Indonesian Curriculum Science

2. Describe what occurs during changes of state

Mission Objectives

Explain the conservation of mass and reversibility in melting, freezing, evaporation, sublimation, and condensation

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Keywords

Words and meanings to learn

freezing

when a substance changes from a liquid to a solid

condensation

when a substance changes from a gas to a liquid

evaporation

when a substance changes from a liquid to a gas

sublimation

the process of changing from a solid to a gas without passing through an intermediate liquid phase

deposition

the direct solidification of a vapour by cooling; the reverse of sublimation

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This lesson has been written by

Dr Shannon Weldon

Shannon started her journey with Developing Experts by completing PHD placement while studying for her Doctorate in Developmental Biology at the University of East Anglia. Shannon has since joined the team full-time as a Project Manager working with the company's industry partners. Shannon knows a lot about chickens!

Kate Richards

Kate’s journey as a science educator spans over 15 enriching years. Her passion for unravelling the complexities of the human body led her away from medicine (as she hates blood but loves medical t-shows) and into the world of teaching. She’s had the privilege of nurturing young minds in KS3 and KS4 science, guiding A-level Biology students, and even taught year 4 students in Spain, broadening her teaching horizons early in her career. Kate holds a Masters in Teaching (MTeach) and specialises in biology. Her research for her Master's degree focused on the profound impact of self-efficacy on classroom learning. Beyond the classroom, she finds solace in leisurely family walks and exploring new destinations through travel. She finds that the most rewarding aspect of teaching is witnessing those magical "light bulb moments" when students grasp the intricacies of science right before her eyes. 

Required Resources

Resources: 2 boiling tubes, a beaker (250 cm3 or similarly sized container), a thermometer (0 - 100°C), a mass balance, a kettle, milk chocolate (1 square per pupil and 1 square per pair or group), milk chocolate that has been melted and solidified (1 square per pair or group) and the handout. 

Handout: An investigation sheet for the students to record their results as they investigate mass in changes of state. 

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