Calculate Enthalpy from Bond Energy

Is this equation endo- or exo-thermic?

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

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Is this equation endo- or exo-thermic?

2KNO₃ (s) + energy --> 2KNO₂ (s) + O₂

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

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

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

Which of the following represents an exothermic reaction?

• 
• 

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Using the table of average bond energies below the image, the ΔH for the reaction in kJ is.....

• + 160 kJ

• -63 kJ

• - 160 kJ

• -217 kJ

Tags

NGSS.HS-PS1-4

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Using the reaction & table above, determine the change in energy and whether or not the reaction is endothermic or exothermic:

• -2054 kJ endothermic

• 2045 kJ endothermic

• -2045 kJ exothermic

• 2045 kJ exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

How much energy is required to break all of the bonds in the first molecule depicted in the reaction above? (you must include the proper sign for credit)

Tags

NGSS.HS-PS1-4

Tags

NGSS.HS-PS1-4

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1