3. An experiment was carried was by four student, each student performed a four (4) trial measurement for the density of osmium \( (22.5 \mathrm{~g} / \mathrm{mL}) \), which of the following student was able to perform an accurate, precise, accurate and precise measurements. \begin{tabular}{|c|c|c|c|c|} \hline Trial & John & Sally & Megan & Mike \\ \hline 1 & 22.924 & 22.316 & 22.449 & 22.501 \\ \hline 2 & 22.923 & 22.527 & 2.531 & 22.499 \\ \hline 3 & 22.925 & 2.2941 & 22.495 & 22.502 \\ \hline 4 & 22.926 & 22.136 & 22.542 & 22.498 \\ \hline \end{tabular}
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In this case, the accepted value is 22.5 g/mL. - Precision refers to how close a series of measurements are to each other, regardless of how close they are to the true value. Now, let's analyze the data: - John's measurements are all very close to each other, Show more…
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A student performed a density experiment in triplicate and recorded the data shown. Calculate the average density (in g/mL) for this experiment. Density Trial 1 5.08 g/mL Trial 2 4.92 g/mL Trial 3 5.13 g/mL
Ma Ednelyn L.
(a) To identify a liquid substance, a student determined its density. Using a graduated cylinder, she measured out a $45-\mathrm{mL}$ sample of the substance. She then measured the mass of the sample, finding that it weighed $38.5 \mathrm{~g}$. She knew that the substance had to be either isopropyl alcohol (density $0.785 \mathrm{~g} / \mathrm{mL})$ or toluene (density $0.866 / \mathrm{mL}$ ). What are the calculated density and the probable identity of the substance? (b) An experiment requires $45.0 \mathrm{~g}$ of ethylene glycol, a liquid whose density is $1.114 \mathrm{~g} / \mathrm{mL}$. Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use? (c) A cubic piece of metal measures $5.00 \mathrm{~cm}$ on each edge. If the metal is nickel, whose density is $8.90 \mathrm{~g} / \mathrm{cm}^{3},$ what is the mass of the cube?
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