6.1 the nature of chemical energy Flashcards
E of the universe is
constant
E can be converted from
one form to another
define temperature
a property that reflects the random motions ofthe particles in a particular subject
the value of a state function does not depend on
how the system arrived at the current state
of work, energy and heat, which are state fn and which are not?
E is a state fn
w and q are not
in an exothermic reaction, some of the potential E stored in chemical bonds is converted to
thermal E (random KE) via heat
in an exothermic rxn, the E gained by the surroundings must be
equal to the E lost by the system
if a systems reactants have more PE than the products, the rxn will be
exothermic
if a system’s reactants have less PE than the products, the rxn will be
endothermic
What is the 1st law of thermodynamics?
energy of the universe is constant
what are the two parts of a thermodynamic quantity?
a number and a sign
the sign indicates the direction of flow from the system’s point of view
work done by a gas is
work done to a gas is
expansion
compression
for a gas at constant pressure work =
- P x change in V
