Chemistry Se 11 C
6 Questions
| Attempts: 185
Questions and Answers
- 1.Which of the following applies to an exothermic reaction?
- A.
Hfinal < Hinitial ∆H < 0
- B.
Hfinal < Hinitial ∆H > 0
- C.
Hfinal > Hinitial ∆H > 0
- D.
Hfinal > Hinitial ∆H < 0
- 2.A change in the internal energy of a system at constant pressure from a chemical reaction will result in an identical change in the —
- A.
Enthalpy of the system
- B.
Entropy of the system
- C.
Free energy of the system
- D.
Specific heat of the system
- 3.Which of the following equations is an exothermic reaction?
- A.
H2 (g) + ½ O2 (g) → H2O (l) ΔH = -285.8 kJ
- B.
HgO (s) → Hg (l) + ½ O2 (g) ΔH = +90.7 kJ
- C.
4CO2(g) +6H2O(l) →2C2H6(g) +7O2(g) ΔH =+3120 kJ
- D.
SO2 (g) → S(s)+ O2 (g) ΔH = +296 kJ
- 4.A sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature drops rapidly. Which of the following statements is best supported by this observation?
- A.
An endothermic reaction occurred.
- B.
A dehydration reaction occurred.
- C.
The water was originally warmer than the compound.
- D.
The beaker was contaminated by another compound.
- 5.
The table below shows the standard enthalpy of formation for each of three substances.CaCO decomposes according to the equation CaCO3 (s) --> CaO(s) + CO2 (g). What is the enthalpy of reaction?- A.
177.8 kJ
- B.
-177.8 kJ
- C.
−1029 kJ
- D.
−2236 kJ
- 6.What is the term for the amount of energy absorbed or released in a chemical reaction?
- A.
Heat of reaction
- B.
Heat of vaporization
- C.
Heat of condensation
- D.
Heat of sublimation
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