Changes Of A State And Particle Model Flashcards
What is the definition of Density? State with the relevent equation.
The mass per unit volume of a material. p=mv.
State the different states of matter in order - least to most - of density atoms.
gas, liquid, solid
Describe the particle arrangement of a solid.
Tightly packed in a regular arrangement. Particles can vibrate only on the spot.
Describe the particle arrangement of a liquid.
Close together, but with an irregular pattern. They can flow over each other.
Describe the particle arrangement in a gas.
Separated, with no regular arrangement. Particles can move freely.
What is always conserved when a substance undergoes a change in 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.
What is evaporation?
When a liquid changes into a gas state.
What is 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 disappear?
Some of the water will evaporate and turn into water vapour. This will leave the pan meaning the mass of the pan will decrease.
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.
