题目

M2LA F25 Lab Fundamentals I Quiz

多项选择题

Select all quantities whose values are exact (contains infinite number of significant figures).

选项

A.density

B.number of trials.

C.masses

D.numbers in a mole ratio from a balanced chemical equation.

E.volumes

F.formula weight

G.numbers in a ratio of a metric conversion (e.g. 1 L / 1000 mL)

H.numbers in a molecular formula

I.boiling points and freezing points

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标准答案

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思路分析

To determine which quantities are exact (containing an infinite number of significant figures), we need to identify quantities that are defined or counted, not measured. Option by option: - density: This is typically a derived quantity obtained from mass and volume measurements, so it is not inherently exact. It depends on measured values and thus has limited significant figures. Therefore, density is not exact. - number of trials.: This is a coun......Login to view full explanation