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.
What happens when water is heated to its boiling point?
It starts to vaporise and it quickly gains kinetic energy.
What is condensation?
The physical change of a gas converting into a liquid.
Give an example of condensation.
When air condenses on a cold surface.
What is melting?
When a solid converts into a liquid due to heat energy.
What is solidification?
What a gas or liquid converts into a solid.
What is sublimation?
Conversion of solid to gas.
What is deposition?
Conversion of gas to solid.
Give an example of sublimation.
Dry ice, it is converted from gas to solid.
What is a biopolymer?
A polymer made from living things.
