Homework #47: Kinetics/Equilibrium Day 1-8

Each interval on the axis labeled "Potential Energy (kJ/mol)" represents 10. kilojoules per mole. What is the activation energy of the forward reaction?
Hint: It's the energy to roll the ball up the hill going from left to right

• 10. kJ/mol

• 30. kJ/mol

• 40. kJ/mol

• 60. kJ/mol

Tags

NGSS.HS-PS1-4

An effective collision between reactant particles requires the particles to have the proper (Choose two)

• 
  charge

• mass

• energy

• orientation

What is required for a chemical reaction to occur?

• 
  standard temperature and pressure

• 
  a catalyst added to the reaction system

• 
  effective collisions between reactant particles

• an equal number of moles of reactants and products

Tags

NGSS.HS-PS1-5

At 101.3 kPa and 298 K, a 1.0-mole (1 amount) sample of which compound absorbs the greatest amount of heat as the entire sample dissolves in water?

Hint: Absorb heat is endothermic

• LiBr

• NaCl

• NaOH

• NH₄Cl

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

For a reaction at equilibrium, which change can increase the rates of the forward and reverse reactions?

• a decrease in the concentration of the reactants

• a decrease in the surface area of the products

• an increase in the temperature of the system

• an increase in the activation energy of the forward reaction

Tags

NGSS.HS-PS1-5

The addition of a catalyst to a chemical reaction provides an alternate pathway that

• increases the potential energy of reactants

• 
  decreases the potential energy of reactants

• increases the activation energy

• decreases the activation energy

Tags

NGSS.HS-PS1-4

Which potential energy diagram represents the change in potential energy that occurs when a catalyst is added to a chemical reaction?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-4

Given the balanced equation representing a phase change:

C₆H₄Cl₂(s) + energy --> C₆H₄Cl₂(g)

Which statement describes this change? (Choose two)

• It is endothermic

• Entropy increases.

• It is exothermic

• Entropy decreases.

Tags

NGSS.HS-PS1-4

Given the balanced equation in the image:

Which statement best describes this process?(Choose two)

Hint: aq is a solution in liquid water

• It is endothermic

• Entropy increases.

• It is exothermic

• Entropy decreases.

Tags

NGSS.HS-PS1-4

Which expression represents the Heat of reaction for a chemical reaction in terms of the potential energy, PE, of its products and reactants?

• PE of products +

  PE of reactants

•  PE of products –

  PE of reactants

• PE of products ×

  PE of reactants

• PE of products /

  PE of reactants

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4