The burning of magnesium ribbon involves the emission of light and heat. think of 2 more chemical changes which are accompanied by light or sound or heat
Answers
Answer:
Chemical reactions that release energy in the form of heat, light or sound are called exothermic reactions
Example : Mixture of sodium and chlorine to yield table salt
Na(s)+1/2Cl2(s)→NaCl(s)+ 411 kJ of energy.
Reactions that absorb energy or require energy in order to proceed are called endothermic reactions. For example : In the process of photosynthesis, plants use the energy from the sun to convert carbon dioxide and water to glucose and oxygen.
6O2(g)6CO2(g)+6H2O(l)→SunlightGlucoseC6H12O6(aq)+O
Answer:
OBSERVATIONS:
On burning in air, magnesium ribbon gives dazzling white flame and
changes into a white powder (magnesium oxide, MgO) as a result of
the reaction between magnesium and oxygen present in air.
Heat is also released in this reaction
The silver coloured Magnesium changes into white powdery ash.
The change can be represented by the following equation:
Magnesium(Mg) + Oxygen(O2) → Magnesium oxide (MgO)
On dissolving the ash in water it forms a new substance Magnesium
hydroxide which turns red litmus blue while blue litmus remains blue.
This change can be written in the form of the following equation:
Magnesium oxide(MgO) + Water(H2O) → Magnesium hydroxide Mg(OH)2
Explanation:
