Understanding Exothermic and Endothermic Processes

What is the primary factor that determines whether a reaction is exothermic or endothermic?

• The temperature of the surroundings

• The volume of the system

• The change in enthalpy

• The color of the reactants

In thermodynamics, what is typically considered the 'system'?

• The reaction vessel

• The laboratory

• The surroundings

• The entire universe

If a process has a positive Delta H, what can be inferred about the system?

• The system is isolated

• The system is gaining energy

• The system is losing energy

• The system is at equilibrium

Which of the following is an example of an endothermic physical process?

• Deposition

• Condensation

• Freezing

• Melting

What happens to the particles in an exothermic physical process?

• They change color

• They become closer together

• They gain energy

• They move further apart

Which process is associated with a negative Delta H?

• Evaporation

• Sublimation

• Condensation

• Melting

What is required for a chemical bond to break?

• Energy release

• Energy input

• Temperature decrease

• Pressure increase

In a chemical reaction, what does bond formation result in?

• Volume expansion

• Temperature increase

• Energy release

• Energy absorption

In a reaction progress diagram, what does a higher final energy of products indicate?

• A reversible reaction

• A spontaneous reaction

• An endothermic process

• An exothermic process

What does the blue curve in an enthalpy vs. reaction progress diagram represent?

• A neutral process

• An exothermic process

• A reversible process

• An endothermic process