Thermochem Basics
Thermochemistry is primarily concerned with this.
Energy Changes
Heat Transfer
Heat always flows from this to this.
hot to cold
A flat section on a heating curve represents this.
phase change
This equation calculates heat during a temperature change.
Q=mCΔT
This device is designed to prevent heat transfer with surroundings.
calorimeter
This type of energy is associated with motion.
kinetic
A reaction that absorbs heat is called this.
endothermic
During a phase change, this remains constant.
temperature
In the equation Q = mCΔT, this variable represents specific heat.
specific heat
Calorimetry is used to measure this.
heat flow
According to this law, energy cannot be created or destroyed.
Law of Conservation of Energy
A reaction that releases heat is called this.
exothermic
A sloped section of a heating curve represents this.
temperature change
A 20 g sample is heated by 5°C and has a specific heat of 2 J/g°C. Find Q.
200 J
The part of the universe being studied is called this.
system
Temperature is a measure of this.
molecular motion
For an exothermic reaction, ΔH has this type of value.
negative
The heat needed to melt 1 gram of a substance is called this.
heat of fusion
A 45 g iron sample heats from 22°C to 78°C. The specific heat is 0.46 J/g°C. Find the heat absorbed.
1159 J
What is the heat released when 1 mole burns completely?
heat of combustion
What is energy transferred due to a temperature difference?
Heat
Melting and vaporization are both examples of this type of process.
endothermic
When steam changes into liquid water, this phase change occurs.
condensation
A substance absorbs 3150 J of heat. Its mass is 25 g and ΔT = 30°C. Find the specific heat.
4.2 J/g°C
Calculate the heat released when 50 g of steam condenses if Hv = 2260 J/g.
113,000 J