SELAMAT DATANG Kuiz Sains Tambahan Tingkatan 5 Bab 2 Set 1
Penerokaan Unsur Dalam Alam (English)
KUIZ INI MENGANDUNGI 10 SOALAN
1.
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?
2.
During the preparation of copper(II) chloride from copper(II) oxide and hydrochloric acid, why is the copper(II) oxide powder added in excess?
3.
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?
4.
When solid zinc carbonate (ZnCO3) is heated strongly, it undergoes thermal decomposition. What are the expected products?
5.
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?
6.
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?
7.
What is the most suitable method for preparing an insoluble salt like lead(II) sulfate (PbSO4)?
8.
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?
9.
Which of the following methods is most suitable for preparing a pure, dry sample of the insoluble salt lead(II) iodide (PbI2)?
10.
A gas produced during a chemical reaction is tested by bubbling it through limewater, which turns milky. What is this gas?
