11. State the use of any five named non-metals

List four observations that indicate that a chemical reaction may be taking place

Balance the following reaction. as2s3 + 9o2 → 2as2o3 + so2

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?