Name___________________________
Period_________________
Date__________
1) What is the difference between Kinetic and Potential Energy?
2) What is the Law of Conservation of Energy?
3) Jimmy thinks it would be a good idea ride his skateboard down the hall by
Mr. Stitt, screaming his affection for Chemistry, Furbys, and pink sprinkled
cupcakes to the tune of “Poker Face” by Lady Gaga. Jimmy is not good at
skateboarding. He plants his face into the picnic table outside of Mr. Stitt’s
classroom.
Describe the energy in this situation, and explain why (even though
Jimmy isn’t moving anymore) energy has been conserved.
4) Define a State Function, Exothermic and Endothermic. Give an example of
each:
State Function:
Exothermic:
Endothermic:
5) Is the following an example of an endothermic or exothermic reaction?
Which quantity (A, B, or C) represents the net energy released/absorbed
to/from the surroundings?
6) What is a calorie? What unit does the SI unit joule mean?
7) Determine the amount of energy (heat) in joules is required to raise the
temperature of 14.2 grams of water from 32.3C to 62.7C?
8) What is specific heat (specific heat capacity) and how can it be used to
identify a substance?
9) Calculate the amount of energy required to heat a piece of iron with a mass of
82.3g from 20.3C to 84.3C (specific heat of iron = CFe = 0.451J/gC
10)What is T and how is it calculated?
11)What is the energy (Q) released by a piece of Iron (CFe = 0.451J/gC) as it
changes from 101.5C to 23.2C?
12)A piece of metal that looks like gold is tested. It requires 25.7 Joules of energy
to change a 3.4g sample’s temperature from 24.3C to 37.2C. Is the metal
actually gold? (CAu = 0.13J/gC)
13)What is the difference between Heat and Temperature?
14)What is a system? Describe what is happening to the system’s energy during
an exothermic reaction? Describe where this energy is coming from.
15)What does Enthalpy represent?
16)The enthalpy of combustion of methane (HCH4) is 890kJ/mol at constant
pressure (no work done). That means that when 1 mole of CH4 is burned
890kJ are released as heat energy. The thermochemical equation is written
as
CH4 + 2O2  CO2 + 2H2O H = 890kJ
a. Is this an endothermic or an exothermic reaction?
________________________
b. If 2 moles of CH4 are burned, how many kJ of energy would be
released? (show work)
c. If 65.3 grams of CH4 are burned, how many kJ of energy are evolved?
(show work)
17)Write the following balanced thermochemical equations, using either (+) or
(-) for H. Label as exothermic or endothermic
a. Potassium + Iodine yields potassium iodide + Energy
b. Solid sodium hydrogen carbonate + water + Energy yields aqueous
sodium hydrogen carbonate + water
c. Ammonium hydroxide + Energy yields ammonia and water