Lab #4: Aqueous Reactions Introduction: In this experiment we studied the two different types of aqueous chemical reactions‚ double replacement and single replacement. In a double replacement reaction one or both of the products is an insoluble ionic compound or otherwise known as a precipitate; or a non-electrolyte; or a gas. In a single replacement reaction there is typically a metal and an ionic compound consisting of a metal cation and a non-meatl anion. Singel replacement ractions occur when
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Coupled Reactions Louella Rose E. Tan‚ Frances May L. Coralde Institute of Chemistry‚ University of the Philippines‚ Diliman‚ Quezon City 1101 Philippines Results and Discussion A combustion reaction is a reaction that liberates heat and light. Magnesium is a stable element and reacts violently with evolution of much heat and light. The reason the magnesium burned in carbon dioxide was because it combined with the oxygen in the CO2 leaving elemental carbon behind. CO2(g) C(S) + O2(g)
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and unnecessary influence on African countries. Many powerful countries like Great Britain‚ France‚ and Germany intentionally impede in the development of Africa. They justify their involvement by claiming to have humanitarian motives‚ but in reality‚ they have a hidden agenda to satiate their power-hungry and selfish desires like during colonialism. Evidently‚ there are many harmful consequences of foreign aid. The corruption that stems from foreign aid harms the African countries in terms of their
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rate of reaction (mol dm-3 s-1) for the following chemical reaction: CaCO3(s) + HCl(aq) CaCl2(s) + H2O(l) + CO2(g) Research question: How does altering concentration (mol dm-3) of hydrochloric acid (HCl) affect the rate of reaction (g/s) for the following reaction: CaCO3(s) + HCl(aq) CaCl2(s) + H2O(l) + CO2(g) Background information: The reaction between calcium carbonate and hydrochloric acid is an example of a neutralization reaction between an acid and a base. Neutralization reactions involve
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Colonialism is not just a thing of the past‚ and those who recognize its presence will fight hard against it. For as Franz Fanon put it in his book titled The Wretched of the Earth‚ “The need for this change exists in its crude state‚ impetuous and compelling‚ in the consciousness and in the lives of the men and women who are colonized” (35-36). The need for change that Fanon refers to is common in many forms of Indigenous expression: in song‚ dance‚ art‚ and storytelling. The focus of this essay
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WHAT IS DEMOCRACY? WHAT ARE THE BARRIERS TO THE DEMOCRATISATION OF COUNTRIES IN SUB SAHARAN AFRICA. As a prologue this paper poses two fundamental and pertinent questions: Is there any form of democracy in Africa? Are there model democracies in the industrialized countries today that can be used as standard measures? These‚ indeed‚ are very pertinent questions to Africans. They are especially important as they come at a time when there is a dramatic shift towards a new international order that
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Chemical Reactions What is a Chemical Reaction? Types of Chemical Reactions Redox Reactions Nonredox Reactions Classifying Reactions What is a Chemical Reaction? A chemical reaction is a process in which the identity of at least one substance changes. A chemical equation represents the total chemical change that occurs in a chemical reaction using symbols and chemical formulas for the substances involved. Reactants are the substances that are changed and products are the substances that are
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Neocolonialism: Exploitation of Africa Throughout the history of man‚ Africa has played an important part in the development of the world‚ through political‚ economic and social means. Recently‚ Africa and its people have been used more as a tool for other parts of the world for the development of their industries and economies. The recent trajectory of events has begun a period of Neocolonialism in Africa‚ in which the outside world has been scrutinized by Africans as exploiters of their land
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Chapter 1 Chemical Reactions and Equations Q.1. Why should magnesium ribbon be cleaned before burning in air ? Ans: Magnesium ribbon is a very reactive metal. When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly. Q.2. Write the balanced
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RATE OF REACTIONS. The reaction rate (rate of reaction) or speed of reaction for a reactant or product in a particular reaction is intuitively defined as how fast or slow a reaction takes place. For example‚ the oxidative rusting of iron under the atmosphere is a slow reaction that can take many years‚ but the combustion of cellulose in a fire is a reaction that takes place in fractions of a second (right). Chemical kinetics is the part of physical chemistry that studies reaction rates. The concepts
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