Usman Omid Chemistry IB 1A Enthalpy Of Solution _Introduction_ AIM The aim of this investigation was to determine the enthalpy of the solution created when dissolving Sodium Hydroxide (NaOH) in water (H2O). THEORY When a solid ionic compound is dissolved in water a change of enthalpy is involved. _The enthalpy of a solution_‚ ΔHsol is the enthalpy change when one mole of the substance is dissolved in water to form aqueous solution. � CHEMICAL Sodium Hydroxide (NaOH) PROCEDURE The recommended
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Student: Mary Chrisin L. ObreroDate: October 7‚ 2014 Section: 116 Behavior of Gases and Determination of Absolute Zero Experiments 4&5 Introduction: First of all‚ the Boyle’s law (pressure-volume law) indicates that the volume of a certain amount of gas given held at a constant temperature differentiates inversely with the applied pressure when there are constant temperature and mass. Equations: PV=C. When pressure goes up‚ volume goes down (derived from the equation above): P1V1 = P2V2 =
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it the distances between the intervals are equal and there is an absolute zero point. 4. Which level of measurement‚ interval or ratio has a zero that does not indicate an absence of the concept. Give examples of two variables that could have a zero‚ but the concept would not be absent (this can be any variable you select‚ not necessarily a variable that was used in the study). a. Interval ratio is an example of this that has a zero that does not indicate and absence of the concept. i. Two examples:
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Experiment to determine absolute zero using Charles’s law In this experiment you will be determining the specific heat capacity of oil using an electrical method. You will need to ensure that your write up contains the following: • Clear method (bullet points are ok) and labelled diagram include what is to be repeated and averaged. • State independent/dependent and control variable(s) • State what is to be varied and how (include range and intervals)? • What is to be measured and what with
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Specific Heat of a Metal Post-Lab I. Purpose The purpose of this lab is to determine the specific heat of an unknown metal. II. Safety Wear goggles and lab apron at all times. Use caution when boiling water. Do not pick up hot beaker or hot metal with hands. Use tongs. III. Pre-Lab Questions 1. A 12.5 g metal is raised to 100C in boiling water. It is put into 82.8 g of water at 22.4C‚ and the water rises to 28.6C. Recalling that the specific heat of water is 4.18J/gC‚ use the equation above
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------------------------------------------------- Fire Fire is the rapid oxidation of a material in the exothermic chemical process of combustion‚ releasing heat‚ light‚ and various reaction products.[1] Slower oxidative processes like rustingor digestion are not included by this definition. The flame is the visible portion of the fire. If hot enough‚ the gases may become ionized to produce plasma.[2] Depending on the substances alight‚ and any impurities outside‚ the colorof the flame and the
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SUPPLEMENTARY MATERIAL I Unit V: States of Matter 5.7 KINETIC ENERGY AND MOLECULAR SPEEDS Molecules of gases remain in continuous motion. While moving they collide with each other and with the walls of the container. This results in change of their speed and redistribution of energy. So the speed and energy of all the molecules of the gas at any instant are not the same. Thus‚ we can obtain only average value of speed of molecules. If there are n number of molecules in a sample and their individual
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-273.15 is the temperature in degree Celsius that corresponds to the value of absolute zero or 0K on the kelvin scale. The kelvin scale is a thermodynamic temperature scale has the same increment or magnitude as one degree Celsius however its null point is at absolute zero. At absolute zero temperature‚ all molecular movement stops‚ however all actual temperatures are above the absolute zero temperature. The Kelvin scale is named after Lord Kelvin‚ (William Thompson)‚ a British inventor born in
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electrons begins‚ it essentially goes on forever‚ making it an important material to humans. Superconductivity was discovered by a Dutch scientist by the name of Heike Kamerlingh Onnes in 1911. While researching properties of materials at absolute zero‚ this man found out that certain materials lost its resistance to the flow of electrons. For years to come‚ his discovery was at the head of theoretical interest. The only problem though‚ was that people at that time could not even think of a way
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Kelvin (K). The Kelvin scale for Cryogenics goes from 173 K to a fraction of a Kelvin above absolute zero. There are also two main sciences used in cryogenics‚ and they are Superconductivity and Superfluidity. Cryogenics first came about in 1877‚ when a Swiss Physicist named Rasul Pictet and a French Engineer named Louis P. Cailletet liquefied oxygen for the first time. Cailletet created liquid oxygen in his lab using a process known as adiabatic expansion‚ which is a "thermodynamic process in which
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