Interpreting Potential Energy Diagrams

What is the first requirement for an effective collision?

• High temperature

• Presence of a catalyst

• Low pressure

• Proper orientation of reactant particles

In a potential energy diagram, where are the reactants located?

• At the top of the curve

• On the left side of the curve

• On the right side of the curve

• At the bottom of the curve

Tags

NGSS.HS-PS1-4

What does the green arrow represent in a potential energy diagram?

• Potential energy of the products

• Activation energy

• Enthalpy change

• Potential energy of the reactants

What is the potential energy of the activated complex in the given example?

• 40 kilojoules

• 45 kilojoules

• 5 kilojoules

• 35 kilojoules

Tags

NGSS.HS-PS1-4

How do you calculate the activation energy from a potential energy diagram?

• Subtract the potential energy of the reactants from the potential energy of the activated complex

• Divide the potential energy of the activated complex by the potential energy of the reactants

• Add the potential energy of the reactants and products

• Subtract the potential energy of the products from the potential energy of the reactants

What is Delta H in a chemical reaction?

• The total energy of the reactants

• The difference between the potential energy of the products and reactants

• The total energy of the products

• The amount of energy needed to start a reaction

Tags

NGSS.HS-PS1-4

How is Delta H calculated in the given example?

• 45 - 5

• 35 - 5

• 5 - 35

• 5 + 35

What characterizes an endothermic reaction in a potential energy diagram?

• Potential energy of the products is less than the reactants

• No change in potential energy

• Energy is released

• Potential energy of the products is greater than the reactants

Tags

NGSS.HS-PS1-4

Which type of reaction will have a negative Delta H value?

• Exothermic reaction

• Neither endothermic nor exothermic reactions

• Endothermic reaction

• Both endothermic and exothermic reactions

Tags

NGSS.HS-PS1-4

What does a positive Delta H value indicate about a reaction?

• The reaction is non-spontaneous

• The reaction is exothermic

• The reaction is endothermic

• The reaction is spontaneous