C125 Final- Correct Answers Latest Update

Rearrange the following equation to solve for P. (P+a)(V-b)=nRT - Answer- P= nRT/V-b -a What is the y-intercept if B is plotted on y-axis and A is plotted on x-axis? - Answer- -20 Interpolation - Answer- estimating a value within the range of measured data extrapolation - Answer- projection; conjecture; V. extrapolate: infer (unknown information) from known information Assume that multiple trials of an experiment were performed. What is the quantity that describes how closely the results of the trials are to each other? - Answer- precision Which of the following should not be rounded up if we want to keep 3 sig figs? a) 1.0381 b) 999.9 c) 0.05464 d) 12.56 - Answer- c) 0.05464 Which one is not rounded correctly when keeping 3 sig figs? a) 1.0150 to 1.02 b) 123.4 to 123 c) 12.451 to 12.4 d) 1387 to 1.39*10^3 - Answer- c) 12.451 to 12.4 A student measured molar mass of butane to be 65 g/mol. Molar mass of butane should be 58 g/mol. What is the percent error of his measurement? - Answer- 12% A student used water displacement method to measure the density of a metal. The average result of five attempts was 2.763 g/mL, and the calculated standard deviation was 0.026 g/mL. How should the result be reported in a "mean +/- st. dev." format - Answer- 2.76 +/- 0.03 g/mL How many significant figures should the result of the following calculation have? All Xs are digits that are purposefully omitted; they are not multiplication signs. The calculation includes only division and addition. 16.XXX/(X.7 + 99.6) - Answer- 4