Podcast
Questions and Answers
What process do plants use to store chemical energy?
What process do plants use to store chemical energy?
- Respiration
- Photosynthesis (correct)
- Combustion
- Fermentation
What occurs during an endothermic reaction?
What occurs during an endothermic reaction?
- More energy is absorbed than is released (correct)
- More energy is released than is absorbed
- Bonds are broken and energy is released
- Energy remains constant
Which statement is true regarding the energy transformation in batteries?
Which statement is true regarding the energy transformation in batteries?
- They transform electrical energy into chemical energy
- They store mechanical energy
- They require energy input to function
- They release stored chemical energy as electricity (correct)
What is the main reaction that occurs in hand warmers?
What is the main reaction that occurs in hand warmers?
Why is the combustion of petroleum considered an exothermic reaction?
Why is the combustion of petroleum considered an exothermic reaction?
Which of the following is a characteristic of endothermic reactions?
Which of the following is a characteristic of endothermic reactions?
Which component in an ice pack triggers the endothermic reaction?
Which component in an ice pack triggers the endothermic reaction?
What type of energy does chemical energy fall under?
What type of energy does chemical energy fall under?
Which statement describes an exothermic reaction correctly?
Which statement describes an exothermic reaction correctly?
What happens to propane in the presence of oxygen at high temperatures?
What happens to propane in the presence of oxygen at high temperatures?
Which of the following examples represents chemical energy?
Which of the following examples represents chemical energy?
Why is propane considered a useful source of chemical energy?
Why is propane considered a useful source of chemical energy?
In the process of breaking and forming bonds in a chemical reaction, what is required to break bonds?
In the process of breaking and forming bonds in a chemical reaction, what is required to break bonds?
Which of the following reactions is NOT an example of an exothermic reaction?
Which of the following reactions is NOT an example of an exothermic reaction?
What is a consequence of the energy transformation during an exothermic reaction?
What is a consequence of the energy transformation during an exothermic reaction?
Flashcards
Endothermic Reaction
Endothermic Reaction
A chemical reaction that absorbs more energy than it releases.
Exothermic Reaction
Exothermic Reaction
A chemical reaction that releases more energy than it absorbs.
Photosynthesis
Photosynthesis
The process by which plants use sunlight to convert carbon dioxide and water into glucose.
Fossil Fuels
Fossil Fuels
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Chemical Energy
Chemical Energy
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Battery
Battery
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Combustion
Combustion
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Chemical Energy
Chemical Energy
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Potential Energy
Potential Energy
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Kinetic Energy
Kinetic Energy
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Exothermic Reaction
Exothermic Reaction
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Breaking Bonds
Breaking Bonds
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Forming Bonds
Forming Bonds
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Propane Combustion
Propane Combustion
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Chemical Energy Source
Chemical Energy Source
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Study Notes
Chemical Energy Definition
- Chemical energy is energy stored within the bonds of chemical compounds.
- Examples include batteries, gasoline, coal, and food.
- Classified as potential energy, not kinetic energy.
How Chemical Energy Works
- Breaking chemical bonds requires energy. Forming new bonds releases energy.
- Chemical transformations involve understanding the chemistry of the substances involved.
Propane Combustion Example
- Propane (a molecule made of carbon and hydrogen) has chemical energy.
- Combustion involves heat; atoms vibrate and move rapidly.
- Propane molecules break apart, reforming into carbon dioxide and water.
- The energy released from forming new bonds is greater than the energy required to break the original bonds.
- This is an exothermic reaction (releases more energy than it consumes).
- Balanced reaction example provided showing propane combustion.
Exothermic vs. Endothermic Reactions
- Exothermic: Reactions release more energy than they absorb.
- Examples include propane combustion, burning wood, gasoline combustion, and decomposing food.
- Endothermic: Reactions absorb more energy than they release.
- Energy is taken from the system.
- Example: disposable ice packs (ammonium nitrate and water reaction)
Chemical Energy Examples and Applications
- Photosynthesis:
- Plants store chemical energy through endothermic reactions.
- Collects carbon dioxide and water, reformats them into glucose, and releases oxygen (Photosynthesis)
- Energy required comes from the sun.
- Petroleum:
- Fossil fuels (petroleum) store energy from ancient organisms.
- Combustion reaction is exothermic (releases more energy).
- Products are carbon dioxide and water.
- Food:
- Energy in food (chemical energy) originates from the sun.
- Energy from converting food is used to power the body.
- The digestion process (breaking and forming bonds) is exothermic.
- Batteries:
- Store chemical energy to produce electricity.
- Electrolytes and metals react, liberating electrons.
- Electrons flow through a wire (electricity).
- Hand Warmers:
- Contain iron powder, water, salt, and absorbent material.
- Exothermic reaction produces heat when exposed to air.
- Iron reacts with oxygen (forming rust) to generate heat.
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Description
This quiz covers the fundamentals of chemical energy, including its definition, how it works, and the differences between exothermic and endothermic reactions. You'll explore examples such as propane combustion to understand energy transformations in chemical processes.
