Bond Enthalpies

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

Using the table of average bond energies at the bottom of the image, what is the ΔH in kJ for the reaction above.

• +160 kJ

• -160 kJ

• - 63 kJ

• - 217 kJ

Tags

NGSS.HS-PS1-4

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 kJ

• - 350 kJ

• +102 kJ

• +350 kJ

Tags

NGSS.HS-PS1-4

Which of the following is TRUE about the bond-breaking process of the reactants?

• It absorbs energy.

• There's no energy involved.

• It releases energy.

Tags

NGSS.HS-PS1-4

Identify whether the reaction above is exothermic or endothermic. Use the table of bond energies found below the reaction. 

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

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? H₂O₂(g) → H₂O(g) + ½O₂(g)

• -102

• +102

• +350

• +394

Tags

NGSS.HS-PS1-4

Which of the following statements is true about bond enthalpy?

• Bond enthalpy is the energy required to break one mole of bonds in gaseous molecules.

• Bond enthalpy is the energy released when one mole of bonds is formed in gaseous molecules.

• Bond enthalpy is the energy change when one mole of solid is converted to gas.

• Bond enthalpy is the energy change when one mole of liquid is converted to gas.

Tags

NGSS.HS-PS1-4

The bond enthalpy of a C-H bond is 413 kJ/mol. What is the total energy required to break all C-H bonds in methane (CH4)?

• 1652 kJ/mol

• 826 kJ/mol

• 413 kJ/mol

• 2065 kJ/mol

Which of the following bonds has the highest bond enthalpy?

• C-C

• C=C

• C≡C

• C-H

Tags

NGSS.HS-PS1-4