409 Lab 40: Calorimetry Calorimetry is the measurement of the quantity of heat exchanged during chemical reactions or physical changes. For example‚ if the energy from an exothermic chemical reaction is absorbed in a container of water‚ the change in temperature of the water provides a measure of the amount of heat added. Calorimetry involves the use of a calorimeter. In this activity you will learn how the energy change in a physical change can be measured using a calorimeter. •
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Calorimetry Lab: Determining the Unknown Metal Purpose: To determine the identity of an unknown metal Hypothesis: The unknown metal is Copper Materials: * Safety glasses * Styrofoam cup * Thread or string * Glass rod * Thermometer * 100mL graduated cylinder * Hot plate * Balance * Unknown metal * 300mL beaker Procedure: i. Mass of metal was recorded ii. Water was heated on a hot plate in beaker iii. Temperature was recorded when water reached
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First‚ the buffer was prepared by using the formula as follows: Figure 1: Calculation for prepare 0.1 M potassium phosphate buffer at pH 6 3.4007g of potassium phosphate was weighed and placed in 300 mL beaker. Then‚ 125 mL of water was added into the beaker that contained potassium phosphate. The mixture was dissolved using the stirring rod‚ and then the magnetic stirring bar was placed in the beaker for further dissolve when measuring the pH. The pH meter was used to measure the solution
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Calorimetry Chemistry 1412 Spring 2013 Objective: Determine the calorimeter constants in a coffee cup calorimeter‚ then the calorimeter will used to determine the quantity of heat that flows in a few physical and chemical processes. Materials used: Choice I: Choice II: * Safety Goggles Safety Goggles * Distilled water Distilled water * 150 mL beaker 600 mL beaker * 50 mL graduated cylinder 50 ml graduated cylinder * Calorimeter Calorimeter
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First hand investigation of the Dissolution of Solutes Background Information Molar heat of solution * The molar heat of solution of a substance is the heat absorbed when one mole of the substance dissolves in a large excess of water. It is expressed in kJ/mol. * The specific heat of water is a constant‚ with a value of 4.18 J/ g*oC. AIM: To determine the molar heat of solution for two different solids Equipment: * A calorimeter (made using 2 Styrofoam cups with a cardboard lid)
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Determining the Specific Heat of an Unknown Metal Objective: To determine the specific heat of an unknown metal through the use of a calorimeter. Background: The specific heat of any substance represents the quantity of heat energy in joules required to heat one gram of the substances by one °C. The specific heat of a substance is dependent upon the temperature; this means that there is a temperature range for which the specific heat of a substance applies. For metals and metallic substances
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In this lab‚ we will measure the heat of combustion‚ or calorimetry‚ of a candle and compare the found quantity with known values for other hydrocarbons. The calorific value is the total thermal energy released when a substance goes through complete combustion with oxygen. In order to achieve the purpose of this lab‚ we must first determine the mass of the tea candle. Then‚ we will determine our room temperature‚ measure about 100 mL of chilled water‚ and then pour the water into the given empty
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CHEMISTRY IA: Processing CALORIMETRY QUANTITATIVE DATA TAKEN (07.05.14 and 21.15.14) Initial Pringle Mass H20 Amount Final Pringle Mass Δ Pringle Mass Initial H2O Temp (± 0.5°C) Max H2O Temp (± 0.5°C) Δ H2O Temp (± 0.5°C) SAMPLE 1 10g 225mL 1.85g 10g-1.85g=8.85g 22.3°C 59.8°C 37.5°C SAMPLE 2 10g 225mL 0.95g 10g-0.95g=9.05g 21°C 61.1°C 40.1°C SAMPLE 3 10g 225mL 1.95g 10g-1.95g=8.05g 23°C 58°C 35°C SAMPLE 4 10g 225mL 1.85g 10g-1.85g=8.15g 50.5°C 83°C
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Specific Heat Lab Objective: Find the specific heat of the unknown metal given using calorimetry. Background Theory: In every reaction‚ energy is transferred between a system and its environment. A system encompasses the substances that are involved in a reaction‚ and everything else in the universe other than the system is called the environment. The standard SI unit of energy is Joules (J). Temperature is the level of excitement of the atoms in a substance. In most cases‚ energy is
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Thermodynamics/Calorimetry Introduction: Thermochemistry investigates the relationship between chemical reactions and energy changes involving heat. The amount of heat generated or absorbed in a chemical reaction can be studied using a calorimeter. Purpose: The purpose of this laboratory was to determine the heat capacity of the calorimeter‚ and to understand thermodynamics/calorimetry by applying the calorimetry equation‚ Heat lost=Heat gained. We will use calorimetry to determine
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