Exothermic and Endothermic Reactions Quiz

What is a common characteristic of exothermic reactions?

• They require a catalyst to proceed.

• They release heat into the surroundings.

• They occur only in liquid form.

• They absorb heat from the surroundings.

In the whoosh bottle demonstration, what causes the characteristic sound?

• The rapid cooling of ethanol vapor.

• The slow burning of ethanol vapor.

• The rapid ignition of ethanol vapor.

• The mixing of ethanol with water.

What are the products of the thermite reaction?

• Iron oxide and aluminum powder.

• Aluminum oxide and iron metal.

• Hydrogen gas and oxygen gas.

• Water and carbon dioxide.

What is a key feature of endothermic reactions?

• They produce light as a byproduct.

• They absorb heat from the surroundings.

• They release heat into the surroundings.

• They occur spontaneously without any heat.

What happens when barium hydroxide is mixed with ammonium thiocyanate?

• The mixture heats up significantly.

• The mixture remains at room temperature.

• The mixture cools down significantly.

• The mixture produces a bright light.