Exothermic and Endothermic Reactions
Chemistry ⇒ Chemical Reactions and Equations
Exothermic and Endothermic Reactions starts at 8 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Exothermic and Endothermic Reactions.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
A chemical reaction absorbs 50 kJ of heat from the surroundings. Is this reaction exothermic or endothermic?
A chemical reaction has ΔH = +75 kJ/mol. Is this reaction exothermic or endothermic?
A reaction has ΔH = -120 kJ/mol. What does the negative sign indicate about the reaction?
A student mixes barium hydroxide and ammonium chloride in a beaker. The beaker becomes very cold. What type of reaction is this?
A chemical reaction absorbs 50 kJ of heat from the surroundings. Is this reaction exothermic or endothermic?
A chemical reaction has ΔH = +75 kJ/mol. Is this reaction exothermic or endothermic?
A reaction has ΔH = -120 kJ/mol. What does the negative sign indicate about the reaction?
A student mixes barium hydroxide and ammonium chloride in a beaker. The beaker becomes very cold. What type of reaction is this?
Which of the following best describes the energy profile of an exothermic reaction?
(1) Products have higher energy than reactants
(2) Reactants have higher energy than products
(3) Both have the same energy
(4) Energy remains constant throughout
Which of the following is a characteristic of endothermic reactions?
(1) Release of heat
(2) Absorption of heat
(3) Decrease in temperature of surroundings
(4) Both 2 and 3
Which of the following is an example of an endothermic reaction?
(1) Burning of magnesium ribbon
(2) Decomposition of silver chloride in sunlight
(3) Neutralization of HCl and NaOH
(4) Condensation of water vapor
Which of the following is an exothermic process?
(1) Boiling of water
(2) Respiration
(3) Photosynthesis
(4) Melting of ice
Fill in the blank: In an exothermic reaction, energy is ________ to the surroundings.
Fill in the blank: The process of condensation is ________ (exothermic/endothermic).
Fill in the blank: The process of dissolving ammonium chloride in water is an example of an ________ reaction.
Fill in the blank: The process of evaporation is an ________ process.
True or False: All decomposition reactions are endothermic.
True or False: In an endothermic reaction, the products have higher enthalpy than the reactants.
True or False: The enthalpy change (ΔH) for an endothermic reaction is positive.
True or False: The process of dissolving sodium hydroxide in water is exothermic.
