Can simple substances be formed during chemical reactions: 1. compounds 2. splitting 3. substitutions 4. exchange explain by examples.
Answer: 1. no; 2. yes; 3. yes; 4. no.
Explanation of the solution to the problem:
1. A compound reaction is a reaction, as a result of which one complex is formed from simple substances, therefore the answer is no: Ca + O2 => CaO.
2. The cleavage reaction is, on the contrary, a reaction, as a result of which several simple ones are formed from a complex substance, so the answer is yes:
2H2O => 2H2 + O2.
3. As a result of the substitution reaction, simple substances are formed, which before the reaction were in the composition of a complex compound: Mg + H2SO4 => MgSO4 + H2.
4. The answer is no, because an exchange reaction is a reaction between complex substances, and as a result other complex substances are formed:
CuO + H2SO4 => CuSO4 + H2O.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.