A student graphs the data collected in the drop-volume determination done with a
ID: 1534681 • Letter: A
Question
A student graphs the data collected in the drop-volume determination done with a buret. All the points except one fall on a straight line. The last point is significantly above the straight line the graph. Which of the following would account for this? The student miscounted the drops and actually delivered more drops than the number recorded in Table for that point. The student miscounted the drops and actually delivered fewer drops than the number recorded in Table 3.7 for that point. The buret was misread at that point. The recorded value was less than the correct value. More than one response is correct. Explain your answer: ______________ A student determines the density of an unknown liquid by weighing a sample of known volume. The reported density is found by the instructor to be significantly higher than it should be. Which of the following experimental errors could account for this result? The pipet used was filled to a level above the calibration mark. The balance was read incorrectly, and the recorded sample mass was lower than the true sample mass. A part of the sample was spilled from the beaker before it was weighed. Explain your answer: _________ A student determines the density of a rubber stopper by putting it into a graduated cylinder of water as you did in Part F. The stopper sinks to the bottom of the cylinder. The reported density of the stopper is 0.12 g/mL. This result might be correct. is probably correct. cannot possibly be correct. Explain your answer: ___________Explanation / Answer
5. b
It's essential to know what is on the x-axis (horizontal) and what is on the y-axis (verical). I'll assume that the count is horizontal (first column in Table 3.7) and that volume is vertical (second column in the table). If this were the case, then you have a higher than expected volume for the number of drops counted. It's the same as saying that not enough drops were counted for a given volume. This corresponds to answer b.
6. a
Density is mass divided by volume like g/ml. If the measured density is higher than expected, it means that either the measured mass was higher than reality or the measured volume was less than actual.
Not b, because if the mass (weight) appears low, so will the density. Not c, because if part of the sample was spilled, the the mass will appear low. Only "a" will cause a higher than expected mass reading, which will lead to a higher than expected density reading.
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