Topic 3 Internal Energy And Changes Of State Flashcards
What does it mean if particles in a system move or vibrate
They have kinetic energy in their store
What is the energy stored in a system stored by
It’s particles
What is the internal energy of a system
The total energy that it’s particles have in their kinetic and potential energy stores
Heating the system transfers energy into the particle increasing the
Internal energy store
If the temperatures changes what does the size of the change depend on
The mass of the substance
What it is made of
The energy input
When does a change occur
If a substance is heated enough for their kinetic energy stores to break the bonds holding the particles together
Solid to gas
Sublimation
Gas to solid
Deposition
Why are masses conserved in state changes
Still the same number of particles just arranged differently
Why is the change of state physical rather than chemical
It’s the same substance you started with just in a different form
When does a change in state occur
If the substance has enough kinetic energy stores to break the bonds holding them together
What does heating the system transfer the energy to
To its particles increasing the internal energy
What is the internal energy of a system
Total energy that it’s particles have in their kinetic and potential energy stores
What is a change of state
A physical change that means you don’t need up with a different substance just a substance in a different form
What a happens if you reverse a change of state
The substance will return to its original form and gain back its original properties
