Chemistry Ch 15 - Heat Of Reactions Question Preview (ID: 46893)
System, Enthalpy And Enthalpy Of Reaction.
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which expression is correct?
a) universe = system + surroundings
b) system = universe + surroundings
c) surroundings = universe + system
d) universe = system - surroundings
When a reaction produces heat, the heat flows
a) from the system to the universe
b) from the surroundings to the system
c) from the system to the surroundings
d) from the universe to the system
The content of heat of a system is
a) enthalpy
b) enthalpy of reaction
c) thermal energy
d) kinetic energy
Which reaction is exothermic?
a) NH₄NO₃(s) -- NH₄⁺(aq) +NO₃⁻(aq) ΔHrxn = +27 kJ
b) H₂O₂(l) → H₂O(l) + 1/2 O₂(g) + 0 kJ
c) 4Fe(s) + 3O₂(g) -- 2Fe₂O₃(s) ΔHrxn = -1625 kJ
d) CO₂ (g) + H₂O (g) + 18.72 kJ -- H₂CO₃ (g)
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
If the H(reactants) = 340 J and H(products) = 200 J, what is the enthalpy (heat) of the reaction?
a) 200 J
b) 340 J
c) 140 J
d) -140 J
Which reaction happens in an ice pack?
a) endothermic
b) exothermic
c) double replacement
d) enthalpy
After an exothermic reaction
a) the products have more enthalpy than the reactants
b) the reactants have more enthalpy than the products
c) the products and reactants have the same enthalpy
d) the products gained heat energy from the surroundings
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) 340 J
d) 200 J
When a reaction produces heat, the heat flows
a) from the universe to the system
b) from the system to the surroundings
c) from the surroundings to the system
d) from the system to the universe
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