Evaporation of water only increases the distance between water molecules, but the water molecules themselves do not change. It is therefore a physical change. When water is electrolyzed, water molecules are electrolyzed into hydrogen atoms and oxygen atoms. hydrogen atoms are combined into hydrogen molecules and oxygen atoms combine to form oxygen molecules, hydrogen molecules come together to form hydrogen gas and oxygen molecules come together to form oxygen, so it is a chemical change.
What is removed by evaporation is the water from the solvent and the solute is obtained.
< p>Distillation collects the vapor coming out of the liquid and cools it to obtain a pure liquid.The evaporation method is used for. Separate FeCl3 and H2O by heating, but the water should be evaporated under the protection of hydrogen chloride gas to prevent fer to hydrolyze the ions.
Heating water is a physical change. Water molecules continue to expand when heated. molecules do not break down and produce new molecules.
Water electricity is a chemical change when water molecules are electrified, broken down into hydrogen atoms and atoms of oxygen, then combined to produce hydrogen molecules and oxygen molecules. , these two new molecules