Topic 3- Changes of state and Particle Model Flashcards
What is the definition of density
The mass per unit volume of a material
What is the equation for density and state the units
d = M/V
Density = kg/m^3
Mass = kg
Volume = m^3
State the different states of matter in order of density of atoms
Least dense: gas
liquid
most dense: solid
Describe the particle arrangement of a solid
Tightly packed in a regular arrangement, particles can only vibrate on the spot
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 changed into a gas without pass through a liquid state
What is evaporation
when a liquid changes into a gas state
What id the opposite of evaporation
condensation, which is 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.