Thermochemistry Review
Name _______________________
Date _________________ Per ___
1) Indicate whether each of the following processes is endothermic or exothermic, and whether q is + or - .
Endo- or exothermic
Sign of q (+ or -)
melting of ice
evaporation of ethanol
condensation of steam
sublimation of iodine
C6H6(l) → C6H6(s)
2) Complete this phase change diagram. Write in the names of the phases (SOLID, LIQUID, GAS) on the
dotted lines and the phase change processes on the arrows. The little dots represent atoms or molecules of
the substance.
3) Define:
a) Heat
b) Specific heat capacity
c) Molar heat capacity
d) Heat of fusion
e)
f)
g)
h)
Heat of vaporization
Melting
Deposition
Condensation
4) Balance the following reaction .Is this reaction exothermic or endothermic?
____HCl + ____Ca(OH)2 Æ ____H2O + ____CaCl2 + 112 KJ
5) Explain the difference between heat and temperature.
6) Which of the following has the greatest specific heat? (assume temp. change to be the same)
a. 100 g water or 1000 g water
b. 100 g water or 100 g copper
Calculation problems:
1) How much heat is required to raise the temp of 205 g of water from 15.2°C to 26.2°C?
2) What mass of 67.5°C iron must be added to 235 g of 5.00°C water to make the final temp of both come out
to be 15.0°C? (specific heat of iron = 0.444 J/g°C)
3) A 195 g aluminum engine part at an initial temperature of 3.00°C absorbs 40.0 KJ of heat. What is the final
temperature of the part? (specific heat of aluminum = 0.897 J/g°C)
4) When 300 J of energy is lost from a 125g object, the temperature decreases from 45°C to 40°C. What is the
specific heat of this object?
5) How many kJ of energy are needed to raise the temperature of 165g of water from 10.5°C to 47.32°C?
(Hint: How many J are in 1 kJ?)
6) How much energy is absorbed by 15 g of ice being melted? H2O (s) Æ H2O (l)
∆Hfus = 6.02 kJ / mol
Review topics:
7) Calculate the Molar masses of Calcium Phosphate
8) How many moles of Na2CO3 are there in 10.0 L of 2.0 M solution?
9) Find the molarity of a solution containing 59 g HCl in 500 ml water.
10) How many moles of gas would be present in a gas trapped within a 100.0 mL vessel at 25.0 °C at a pressure
of 2.50 atmospheres?
11) For the Bromine, determine the following:
Group #
# of Protons
Electron configuration
Period #
# of neutrons
# of valence electrons
Atomic #
# of electrons
Lewis dot diagram
Mass #
Family name
Remember to review other topics previously covered!