Question

By which of the following conditions a chemical reaction taken place can be represented? 1. evolution of gas 2. heat released 3. change in colour 4. all of these​

Answer 1

All of these..............

Answer 2

Answer:

4. All of these​

Explanation:

• Electrons receiving energy and being excited are what give chemicals their colour. Lightwaves are absorbed by that stimulation, and we observe the complementary hue of the absorbed lightwaves.
• When bonds are created in the products of exothermic processes, more energy is produced than is required to break the bonds between the reactants. The temperature of the reaction mixture rises as a result of exothermic reactions.
• A chemical process known as a "gas evolution reaction" produces a gas as one of its byproducts, such as oxygen or carbon dioxide. When the resulting gases are explosive or dangerous when breathed, gas evolution processes may be conducted in a fume chamber.

#SPJ3