C1.1.3 - Limitations of the Particle Model Flashcards
What are atoms?
The smallest particles that make up a substance
Which type of atoms are the smallest of all?
Helium atoms
What is the diameter of helium atoms?
62pm
Why is it difficult to draw particle diagrams of the gas state?
Because in reality they are so far apart
What are the forces between particles?
Attractive forces and electrostatic forces
What are attractive forces?
Electrostatic forces of attractions between positive and negative charges
What happens to the electrostatic forces when particles move further away from each other?
They become weaker
In which state is the electrostatic forces strongest?
Solid
In which state is the electrostatic forces weakest?
Gas
What are the limitations of the particle model?
The forces between particles
The size of particles
The space between particles
What happens to the volume of a substance when it melts?
It slightly increases
Why does the volume of a substance slightly increase when melting?
Some of the forces of attraction are overcome and the particles can move around each other
What happens to the volume of a liquid when it become a gas?
It increase greatly
