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WorksheetsThermo Test Review
Total questions: 15
Worksheet time: 8mins
The equation for cellular respiration is shown:
C6H12O6 + 6O2 --> 6CO2 + 6H2O + heat
What can be concluded about the heat energy in the reaction?
The reaction absorbs heat and is, therefore, endothermic.
The reaction absorbs heat and is, therefore, exothermic.
The reaction releases heat and is, therefore, exothermic.
The reaction releases heat and is, therefore, endothermic.
The specific heat of platinum is 0.133 J/g°C. How much heat(Q) is absorbed when a 10 g piece of platinum warms from 100°C to 150°C?
66.5 J
0.0266 J
665 J
0.665 J
We are trying to determine the calories in a potato chip by burning it. This is done by burning under a can of water so you can measure the heat absorbed by the water. Use the data to the left and that the specific heat of water is 1 calorie/gramoC to calculate the calories gained by the water.
190 cal
60 cal
730 cal
1000 cal
Calculate ΔH for the process
Zn (s) + S (s) + 2O2 (g) → ZnSO4 (s)
from the following information:
Zn (s) + S (s) → ZnS (s) ΔH = – 206.0 kJ
ZnS (s) + 2 O2 (g) → ZnSO4 (s) ΔH= – 776.8 kJ
570.8 kJ
-570.8 kJ
-982.8 kJ
982.8 kJ
Students are trying to calculate the heat of reaction for the following overall reaction.
4A + 5B → C + 3D
They find the heat of reactions for the two reactions as shown.
2A + 2B → C + 2D ΔH= -100 kJ
2A +3B → D ΔH= 65 kJ
-35 kJ
-165 kJ
35 kJ
165 kJ
If two objects have different temperatures when they come in contact, heat will flow from the warmer object to the cooler one UNTIL ____________
one reaches a temperature of zero
one runes out of energy
they both have equal temperature
Ammonium nitrate and sodium chloride are each combined with water to make two solutions. The initial and final temperatures of the water are recorded in the table to the left. Based on the data, which is a true statement(s)?
Dissolving ammonium nitrate is endothermic
Dissolving sodium chloride is exothermic
Dissolving ammonium nitrate is exothermic
Dissolving sodium cloride is endothermic
The specific heat of water is 1 cal/g°C.
If 43.1 cal of energy is added to 6.20 g of water at 18.0 °C, what is the final temperature of the water?
6.95 °C
19.8 °C
-11.1 °C
25.0 °C
A student is planning the find the specific heat of iron. To the left are the steps... what is the missing step?
Measure the initial temperature of the water in a known mass of water
Measure the initial temperature of the iron
Measure the initial volume of the iron
Measure the final mass of water
Select all which are endothermic...
H2O(L)-->H2O(g)
H2O(s)-->H2O(L)
H2O(g)-->H2O(L)
H2O(L)-->H2O(s)
Use the graphs to help answer:
In an exothermic reaction, which has more potential energy?
neither
products
reactants
both are equal
There are four cups of hot cocoa. The cup sizes are shown. The temperature of the cocoa in each cup is 25 degrees celsius. Which cup has the MOST thermal energy?
Venti
Trenta
Tall
All three are the same temp so they have the same thermal energy
A sample of iron receives 50.J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample? (show your work)
25 g
20 g
30 g
50 g
Which graph represents a reaction that is endothermic and why>
Graph 2, because the reactants have lower potential energy than the products
Graph 1, because the products have lower potential energy than the reactants
Graph 1, because the reactants have lower potential energy than the products
Graph 2, because the products have lower potential energy than the reactants
If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1200 g of water from 23 °C to 39 °C?
-80,256 J
80.256 J
-80.256 J
80,256 J
