the Enzyme Catalase Purpose: Must include: background information about concepts involved in the lab‚ statement of purpose of the lab identification of independent and dependent variables. A hypothesis is often not necessary or appropriate. Enzymes are proteins that speed up chemical reactions in cells. They break down molecules called substrates. Each enzyme has only one substrate that it breaks down. Enzymes are produced in
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calculate the number of moles of each reactant. 3. To predict which reactant is in excess. 4. To use drawings to relate microscopic events‚ to write a chemical equation that represent those microscopic events. 5. To learn how to measure the volume of a liquid using a buret. Prelab Questions: 1. Calculate the number of moles in 2.65g of zinc. 2. Calculate the number of moles of hydrochloric acid in 37.5mL of a 3.00M HCl solution. 3. Calculate how many moles of HCl are
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