TED-ED: What triggers a chemical reaction? - Kareem Jarrah

The video tutorial explains the concepts of enthalpy and entropy in chemical reactions. Enthalpy involves the energy changes during reactions, with exothermic reactions releasing energy and endothermic reactions absorbing it. Entropy measures the randomness or disorder in a system, influencing reaction likelihood. The tutorial uses analogies like crazy golf and campfires to illustrate these concepts, showing how energy and disorder drive chemical processes.

What is the primary difference between exothermic and endothermic reactions?

• Exothermic reactions absorb energy, while endothermic reactions release energy.

• Exothermic reactions release energy, while endothermic reactions absorb energy.

• Both exothermic and endothermic reactions release energy.

• Both exothermic and endothermic reactions absorb energy.

In the golf analogy, what does the ball represent in a chemical reaction?

• The reactant in the reaction

• The product of the reaction

• The catalyst of the reaction

• The energy required for the reaction

How does entropy influence chemical reactions?

• It stabilizes the reactants, preventing reactions.

• It decreases the randomness in a system, making reactions less likely.

• It increases the randomness in a system, making reactions more likely.

• It has no effect on the likelihood of reactions.

What happens to the entropy of a system when a structured pyramid of golf balls collapses?

• Entropy decreases as the structure becomes more ordered.

• Entropy increases as the structure becomes more disordered.

• Entropy is not affected by the collapse of the structure.

• Entropy remains the same as the structure changes.

Which of the following best describes the role of a match in lighting a campfire?

• It decreases the entropy of the wood.

• It provides energy to start the exothermic reaction of combustion.

• It absorbs energy from the wood to start the reaction.

• It acts as a catalyst to slow down the reaction.