Burning of Magnesium ribbon involves emission of light and heat. Think of two more chemical changes which are accompanied by light or sound or heat.
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Answer:
Smoldering Reaction- Accompanied by light
Water and Calcium Chloride Reaction- Accompanied by heat
Explanation:
Water and calcium chloride
Calcium chloride, water, and baking soda mixed together (the experiment is done by the students in their school labs) produce a rise in the temperature by letting off heat into the atmosphere. This process is also known as an exothermic reaction.
Initiation of residential fires on upholstered furniture by weak heat sources (e.g., a cigarette, a short-circuited wire).
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