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🥤 Dissolving and Solutions

Watch sugar vanish into water and discover the science of solutes, solvents, and solutions — plus why some things simply won't dissolve.

3
lessons
~15 min
to learn
🔬 Science
subject
Ages 6–12
level
Start the course →

What you’ll learn

  1. The Disappearing TrickUnderstand that dissolving spreads a solid into tiny pieces through a liquid, and that warmth and stirring speed it up.When a solid dissolves, it breaks into pieces too small to see and spreads evenly through a liquid. It only seems to disappear — you can still taste it. Warm water and stirring help solids dissolve faster.
  2. Solute, Solvent, SolutionName the solute, solvent, and solution and give everyday examples of each.The solid that dissolves is the solute, the liquid it dissolves into is the solvent, and together they make a solution. Water is the most common solvent. Sweet tea and sea water are everyday solutions.
  3. What Won't DissolveTell soluble from insoluble materials, and recover a dissolved solute by evaporation.Soluble things like sugar and salt dissolve, but insoluble things like sand and chalk stay whole and settle out. Dissolving is reversible: evaporate the water and the solute is left behind as crystals.

Questions this course answers

When sugar dissolves in water, what really happens to it?

Dissolving breaks the sugar into pieces so tiny they spread through the water and seem to vanish, but the sugar is still there.

Which of these makes sugar dissolve faster?

Warm water and stirring both help, because the water pieces move faster and keep jostling the sugar apart.

In salty water, what is the solvent?

The solvent is the liquid that does the dissolving — here that is the water. The salt is the solute.

What do we call a solute and solvent mixed evenly together?

A solute dissolved evenly in a solvent is called a solution — clear and the same all the way through.

Which of these will NOT dissolve in water?

Sand is insoluble — its grains stay whole and sink to the bottom instead of dissolving.

How can you get salt back out of salty water?

Dissolving is reversible. When the water evaporates, it floats away as vapour and leaves the salt behind as crystals.

Grounded in trusted sources

  • Royal Society of Chemistry
  • BBC Bitesize
  • Britannica Kids
  • American Chemical Society

Every Wunder lesson is built from real, reputable sources — never invented.

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