Measurement Practice

Which of these are good rules to follow when measuring in Chemistry? Check ALL that apply.

• Always include units.

• In chemistry we measure length in inches.

• We should include as many numbers as we want to when measuring.

• We should report our measurements one digit past what we can be certain of; we must estimate the last digit.

Why do we estimate a last digit when measuring in Chemistry?

• Because scientists like to make things up.

• Because we try to be as specific/precise as possible with measurements.

• Because that's how scientists have always done it.

• Because it's easy to make up a number when measuring.

What is the volume of the liquid in this graduated cylinder? Zoom in if you need to by clicking the picture.

• 44 mL

• 30.6 mL

• 37 mL

• 36.3 mL

What is the measurement for the line in centimeters (cm)? Click on the picture if you need to zoom in.

• 2.82 cm

• 2.9 cm

• 2.08 cm

• 2.90 cm

What is the measurement for the green line in centimeters? Click the picture if you need to zoom in.

• 89cm

• 88.9cm

• 88.90cm

• 88cm

How much liquid is in the graduated cylinder? Click the picture if you need to zoom in.

• 25.8 mL

• 27 mL

• 27.0 mL

• 25 mL

True or False: We never estimate a last digit if the measuring tool is digital.

• True

• False