Warm-Up #9
1. What are the steps in the scientific method?
2. An object has a mass of 57.62g. Find the object’s density given that its volume is 40.5 mL.
3. Determine the average of the following measurements: 5.12 g/mL, 5.00 g/mL, 5.32 g/mL, and 5.50 g/mL.
4. The density of copper is listed as 8.94 g/mL. Two students each make
three density determinations of samples of the substance. Compare
the two sets of results in terms of precision and accuracy.
Student A results
7.3g/mL
9.4 g/mL
8.3 g/mL
Student B results
8.4 g/mL
8.8 g/mL
8.0 g/mL
5. A student measures the mass of a sample as 9.67g. Calculate the percent error, given the correct mass is 9.82g.
6. A handbook gives the density of calcium as 1.54g/cm3. Based on lab measurements, what is the percent error of
density calculation of 1.25g/cm3.
Warm-Up #9
1. What are the steps in the scientific method?
2. An object has a mass of 57.62g. Find the object’s density given that its volume is 40.5 mL.
3. Determine the average of the following measurements: 5.12 g/mL, 5.00 g/mL, 5.32 g/mL, and 5.50 g/mL.
4. The density of copper is listed as 8.94 g/mL. Two students each make
three density determinations of samples of the substance. Compare
the two sets of results in terms of precision and accuracy.
Student A results
7.3g/mL
9.4 g/mL
8.3 g/mL
Student B results
8.4 g/mL
8.8 g/mL
8.0 g/mL
5. A student measures the mass of a sample as 9.67g. Calculate the percent error, given the correct mass is 9.82g.
6. A handbook gives the density of calcium as 1.54g/cm3. Based on lab measurements, what is the percent error of
density calculation of 1.25g/cm3.