Chemical Reactions and their Classifications 26 October 2012 Abstract: Ordinary laboratory ware was used to determine how many of what type of chemical reactions occurred. This yielded three decomposition reactions‚ four substitution reactions‚ and three metathesis reactions. Introduction There are many different types of chemical reactions in the study of chemistry; A composition reaction (also known as synthesis) is defined as the reaction that occurs when two single compounds combine in
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Most people might believe that putting mentos in diet coke is a chemical change‚ but it is actually a physical change. This is because the pieces that caused the reaction are still there‚ but they have just been rearranged. This also means that changing some of the factors in this experiment might cause another physical reaction to occur on a smaller or even larger scale.(Science Buddies) What you see when mentos are put into diet coke is that the coke spews out of it’s container once contacted
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Chemical Formula Principles Chemical Formula is a system of chemical notation that was invented in 181 by John Jakob Berzelius. The system is based on the law of definite proportions”‚ states that all samples of a given chemical compound have the same elemental composition. It is also a way of expressing information about the proportions of atoms that constitute a particular chemical compound‚ using a single line of chemical element symbols‚ numbers‚ and sometimes also other symbols‚ such as
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PRESENTATION HCL Enterprise Alagu Sundarraj S (11AD02) Industry Profile: Company profile: HCL Enterprise is a garage startup founded in the year 1976. It started as Microcomp and used brand name Televista for selling calculators. Shiv Nadar along with his ex DCM employees Ajai Chowdhry‚ Arjun Malhotra‚ Subhash Arora‚ Yogesh Vaidya‚ S. Raman‚ Mahendra Pratap and DS Puri started the enterprising venture. Group Companies: HCL AXON HCL Technologies HCL Info systems HCL Security
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Lab 8 - Chemical and Physical Processes of Digestion (p.105) Introduction: In this lab‚ I will study how digestion of carbohydrates‚ proteins‚ and fats occurs. I will define Key Terms that describe what will occur in the experiments; I will conduct an experiment for each Activity and provide all resulting Data as well as answer Questions from each Activity. I will then provide a short Summary for what I learned in each Activity. Key Terms: Enzymes (p. 105) – Speed up chemical
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The hypothesis If a chemical reaction occurs‚ then there will be indicators of a chemical change‚ was supported throughout this experiment. Throughout this experiment there were several reactions that took place‚ and an indicator of such chemical reactions could be seen throughout each one. The first piece of identifiable evidence was present in the first step‚ which was when copper (II) nitrate and sodium hydroxide were combined. When stirred‚ a blue precipitate formed at the bottom of the test
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can quickly change between the different forms of H2O by either increasing or decreasing temperature. We have worked with hot plates and thermometers in other labs before‚ so we know how to be safe. I wonder what a graph of the changing temperatures over time between the phases would look like. Hypothesis Based on prior learning‚ I predict that the graph of the water phase changes will not be one straight slope‚ but instead will plateau‚ or be flat‚ and then slope between the change of ice to
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Alloy - An alloy is a substance made by melting two or more elements together‚ at least one of them a metal. An Example: Examples of alloys include brass‚ bronze‚ 14k gold‚ and sterling silver. covalent bond - A covalent bond is a chemical link between two atoms in which electrons are shared between them. An Example: There is covalent between the oxygen and each hydrogen in (H 2 O). Each of the bonds contains two electrons - one from a hydrogen atom and one from the oxygen atom. Both atoms
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Chemical Equilibrium: Le Chatelier Principle By Sarah Ramos and Kristina Todorovic Chemistry 203 DEN Dr. Mohamed El-Maazawi Part A. Acid-Base Indicators Purpose In this part of the experiment‚ we will find a reagent that will shift the acid-base equilibrium reaction described by Equation (2) in one direction and then a second reagent that will cause the equilibrium position to shift back in the opposite direction. Introduction An acid–base indicator
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term ‘physical change’ A physical change is where the appearance or traits of the substance/item change these changes can be‚ change of size‚ shape‚ color‚ volume and state. The molecules in the substance can be rearranged but their composition must stay the same. No new substance can be formed. They can be reversed most of the time. 2. Describe one example of a physical change in everyday life and explain why it is a physical change. Melting an ice cube is a common physical change. Melting an ice
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