California CAST Grade 5 Science Practice

Practice physical, life and earth/space science with original CA NGSS-connected questions, evidence and engineering tasks.

This is independent, untimed practice using original classroom material and hypothetical data. It samples selected skills and curriculum connections; it does not cover every standard, assessment target or official item format. It is shorter than an official assessment and is not adaptive, calibrated, official released material, an official score estimate or evidence of full curriculum mastery.

18 original questions and tasks. Written responses have task-specific checklists and examples; they are not automatically scored. The material and data are fictional classroom examples.

This CAST bank connects Grades 3–5 science. Engineering is integrated into the three science reporting domains.

Choose a skillSupport level

Request a hint when you need one. All levels use the same original questions.

Feedback reviewed for 0 of 18 questions in this selection. This is practice, with no official score.

Question 1 of 18 · Physical Sciences

Track matter in a system · Curriculum connections: 5-PS1-2

A sealed melting investigation

Original classroom material; people, sources and data are fictional.

Original classroom scenario with hypothetical measurements. A closed, leakproof container holds ice and air. The class weighs the entire container before and after the ice melts. Nothing enters or leaves. The same balance reads 240 g both times. A second open cup becomes lighter as its water evaporates.

Which model best explains why the closed container remains 240 g after the ice melts?

Select one answer.Melting removes some matter and creates an equal amount of new matter.The same matter remains inside, although the water changes from solid to liquid.The ice becomes lighter, but the container grows heavier on its own.Liquid water has no mass.

Official curriculum and preparation resources

Research reviewed October 1, 2026. Use the official practice platform for the state's item formats, tools and accessibility features. Local schools confirm testing dates, participation and individual supports.

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California CAST Grade 5 Science Practice

A sealed melting investigation

Which model best explains why the closed container remains 240 g after the ice melts?

Official curriculum and preparation resources

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