SPM Chemistry case studies
SPM Chemistry · Put your knowledge to work in context.
SPM Kimia - dalam bahasa Inggeris SPM Chemistry - ialah salah satu mata pelajaran dalam Sijil Pelajaran Malaysia, peperiksaan kebangsaan yang tersenarai di bawah kategori "Peringkat Menengah Atas" dalam portal Lembaga Peperiksaan Malaysia. Ia ditujukan kepada murid menengah atas yang mengambil aliran sains, calon persendirian, serta calon yang mengulang melalui Sijil Pelajaran Malaysia Ulangan (SPMU), yang didaftarkan melalui Sistem Pengurusan Peperiksaan Dalam Talian (SPPAT). The SPM Chemistry case studies are 5 cases and about 3,733 words.
1Three Mass Spectrometer Lines from One Meteorite: Element, Mixture or Two Elements?
A school laboratory receives two powdered samples taken from different parts of the same meteorite fragment. The mass spectrum of Sample A shows three peaks at mass-to-charge ratios 24, 25 and 26 with relative abundances of 79.0%, 10.0% and 11.0% respectively.
767 words, about 4 min2Copper(II) Sulphate Crystals for a Science Fair: Limiting Reactant, Yield and Water of Crystallisation
A Form 5 student plans to enter a science fair with copper(II) sulphate crystals she has prepared herself. She adds 2.00 g of black copper(II) oxide to 25.0 cm3 of 2.00 mol dm−3 sulphuric acid, warms the mixture, filters off any excess solid, then evaporates the filtrate and cools it to crystallise.
698 words, about 3 min3Marble Chips and Hydrochloric Acid: Judging Four Rate Experiments
A group is investigating the rate of reaction between marble chips (calcium carbonate) and dilute hydrochloric acid by collecting carbon dioxide in a 500 cm3 gas syringe. Each run uses exactly 2.0 g of marble and 50.0 cm3 of acid.
835 words, about 4 min4A Drain Cleaner Review: Titration Data, Indicator Errors and an Unidentified Alkali
A student buys a bottle of liquid drain cleaner whose label reads 'contains 5.0% w/v sodium hydroxide'. Using a pipette she transfers 25.0 cm3 of the cleaner to a 250.0 cm3 volumetric flask and makes it up to the mark with distilled water.
694 words, about 3 min5Choosing a Fuel for a Water-Heating Demonstration: Energy, Cost and Practical Judgement
A school team must heat 500 g of water from 28 °C to 90 °C for a demonstration and is allowed to buy only one fuel. Three options are available locally: Ethanol: ΔHc = −1376 kJ mol−1, Mr = 46, RM 45 per kg, sold in a plastic bottle.
739 words, about 4 min