Energy Conversions. Energy. the ability to do work or produce heat. energy energy due to composition or position of an object
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1 Energy Energy the ability to do work or produce heat energy energy due to composition or position of an object energy the energy of motion Energy - SI unit for energy 1 J = 1 Kgm 2 / s 2 Energy Conversions Convert 15,500 joules into Calories amount of energy required to raise 1 g of water 1 C 1 cal = 4.18 J 1000 calories = 1 Kilocalorie = 1 Calorie 1
2 Formulas Kinetic Energy Formulas Potential Energy KE = ½ mv 2 KE = kinetic energy (joules) m = mass (must be in Kg) V = velocity (must be in m/s) PE = mgh PE = Potential Energy (J) m = mass (Kg) g = gravitational constant = 9.8 m/s 2 h = height (m) Formulas - Work the energy used to move an object against a force a push or pull on an object Examples A bowler lifts a 5.4 kg bowling ball 1.6m and then drops it to the ground. How much work was required to raise the ball? W = mgd = fd = PE 2
3 Examples How much potential energy does that ball have at this height? Examples If the ball is dropped and we assume that all of the potential energy is turned into kinetic energy, at what velocity will the bowling ball hit the ground? More examples What is the kinetic energy of 1 atom of Ar moving at 650 m/s? 1 st Law of Thermodynamics 1 st Law of Thermodynamics energy is conserved 3
4 ΔE Thermochemistry ΔE has 3 parts: 1. A # indicating the magnitude 2. A sign (+/-) indicating the direction 3. A unit - study of heat changes that accompany chemical reactions and phase changes. Relating ΔE to heat & work The system can exchange energy with its surroundings in 2 ways: as heat or work ΔE = q + w ΔE = change in energy q = heat w = work q & w Don t forget q & w must have signs In order to get the sign you must look at the system as a box and the surroundings as everything else System Surroundings 4
5 q & w Anything going INTO the box will be + Anything going OUT of the box will be Examples A system absorbs 140 J of heat from the surroundings and does 85 J of work on the surroundings. Calculate ΔE. + - Endothermic & Exothermic system absorbs heat Heat flows into the system Temperature goes down Heat flows out of the system and into the surroundings Temperature goes up Only look at heat (q) to determine if the system is endo or exo Specific Heat the amount of heat required to raise the temperature of 1 g of a substance 1 C The units for specific heat are The specific heat of water (in a liquid form is 4.18 J/g C) All substances have a particular specific heat 5
6 Specific heat equation q = mcδt q = heat gained or lost (J) m = mass (grams) note that this is different than the energy calculations c = specific heat (J/g C) ΔT = change in temperature ( C) = T f -T i Specific heat calculations How much heat is required to raise 250 g of water from 22 C to 98 C? Specific heat calculations A piece of metal with a mass of 4.68 g absorbs 256 J of heat when its temperature is increased by 182 C. What is its specific heat? Specific heat calculations 60.0 J of heat are applied to a 5.00 g sample of calcium (c = 0.647J/g C). If the final temperature is 51.1 C, calculate the original temperature. 6
7 Calorimetry - insulated device used for measuring the amount of heat absorbed or released during a chemical or physical process. Calorimetry When using calorimetry, you are usually trying to determine the identity of an unknown metal by finding its specific heat The heat lost from the metal will be gained by the water -q metal = q water - q metal = q water Calorimetry - (m metal )(c metal )(ΔT metal ) = (m water )(c water )(ΔT water ) Calorimetry Examples A 58.0 g sample of a metal at C is placed in a calorimeter containing 60.0 g of water at 18.0 C. The temperature of that water increases to 22.0 C. Calculate the specific heat of the metal. 7
8 Calorimetry Examples A piece of metal with a mass of 4.68 g at 135 C is placed in a calorimeter with 25.0 g of water at 20.0 C. The temperature rises to 35.0 C. What is the specific heat of the metal? More calorimetry 3.25 g Mg is placed into 125 ml of HCl. The initial temperature of the calorimeter is 18.5 C & the final temperature is 26.6 C. If the heat capacity of the calorimeter is 4.86 J/g C, calculate the enthalpy of the reaction. 8
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