SELAMAT DATANG Kuiz Sains Tambahan Tingkatan 5 Bab 2 Set 1
Penerokaan Unsur Dalam Alam (English)
KUIZ INI MENGANDUNGI 10 SOALAN
1. A student adds aqueous ammonia dropwise to a solution containing copper(II) ions until the ammonia is in excess. What is the expected final observation?
2. A student performs a flame test on a salt and observes no distinct color. Then, the student adds sodium hydroxide solution to an aqueous solution of the salt and gently warms it. A gas is produced that turns damp red litmus paper blue. Which cation is present?
3. When solid zinc carbonate (ZnCO3) is heated strongly, it undergoes thermal decomposition. What are the expected products?
4. Which of the following methods is most suitable for preparing a pure, dry sample of the insoluble salt lead(II) iodide (PbI2)?
5. In the reaction MgCO3 + 2HCl→MgCl2 + CO2 + H2O, what is the mole ratio of magnesium carbonate (MgCO3) to hydrochloric acid (HCl) that is required for a complete reaction?
6. A student adds sodium hydroxide solution to an unknown salt solution, forming a white precipitate. When excess sodium hydroxide is added, the precipitate dissolves to form a colorless solution. Based on the provided flowcharts, which cation could be present?
7. What is the most suitable method for preparing an insoluble salt like lead(II) sulfate (PbSO4)?
8. During a qualitative analysis, an aqueous solution is observed to be blue. Which cation is most likely present in the salt solution?
9. The substance known as 'Plaster of Paris' is used in medicine to create casts for broken bones. According to the textbook, what is the chemical name for this salt?
10. A gas produced during a chemical reaction is tested by bubbling it through limewater, which turns milky. What is this gas?
