iGCSE Chemistry (0620) Core:2.1 Elements, compounds and mixtures: Exam Style Questions Paper 1- New Syllabus
▶️ Answer/Explanation
Detailed solution:
A mixture of an element and a compound must show particles of a single element (like diatomic molecules or single atoms of one type) mixed with particles of a compound (two or more different atoms chemically bonded). In option D, you see one type of atom (element) alongside molecules made of two different atoms bonded together (compound), and they are not chemically combined with each other, which fits the description of a mixture perfectly.
▶️ Answer/Explanation
Detailed solution:
The brown solid conducting electricity is a classic property of a metal. Since a blue solution also forms, it means part of the solid dissolved while the metal part did not. A pure compound or a pure metal would not separate into two distinct parts like this. The only explanation is that Y is a mixture, containing a soluble blue salt and an insoluble brown metal.
▶️ Answer/Explanation
Detailed solution:
The question wants a mixture made specifically from one element and one compound. Aqueous glucose is glucose (a compound) dissolved in water (another compound), so that is two compounds. Clean dry air and stainless steel are both mixtures of many different elements and compounds. Oxygen dissolved in distilled water is simply oxygen molecules (an element) mixed with water molecules (a compound), fitting the description perfectly.