Experiment 1: MEASUREMENT Pre-Lab Exercises . What is the length of the rod show

Question

Experiment 1: MEASUREMENT Pre-Lab Exercises . What is the length of the rod shown below? 2 5 7 9 2. If Student A measures the volume of a liquid and reports its volume as 23.50 mL and Student B measures a different amount of the same liquid and reports its volume as 15.0 mL, is it likely that the students used the same measuring device? Yes or no? Explain your answer. 3. If you were asked to measure 25.0 mL of a liquid and to transfer it to another container, which of the following glassware could you use? Choose all that apply. Give reason(s). a) A 50-mL buret with smallest divisions of 0.1 mL b) A 50 mL beaker with smallest divisions of 10 mL c) A 50-mL volumetric flask d) A 50-ml graduated cylinder with smallest divisions of 1 mL. e) A 25-mL pipet 4. A group of five students attempted to estimate 100 g of a substance by balancing the amount of the substance with a 100-g standard mass and obtained the following masses after each estimated amount was weighed: 95.8634 g,80.8125 g, 106.5078 g,98.2865 g, and 86.4453 g. Create a data table as shown below and use the data to determine the answers to the following questions: Mass (g) | Deviation (g) % Deviation | Error (g) % Error a) What is the mean? And what is the true value? b) What are the deviation and % deviation from the mean for each value? c) What are the error and % error for each value?

Explanation / Answer

Ans 1 :

The length of the rod shown in figure is 6.80

It is because the significant figures in the measured value must include all the known units plus on estimated digit accordingly.

So here the significant figures must be three , so the measurement will be 6.80 and not 6.8 or 6.9

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