Measurements Chemistry

The unit cm³ is used to express

• length

• mass

• volume

• time

The SI base units for time and temperature are

• hour and degree Celsius.

• second and degree Celsius.

• hour and kelvin.

• second and kelvin.

Which of these shows SI unit prefixes arranged in order from smallest to largest?

• centi, milli, kilo

• milli, centi, kilo

• kilo, milli, centi

• kilo, centi, milli

• 0.102 g/cm³

• 9.80 g/cm³

• 378 g/cm³

• 1.20 ´ 104 g/cm³

The conversion factor  10³mL/1L would be used to change  

• milliliters to liters.

• liters to milliliters.

• units of volume to units of length.

• units of length to units of volume.

An object’s weight is a measure of

• the force with which it is attracted by gravity.

• the pressure exerted on a scale.

• the amount of material per unit volume.

• the force causing the object to move.

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The SI base unit for mass is the

• gram.

• cubic centimeter.

• meter.

• kilogram.

Which of these is not an SI base unit?

• meter

• pound

• kelvin

• ampere

Precision is related to all of these except

• reproduciblity of measurements.

• range of measurement values.

• number of significant figures.

• closeness of a measurement to the accepted value.

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.