Enthalpy Test

ΔH value in an endothermic reaction is a positive number.

• True
• False

What type of reaction is shown in the reaction pathway?

• endothermic reaction
• exothermic reaction

Is this equation endo- or exo-thermic?

PCl₃ (s) + Cl₂ (g) --> PCl₅ (s) + energy

• endothermic

• exothermic

Is this equation endo- or exo-thermic?

2KNO₃ (s) + energy --> 2KNO₂ (s) + O₂

• endothermic

• exothermic

Based upon the graph above, what type of reaction is this?

• Endothermic

• Exothermic

Which of the following represents an exothermic reaction?

• 
• 

If a chemical reaction is EXOTHERMIC, the temperature of the surroundings would....

• Stay the same

• Increase

• Decrease

A process in which a system absorbs heat from its surroundings

• Enthalpy

• First Law of Thermodynamics

• Endothermic

• Exothermic

Heat evolved or absorbed in a reaction at constant pressure

• Heat

• Enthalpy

• Endothermic

• Exothermic

A catalyst works by

• changing the order of the reaction
• increasing the temperature
• lowering the activation energy
• making the activated complex