Chemical Reactions Energy Quiz Form
Test your understanding of energy changes in chemical reactions. Answer all questions to the best of your ability.
Which of the following is an example of an exothermic reaction?
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Combustion of methane
Photosynthesis
Melting of ice
Evaporation of water
What term describes the minimum energy required for a reaction to occur?
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Activation energy
Enthalpy
Entropy
Catalysis
In an endothermic reaction, energy is:
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Absorbed from the surroundings
Released to the surroundings
Unchanged
Converted to mass
Which statement is true about exothermic reactions?
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They release heat.
Products have less energy than reactants.
They absorb energy.
They feel cold to the touch.
Match the reaction type to its energy change:
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Rows
Energy Absorbed
Energy Released
Photosynthesis
1
2
Combustion
3
4
Melting of ice
5
6
The enthalpy change (ΔH) for an exothermic reaction is:
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Negative
Positive
Zero
Variable
How confident are you in your answers so far?
1
2
3
4
5
Briefly explain what happens to the temperature of the surroundings during an exothermic reaction.
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Which of the following can lower the activation energy of a reaction?
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A catalyst
Increasing temperature
Adding more reactant
Decreasing pressure
Name one everyday example of an endothermic process.
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