Endo Vs EXO Reactions Quiz: Test Your Knowledge!

  • AP Chem
  • IB Chem
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| Attempts: 6,306 | Questions: 10 | Updated: Oct 28, 2025
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1. 6CO2   +    6H2O    à  C6H12O6    +  6O2    ∆H  =  +2803 kJ  

Explanation

The given chemical equation represents the process of photosynthesis, where carbon dioxide (CO2) and water (H2O) are converted into glucose (C6H12O6) and oxygen (O2) in the presence of sunlight. The positive value of ∆H (+2803 kJ) indicates that energy is absorbed or taken in during this reaction. This means that the reaction requires an input of energy in order to proceed, making it endothermic.

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About This Quiz
Endo Vs EXO Reactions Quiz: Test Your Knowledge! - Quiz

Endothermic and Exothermic are chemical reactions that absorb and release heat. An example of an endothermic reaction is photosynthesis. An exemplar of an exothermic reaction is combustion. Specifically, exothermic reactions are those in which heat is given out, while with endothermic reactions, heat is taken in. For this quiz, you... see morewill be provided with chemical formulas, and it is up to you to determine its type of reaction. Stay cool and don’t overheat; you will ACE this quiz. see less

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2. 3NO2 +   H2O  à  2HNO3   +  NO  ∆H  =  - 138 kJ  

Explanation

The given reaction releases heat energy (-138 kJ), which indicates that it is exothermic. In an exothermic reaction, the products have lower energy than the reactants, and the excess energy is released as heat.

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3. C6H12O6    +  6O2   à  6CO2   +    6H2O    ∆H  =  -2803 kJ  

Explanation

The given chemical equation represents the process of cellular respiration, where glucose (C6H12O6) is oxidized to produce carbon dioxide (CO2) and water (H2O) while releasing energy. The negative value of ∆H (-2803 kJ) indicates that the reaction is exothermic, meaning it releases heat energy into the surroundings. Therefore, the correct answer is "Exothermic."

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4.

Explanation

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5. N2(g) + O2(g) + 43 kcal -----> 2 NO(g)

Explanation

The given reaction involves the formation of nitrogen monoxide (NO) from nitrogen gas (N2) and oxygen gas (O2) with the absorption of 43 kcal of energy. This indicates that the reaction requires an input of energy to occur, making it endothermic.

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6. Which of the following statements correctly describes an endothermic or exothermic reaction?

Explanation



An endothermic reaction absorbs heat from the surroundings, which causes the temperature of the surroundings to decrease. This is because the reaction requires energy input to proceed. In contrast, an exothermic reaction releases heat into the surroundings, increasing the temperature. Understanding this difference helps in identifying the type of reaction based on energy exchange with the surroundings.
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7. C3H8(g) + 5 O2(g) à 3 CO2(g) + 4H2O(g) + 2200 kJ 

Explanation

The given chemical equation represents the combustion of propane (C3H8) in the presence of oxygen (O2) to produce carbon dioxide (CO2) and water (H2O), along with the release of 2200 kJ of energy. In an exothermic reaction, energy is released in the form of heat, which is indicated by the negative sign of the enthalpy change (ΔH). Since the equation shows the release of energy (2200 kJ), it suggests that the reaction is exothermic.

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8. CH4 + 2 O2 --> CO2 + 2 H20 + 213.2 KJ

Explanation

The given balanced chemical equation shows that the reaction of methane (CH4) with oxygen (O2) produces carbon dioxide (CO2) and water (H2O) along with the release of 213.2 KJ of energy. This indicates that the reaction is exothermic because it releases heat or energy to the surroundings.

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9. If a reaction finishes with more energy than it started, it must be a

Explanation

An endothermic reaction absorbs energy from its surroundings, resulting in a net gain of energy. This means the products of the reaction have more energy than the reactants. Endothermic reactions often feel cold to the touch as they take in heat from their environment. Common examples include photosynthesis in plants and the melting of ice into water.

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10. Which of the following statements correctly describes an endothermic reaction?

Explanation



An endothermic reaction is characterized by the absorption of heat from the surroundings, which often leads to a decrease in the surrounding temperature. This is because the system (the reaction) needs to absorb energy in the form of heat to proceed, thus drawing heat from the environment, which is felt as a cooling effect. Conversely, exothermic reactions release heat, increasing the temperature of the surroundings. Option B is the correct description of an endothermic reaction.
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6CO2   +    6H2O   ...
3NO2 +   H2O  à  2HNO3   + ...
C6H12O6    +  6O2   à ...
N2(g) + O2(g) + 43 kcal -----> 2 NO(g)
Which of the following statements correctly describes an endothermic...
C3H8(g) + 5 O2(g) à 3 CO2(g) + 4H2O(g) + 2200 kJ 
CH4 + 2 O2 --> CO2 + 2 H20 + 213.2 KJ
If a reaction finishes with more energy than it started, it must be a
Which of the following statements correctly describes an endothermic...
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