Download Ch 10 Review activity

1. A 322 g sample of lead (specific heat =
0.138 J/goC) is placed into 264 g of water at
25oC.
If the system's final temperature is 46oC, what
was the initial temperature of the lead?
2. A 97 g sample of gold at 785oC is
dropped into 323 g of water, which has an
initial temperature of 15oC. If gold and
water have specific heats of 0.129 J/goC
and 4.184 J/goC respectively, what is the
final temperature of the mixture?
Assume that the gold and the water
experience no change in state of matter
4Fe(s) + 3O2(g) → 2Fe2O3(s)
ΔH = -1652 kJ
3. How many kcal
are released when
1.00g of Fe is reacted
with excess O2?
4. Calculate the heat capacity of a piece of
wood if 1500.0 g of the wood absorbs 67.4 kJ of
heat, and its temperature changes from 32°C to
57°C. When this piece of wood is burned,
would the combustion reaction be endothermic
or exothermic? Where does the energy that
would be transferred in this reaction come
from?
5. What is the enthalpy change when 12.8g
H2(g) reacts with excess Cl2(g) to form HCl(g)?
H2(g) + Cl2(g) → 2HCl(g)
ΔH = -184.6kJ
6. How much heat, in calories and kilocalories,
does it take to raise the temperature of 814g of
water from 18.0°C to 100°C?
7. What mass of water, in kilograms, can be
heated from 5.5°C to 55.0°C by 9.09x1010J of
heat?
8. A 0.8082g sample of glucose (C6H12O6) is
burned in a bomb calorimeter assembly, and the
temperature is noted to rise from 25.11°C to
27.21°C. Determine the heat capacity of the
bomb calorimeter assembly, given:
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(l)
ΔH = -2803kJ/mol
9. If 40.5 J of heat is added to a 15.4 g sample of
silver, how much will the temperature increase
by? The specific heat of silver is 0.235 J/goC.
10. What is the specific heat of silicon if the
temperature of a 4.11 g sample of silicon is
increased by 3.8 oC when 11.1 J of heat is
added?
11. Convert 23 calories into kcal.
Convert 7.9 kcal into calories.
Convert 234 J into kJ.
Convert 21.3 kJ into joules.
Convert 58 J into calories.
Convert 34 kJ into kcal.
1. Convert 23 calories into kcal.
2. Convert 7.9 kcal into calories.
3. Convert 234 J into kJ.
4. Convert 21.3 kJ into joules.
5. Convert 58 J into calories.
6.Convert 34 kJ into kcal.