Chemistry Chapter 2 Measurements and Calculations

The SI base units for time and temperature are

• hour and degree Celsius.
• second and degree Celsius.
• hour and kelvin.
• second and kelvin.

The unit cm³ is used to express 

•  length.
• mass.
• volume. 
• time.

Tags

CCSS.3.MD.A.2

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.

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 measurement 0.0265 g, rounded off to two significant figures, would be

• 0.026 g. 
• 0.027 g.
• 0.03 g.
• 0.030 g.

The number of significant figures in the measurement 170.040 km

• three. 
• four. 
• five.
• six.

Expressed in scientific notation, 0.0930 m is

• 9.30 × 10⁻⁴ m.
• 9.30 × 10⁻² m. 
• 9.3 × 10⁻³ m.
• 93 × 10⁻³ m.

How close a set of measurements are to each other...

• accuracy

• precision

• % error

• luminous intensity

How close a measurement is to the accepted value...

• accuracy

• precision

• electric current

• adaptability

A substance has a mass of 400 grams and a volume of 100 mL. What is the density in g/mL?

• 40000

• .25

• 4

• 40