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California CAST Grade 8 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 middle-school Grades 6–8 science. Engineering is integrated into the three science reporting domains.

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

Analyze chemical-change evidence · Curriculum connections: MS-PS1-2, MS-PS1-5

Inside a sealed reaction bag

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

Original classroom scenario with hypothetical data. Two solutions mix inside a sealed bag. Bubbles form. Analysis identifies the gas as a new substance, carbon dioxide, rather than vapor of either starting liquid. The combined bag and contents measure 125 g before and after mixing. A particle model shows the starting atoms rearranged into new molecules; no atoms cross the bag boundary.

Which observation best supports a chemical reaction rather than only a change of state?

Select one answer.

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.

TopicsScience

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