Give examples of practically pure substances that you encounter in everyday life.

Snow – it contains almost no impurities, unlike ordinary water.
Gold and silver jewelry.
Sugar – It consists only of sucrose.
Carbon dioxide that we breathe out.
Marble – consists only of CaCO3 calcite.
Aluminum – cookware and food foil.

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.