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Which change represents an increase in entropy?
potential energy
increases
3
endothermic, absorbing energy
an exothermic reaction
a decrease in the concentration of B(g)
Br2(s) --> Br2(g)
temperature is decreased and pressure is increased
Which phrase best describes the following reaction...2H2O(l) + heat <--> 2H2(g) + O2(g)
potential energy
increases
3
endothermic, absorbing energy
an exothermic reaction
a decrease in the concentration of B(g)
Br2(s) --> Br2(g)
temperature is decreased and pressure is increased
The delta H of a chemical reaction refers to the change in
potential energy
increases
3
endothermic, absorbing energy
an exothermic reaction
a decrease in the concentration of B(g)
Br2(s) --> Br2(g)
temperature is decreased and pressure is increased
2C(s) + H2(g) + 227.4 kJ <--> C2H2(g). If 682.2 kJ are absorbed, for how many moles of C2H2(g) are produced?
potential energy
increases
3
endothermic, absorbing energy
an exothermic reaction
a decrease in the concentration of B(g)
Br2(s) --> Br2(g)
temperature is decreased and pressure is increased
In most aqueous reactions as temperature increases, the effectiveness of collisions between reacting particles
potential energy
increases
3
endothermic, absorbing energy
an exothermic reaction
a decrease in the concentration of B(g)
Br2(s) --> Br2(g)
temperature is decreased and pressure is increased
N2(g) + 3H2(g) <--> 2NH3(g) + 92 kJ. A larger yield of NH3 is obtained when
potential energy
increases
3
endothermic, absorbing energy
an exothermic reaction
a decrease in the concentration of B(g)
Br2(s) --> Br2(g)
temperature is decreased and pressure is increased
A student observed that the temperature of water increased when a salt was dissolved in it. The student should conclude that dissolving the salt caused
potential energy
increases
3
endothermic, absorbing energy
an exothermic reaction
a decrease in the concentration of B(g)
Br2(s) --> Br2(g)
temperature is decreased and pressure is increased
A(g) + B(g) <--> C(g) + D(g). At constant temperature and pressure, an increase in the concentration of A(g) causes
potential energy
increases
3
endothermic, absorbing energy
an exothermic reaction
a decrease in the concentration of B(g)
Br2(s) --> Br2(g)
temperature is decreased and pressure is increased
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