Chapter 15 - Enthalpy and Hess's law Flashcards
What does bond energy mean?
The energy required to break a particular chemical bond.
What is the reactivity of a compound?
The measure of how easily the compound undergoes chemical reaction when it is mixed with other substances.
What is the standard enthalpy change for a reaction?
The enthalpy change when the reaction occurs with all reactants and products present in their standard states.
What is the stability of a compound?
A measure of how difficult it is to decompose the compound in the absence of other substances.
What is photosynthesis?
The process in which plants use solar energy to convert carbon dixoide from the air and water from the ground into the carbohydrate, glucose.
What is Hess’s law?
For a chemical reaction the enthalpy change in going from reactants to products is constant, regardless of what particular set of reaction steps is used to bring it about.
What is the standard enthalpy of formation?
The increase in enthalpy when one mole of the compound in its standard state is formed from its elements in their standard states.
What is heat of atomisation?
The enthalpy change for the production of gaseous atoms from the element in its standard state at a pressure of 100.00 kPa and at the temperature in question.
What is the chemical equation photosythesis?
6CO2(g)+6H2O(l)–>C6H12O6(aq)+6O2(g)
What type of reaction is photosynthesis?
An endothermic reaction.
What is the relationship between photosynthesis and respiration?
They are opposites.
What is repiration?
The process in which living matter generates the energy required for its normal functioning by converting glucose and related carbohydrates to carbon dioxide and water.
What type of reaction is respiration?
Exothermic.
What is the chemical equation of respiration?
C6H12O6(aq)+6O2(g)__>6CO2(g)=6H2O(l)
