Classify the following as physical or chemical properties:
- The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
- Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
- Metallic sodium is soft enough to be cut with a knife.
- Most metal oxides form alkalis on interacting with water.
Answer:
Physical properties—1 and 3
Chemical properties—2 and 4