Bond Energy

The average bond enthalpies for O-O and O=O are 146 and 496 kJ/mol respectively. What is the enthalpy change, in kJ, for the reaction below?

H-O-O-H(g) → H-O-H(g) + ½O=O(g)

• -102

• +102

• +350

• +394

Tags

NGSS.HS-PS1-4

For the reaction 2H₂(g) + O₂(g) → 2H₂O(g) the bond enthalpies (in kJ/mol) are H-H = x, O=O = y, O-H = z Which calculation will give the value, in kJ/mol, of ΔH for the reaction?

• 2x + y - 2z

• 4z - 2x - y

• 2x + y - 4z

• 2z - 2x - y

Tags

NGSS.HS-PS1-4

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

When new chemical bonds form, energy ____________.

• is taken into the system.

• is released from the system.

• stays the same in the system.

Tags

NGSS.HS-PS1-4

What is the average bond energy of H-H ?

Tags

NGSS.HS-PS1-4

What is the average bond energy of C-H ?

Tags

NGSS.HS-PS1-4

What is the average bond energy of N-Cl ?

Tags

NGSS.HS-PS1-4

Calculate the bond energy of H₂O.

• 467 kJ

• 934 kJ

• 432 kJ

• 864 kJ

Tags

NGSS.HS-PS1-4

Calculate the bond energy of NH₃.

• 391 kJ

• 782 kJ

• 1,173 kJ

• 1,296 kJ

Tags

NGSS.HS-PS1-4

Calculate the bond energy of 2HF.

• 565 kJ

• 1,130 kJ

• 432 kJ

• 154 kJ

Tags

NGSS.HS-PS1-4