EVERYDAY SCIENCE

Detailed explanation-1: -The formation of a gas is the third sign that a reaction may have occurred. The formation of bubbles when two liquids are mixed usually indicates that a gas has formed. A gas can also be formed when a solid is added to a solution.

Detailed explanation-2: -Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Detailed explanation-3: -Sometimes a chemical reaction produces a gas as one of its products. When this happens, we can observe bubbles or fumes. An example of a chemical reaction that produces a gas is the reaction between baking soda and lemon juice (citric acid).

Detailed explanation-4: -A gas evolution reaction is a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide. Gas evolution reactions may be carried out in a fume chamber when the gases produced are poisonous when inhaled or explosive.

Detailed explanation-5: -Answer and Explanation: In every chemical reaction, reactant compounds combine to form products. The formation of new compounds is a chemical reaction, much like the formation of a solid. An indication of a chemical reaction is the creation of a new compound, which is a gas.