7.2 Quizziz

What does the flat line on the left side of the potential energy graph represent?

• The energy of the products

• The activation energy

• The energy of the reactants

• The transition step

What does the peak of a potential energy diagram represent?

• The energy of the reactants

• The energy of the products

• The activation energy of the reaction

• The enthalpy change

What is the role of temperature in overcoming activation energy?

• It decreases the activation energy

• It increases the activation energy

• It provides the energy needed to overcome the activation energy

• It has no effect on activation energy

Tags

NGSS.HS-PS1-5

What is the final energy compared to the initial energy in an endothermic reaction?

• Final energy is lower

• Final energy is higher

• Final energy is the same

• Final energy is zero

Tags

NGSS.HS-PS1-4

What is the activation energy?

• The energy released during a reaction

• The energy needed for a reaction to proceed

• The energy stored in the products

• The energy stored in the reactants

Why do wired earbuds often get tangled when stored in a pocket?

• enthalpy

• Their energy is too high

• They are designed to tangle

• Random motion and probability (entropy)

In the reaction Zn(s) + Cl₂(g) → ZnCl₂(s), what happens to the entropy of the system?

• Entropy increases

• Entropy decreases

• Entropy remains the same

• Entropy cannot be determined

Tags

NGSS.HS-PS3-4

Which phase change is associated with an increase in entropy?

• Solid to liquid

• Liquid to solid

• Gas to liquid

• gas to aqueous

Tags

NGSS.MS-PS1-4

According to the potential energy diagram shown above, the chemical reaction in the forward direction is

• exothermic because it absorbs energy

• exothermic because it releases energy

• endothermic because it absorbs energy

• endothermic because it releases energy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

The potential energy diagram of a reaction is shown. What does circle (#2) represent?

• Potential Energy of the Reactants

• Potential Energy of the Products

• Change of Heat Energy (enthalpy)

• Activation Energy

Tags

NGSS.HS-PS1-4