AP Chemistry Unit 1 Progress Check MCQ 2025 – Exam Questions & Answers with Rationales

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AP Chemistry Scoring Guide



Unit 1 Progress Check: MCQ


1. Which of the following numerical expressions gives the number of moles in of ?


A



B



C



D




In a lab a student is given a sample of pure metal. Which of the following pieces of information is
2.
most useful for determining the number of atoms in the sample? Assume that the pressure and
temperature in the lab are and .

A The molar mass of


B The density of at


C The volume of the sample


D The ratio of the two main isotopes found in pure




3. A sample of which of the following compounds has the greatest mass?




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AP Chemistry Scoring Guide



Unit 1 Progress Check: MCQ


A



B



C



D




4.




The mass spectrum for an unknown element is shown above. According to the information in the spectrum,
the atomic mass of the unknown element is closest to




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AP Chemistry Scoring Guide



Unit 1 Progress Check: MCQ


A



B



C



D




5.




The mass spectrum represented above is most consistent with which of the following elements?

A



B



C



D




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