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Chemistry

Heat in Chemical Reactions

QuestionAnswer
In a chemical equation, what does a system consist of? the reactants
In a chemical reaction, what do the surroundings consist of? the products
What is internal energy? the sum of all the kinetic and potential energy in a system.
When do chemical bonds release energy? while the bonds are forming
When do chemical bonds require energy? while the bonds are being broken
What does "q" stand for? heat
What does "w" stand for? work
What does "ΔE" stand for? energy change
What occurs during an endothermic reaction? energy is gained/absorbed
What occurs during an exothermic reaction? energy is lost/released
What is the one thing a State Function depends on? the state of the substance
Enthalpy (H) heat content of a system at constant pressure (value very close to energy)
What does "ΔH" stand for? Enthalpy Change
what is the equation for ΔH? ΔH = Hproducts - Hreactants
What is the standard state of a substance? 1 atmosphere 25°C
What does "ΔH°" stand for? Standard ΔH
What is Hess's Law used for? to indirectly determine the enthalpy change of a reaction
What is Calorimetry? the study of heat flow or movement of heat (temp. change)
What does Calorimetry measure? the amount of heat released or absorbed during a chemical reaction
What is Heat Capacity? the amount of energy(heat) needed to raise the temperature of a substance 1°C
What is Specific Heat? the amount of energy(heat) needed to raise the temperature of 1g of a substance 1°C
How are "qrxn" and "qsur" related? when qrxn is negative(-qrxn), qsur is positive(qsur) and vice versa
What is the equation to find heat of the surroundings in a chemical reaction? qsur = m x C x (Ti - Tf)
What does "C" stand for? the specific heat of H2O (1 calorie or 4.184 Joules)
How do you calculate "ΔH"? ΔH = qrxn / 1 mol
What is the standard state of an element? The most stable form the element under standard conditions
Created by: gingersam
 

 



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