O Level Chemistry & Physics - Experimental Design PDF

DARRELL ER (COPYRIGHTED) © DARRELL ER (COPYRIGHTED) TOPIC 1.1: EXPERIMENTAL DESIGN  DARRELL ER (COPYRIGHTED) © THE ABOUT TIME CHAPTER ANALYSIS EXAM WEIGHTAGE  DARRELL ER (COPYRIGHTED) © KEY CONCEPT EXPERIMENTA...

DARRELL ER (COPYRIGHTED) © DARRELL ER (COPYRIGHTED) TOPIC 1.1: EXPERIMENTAL DESIGN  DARRELL ER (COPYRIGHTED) © THE ABOUT TIME CHAPTER ANALYSIS EXAM WEIGHTAGE  DARRELL ER (COPYRIGHTED) © KEY CONCEPT EXPERIMENTAL DESIGN APPARATUS FOR MEASUREMENT GAS COLLECTION  DARRELL ER (COPYRIGHTED) © MUST KNOW APPARATUS FOR MEASUREMENT Apparatus Smallest division Uncertainty Example of (1/2 of smallest division) value Burette 0.1cm3 0.05 cm3 27.00 cm3 28.85 cm3 Pipette fixed fixed 25.0 cm3 (fixed value) Measuring cylinder 1 cm3 0.5 cm3 16.0 cm3 17.5 cm3 Digital stopwatch 0.01s 0.01s 26.46 s 1.5 mins Thermometer 1oC 0.5 oC 21.0 oC 46.5 oC Electronic balance 0.01g 0.01g 4.53 g  DARRELL ER (COPYRIGHTED) © KEY CONCEPT DISPLACEMENT OF WATER This method for collecting gases which are insoluble or slightly soluble in water. As the gases does not dissolve in water, they would rise to the top of the gas jar. Some examples of gases collected via this method includes H2, O2, CO and CO2.  DARRELL ER (COPYRIGHTED) © KEY CONCEPT UPWARDS DELIVERY This method is used to collect gases which have a lighter density as compared to air*. NH3 & H2 are gases which can be collected using this method. * Mr of air is around 28.8. (78% N2 + 21% O2)  DARRELL ER (COPYRIGHTED) © KEY CONCEPT DOWNWARDS DELIVERY This method is used to collect gases which have a heavier density as compared to air*. Some examples of gases collected using this method includes Cl2, HCl and SO2. * Mr of air is around 28.8. (78% N2 + 21% O2)  DARRELL ER (COPYRIGHTED) © KEY CONCEPT DRYING OF GAS To dry a sample of gas, we can pass it through drying agents like: - concentrated sulfuric acid - quicklime (calcium oxide) - fused calcium chloride (calcium chloride)  DARRELL ER (COPYRIGHTED) © ADVANCED Concentrated sulfuric acid things Quicklime (Calcium Oxide) to note Fused Calcium Chloride Try it yourself! (TYS Question) Answer: Try it yourself! (TYS Question) Answer: About Us Notes prepared by: OVERMUGGED is a learning platform created by tutors, for students. Our team of specialist tutors offer 1-to-1 private tuition, group tuitions and crash courses. Follow us on IG and join our Telegram channel to get the latest updates on our free online revision sessions, webinars and giveaways! If you would want to join Darrell's group tuition, contact him at: Whatsapp: 8777 0921 Telegram: @DarrellEr Website: https://www.overmugged.com/darrell Darrell Er For more free notes & learning materials, visit: www.overmugged.com 'O' Levels Chemistry & Physics  OVERMUGGED's Curated Notes Lower Sec 'A' levels $30 $40 Found the free notes useful? We got something better! OVERMUGGED's curated notes is a highly condensed booklet that covers all content within the MOE syllabus. This booklet consist of key concept breakdowns, worked examples and exam tips/ techniques to required to ace your exams. Get an upgraded version of the free notes and supercharge your revision! Purchase here. 'O' levels $40/$50 Crash courses Check out our upcoming crash courses at: https://www.overmugged.com/crashcourses 'O' levels subject available: - Pure Chemistry - Pure Physics - Pure Biology - Combined Science - E-Math -A-Math -English - History - Geography - Combined Humanities - Principles of Accounts (POA)