The Enthalpy Change of the Decomposition of Calcium Carbonate _INTRODUCTION_ RESEARCH QUESTION: What is the enthalpy change of the decomposition of calcium carbonate? BACKGROUND: Enthalpy in chemistry can be thought of as the energy contained within the bonds‚ or the internal energy‚ but it is not heat and you can only measure changes in it. When bond bonds break in the reactants energy is given off‚ when bonds form‚ energy is absorbed. If the energy absorbed is less than the energy released
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Thermodynamics – Enthalpy of Reaction and Hess’s Law I. Purpose The purpose of this lab is to verify Hess’s Law through the three reactions of NaOH and HCl‚ NH4Cl and NaOH‚ and NH3 and HCl. The sum of the enthalpies of the first two reactions should equal the enthalpy of the third reaction. II. Background Hess’s Law is used to determine the enthalpy of a reaction from adding two or more preceding reactions. To determine the enthalpies of certain chemical reactions‚ the change in must
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runs 161 m south‚ so that the magnitude of the ostrich’s resultant displacement is 226 m. Calculate the magnitude of the ostrich’s eastward component and its running speed to the east. 1. Kangaroos can easily jump as far as 8.0 m. If a kangaroo makes five such jumps westward‚ how many jumps must it make northward to have a northwest displacement with magnitude of 68 m? What is the angle of the resultant displacement with respect to north? 2. In 1926‚ Gertrude Ederle of the
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A total hip joint replacement usually composed of two main components articulating with one another‚ a polymeric acetabular cup against a metal or ceramic femoral head component [1]. Ultra-high molecular weight polyethylene (UHMWPE) is a key player in the total hip joint replacement as an acetabular cup since more than half a century‚ due to their unique properties such as high wear resistance‚ strength and modulus‚ excellent toughness‚ chemical resistance and impact‚ low moisture absorption‚ good
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Structural Effects on Stability and Reactivity. Organic Chemstry Laboratory Structural Effects on Stability and Reactivity Introduction The concepts of stability and reactivity are fundamental to understanding chemistry. In this chapter we consider first the thermodynamic definition of chemical stability. We then consider chemical kinetics (Section 3.2) and how it can provide information about reactivity. We also explore how structure influences stability and reactivity. We want to learn how to make
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formation‚ displacement‚ and sublimation. Listed are the defense mechanisms used by the ego to avoid recognizing ideas that cause anxiety‚ and can be considered‚ negative coping strategies for stress. J.K. Rowling stated‚ “According to Madam Pomfrey‚ thoughts could leave deeper scars than almost anything else.” Sigmund Freud would support this statement‚ dissecting the true impact thoughts can leave on a person using his found defense mechanisms. One Freudian defense mechanism‚ known as displacement‚ is
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Fourier series From Wikipedia‚ the free encyclopedia Fourier transforms Continuous Fourier transform Fourier series Discrete-time Fourier transform Discrete Fourier transform Fourier analysis Related transforms The first four partial sums of the Fourier series for a square wave In mathematics‚ a Fourier series (English pronunciation: /ˈfɔərieɪ/) decomposes periodic functions or periodic signals into the sum of a (possibly infinite) set of simple oscillating functions‚ namely sines and
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Muhammed Sabah Comparing Reactivity Of Alkanes and Alkenes Aim: To compare the reactivity of an alkane and an alkene Hypothesis: The cyclohexene would react to the bromine water and turn colourless‚ whilst the cyclohexane won’t react. Risk Assessment: What’s the problem? | How do you fix? | How does it work? | Bromine water is corrosive to the skin | Wear gloves | Stops the Bromine water from reaching skin | Cyclohexane/ene is highly flammable | Keep away from naked flames. | No naked
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Measuring the enthalpy change of vaporisation of water You should attempt this part of the activity even if you have not seen the demonstration of the practical. 1. Calculate a value for ∆Hvap for water in KJ mol-1 using the data from the demonstration. Also‚ calculate ∆Hvap from the following data gathered by a student; 8100 J were needed to distil 2.95g of water. a) Explain why the boiling tube was surrounded with expanded polystyrene (or other similar insulation)‚ but the condenser was left
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TIME SERIES ANALYSIS Chapter Three Univariate Time Series Models Chapter Three Univariate time series models c WISE 1 3.1 Preliminaries We denote the univariate time series of interest as yt. • yt is observed for t = 1‚ 2‚ . . . ‚ T ; • y0‚ y−1‚ . . . ‚ y1−p are available; • Ωt−1 the history or information set at time t − 1. Call such a sequence of random variables a time series. Chapter Three Univariate time series models c WISE 2 Martingales Let {yt} denote
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