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05: differentiate between (a) true solution & a colloid (b) metals & non-metals (c) compound and mixtures (d) physical & chemical changes​

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True solution
  • True solutions are the mixtures in which the solute and the solvent mix properly in the liquid phase.
  • The size of the particles is less than 1nm.
  • It is a homogenous solution.
Colloid
  • Colloidal solutions are the mixtures in which the solute is uniformly distributed in the solvent.
  • The size of the particles is 1-1000nm.
  • It is a heterogeneous solution.
Metals
  • Metals are malleable and ductile.
  • Metals are good conductors of heat and electricity.
  • Metals are strong and tough.
Non-Metals
  • Non- metals are brittle (break easily). They are neither malleable nor ductile.
  • Non-metals are bad conductors of heat and electricity. Except for graphite which is a good conduction of electricity.
  • Non-metals are not strong or tough.
Physical changes
  • When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.
  • Physical change is a temporary change.
  • In a physical change, no new substance is formed.
Chemical Change
  • When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.
  • A chemical change is a permanent change.
  • A chemical change is always accompanied by one or more new substances.

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