Endothermic vs Exothermic Reactions Explained

The video tutorial explains potential energy diagrams, which illustrate the reaction pathway from reactants to products. It covers the collision theory, activation energy, and the transition state. The differences between endothermic and exothermic reactions are discussed, highlighting how energy is absorbed or released. The role of catalysts in lowering activation energy and speeding up reactions is also explained. The tutorial concludes with a summary of key points and practical implications, emphasizing the importance of understanding reaction profiles.

What do potential energy diagrams illustrate?

• The reaction pathway for a reaction

• The color change in a reaction

• The temperature change in a reaction

• The speed of a reaction

Tags

NGSS.HS-PS1-4

Which of the following is NOT a requirement for reactants to become products?

• Reactants must collide with enough energy

• Reactants must collide with each other

• Reactants must collide in the correct orientation

• Reactants must be in a liquid state

Tags

NGSS.HS-PS1-5

What is the term for the energy required to break bonds and reach the transition state?

• Kinetic energy

• Activation energy

• Thermal energy

• Potential energy

In an endothermic reaction, how does the energy of the products compare to the reactants?

• Products have more energy than reactants

• Products have variable energy compared to reactants

• Products have less energy than reactants

• Products have the same energy as reactants

Tags

NGSS.HS-PS1-4

What does a positive Delta H indicate in a reaction?

• The reaction is exothermic

• The reaction is spontaneous

• The reaction is endothermic

• The reaction is at equilibrium

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

• It reacts with the reactants

• It changes the energy of the products

• It lowers the activation energy requirement

• It increases the energy of reactants

How does a catalyst affect the peak in a potential energy diagram?

• It shifts the peak to the left

• It makes the peak higher

• It makes the peak lower

• It shifts the peak to the right

Tags

NGSS.HS-PS1-4

In an exothermic reaction, what happens to the energy of the surroundings?

• The surroundings remain at the same energy level

• The surroundings become colder

• The surroundings release energy

• The surroundings absorb energy

Tags

NGSS.HS-PS3-4

What is the enthalpy value (Delta H) for an exothermic reaction?

• Variable

• Zero

• Positive

• Negative

Tags

NGSS.HS-PS1-4

If a reaction inside a beaker feels cold to the touch, what type of reaction is it?

• Exothermic

• Endothermic

• Spontaneous

• Neutral

Tags

NGSS.HS-PS1-4