Lesson 3. Flashcards
What are the smallest particles?
Atoms.
How big is a helium atom’s diameter?
62pm- (62 x 10^-12m).
What is the distance between two helium atoms in the gas state?
That distance is 55 times larger than the helium atom’s diameter.
How do you calculate the space between atoms?
The ratio of distance to diameter:
distance between atoms/diameter of atoms.
What are the attractive forces between particles?
Electrostatic forces that are strongest in solids and weakest in gases.
What are the limitations of the particle model?
It does not take into account the forces between particles, the sizes of particles and the space between particles.
Why does the volume of a substance increase when something melts?
Some of the forces of attraction are overcome, and particles can now move around each other.
TRUE OR FALSE:
In the particle model, collisions are inelastic.
True.
Define “inelastic.”
When energy is transferred from the particles to the surroundings during particle collisions.
TRUE OR FALSE:
In reality, particle collisions are elastic.
True.
Define “elastic.”
When energy is not transferred to the surroundings during particle collisions.
