SELAMAT DATANG Kuiz Sains Tambahan Tingkatan 5 Bab 2 Set 1
Penerokaan Unsur Dalam Alam (English)
KUIZ INI MENGANDUNGI 10 SOALAN
1. Which of the following methods is most suitable for preparing a pure, dry sample of the insoluble salt lead(II) iodide (PbI2)?
2. During a qualitative analysis, an aqueous solution is observed to be blue. Which cation is most likely present in the salt solution?
3. 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?
4. 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?
5. During the preparation of copper(II) chloride from copper(II) oxide and hydrochloric acid, why is the copper(II) oxide powder added in excess?
6. A gas produced during a chemical reaction is tested by bubbling it through limewater, which turns milky. What is this gas?
7. 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?
8. To test for the presence of chloride ions (Cl−) in a solution, which two reagents are typically added in sequence?
9. 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?
10. 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?
