Chemistry Mid-term Exam Version 2/23/15 Name: Student number: Directions: It is important that you provide answers in your own words. Please focus only on information from the text/eBook to create your own solutions. Please do not use direct information from an outside source (especially copying and pasting from an “answer” website). Use of direct information from an outside source is against school policy. All answers will be checked for plagiarism. Instances of plagiarism can result in
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Part A. 2. Record your observations in a table. 3. Dispose of the contents of the well plate as directed by your teacher. Clean your workstation and wash your hands. Observations: Reactants | Physical Properties | Results | Physical/Chemical Changes | Copper (II) sulfate | Blue, clear, liquid | N/A | N/A |
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Naturally occurring metals Copper, silver, gold and platinum are the four most un-reactive metals. This means that they do not form compounds and can exist as simple lumps of the metal in the rock. They can be found native. These are easy to extract since they can be mined. Also, you can even find pieces of gold in streams. More reactive metals are not found in lumps and must be extracted from the rocks in which they occur. Roasting in oxygen For all this extraction processes, the rock must
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Written Assignment 1: Intermolecular Forces and Liquids and Solids Answer all assigned questions and problems, and show all work. 1. Explain and give an example for each type of intermolecular force. A: a. Dipole-dipole interaction: a dipole-dipole interaction is the electrostatic attraction between the positive end of one polar molecule and the negative end of the other. Dipole-dipole attraction occurs between molecules which are permanent dipoles (polar covalent molecules). An example
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the magnifying power of the most powerful optical microscope in the world, we would still not be able to see an atom. 4. Chemical compounds are made up of about 100 distinct elements. Atoms are the smallest subdivision of matter that still retains chemical properties of a substance. A quark is the smallest particle that exists. Electrons form atoms that in turn determine chemical properties of a substance. 5. The number of protons makes an element distinct. 6. Brownian motion has to do with random
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Purity of a substance report Create a report describing the factors that influence the purity of a substance. It is important that chemical substances are as pure as possible. This reduces the chances of unnecessary side-effects and helps ensure an accurate dose in each tablet/substance. The purity of a substance or compound can be established by using data from its melting point or boiling point and from thin layer chromatography. Impure compounds have a range of melting and boiling points, as
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Subject Chemistry Paper No and Title 15. Bioinorganic Chemistry Module No and Title 35. Molybdenum nitrogenase Module Tag TABLE OF CONTENTS 1. Learning Outcomes 2. Introduction 3. Fe protein 4. MoFe-protein 4.1 MoFe-cofactor 4.2 Role of Mo 4.2 P cluster 5. Summary 1. Learning Outcomes After studying this module, you shall be able to • Identify the roles of the Fe protein and MgATP hydrolysis. • Learn the roles of the two metal clusters contained in the MoFe protein in catalysis • Gain
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Suppression is a technique that plays an integral role in ion exchange chromatography as well as conductivity detection. It is commonly used in the detection and analysis of molecules such as ions as well as organic acids. There are numerous factors behind its popularity and effectiveness. These factors includes its ability to decrease background conductivity of the eluent which aids in the accuracy of result, minimizing of baseline noises which enables smoother analyses, optimization of signal to
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material of choice by determining the heat of combustion. Fully understanding calorimetry is a very important skill to have whilst analyzing fuels. Calorimetry can be defined as the process of measuring how much heat is released or absorbed in a chemical reaction. The students will be dealing with an endothermic reaction, a reaction taking in heat rather then letting off heat. Calorimetry will be useful when analyzing fuels because the students will be able to collect data on however much heat is
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ABSTRACT The resistivity is a very important property to consider in a drilling fluid. The measurement of resistivity gives us adequate information to know on the concentration of soluble salts. Resistivity is measured by placing the sample in a resistive container having two electrodes spaced so that electrical current can flow through the sample. The main aim of this experiment is to determine the resistivity of the mud sample, the effect of the additives on the mud and then take the measurement
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