MATSEC SEC Chemistry case studies
MATSEC SEC Chemistry · Put your knowledge to work in context.
The Secondary Education Certificate (SEC) is a qualification awarded by the MATSEC Examinations Board, which is listed on the University of Malta's own website as the body responsible for MATSEC examinations and related services. The MATSEC Board is one of the academic entities reachable through the University of Malta's Study menu, and its pages host regulations, guidelines and policies, syllabi, current session information, applications, past papers, marking schemes and exemplars, and research and reports. The MATSEC SEC Chemistry case studies are 5 cases and about 2,294 words.
1Preparing Copper(II) Sulfate Crystals: Excess Reactant and Yield
A student is preparing hydrated copper(II) sulfate crystals. They measure 50.0 cm³ of 1.00 mol/dm³ sulfuric acid into a beaker, warm it to about 60 °C, and add 5.00 g of copper(II) oxide powder in small portions with stirring.
399 words, about 2 min2Copper Sulfate Electrolysis: Active versus Inert Electrodes
Two students electrolyse separate 0.50 mol/dm³ copper(II) sulfate solutions using a current of 0.50 A for 20.0 minutes. Student A uses two clean copper electrodes.
435 words, about 2 min3Marble Chips and Acid: A Confounded Rate Experiment
A student investigates the reaction between calcium carbonate and hydrochloric acid by measuring the volume of carbon dioxide collected every 10 s. In Run 1 they use 2.00 g of marble chips and 50.0 cm³ of 1.00 mol/dm³ hydrochloric acid at 20 °C.
461 words, about 2 min4Identifying Four Colourless Liquids with Limited Tests
Four unlabelled colourless liquids are known to be ethanol, ethanoic acid, ethanal and ethyl ethanoate. A student is given only these tests: (i) add a few drops of bromine water and shake; (ii) add a small spatula of sodium carbonate and look for bubbles; (iii) add a piece of sodium metal.
539 words, about 3 min5Choosing an Indicator in a Weak Acid–Strong Base Titration
A student titrates 25.0 cm³ samples of ethanoic acid solution of unknown concentration with 0.100 mol/dm³ sodium hydroxide. Using methyl orange, the indicator turns from red to yellow after 22.90 cm³ of alkali.
460 words, about 2 min