Question 1
An atom of chlorine-37 has an atomic number of 17. How many neutrons are in its nucleus?
Correct Answer:
20 neutrons
Question 2
Which change would convert a nitrogen atom into a different element?
Correct Answer:
Changing the number of protons in the nucleus
Question 3
Moving left to right across a period on the periodic table, atomic radius generally decreases. What best explains this trend?
Correct Answer:
Nuclear charge increases while electrons occupy the same principal shell, pulling the electron cloud closer
Question 4
In the balanced equation 2 H₂ + O₂ → 2 H₂O, how many moles of water form when 3.0 mol of H₂ react completely with excess oxygen?
Correct Answer:
3.0 mol H₂O
Question 5
A student burns methane and measures a temperature increase in the surroundings. How should the reaction energy change be classified for the chemical system?
Correct Answer:
Exothermic, because the system releases energy to the surroundings
Question 1
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Prepare with the CAST High School Practice Questions - California Science Test (CAST) - High School Exam practice quiz. This question bank includes 100 questions covering energy, change, many, design, and population. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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CAST High School Practice Questions - California Science Test (CAST) - High School Exam

This practice set contains 100 questions from the matching question bank and focuses on energy, change, many, design, and population. 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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