Combination reactions Skill building Work Sheet 1 Heating of iron powder with Sulphur. Observation: Word reaction: Chemical reaction ( write symbol and formulas ) Balanced chemical reaction: ------------------------------------------------------------------------------------------------2 Burning of magnesium ribbon in air: Observation: Word reaction: Chemical reaction ( write symbol and formulas ) Balanced chemical reaction: 3 Heating of iron powder with Sulphur. Observation: Word reaction: Chemical reaction ( write symbol and formulas ) Balanced chemical reaction: