6.1 & 6.2
An endothermic process ____________ heat?
Enthalpy is represented by what symbol?
ΔH
required
formed
Sublimation is when:
a solid turns directly into a gas.
ΔE represents a change in a systems's
Kinetic energy is calculated by
KE = ½ mv2
What does a positive q value represent?
An endothermic reaction. Heat entering the system
In ΔHo , the o symbol indicates values measured in
the standard state/conditions
exothermic processes
release heat to the surroundings
If ΔE < 0, the process is _________________ and _______________ energy.
exothermic and releases energy
ΔHvaporization is the energy needed to
turn a substance in the liquid phase into the gaseous phase or vice versa.
An exothermic reaction/A system "loosing" energy is represented by a positive or negative q?
Negative
The standard conditions are
1 mol, 25 ℃ or 298 K and 1.00 atm
internal energy
When w is positive, that means work was done __________________.
on the system
The amount of energy required to raise the temperature of a substance by 1 K (1 degree Celsius) is its
heat capacity
Heat transfers from ____ to ____ objects.
Hot, Cold
Hess's Law states...?
The change of enthalpy of a reaction is the same regardless of how many steps the reaction occurs.
bond enthalpy
The internal energy of a system can be changed by the flow of __________ or __________.
work (w) or heat (q)
ΔH for a reaction can be calculated by the equation
q = mcΔT
This state of matter generally has the highest potential energy.
gas
To find the overall heat of formation, the equation involves the heat of formations of the ____ - the ____.
Products, Reactants
The first law of thermodynamics states that energy
cannot be created or destroyed, only transformed.