Potential Energy Diagrams and Thermochemical Equations

Use the potential energy diagram to answer the question. Which arrow shows the enthalpy change?

• Arrow 1

• Arrow 2

• Arrow 3

• Arrow 4

Tags

NGSS.HS-PS1-4

Use the potential energy diagram to answer the question. Which arrow shows the activation energy for the reverse reaction?

• Arrow 1

• Arrow 2

• Arrow 3

• Arrow 4

Tags

NGSS.HS-PS1-4

Use the potential energy diagram to answer the question. Assuming that numbers were given, how could you calculate the potential energy for the products?

• $2\ -\ 3$

• $1-4$

• $4\ +\ 3$

• The potential energy of the products cannot be calculated

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What letter represents the enthalpy change (ΔH)?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

What type of reaction is this?

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4

What letter represents the activation energy for the forward reaction?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

What is the ΔH of the forward reaction?

• 40 kJ

• 20 kJ

• -20 kJ

• -60 kJ

Tags

NGSS.HS-PS1-4

What is the energy of the activated complex?

• 75 kJ
• 225 kJ
• 300 kJ
• 225 kJ

Tags

NGSS.HS-PS1-4

What is the sign of ΔH for all exothermic reactions?

• Positive

• Negative

What is the enthalpy change (ΔH) for the reverse reaction?

• 80 kJ

• -20 kJ

• 40 kJ

• 20 kJ

Tags

NGSS.HS-PS1-4