
Hess's law flashcard
Flashcard
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is Hess's Law?
Back
Hess's Law states that the total enthalpy change for a reaction is the same, regardless of the number of steps the reaction takes.
2.
FLASHCARD QUESTION
Front
Define an endothermic reaction.
Back
An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, resulting in a positive enthalpy change (∆H > 0).
3.
FLASHCARD QUESTION
Front
What is an exothermic reaction?
Back
An exothermic reaction is a chemical reaction that releases energy to its surroundings, resulting in a negative enthalpy change (∆H < 0).
4.
FLASHCARD QUESTION
Front
How do you calculate the enthalpy change for a reaction using Hess's Law?
Back
To calculate the enthalpy change, sum the enthalpy changes of the individual steps of the reaction.
5.
FLASHCARD QUESTION
Front
What is the enthalpy change (∆H) for the combustion of 1 mole of CH4(g)?
Back
The enthalpy change for the combustion of 1 mole of CH4(g) is -890 kJ.
6.
FLASHCARD QUESTION
Front
If the enthalpy change for a reaction is +68 kJ, what is the ∆H for the reverse reaction?
Back
The ∆H for the reverse reaction is -68 kJ.
7.
FLASHCARD QUESTION
Front
What does a negative ∆H value indicate about a reaction?
Back
A negative ∆H value indicates that the reaction is exothermic, meaning it releases heat.
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