Do you know Thermo?

Quiz by Natalie Wieland

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15 questions
• Q1
A hot object is placed into a beaker of cold water, which of the following is true...
heat is transferred from the water to the object until the reach the same temperature
heat is transferred from the object to the water until they reach the same temperature
heat is transferred from the object to the water until their change in temperature is the same
heat is transferred from the water to the object until their change in temperature is the same
60s
• Q2
In the q = m C delta T equation, the m stands for
molarity
moles
mass
volume
30s
• Q3
If you preform a chemical reaction, why/how do you get a q?
because the two reactants are at different temperatures
there is no q for a reaction
because the reaction overall gains or loses energy from or to the surroundings
60s
• Q4
How is q different than delta H?
they are very different
delta H is a heat energy ratio constant for a reaction, while q is heat energy specific for amounts reacted.
They are the same
delta H is an endothermic process, while q is an exothermic process
60s
• Q5
If a student is doing a reaction in a test tube, and the test tube starts to feel cold, the reaction is...
enthalpy
exothermic
endothermic
60s
• Q6
For the reaction: 34kJ + N2 + 3H2 --> 2NH3, the reaction is
exo with a delta H of -34kJ/mol
endo with a delta H of -34 kJ/mol
endo with a delta H of + 34kJ/mol
exo with a delta H of +34 kJ/mol
60s
• Q7
For the reaction, CH4 + 2O2 ---> CO2 + 2H2O the delta H is -50kJ/mol. If four moles of oxygen react, how much heat would be released?
25 kJ
50 kJ
100 kJ
60s
• Q8
For the reaction, CH4 + 2O2 --> CO2 + 2H2O the delta H is -50kJ/mol. If you want the reaction to produce 200 kJ of heat, how many moles of CH4 should you react with excess O2?
2
4
1
60s
• Q9
If CH4 + 2O2 --> CO2 + 2H2O has a delta H of -50kJ/mol. What would be the delta H for this reaction: 3CO2 + 6 H2O --> 3CH4 + 6 O2
+ 150 kJ/mol
+50
- 150 kJ/mol
60s
• Q10
For the reaction, N2(g) + 3H2(g) --> 2NH3(g), predict the sign of the delta S.
positive
negative
zero
60s
• Q11
Which of the following values is zero for elements and diatomics
entropy
heat of formation
entropy and heat of formation
neither entropy nor heat of formation
60s
• Q12
Nature favors
negative delta S and positive delta H
negative delta S and negative delta H
positive delta S and positive delta H
positive delta S and negative delta H
60s
• Q13
For a reaction to be spontaneous, you need which sign
negative delta G
negative delta H
positive delta S
positive delta G
60s
• Q14
A reaction has a positive delta H and a negative delta S, when will this reaction be spontaneous?
at high temps
never
always
at low temps
60s
• Q15
A reaction has a delta H of +50.0 kJ/mol, a delta S of +130J/mol K. At 298 Kelvin, will this reaction be spontaneous?
no, you have a negative delta G
No, you have a positive delta G
yes, you have a negative delta G
yes, you have a positive delta G
120s

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