Thermochemistry TEST REVIEW
Vocabulary
Words to Know:
 Thermochemistry
 Calorimeter
 Temperature
 Heat
 Joule
 Specific Heat
 Heat of Reaction
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Thermochemical Equation
Enthalpy Change
Law of Conservation of Energy
Endothermic
Exothermic
Potential Energy
Example Questions:
1. ________________________ is the energy that transfers from one object to another because of a
temperature difference between them.
2. The ______________________________ is the quantity of energy released or absorbed as heat during
a chemical reaction.
3. A reaction that releases heat to its surroundings is known as ________________________
4. A reaction that absorbs heat from its surroundings is known as _________________________
5. __________________________ is the amount of energy required to raise the temperature of one
gram of substance by one Celsius degree (◦C) or one Kelvin (1 K).
Calculations
Be able to calculate heat, mass, specific heat, or change in temperature using the following formula:
q = m x cp x ΔT
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Can you manipulate the formula to solve for the other variables?
m=

q=
Cp =
ΔT =
What are the units for:
m=
Cp =
ΔT =
Example Questions:
1. How much heat is required to warm 275 g of water from 76 °C to 87 °C? (specific heat of water = 4.18
J/g °C)
2. PCl3 is a compound used to manufacture pesticides. A reaction requires that 96.7 g of PCl3 be raised
from 31.7 °C to 69.2°C. How much energy will this require given that the specific heat of PCl3 is 0.874
J/g °C?
3. A quantity of water is heated from 25.0 °C to 36.4 °C by absorbing 325 J of heat energy. What is the
mass of the water? (specific heat of water = 4.18 J/g °C)
4. A 500. g sample of an unknown metal releases 6.4 x 102 J as it cools from 55.0 °C to 25.0 °C. What is the
specific heat of the sample?
ΔH = ΔHProducts - ΔHReactants
Calculate the heat of reaction for the following reaction. You will need to balance the equation FIRST!
___NO(g) + ___O2(g)  ___NO2(g)
Periodic Table Trends
Make sure you know the trends of the periodic table for:
Electronegativity, Ionization Energy, Atomic Radius and Ionic Radius
1. Circle the atom in each pair that has the largest atomic radius.
a. Al or B
d. Br or Cl
b. Na or Al
e. O or F
c. S or O
f. Mg or Ca
2. Circle the atom in each pair that has the greater electronegativity.
a. Ca or Ga
d. Ba or Sr
b. Br or As
e. Cl or S
c. Li or O
f. O or S
3. What is the difference between electronegativity and ionization energy?