Unit 13: Reaction Rates and Equilibrium

The red arrow on the bottom in the image represents _______________.

• overall energy change

• total energy loss

• net energy gain

• energy conservation

In an exothermic reaction, the initial energy is _______________ the final energy after the reaction.

• lower than

• equal to

• higher than

• none of the above

How does temperature affect reaction rates?

• Increasing temperature generally increases reaction rates by providing more energy to the reactants.

• Temperature has no effect on reaction rates.

• Higher temperatures slow down reaction rates due to increased molecular collisions.

• Lower temperatures increase reaction rates by reducing energy requirements.

What factors affect reaction rates?

• Concentration, temperature, surface area, and the presence of catalysts.

• Only temperature and concentration.

• The type of reaction and the color of the reactants.

• The pressure and volume of the reactants.

What role do catalysts play in chemical reactions?

• Catalysts increase the activation energy, slowing down the reaction.

• Catalysts lower the activation energy, speeding up the reaction without being consumed.

• Catalysts are consumed in the reaction, making it faster.

• Catalysts change the products of the reaction, altering the outcome.

What is the difference between activation energy and overall energy change?

• Activation energy is the energy needed to start a reaction, while overall energy change is the difference in energy between reactants and products.

• Activation energy is the total energy of the reactants, while overall energy change is the energy of the products.

• Activation energy is the energy released during a reaction, while overall energy change is the energy absorbed.

• Activation energy is the energy required to maintain a reaction, while overall energy change is the energy lost during the reaction.

What is Le Chatelier's principle?

• If a system at equilibrium is disturbed, it will shift in a direction that counteracts the disturbance.

• A principle stating that all chemical reactions are reversible.

• The law that states energy cannot be created or destroyed.

• A theory that explains the behavior of gases under pressure.

This reaction is _______________.

• endothermic

• exothermic

• isothermal

• adiabatic

The blue arrow on the top in the image represents _______________.

• catalytic energy

• activation energy

• kinetic energy

• potential energy

Define endothermic reaction.

• A reaction that releases energy into its surroundings.

• A reaction that absorbs energy from its surroundings.

• A reaction that occurs at a constant temperature.

• A reaction that produces heat.