SELAMAT DATANG Kuiz Sains Tambahan Tingkatan 5 Bab 2 Set 1
Penerokaan Unsur Dalam Alam (English)
KUIZ INI MENGANDUNGI 10 SOALAN
1. When solid zinc carbonate (ZnCO3) is heated strongly, it undergoes thermal decomposition. What are the expected products?
2. What is the most suitable method for preparing an insoluble salt like lead(II) sulfate (PbSO4)?
3. During the preparation of copper(II) chloride from copper(II) oxide and hydrochloric acid, why is the copper(II) oxide powder added in excess?
4. 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?
5. 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?
6. A student heats a white crystalline salt in a test tube. The residue is yellow when hot and turns white upon cooling. A gas is also produced that turns limewater cloudy. What is the most likely identity of the salt?
7. During a qualitative analysis, an aqueous solution is observed to be blue. Which cation is most likely present in the salt solution?
8. 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?
9. A gas produced during a chemical reaction is tested by bubbling it through limewater, which turns milky. What is this gas?
10. 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?
