Day 13 - PM

Report the number of significant figures in each of the following values:

0.00237 g

Report the number of significant figures in each of the following values:

64 mL

Round the following measurements to three significant figures.

14.62 m

Written in scientific notation, the measurement 0.000 065 cm is -

• 65 x 10^-4 cm

• 65 x 10^-5 cm

• 65 x 10^-6 cm

• 65 x 10^-4 cm

A measurement is accurate if it -

• is reproducible.

• is close to the true value.

• has many decimal places.

• has many significant figures.

Precision is related to all of these except:

• reproducibility of measurements.

• range of measurement values.

• number of significant figures.

• closeness of a measurement to the accepted value

Expressed in scientific notation, 0.0930 m is -

• 93 x 10^-3 m.

• 9.3 x 10^-3 m.

• 9.30 x 10^-2 m

• 9.30 x 10^-4 m

In division and multiplication, the answer should have the same number of significant figures as the -

• number in the calculation with the fewest significant figures.

• number in the calculation with the most significant figures.

• average number of significant figures in the calculation.

• total number of significant figures in the calculation.

The number of significant figures in the measurement 170.040 km is -

• three

• four

• five

• six

By making several measurements of a sample with the same balance, a chemist obtained values of 5.224 g, 5.235 g, and 5.259 g for the mass of a sample. Without knowing the actual mass of the sample, we can tell that these measurements have-

• high precision.

• high accuracy.

• low precision.

• low accuracy.