Question

• Know what types of instruments are used for what measurements o a balance for mass; a flask for volume; a thermometer for temperature; a barometer for pressure

• Be able to convert between ordinary numbers and scientific notation o 0.000 000 034 is 3.4 × 10-8 ; 574,000,000,000 is 5.74 × 1011

• Unit factors come from unit equations o 1 lb = 454 g can form the unit factors 1 lb/454 g and 454 g/1 lb

• Perform conversions using the unit analysis method o how long is a meter in inches, given that 1 in = 2.54 cm and 1 m = 100 cm 1 meter × (100 cm/1 m) × (1 in/2.54 cm) = 39.4 in o what is 300 K in °C, given that K = °C + 273 300 = °C + 273 °C = 27 °C

Answer 1

Part a

types of instruments

Balance is used for mass

a flask is used for volume

a thermometer is used for temperature measurement

a barometer is used for pressure

Part b

ordinary number = 0.000000034

scientific notation of the above number = 3.4 * 10^-8

ordinary number = 574,000,000,000

scientific notation of the above number = 5.74 * 10^11

Part c

• Unit factors

1 lb = 454 g or 1 lb/454 g or 454 g/1 lb

• conversions from meter in inches

1 in = 2.54 cm

1 m = 100 cm

= 1 meter × (100 cm/1 m) × (1 in/2.54 cm)

= 39.4 in

Part d

Convert 300 K in °C

K = °C + 273

300 = °C + 273

°C = 27°C