MEASUREMENT & EXPERIMENTAL TECHNIQUES
Mass
SI unit: kg
beam balance
electronic balance
Time
SI unit: second ( s )
digital stopwatch
0.1s
Temperature
SI unit: K
Volume
SI unit: cubic metre
measuring cylinder
nearest 0.5cm3
burette
nearest 0.05cm3
pipette
20.0 cm3 or 25.0 cm3
Collecting Gases
based on
solubility: how soluble the gas is in water
density: how dense the gas is compared to air
Displacement of Water
collect gases that is insoluble/ slightly soluble in water
Downward Delivery
collect gases soluble in water denser than air
Upward Delivery
gases that are soluble in water
less dense than air