Grade 7 Chemistry All Class Assessment and Revision of Examination
Grade 7 Chemistry All Class Assessment and Revision of Examination 1. ---------------------- is a natural rock a) Element b) Ore c) Atom 2. The metal in ores are chemically bonded to other ------------------ d) Element e) Ore f) Atom 3. The least reactive ones are at the ----------------- g) tope h) middle i) bottom 4. Ores are rocks from which it is economical to extract metals that they contain. A) True B) False 5. The least reactive ones are at the top A) True B) False j) Most metal are found naturally in --------------------------- called ores. A. Element B. rocks C. Atom k) Gold is very expensive because it is ----------------------to find. A. difficult B. easy C. both A & B l) ---------------- is a process of heating an ore to a high temperature in the presence of air. A. Blasting B. Roasting C. Mel