Chemical Changes Lab

Everywhere

• Topic tabs (under the title) switch between simulations in this lab. Some topics have smaller buttons under the stage for their screens.
• Teach shows live equations with the current numbers and "What to notice" points. Practice gives a numeric problem and a quiz.
• Move the sliders or tap the chips in the right-hand panel. The readings box updates live.
• Pause / Restart control the animation. Clean view hides everything except the stage, for projecting or recording; press Esc to leave it.
• In Practice, type a number (e.g. 12.5 or 3.2e-10), press Check or Enter. Show it on the stage sets the simulation to that problem.
• Nothing is saved: scores reset when the page is reloaded.

Four topics along the top

• Reaction rate: Collision theory; Maxwell–Boltzmann & Arrhenius; Energy profile.
• Chemical equilibrium: Dynamic equilibrium; Le Chatelier: Haber process; Kc and Kp.
• Acids, bases & pH: pH scale & indicators; Strong and weak acids; Buffer solution.
• Heat of reaction: Heat of neutralisation; Hess's law.

Teach and Practice

• Teach shows the equations with your numbers and notes for each view. Practice gives a numerical problem for the current view — Check the answer, Show it on the stage, or ask for a New problem — plus a quick-check quiz.

Language

• Choose English or বাংলা once on the home page (top right); every lab then opens in that language — tabs, controls, readings, equations, notes, problems and quizzes.

Full guide with teaching tips: User manual (also as a PDF).