MP3 Potential Energy Diagram Analysis/ Rates CL Work

What is the role of a catalyst in a chemical reaction?

• It decreases the temperature of the reaction

• It increases the concentration of reactants

• It speeds up the reaction

• It changes the color of the reactants

• Lowers the activation energy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

What do the double arrows (⇌) in a chemical equation indicate?

• The reaction is irreversible

• The reaction is reversible

• The reaction is complete

• The reaction is exothermic

What does ΔH represent in a potential energy diagram?

• The change in temperature

• The change in mass

• The enthalpy change

• The change in volume

In an endothermic reaction, how does the total potential energy (PE) of the system change?

• It decreases

• It remains the same

• It increases

• It fluctuates

Tags

NGSS.HS-PS1-4

What is the sign of ΔH for an exothermic reaction?

• Positive

• Negative

• Zero

• Undefined

Tags

NGSS.HS-PS1-4

How can the change in enthalpy (ΔH) of a reaction be determined?

• Energy of reactants minus energy of products

• Energy of products minus energy of reactants

• Energy of activated complex minus energy of reactants

• Energy of reactants plus energy of products

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What does a positive ΔH indicate about a reaction?

• The reaction is exothermic

• The reaction is endothermic

• The reaction is at equilibrium

• The reaction is spontaneous

Tags

NGSS.HS-PS1-4

What is the value for ΔH?

• 10 kJ

• 120 kJ

• 30 kJ

• 40 kJ

• 80 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the value for the activation energy of the reverse reaction without a catalyst?

• 15 kJ

• 25 kJ

• 60 kJ

• 45 kJ

Tags

NGSS.HS-PS1-4

What is the value for the activation energy of the reverse reaction with a catalyst?

• 20 kJ

• 40 kJ

• 100 kJ

• 45 kJ

Tags

NGSS.HS-PS1-4