Give one example each of which illustrates the following characteristics of a chemical
reaction:
(a) evolution of a gas
(b) change of colour
(c) change in state
Answers
Answer:
(a) evolution of a gas-A common type of gas evolution reaction is an acid-base reaction, where an acid mixes with a base to produce water and carbon dioxide. ... For example, carbonic acid breaks down to water and carbon dioxide, sulfurous acid breaks down to water and sulfur dioxide, and ammonium hydroxide breaks down to water and ammonia gas.
(b) change of colour-In this reaction when iron reacts with copper sulphate, copper sulphate is blue in colour change into green in colour called iron sulphate as a result of displacement reaction. ... when Barium Chloride reacts with sodium sulphate it forms Barium sulphate as a precipitate.
(c) change in state-Changes of state are physical changes in matter. They are reversible changes that do not change matter's chemical makeup or chemical properties. For example, when fog changes to water vapor, it is still water and can change back to liquid water again.
Answer:
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