4.3.1 P1 Changes of State and Particle Model (will come up) Flashcards
What is the definition of density
The mass per unit volume of a material
What are the units of density
kg/m3
or
g/cm3
State the different states of matter in order (least to most) of density of atoms
Least: Gas
Liquid
Most: Solid
Describe the particle arrangement of a solid
Tightly packed in a regular arrangement
Particles can only vibrate around a fixed position
Describe the particle arrangement of a liquid
Close together but with an irregular arrangement
They can flow over each other
Describe the particle arrangement of a gas
Separated with no regular arrangement
Particles can move freely
What is always conserved when a substance undergoes a change of state
Mass
How does a change of state differ from a chemical change
In a change of state the material can return to having its previous properties if the change is reversed
What is sublimation
When a solid changes into a gas without passing through a liquid state
What is evaporation
When a liquid changes into a gas state
What is the opposite of evaporation
Condensation when a gas changes into a liquid state
When water boils in an open pan why does the mass of the pan of water appear to decrease
Some of the water will evaporate and turn into water vapour
This will leave the pan meaning the mass of the pan will decrease
The mass of the whole system however remains constant
Explain the processes involved when a bathroom mirror mists up
Hot water evaporates to form water vapour
This water vapour lands on the cooler mirror
The vapour condenses and returns to liquid state on the mirror’s surface
