Mr. Anderson explains exothermic and endothermic reactions, focusing on how heat is released or absorbed. He uses examples like thermite reactions and cold packs to illustrate these concepts. The video also covers energy diagrams, showing how energy changes during reactions, and discusses activation energy. Finally, it explains how to measure these reactions in a lab using temperature changes.

What does 'exo' in exothermic mean?

• To change

• To maintain

• To release

• To absorb

What is the system in a chemical reaction?

• The chemicals where the reaction takes place

• The reactants and products only

• The entire laboratory

• The environment outside the reaction

In an exothermic reaction, where does the heat go?

• It disappears

• It is released to the surroundings

• It is absorbed by the reactants

• It is absorbed by the products

Which reaction type absorbs heat from its surroundings?

• Neither A nor B

• Endothermic

• Both A and B

• Exothermic

How can we observe temperature change in a reaction in the lab?

• By using an energy diagram

• By measuring the color change

• By observing the reaction speed

• By measuring the temperature change

What does an energy diagram of an exothermic reaction typically show?

• Equal energy in reactants and products

• Reactants with more energy than products

• No change in energy

• Reactants with less energy than products

What does the downhill slope in an energy diagram indicate?

• Exothermic reaction

• Endothermic reaction

• Equilibrium state

• No reaction

What is the role of activation energy in a chemical reaction?

• It is the energy required to break bonds in the reactants

• It is the energy released when new bonds form

• It is the total energy of the products

• It is the energy stored in the reactants

What is an example of an endothermic reaction?

• Combustion of gasoline

• Mixing water and ammonium nitrate

• Formation of ice

• Burning of wood

Why do endothermic reactions feel cold?

• Because they are at equilibrium

• Because they release heat

• Because they absorb heat

• Because they produce light