Lesson 6 CHEM - The Temperature Curve and The Phase Changes of Water and CO2 Flashcards
A gas or a liquid; a substance that can flow
FLUID
A homogeneous part of a system in contact with other parts of the system, but separated by well-defined boundaries
PHASE
A phase of matter with definite shape and volume
SOLID
A phase of matter with definite volume but no definite shape
LIQUID
A phase of matter with no definite shape or volume of its own
GAS
Attractive forces between molecules
- Intermolecular forces
Transformations of matter from one phase to another
PHASE CHANGES
Process that gives OFF or release heat to the surroundings
Exothermic process
Process that ABSORBS heat from the surroundings
- Endothermic process
The amount of heat needed to raise the temperature of 1 gram of a substance by 1 OC
- Specific heat of a substance
occur when energy (usually in the form of heat) is added or removed from a substance
PHASE CHANGES
3 Endothermic processes
- MELTING S TO L
- SUBLIMATION S - G
- VAPORIZATION L - G
3 Exothermic processes
- FREEZING L-S
- DEPOSITION G-S
- CONDENSATION G-L
When heat change is accompanied by a change in temperature, a change in kinetic energies of the particles in the substance is occurring. The particles are either moving faster or slowing down.
When temperature remains constant during heat change, the particles move at the same speed. The heat added or removed is involved in breaking or forming attractive forces.
Heating and Cooling curve
A graphical representation of the physical states of a substance under different conditions of temperature and pressure
PHASE DIAGRAM
