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Chemistry Ch 15 - Heat Of Reactions
Test Description: System, enthalpy and enthalpy of reaction
Instructions: Answer all questions to get your test result.
1) which expression is correct?
A
system = universe + surroundings
B
surroundings = universe + system
C
universe = system - surroundings
D
universe = system + surroundings
2) When a reaction produces heat, the heat flows
A
from the universe to the system
B
from the system to the universe
C
from the system to the surroundings
D
from the surroundings to the system
3) The content of heat of a system is
A
enthalpy of reaction
B
kinetic energy
C
enthalpy
D
thermal energy
4) Which reaction is exothermic?
A
CO₂ (g) + H₂O (g) + 18.72 kJ -- H₂CO₃ (g)
B
4Fe(s) + 3O₂(g) -- 2Fe₂O₃(s) ΔHrxn = -1625 kJ
C
NH₄NO₃(s) -- NH₄⁺(aq) +NO₃⁻(aq) ΔHrxn = +27 kJ
D
H₂O₂(l) → H₂O(l) + 1/2 O₂(g) + 0 kJ
5) what is the enthalpy (heat) of the reaction 2C₂H₂(g) + 5O₂(g) ⟶ 4CO₂(g) + 2H₂O(g) +2511.6 kJ ?
A
2511.6 kJ
B
-2511.6 kJ
C
0 kJ
D
+2511.6 kJ
6) If the H(reactants) = 340 J and H(products) = 200 J, what is the enthalpy (heat) of the reaction?
A
340 J
B
200 J
C
-140 J
D
140 J
7) Which reaction happens in an ice pack?
A
endothermic
B
exothermic
C
double replacement
D
enthalpy
8) After an exothermic reaction
A
the reactants have more enthalpy than the products
B
the products have more enthalpy than the reactants
C
the products and reactants have the same enthalpy
D
the products gained heat energy from the surroundings
9) If the H(reactants) = 340 J and H(products) = 200 J, what is the enthalpy (heat) of the reaction?
A
140 J
B
-140 J
C
200 J
D
340 J
10) When a reaction produces heat, the heat flows
A
from the surroundings to the system
B
from the universe to the system
C
from the system to the universe
D
from the system to the surroundings
*select an answer for all questions
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