Energy, Enthalpy, and Thermochemistry
Vasquez (Aliens) is a Colonial Marine who lifts weights. What
equationfrom your text can be used to calculate the work
performed each time she benches 70 kg for her warmup?
The Systeme Internationale (SI) units for energy is the
________.
Exactly how many
joulesin one calorie?
How many
caloriesin 1 nutritional Calorie?
System tend to change to reach the
highest/lowest
energy possible.
The first law of thermodynamics is the conservation of
______.
Delta E = E(
final/initial) - E(
final/initial).
Delta E > 0 indicates that the system
gains/loses energy from its surroundings.
What are the
two mechanisms we have studied so far that transfer energy? What
thermodynamics equation sums up this idea?
Delta H = H(
products/reactants
) - H(
products/reactants
.)
For an
endothermic/exothermic
reaction, the products have a lower enthalpy of reaction than the
reactants.
a) 2 H2(g) + O2(g) -> 2 H2O(g) Delta H = -483.6 kJ
-
b) 1 H2(g) + (1/2) O2(g) -> 1 H2O(g) Delta H = -241.8 kJ
-
where 241.8 = 483.6 divided by 2
(
a is correct; b is correct, both are correct.)
The measure of heat flow is called
____________.
What is the definition of
heat capacity?
What are the
units
of specific heat?
Combustion reactions are carried out in a
___________ filled with what
gas and what
liquid?
The heat capacity of the calorimeter is
lower case, upper case c/C.
Name the two
enthalpies that
deal with phase transition.
The standard state of a substance
is ...
For Delta H (superscripted circle),
what type of condition does the superscripted circle indicate?
The conversion of graphite to diamond
requires/ gives off energy:
-
C (graphite) -> C (diamond)
-
Delta H (superscripted circle) = 1.88 kJ
Which chemical has an enthalpy of formation equal to zero?
H2O (g), H2O (l), O2 (g)
What is the definition of
fuel value?
What
chemical does your body convert carbohydrates to?
Name
three fossil fuels:
What is the composition of
natural gas?