Endothermic and Exothermic Reactions
Flashcard
•
Science
•
6th - 8th Grade
•
Hard
Barbara White
FREE Resource
Student preview
16 questions
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1.
FLASHCARD QUESTION
Front
Exothermic Reaction Noun
[ek-so-thur-mik ree-ak-shun]
Back
Exothermic Reaction
A chemical reaction that releases energy from the system to the surroundings, usually in the form of heat or light.
Example: Burning wood is a combustion reaction where fuel (hydrocarbon) and oxygen react to produce carbon dioxide, water, and release energy as heat and light.
2.
FLASHCARD QUESTION
Front
Endothermic Reaction Noun
[en-do-thur-mik ree-ak-shun]
Back
Endothermic Reaction
A chemical reaction that absorbs energy from its surroundings, causing a drop in the temperature of the immediate environment.
Example: This diagram shows an instant cold pack's contents. When the inner water bag breaks, it mixes with ammonium nitrate, absorbing heat and making the pack cold.
3.
FLASHCARD QUESTION
Front
Enthalpy Noun
[en-thal-pee]
Back
Enthalpy
A thermodynamic quantity equivalent to the total heat content of a system, representing the energy available as heat.
Example: This icon shows energy (arrows) moving into a chemical system (test tube), representing an endothermic reaction where the system's enthalpy increases.
4.
FLASHCARD QUESTION
Front
Enthalpy Change (ΔH) Noun
[en-thal-pee cheynj]
Back
Enthalpy Change (ΔH)
The measure of the overall change in heat energy of a chemical system during a reaction at constant pressure.
Example: This diagram shows an endothermic reaction, where the products have higher enthalpy (energy) than the reactants, resulting in a positive enthalpy change (+ΔH).
5.
FLASHCARD QUESTION
Front
System Noun
[sis-tuhm]
Back
System
In chemistry, the specific portion of the universe being studied, such as the reactants and products in a reaction.
Example: This diagram shows a 'system' (the area of interest), its 'surroundings' (everything outside), and the 'boundary' that separates them, where energy exchange occurs.
6.
FLASHCARD QUESTION
Front
Surroundings Noun
[suh-roun-dingz]
Back
Surroundings
Everything in the universe that is not part of the system being studied and can exchange energy with it.
Example: This diagram shows that the 'surroundings' is everything outside a defined 'system,' separated by a 'boundary.' Energy can be exchanged between the system and its surroundings.
7.
FLASHCARD QUESTION
Front
Reactants Noun
[ree-ak-tuhnts]
Back
Reactants
The initial substances that enter into and are altered during the course of a chemical reaction.
Example: This diagram shows that reactants, like methane (CH₄) and oxygen (O₂), are the starting materials on the left side of a chemical reaction.
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