Multiple Choice
Which of the following reactions is an endergonic reaction?
8. Thermochemistry
Endothermic & Exothermic Reactions
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In which of the following scenarios is chemical energy being transformed into thermal energy?
A
A solar panel converting sunlight into electricity
B
A wind turbine generating electricity
C
A piece of wood burning in a fireplace
D
A battery powering a flashlight
Verified step by step guidance1
Understand the concept of chemical energy: Chemical energy is stored in the bonds of chemical compounds, like atoms and molecules. It is released in a chemical reaction, often producing heat as a by-product.
Recognize the transformation of energy: When chemical energy is transformed into thermal energy, it typically involves a chemical reaction that releases heat.
Identify the scenario involving a chemical reaction: Among the given options, a piece of wood burning in a fireplace involves a chemical reaction known as combustion.
Explain combustion: Combustion is a chemical process where a substance reacts with oxygen to release energy in the form of heat and light. In the case of wood burning, the chemical energy stored in the wood is converted into thermal energy.
Conclude the transformation: Therefore, the scenario where a piece of wood burns in a fireplace is an example of chemical energy being transformed into thermal energy.
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