Which of the following statements correctly describes an endothermic reaction?

The reaction absorbs heat, decreasing the temperature of the surroundings.

The reaction releases heat, making the surroundings warmer.

Endothermic And Exothermic Chemical Reactions! Trivia Quiz

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Endothermic And Exothermic Chemical Reactions! Trivia Quiz - 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 will 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.

Questions and Answers

1.

C₆H₁₂O₆ + 6O₂ à 6CO₂ + 6H₂O ∆H = -2803 kJ
- A.
  
  Exothermic
- B.
  
  Endothermic
Correct Answer
A. Exothermic

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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2.

6CO₂ + 6H₂O à C₆H₁₂O₆ + 6O₂ ∆H = +2803 kJ
- A.
  
  Exothermic
- B.
  
  Endothermic
Correct Answer
B. Endothermic

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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3.

3NO₂ + H₂O à 2HNO₃ + NO ∆H = - 138 kJ
- A.
  
  Exothermic
- B.
  
  Endothermic
Correct Answer
A. Exothermic

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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4.

Which of the following statements correctly describes an endothermic reaction?
- A.
  
  The reaction releases heat, making the surroundings warmer.
- B.
  
  The reaction absorbs heat, decreasing the temperature of the surroundings.
Correct Answer
B. The reaction absorbs heat, decreasing the temperature of the surroundings.

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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5.

CH4 + 2 O2 --> CO2 + 2 H20 + 213.2 KJ
- A.
  
  Exothermic
- B.
  
  Endothermic
Correct Answer
A. Exothermic

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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6.

N_2(g) + O_2(g) + 43 kcal -----> 2 NO_(g)
- A.
  
  Exothermic
- B.
  
  Endothermic
Correct Answer
B. Endothermic

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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7.
- A.
  
  Exothermic
- B.
  
  Endothermic
Correct Answer
B. Endothermic
8.

C3H8_(g) + 5 O2_(g) à 3 CO2_(g) + 4H2O_(g) + 2200 kJ
- A.
  
  Exothermic
- B.
  
  Endothermic
Correct Answer
A. Exothermic

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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9.
- A.
  
  Exothermic
- B.
  
  Endothermic
Correct Answer
A. Exothermic
10.

If a reaction finishes with more energy than it started, it must be a
- A.
  
  Exothermic
- B.
  
  Endothermic
Correct Answer
A. Exothermic

Explanation
If a reaction finishes with more energy than it started, it must be exothermic. This is because exothermic reactions release energy in the form of heat or light. So, if the reaction has more energy at the end, it means that energy was released during the reaction, making it exothermic. On the other hand, endothermic reactions absorb energy from the surroundings, resulting in a decrease in energy.

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Apr 17, 2024

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Dec 09, 2014

Quiz Created by
Hopchemistry

Endothermic And Exothermic Chemical Reactions! Trivia Quiz

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

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

3NO2 + H2O à 2HNO3 + NO ∆H = - 138 kJ

Which of the following statements correctly describes an endothermic reaction?

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

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

C3H8(g) + 5 O2(g) à 3 CO2(g) + 4H2O(g) + 2200 kJ

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

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

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

3NO₂ + H₂O à 2HNO₃ + NO ∆H = - 138 kJ

N_2(g) + O_2(g) + 43 kcal -----> 2 NO_(g)

C3H8_(g) + 5 O2_(g) à 3 CO2_(g) + 4H2O_(g) + 2200 kJ