States Of Matter Flashcards
Since particles are always moving, what do they have?
Kinetic energy
At what temperature do particles cease having kinetic energy?
-273C,absolute zero
What is the spreading out of particles named?
Diffusion
In what states of matter does diffusion occur?
Gas and liquid
For the diffuse of gases experiment, ammonia and hydrogen chloride form what when they meet?
Solid ammonium chloride
In which way does diffusion occur?
High to low concentration
What affects the speed of diffusion?
Mass of gas/liquid
Is air a mixture, compound, or element?
Mixture
What causes a solid to melt?
The particles gain enough kinetic energy to overcome the weak intermolecular forces of attraction, this breaks the lattice structure
Why does the temperatures for a solid not increase when it is melting?
All of the energy is being used to break the bonds (between molecules)
What keeps solids and liquids in a relatively tight formation?
Weak intermolecular forces of attraction between molecules
What is evaporation?
Particles gaining enough energy to leave the surface of the liquid and form a vapour
What is boiling?
Gas bubbles forming at the body of the liquid
What is the boiling and melting point of a pure substance?
A fixed temperature under constant air pressure
Describe the movements of a solid particles
They vibrate on a fixed point
What is it called when a solid changes directly into a gas?
Subliming
Why does the temperature remain constant when freezing occurs?
As the process gives off heat, in order to create bonds which balances the temperature causing it to freeze
Do impurities in a liquid cause it to boil at a lower or higher temperature than the pure liquid?
Lower
What happens to most liquids when they are heated?
Expansion
Is H2 an element or a molecule?
Both
Describe the way which gas particles move
High to low concentration in a random way
Is the dissolving of a salt in water a chemical reaction?
No
