
Honors Chem Review Hess' Law
Flashcard
•
Chemistry
•
12th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is Hess' Law?
Back
Hess' Law states that the total enthalpy change for a reaction is the same, regardless of the number of steps the reaction takes. It is based on the principle of conservation of energy.
2.
FLASHCARD QUESTION
Front
What is the formula for calculating enthalpy change (∆H)?
Back
∆H = H(products) - H(reactants), where H is the enthalpy of the substances involved.
3.
FLASHCARD QUESTION
Front
What does a negative ∆H value indicate?
Back
A negative ∆H value indicates that the reaction is exothermic, meaning it releases heat to the surroundings.
4.
FLASHCARD QUESTION
Front
What does a positive ∆H value indicate?
Back
A positive ∆H value indicates that the reaction is endothermic, meaning it absorbs heat from the surroundings.
5.
FLASHCARD QUESTION
Front
How can Hess' Law be applied to calculate ∆H for a reaction?
Back
By using known enthalpy changes of related reactions, you can add or subtract these values to find the ∆H for the desired reaction.
6.
FLASHCARD QUESTION
Front
What is the enthalpy change for the formation of water (H2O) from hydrogen and oxygen?
Back
The enthalpy change (∆H) for the reaction H2(g) + 1/2 O2(g) → H2O(g) is -242 kJ.
7.
FLASHCARD QUESTION
Front
What is the enthalpy change for the combustion of magnesium?
Back
The enthalpy change (∆H) for the reaction Mg(s) + 1/2 O2(g) → MgO(s) is -602 kJ.
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