Which of the following volume measurements is the LEAST precise?
a 2 liter bottle of soda
a 255 gram box of cookies
a 500 milligram antacid tablet
a 473 milliliter bottle of salad dressing
Mandy and Jessica measured the pH of a nearby stream on 6 consecutive days. The data they
collected is shown in the following table.
Which of the following statements correctly describes the accuracy of these measurements?
Both data sets are equally accurate, since they are measured to the same decimal place.
Neither set is accurate, because the data was collected for only a few days.
Mandy’s data is more accurate, because the measurements are closer together.
The accuracy of the data cannot be assessed, since the sample conditions could not have
been the same for each measurement.
Which piece of glassware gives the most precise measurement?
a 3 mL glass pipet
a 3 L Erlenmeyer flask
a 10 mL graduated cylinder
a 10 mL beaker
Identify the correct conversion of 4.2 grams (g) to kilograms (kg)
4.2 g = 0.0042 kg
4.2 g = 0.042 kg
4.2 g = 42 kg
4.2 g = 4,200 kg
A meniscus sometimes causes error in the measurement of which dimension?