Changes of physical state in the twenty-four solar terms

(1) sublimation, liquefaction, sublimation, melting (2) liquefaction, sublimation.

(3) There are many answers, such as: turn off the tap when not using water; Flush the toilet with flushing water; ..... Students can score if their expressions are basically correct.

1, the definition of state change

2, solid into liquid, liquid into gas endothermic, and vice versa.

3, a, washing vegetables with rice washing water, and then washing with clear water, which not only saves water, but also effectively removes pesticide residues on vegetables;

4.b. Wash the mop, sweep the floor and then flush the toilet. The second washing water for washing clothes cleans doors and windows, furniture, shoes and socks, etc.

5, c, flush the toilet after urinating, try not to open the big water pipe for flushing, and make full use of the used "dirty water";

6. D. Sprinkle water on the indoor and outdoor ground in summer to cool down, try not to use clean water, and use washing water after washing;

7, e, bicycle, family car cleaning, don't rinse with water, to wipe with a wet cloth, too dirty place, also want to use the remaining water after washing clothes;

8、?

Comments: The change of physical state is a compulsory knowledge in the senior high school entrance examination. We should start with the definition and firmly grasp it.