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. Topic 9 – Kinetics and Equilibrium

10. continues

2. Given the potential energy below

C + D
CD

The reaction CD -------- C + D is best described as

1) Exothermic, because heat is released 3) Endothermic, because heat is released
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2) Exothermic, because heat is absorbed 4) Endothermic, because heat is absorbed
3. Given the potential energy below

X + Y
XY

Which is true of the formation of XY from its elements?
1) The product have more energy than the reactants, and the reaction has -∆H
2) The product have less energy than the reactants, and the reaction has -∆H
3) The product have more energy than the reactants, and the reaction has +∆H
4) The product have less energy than the reactants, and the reaction has +∆H

4. The diagram below represents energy change that occurs during the formation of a compound
from its elements under standard conditions.

According to Reference Table I, the compound could be
1) C2H6(g) 2) HI(g) 3) NH3(g) 4) CO2(g)
5. A potential energy diagram for a chemical reaction is given below.

According to Reference Table I, which reaction could be represented by this potential energy diagram?
1) 2C2(s) + 3H2(g) ------- > C2H6(g) 3) N2(g) + O2(g) ----- > 2NO(g)
+
2) 2C(s) + 2H2(g) - ----- > C2H4(g) 4) NH4Cl(s) ----------------- > NH4 (aq) + Cl-(aq)
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