Bond Energies

Bonds that are formed ____ energy, and bonds that are broken _____ energy.

• Absorb, absorb

• Absorb, release

• release, release

• release, absorb

Tags

NGSS.HS-PS1-4

When new chemical bonds form, energy ____________.

• is taken into the system.

• stays the same in the system.

• is released from 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

NGSS.HS-PS3-4

Which of the following bonds has the highest bond energy?

• C-H

• O=O

• N≡N

• C=C

Tags

NGSS.HS-PS1-4

What happens to the energy when a chemical bond is formed?

• Energy is absorbed

• Energy is released

• Energy remains constant

• Energy is converted to mass

Tags

NGSS.HS-PS1-4

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

• 1652 kJ/mol

• 826 kJ/mol

• 413 kJ/mol

• 2065 kJ/mol

Tags

NGSS.HS-PS1-4

Which of the following statements is true about bond energies?

• Bond energies are always positive

• Bond energies are always negative

• Bond energies can be both positive and negative

• Bond energies have no units

Tags

NGSS.HS-PS1-4