Physical Change Is a Change In Shape or Appearance Flashcards
Are physical changes reversible?
Most are.
Give an example of a reversible physical change.
Ice to water.
What occurs within a physical change?
The substance consist of the same particles the arrangement is just different.
What is the main difference within physical changes?
The main difference is how the particles are packed and how much kinetic energy they have.
When it is hotter, do particles move faster or slower?
Faster.
Are molecules constantly vibrating?
Yes, it’s just a matter of how fast they vibrate.
What causes particles to vibrate fast?
Heat energy
How do particles manage to stay in place even when they are vibrating intensely?
The surrounding particles keep them in place.
What happens eventually when the particles gain alot of energy?
They end up breaking free.
What is dry ice?
Solidified carbon dioxide.
What is vaporisation?
Vaporisation is the physical change of a liquid or solid converting into a gas.
What is a volatile substance?
A substance that evaporates to become a gas at room temperature.
Give an example of a volatile substance.
Petrol.
When does vaporisation occur?
When a solid or liquid reaches boiling point.
What degree is boiling point?
100 degrees celsius.
