• what substances enter into a chemical reaction and what substances are formed as a result of it;
• the number of molecules (formula units) of reagents and the number of molecules (formula units) of the reaction products;
• the amount of substance of reagents and reaction products corresponding to the coefficients in front of their formulas in the equation and, therefore, the quantitative relations between the participants in the chemical reaction;
• type of chemical reaction.
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.