Measurements Chemistry

When a test instrument is calibrated, does its accuracy, precision, or reliability improve?

• precision
• accuracy
• reliability
• all of the above

What is the density of an object having a mass of 8.0 g and a volume of 25 cm³?

• 0.32 g/cm³
• 3.1 g/cm³
• 200 g/cm³
• 2.0 g/cm³

What is the metric system prefix for the quantity 0.000 001?

• deci
• micro
• centi
• kilo

How many significant figures are in the measurement 40,500 mg?

• four
• five
• three
• two

Which of the following equalities is NOT correct? Use the table behind this question to help you.

• 100 cg = 1 g
• 10 kg = 1g
• 1 cm³ = 1 mL
• 1000 mm = 1 m

What is the quantity 0.0075 meters expressed in centimeters?  Use the table behind this question to help you.

• 70.5 cm
• 7.5 cm
• 0.075 cm
• 0.75 cm

Which group of measurements  is the most precise? (Each group of measurements is for a  different object)

• 2.0 g, 3.0 g, 4.0 g
• 1 g, 3 g, 5 g
• 2 g, 2.5 g, 3 g
• 2 g, 3 g, 4 g

In the measurement 0.503 L, which digit is the estimated digit?

• 5
• 3
• the 0 immediately to the left of the 3
• the 0 t the left of the decimal point

What is the temperature -34^oC expressed in kelvins?

• 139 K
• 239 K
• 339 K
• 207 K

Which temperature scale has no negative temperatures?

• Joule
• Fahrenheit
• Kelvin
• Celsius