Healthy water use day

(1) Water cycle is realized through the three-state change of water. The sun provides energy for the water cycle, and garbage is discarded at will, causing water pollution. Therefore, it is wrong to throw away garbage at will without causing water pollution.

Therefore, choose c;

(2) After adding soapy water to hard water, there is little foam and white scale, so it is found that there is little foam and white scale when washing clothes with well water, so well water is hard water.

(3) Pure water can be obtained by distillation, and its purification degree is the highest.

(4) The method of distinguishing hard water from soft water is: using soapy water or heating, heating and boiling can reduce the hardness of well water; So, the answer is: heat and boil;

(5) Water generates hydrogen and oxygen when charged, and the chemical equation is 2H2O? Turn it on? . ? 2H2↑+O2↑; The reaction of one substance produces two substances, which belongs to decomposition reaction; So the answer is: 2H2O? Turn it on? . ? 2H2↑+O2↑; resolve

(6) There are many common measures to save water in life, such as: multi-purpose water, watering flowers with fine vegetables, and repairing leaking faucets in time. So, the answer is: wash vegetables and water flowers.