Thermochem QQ Trade Flashcards
What is stored energy called?
POTENTIAL ENERGY
The capacity to do work or supply heat is called?
ENERGY
What is the energy of motion?
KINETIC ENERGY
What is the study of the energy changes that accompany physical or chemical changes in matter?
THERMOCHEMISTRY
What is the name of stored energy in which the chemical bonds of molecules act as the “storage” medium
CHEMICAL ENERGY
What is the law that says that energy can neither be created or destroyed.
LAW OF CONSERVATION OF ENERGY
What is the measure of the average kinetic energy of the particles in a sample of matter?
TEMPERATURE
What is the amount of energy transferred between substances called?
HEAT
Well-defined part of the universe singled out for study, i.e. reactants is called?
SYSTEM
What is the term used for the remainder of the universe. i.e. everything else other than reactant?
SURRONDINGS
What is the name of system that energy, but not matter, can be exchanged with the surroundings.
CLOSED SYSTEM
Both energy and matter can flow into or out of this system.
OPEN SYSTEM
In an __________(ideal system) neither matter nor energy can move in or out.
ISOLATED SYSTEM
Type of reaction when heat is transferred from surrounding to system.
ENDOTHERMIC
Q>0 for an ______________ process
ENDOTHERMIC
When heat is transferred from system to surroundings. Process is called_________?
EXOTHERMIC
Q < 0 for an ______________ process
EXOTHERMIC
Heat change, ∆H is called_________?
ENTHALPY
What type of reaction has the enthalpy written in the equation on the right side?
EXOTHERMIC
It is a ____________ reaction when the ∆H is written on the left in the equation?
ENDOTHERMIC
On an enthalpy diagram, it is an _______ reaction when the products have a greater energy than the reactants.
ENDOTHERMIC
In an exothermic reaction the enthalpy diagram would have the ________ having a greater energy than the ____________
REACTANTS, PRODUCTS
What happens to the ∆H when you reverse a reaction?
THE SIGN CHANGES
What happens to the value of the ∆H if the number of moles of the reaction is halved?
∆H IS HALVED
The __________is the amount of heat required to raise the temperature of the system by 1ºC or 1 K.
HEAT CAPACITY
What is the amount of heat required to raise one gram of the substance by 1ºC or 1 K?
SPECIFIC HEAT CAPACITY
What is the equation for specific heat capacity, with units?
C= Q/m∆T
C= J/ºCg, m = grams, T in ºC
Name of equipment that measures the amount of heat transferred during a reaction.
CALORIMETER
What equation is used when a calorimeter is used to determine enthalpy of reaction?
Qsol = msol x Cwater x ∆T
If the temperature increase that means the solution________ and therefore the reaction is ___________?
ABSORBS HEAT, EXOTHERMIC
When the temperature _________ the solution therefore ________ and the reaction is endothermic.
DECREASE, RELEASES HEAT
What are the assumptions for doing enthalpy of reaction?
VOLUME OF SOLUTION (mL) = MASS OF SOLUTION, C IS FOR WATER
What are the two equations that link Qsol to ∆H?
Qsol= - Qrxn
∆H = Qrxn/ n
What is the law that states ∆H is independent of the path taken?
HESS’ LAW
What is the amount of energy gained or lost when
1 mole of the substance is formed from its elements under standard conditions?
HEAT OF FORMATION
_____________ of a substance is the heat liberated when 1 mole of the substance undergoes complete combustion.
HEAT OF COMBUSTION
∆Hfº of an element in its standard state is always __________
ZERO
What is the equation for finding heat of reaction using ∆Hf?
∑∆ Hºf(products) - ∑∆Hºf(reactants)
