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Test # 2 Part 2
Chapter16 :P Joy
| Question | Answer |
|---|---|
| Thermochemistry | is the study of the transfers of energy as heat that accompany chemical reactions and physical changes |
| Calorimeter | the energy absorbed or released as heat in a chemical or physical change is measured in a calorimeter. |
| Temperature | is a measure of the average kinetic energy of the particles in a sample of matter |
| The ______ the _____ energy of the particles in a sample, the higher the temperature feels. | greater, kinetic |
| Celsius and Kelvin Temperatures are related by the following equation | K = 273.15 + °C |
| A ________ is the SI unit of heat as well as all other forms of energy | joule |
| The joule is derived from the units for force and length in what equation? | N x m = kg (m^2) / s^2 |
| Heat | the energy transferred between samples of matter because of a difference in their temperatures |
| Specific Heat | is the amount of energy required to raise the temperature of one gram of a substance by one Celsius degree (1°C) or one kelvin ( 1 K). |
| Cp represents what? | Specific Heat |
| q stands for? | the energy lost or gained |
| m stands for? | mass |
| ΔT stands for | the difference between the initial and final temperatures |
| To find the Cp you need what equation? | q / m x ΔT |
| to find q what equation is most useful? | q = cp x m x ΔT |
| What is the Cp of water? | 4.18 J/g(K) |
| The energy absorbed by heat during chemical reaction at constant pressure is called | enthalpy |
| Enthalpy is represented by ? | ΔH |
| Enthalpy Change | the amount of energy absorbed by a system as heat during a process at constant pressure |
| What equation represents Enthalpy change? | ΔH= H products- H reactants |
| Enthalpy of reaction | the quantity of energy transferred as heat during a chemical reaction |
| Because energy is released the reaction is.... | exothermic |
| Because the energy is absorbed and the products have a larger enthalpy than the reactants they are.. | endothermic |
| Thermochemical equation | an equation that includes the quantity of energy released or absorbed as heat during the reaction as written |
| In an exothermic chemical reaction, the enthalphy change is ____meaning energy is released from the system as heat. | negative |
| In an endothermic chemical reaction, the enthalpy change is ______ because energy is absorbed into the system as heat | positive |
| The physical states of reactants and products must always be included in thermochemical equations because... | they influence the overall amount of energy as heat gained or lost |
| In endothermic reactions ΔH is always | positive |
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