11. Standard pressure is:
A) 1 atm
B) 2 atm
C) 0.5 atm
D) 10 atm
Answer: A
12. The heat content of a system is called:
A) Entropy
B) Enthalpy
C) Energy
D) Work
Answer: B
13. Combustion reactions are usually:
A) Endothermic
B) Exothermic
C) Neutral
D) Reversible
Answer: B
14. Hess’s Law is based on:
A) Conservation of mass
B) Conservation of energy
C) Ideal gas law
D) Boyle’s law
Answer: B
15. Internal energy is represented by:
A) U
B) H
C) Q
D) W
Answer: A
16. ΔH = qp when process occurs at:
A) Constant volume
B) Constant pressure
C) Constant temperature
D) Constant mass
Answer: B
17. The enthalpy of formation is defined as:
A) Heat change forming 1 mole of compound
B) Heat change of 2 moles
C) Heat at high pressure
D) Heat of vaporization
Answer: A
18. Bond breaking is:
A) Exothermic
B) Endothermic
C) Neutral
D) No energy
Answer: B
19. Bond formation is:
A) Endothermic
B) Exothermic
C) Neutral
D) No energy
Answer: B
20. The unit of enthalpy change is:
A) J/mol
B) mol/J
C) J/K
D) kg/J
Answer: A