Complex substances consist of atoms of different elements, therefore, when they decompose, new substances can be obtained. This phenomenon is based on a chemical phenomenon.
Decomposition of mercury (II) oxide is orange. observes a color change to black – mercury is formed, and a gas is also released – oxygen.
2HgO = 2Hg + O2
When chalk decomposes, carbon dioxide is released:
CaCO3 = CaO + CO2
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.