Chemical Reactions

By Chini Lahoti

Physical Change

How does it occur?

Change that occurs without changing the chemical composition

Evidence


  • Liquefaction
  • Solidification
  • Evaporation
  • Condensation
  • Sublimation

Examples

Ice Melting: When an ice melts, it is still made of the same components- H2O.


Shredding Paper: When the paper tears up, you can't make it a whole paper again, but the components are still the same for the paper.

Chemical Change

How does it occur?

Change that occurs that changes the chemical composition

Evidence

  • Color change
  • Heat
  • New Smell
  • Irreversible
  • Bubbles

Examples

Oxidation: When oxygen combines with a metal the chemical components change leaving proof in rust.


Baking: When you put the cake in the oven to cook, you're giving it thermal energy mixing all the different ingredients to have one outcome that's irreversible.

Vocab