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Test # 2 Part 2

Chapter16 :P Joy

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
Created by: 1531900713