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Questions and Answers
What type of energy is chemical energy classified as?
What type of energy is chemical energy classified as?
What is the energy stored in, according to the definition of chemical energy?
What is the energy stored in, according to the definition of chemical energy?
What happens when bonds between atoms are broken?
What happens when bonds between atoms are broken?
What is the result of forming new bonds between atoms?
What is the result of forming new bonds between atoms?
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Why is propane a useful source of chemical energy?
Why is propane a useful source of chemical energy?
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What is necessary for the propane molecule to fall apart?
What is necessary for the propane molecule to fall apart?
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What is the resulting product when a propane molecule is broken down and reformed?
What is the resulting product when a propane molecule is broken down and reformed?
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What is the term for a reaction that releases more energy than it requires?
What is the term for a reaction that releases more energy than it requires?
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What is the net result of an endothermic reaction?
What is the net result of an endothermic reaction?
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What is the origin of the energy stored in plants?
What is the origin of the energy stored in plants?
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What is the byproduct of the combustion of petroleum?
What is the byproduct of the combustion of petroleum?
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What is the source of energy in food?
What is the source of energy in food?
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What is the result of digestion in the body?
What is the result of digestion in the body?
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What is the purpose of a battery?
What is the purpose of a battery?
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What is the process by which plants store energy from the Sun?
What is the process by which plants store energy from the Sun?
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Study Notes
Chemical Energy
- Chemical energy is defined as energy stored in the bonds of chemical compounds.
- Examples of chemical energy include alkaline batteries, gasoline, coal, and the foods we eat.
- Chemical energy is a form of potential energy, which is stored energy.
How Chemical Energy Works
- Breaking bonds between atoms requires energy, while forming new bonds releases energy.
- The energy released during the formation of new bonds is greater than the energy required to break the original bonds.
- This process is useful for extracting energy from chemical compounds.
Exothermic and Endothermic Reactions
- Exothermic reactions release more energy than they require, such as the combustion of propane, gasoline, and wood.
- Endothermic reactions require more energy than they release, such as the decomposition of food in a compost pile or the use of disposable ice packs.
Chemical Energy Examples
Photosynthesis
- Plants store chemical energy within their bodies through photosynthesis.
- During photosynthesis, carbon dioxide and water are broken down and reformed into glucose molecules, releasing oxygen as a waste product.
- Photosynthesis is an endothermic reaction, requiring energy from the Sun.
Petroleum
- Petroleum is a fossil fuel formed from ancient marine organisms like algae.
- The burning of fossil fuels is an exothermic reaction, releasing excess energy and producing carbon dioxide and water molecules.
Food
- The chemical energy in food can be traced back to the Sun.
- During digestion, the bonds in food are broken and new bonds form, releasing energy in an exothermic reaction.
Batteries
- Batteries store chemical energy and transform it into electricity.
- Chemical reactions occur between the metals and electrolytes in batteries, freeing electrons and producing electricity.
Hand Warmers
- Hand warmers produce an exothermic reaction, releasing excess heat.
- The reaction occurs when oxygen reacts with iron in the pouch, forming rust and releasing more energy than was required to break the bonds in the oxygen molecules.
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Description
Learn about chemical energy, its definition, and examples of substances that contain it, such as alkaline batteries, gasoline, coal, and even the food we eat.
