Step 3 · Choose a topic · Class 8

Chemistry

Explore matter, atoms, reactions and the periodic table.

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Your suggested learning path

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Explore → practise → quiz → revise. Earlier topics are recommended preparation; every topic stays open.

Start here: Inside a state of matter →

Category3 of 3 topics

01Matter

Inside a state of matter

Suggested-level exploration

Compare idealised particle arrangements in a solid, a liquid and a gas. Particles vibrate around sites in the solid; the liquid is close-packed but mobile; the gas spreads through the container. Motion is schematic, not a temperature or collision calculation.

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02Mixtures

Solution concentration

Suggested-level exploration

Mass percent compares solute mass with the total mass of a solution. Adjust solute and solvent independently. This model assumes the solute dissolves completely; colour is only a visual guide.

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03Shared reference

Periodic table

Shared reference

Select elements, compare groups and periods, then test your understanding in the element quest.

Interactive explainer 3-round quiz

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