Question 1
In the middle school model of matter, which description of an atom is most accurate?
Correct Answer:
The smallest particle of an element that still has that element's properties
Question 2
Which example is a molecule?
Correct Answer:
O₂, two oxygen atoms bonded together
Question 3
Which process is a chemical change?
Correct Answer:
Iron nails rusting when oxygen and water react with iron
Question 4
Baking soda and vinegar react in a sealed, flexible container and produce a gas. If no mass escapes, how does the total mass after the reaction compare with the mass before?
Correct Answer:
It is the same because mass is conserved in a closed system
Question 5
Which particle is negatively charged and occupies the region outside the nucleus in common middle school atom models?
Correct Answer:
Electron
Question 1
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About this Exam

Prepare with the CAST Grade 8 Practice Questions - California Science Test (CAST) - Grade 8 Exam practice quiz. This question bank includes 100 questions covering energy, force, mass, because, and mainly. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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CAST Grade 8 Practice Questions - California Science Test (CAST) - Grade 8 Exam

This practice set contains 100 questions from the matching question bank and focuses on energy, force, mass, because, and mainly. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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