English National Curriculum Science

6. Explain how mass is conserved in chemical reactions

Mission Objectives

Carry out two experiments which show that mass is conserved in both changes of state and chemical changes.

Explain why mass is conserved during changes of state and during chemical reactions.

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KS3-02-06 Handout KS3-02-06 Handout PDF

Keywords

Words and meanings to learn

reactants

Substances that react to produce products in a chemical reaction

conservation of mass

The idea that in any chemical reaction or state change, the total mass of the reactants before the reaction must equal the total mass of the products after the reaction

products

Substances which are formed as the result of a chemical reaction

propane

A flammable gas, present in natural gas and used as bottled fuel

closed system

A system in which matter cannot enter or leave; for example, a sealed container

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This lesson has been written by

Alison Green

Alison is a qualified secondary chemistry teacher and former scientist, seamlessly blending her background in scientific development with a passion for education. With over 15 years of teaching experience across state and independent schools, including most recently at Stafford Grammar School, Alison specialises in equipping students with the tools to excel in Chemistry at KS3, GCSE and A-levels. Her transition to online education, backed by a Master’s degree, has spurred her transition to freelance content creation and chemistry tutoring, tapping into a wealth of examining experience spanning over ten years to steer students towards their desired academic and professional paths.

When she's not shaping young minds, Alison unwinds by exploring the natural beauty of the Shropshire hills and embracing the tranquillity of Tai Chi, mirroring the balance she instils in her educational endeavours.

Required Resources

Resources: Materials for the Mission Assignment, such as a 500l plastic drinks bottle, a balloon, sodium bicarbonate, vinegar, measuring cylinder, balance or digital scale, cling film, ice, vessel for ice, spatula, elastic band and safety goggles.

Support Handout: Page 1 of the handout. 

Core Handout: Handout contains details of how to complete the tasks.

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