Measurement and Experimental Techniques

Measurement and Experimental Techniques Content Physical Quantities and their related S.I Units and Basic Conversion Physical Quantity S.I Unit Conversions Mass kilogram (kg) 1kg = 1000g 1 tonne = 1000kg Time second (s) 1h = 60mins 1 min = 60s Temperature Kelvin (K) Degrees (K) = Degrees in Celsius +273 Volume Cubic metre (𝑚3) 1𝑚3 = 1000𝑑𝑚3 1𝑑𝑚3 = 1000𝑐𝑚3 Physical Quantities and the Apparatus used Physical Quantity Apparatus Name Degree of Accuracy Mass Beam Balance ±0.05𝑔 Electronic Balance ±0.01𝑔 Time Stopwatch (Analogue) ±0.1𝑠 Stopwatch (Digital) ±0.01𝑠 Temperature Mercury/Alcohol in-glass thermometer ±0.5℃ Data Logger with Temperature Sensor Undefined (more accurate) Volume (Liquid) Measuring Cylinder 𝑛𝑒𝑎𝑟𝑒𝑠𝑡 0.5𝑐𝑚3 Burette 𝑛𝑒𝑎𝑟𝑒𝑠𝑡 0.05𝑐𝑚3 Pipette Fixed Volumes Volume (Gas) Gas Syringe 𝑛𝑒𝑎𝑟𝑒𝑠𝑡 1𝑐𝑚3 Chemicals used for drying Gases Drying Reagent Name What it cannot dry Concentrated Sulfuric Acid Alkaline gases Quicklime Acidic Gas Fused Calcium Chloride -

Methods of Gas Collection Test yourself 1. What is the SI Unit for? Give appropriate conversions of units i. Mass ii. Volume iii. Temperature iv. Gas Volume 2. State 3 drying agents and what gases is can and cannot dry? 3. 3 gases, Ammonia, Hydrogen, Oxygen are meant to be collected, suggest an acceptable set- up to obtain a clean dry measurable sample?