Energetics Flashcards
Enthalpy change is measured in…
kJmol-1
In an exothermic reaction is more energy given out or taken in?
given out
In an exothermic reaction does the temperature increase or decrease?
Temperature increases
In an exothermic reaction do the product have more or less energy than the reactants?
Less
Do exothermic reactions have a positive or negative enthalpy change?
Negative
In an endothermic reaction is more energy given out or taken in?
Taken in
In an endothermic reaction does the temperature increase or decrease?
Temperature decreases
In an endothermic reaction do the product have more or less energy than the reactants?
More
Do endothermic reactions have a positive or negative enthalpy change?
Positive
What are bond enthalpies?
The energy needed to break a bond
Is breaking bonds exothermic or endothermic?
Endothermic
Is forming bonds exothermic or endothermic?
Exothermic
Define standard enthalpy change of formation
The enthalpy change when one mole of compound is formed from its elements in their standard states under standard conditions
Defined standard enthalpy change of combustion
The enthalpy change when one mole of a fuel is completely burned in oxygen under standard conditions with all reactants and products in their standard states
Defines standard enthalpy change of reaction
The enthalpy change when a reaction occurs with reactants and products in their standard state and in molar quantities under standard conditions
