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Mole Concept: Avoid Common Errors in Sec 3 Chemistry Calculations

Secondary 3 Chemistry students often face difficulties when tackling questions that involve both mole concept and chemical equations. A common stumbling block is understanding how limiting reagents affect the amount of precipitate formed, especially when solutions are mixed in varying volumes. Take this question as an example: When solutions of lead(II) nitrate and sodium iodide ...

KooBits P6 Math Angles Question: Finally Solved with Step-by-Step Help

Primary 6 students often face challenging mathematics questions in school, Student Learning Space (SLS) or on platforms like KooBits. One common question that many students find tricky is: “The figure below shows three identical squares ABCD, DEFG and DHIJ. Find x.” For students who struggle to solve such questions, waiting for the next class or tutorial ...

2017 PSLE Ribbon Question: Why This Tricky Math Problem Stumped So Many

The PSLE ribbon question from 2017 is a lasting reminder that even questions which look simple at first glance can catch students off guard. Especially in a high-pressure exam setting, small misinterpretations can lead to the wrong answer. 2017 PSLE Ribbon Question: Jess needs 200 pieces of ribbon, each of length 110 cm, to decorate ...