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