Concepts
What does calorimetry measure?
Heat
Formula for heat
q=mcΔT
Water, 100 g, 20→25°C
2092 J
Temp increases → ΔH?
Negative
What happens to heat in a system?
It is transfered
Unit of heat
Joules (J)
Water, 50 g, 30→20°C
−2092 J
Temp decreases → ΔH?
Positive
What is ΔH?
Change in enthalpy (heat)
Formula for ΔT
T final − T initial
Water, 200 g, 25→30°C
4184 J
Heat released → ΔH?
Negative
What does exothermic mean?
Heat is released
Specific heat of water
4.184 J/g°C
Water, 150 g, 40→35°C
−3138 J
Heat absorbed → ΔH?
Positive
What does endothermic mean?
Heat is absorbed
Calorimetry relationship between ΔH and q
ΔH=−q
Water, 120 g, 20→30°C
5020.8 J
Water heats up → reaction type?
Exothermic