3. Physical Chemistry Flashcards
(11 cards)
What is an exothermic reaction?
A reaction that releases heat energy.
What is an endothermic reaction?
A reaction that absorbs heat energy.
How is calorimetry used?
To measure temperature change during reactions like combustion or neutralization.
How is heat energy change calculated?
Q = mcΔT (mass × specific heat capacity × temperature change).
How to calculate molar enthalpy change (ΔH)?
ΔH = Q / mol of substance.
What factors affect reaction rates?
- Surface area
- Concentration
- Temperature
- Catalysts.
How does increasing surface area affect rate?
It increases the rate.
How do catalysts work?
They provide an alternative pathway with lower activation energy.
What indicates a reversible reaction?
The use of the ⇌ symbol.
What is a hydrocarbon?
A compound made of hydrogen and carbon only.
Example of reversible reaction?
Dehydration of hydrated copper sulfate or heating ammonium chloride.
