Free Year 7 Science practice — conserve mass, calculate missing masses and explain open-system changes. No account needed.
Apply conservation of mass to selected reaction statements, whole-mass calculations and apparent changes in open systems. Correct answers can trigger celebrations. Feedback and retry options depend on the game.
Learning objective: Identify measured-system boundaries, complete supplied reactant and product mass calculations, and explain apparent mass changes when gases enter or leave.
Curriculum anchor: England KS3 Science: conservation of mass; changes of state and chemical reactions; and simple quantitative interpretation of reactant and product masses.
This game is designed as short independent practice after an idea has been introduced. It does not replace direct teaching, mathematical or scientific discussion, or an adult checking whether the learner can explain the idea away from the screen.
Draw a boundary around the measured system before calculating and check whether a gas can enter or leave. Take a break when you need one.
Does it need an account? No. The game runs in the browser and asks for no name, email address, school or location.
Is it timed? Timing varies by activity. Check the available modes and instructions before starting.
Can it be used on a phone? Controls vary by game. Use the on-screen buttons or read the instructions for keyboard and drag actions.
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