Exploring Endothermic and Exothermic Reactions

What type of reaction occurs when hydrogen peroxide reacts with manganese dioxide?

• Isometric

• Endothermic

• Exothermic

• Neutral

What is the role of manganese dioxide in the reaction with hydrogen peroxide?

• Solvent

• Catalyst

• Product

• Reactant

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

• Speeds up the reaction without being consumed

• Decreases the reaction temperature

• Acts as a reactant

• Increases the reaction temperature

What happens to the temperature when salt is mixed with ice?

• Decreases significantly

• Remains the same

• First increases, then decreases

• Increases significantly

What type of reaction is demonstrated by mixing salt and ice?

• Neutralization

• Exothermic

• Endothermic

• Precipitation

Which of the following is true about endothermic reactions?

• They release heat to the surroundings

• They absorb heat from the surroundings

• They do not involve a change in temperature

• They always result in a decrease in entropy

What is the result of mixing hydrochloric acid with sodium hydroxide?

• Temperature decrease

• Temperature increase

• No change in temperature

• Formation of a solid

What type of reaction is observed when hydrochloric acid reacts with sodium hydroxide?

• Endothermic

• Exothermic

• Decomposition

• Neutralization

What happens to the temperature when ammonium chloride is dissolved in water?

• It remains constant

• It decreases

• It first decreases, then increases

• It increases

What type of reaction does ammonium chloride in water demonstrate?

• Neutralization

• Endothermic

• Exothermic

• Oxidation