CIE iGCSE Co-Ordinated Science C2.1 Elements, compounds and mixtures Exam Style Questions Paper 2
▶️ Answer/Explanation
Compounds are formed by chemical bonding (chemically bonded). They cannot be broken down by physical processes (e.g., filtration, distillation). Compounds have different properties from their constituent elements. So gap 1=chemically, 2=physical, 3=different. Option B.
✅ Answer: (B)
✅ Answer: (B)
▶️ Answer/Explanation
N2 represents a molecule made of two nitrogen atoms only, so it is an element, not a compound.
Ni is the symbol for nickel, a single metallic element.
Since both symbols represent single elements (one as a diatomic molecule, one as an atom), the correct description for both is “an element.”
✅ Answer: (D)
Ni is the symbol for nickel, a single metallic element.
Since both symbols represent single elements (one as a diatomic molecule, one as an atom), the correct description for both is “an element.”
✅ Answer: (D)
▶️ Answer/Explanation
An element is shown as particles of only one type (one colour/shape), while a compound is shown as particles containing two or more different atoms joined together.
A mixture of an element and a compound must show separate single-type particles alongside separate joined two-atom particles, not chemically combined.
Diagram B is the only one showing this combination correctly.
✅ Answer: (B)
A mixture of an element and a compound must show separate single-type particles alongside separate joined two-atom particles, not chemically combined.
Diagram B is the only one showing this combination correctly.
✅ Answer: (B)
▶️ Answer/Explanation
A molecule of a compound must contain two or more different types of atom joined together in fixed proportions.
Diagrams showing only one type of atom (whether single or joined) represent an element, not a compound.
Diagram B shows molecules made of two different atom types bonded together, representing a compound.
✅ Answer: (B)
Diagrams showing only one type of atom (whether single or joined) represent an element, not a compound.
Diagram B shows molecules made of two different atom types bonded together, representing a compound.
✅ Answer: (B)
▶️ Answer/Explanation
A mixture (P) can be separated by simple physical methods like filtration or distillation, since its components are not chemically bonded.
A compound (Q) requires a chemical process to break the bonds between its elements, while an element (R) cannot be broken down further at all.
✅ Answer: (D)
A compound (Q) requires a chemical process to break the bonds between its elements, while an element (R) cannot be broken down further at all.
✅ Answer: (D)