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Anonymous users2024-01-24A. Sucrose has a sweet taste, salt has a salty taste, and the taste can be distinguished, so A is correct;
B. There is a large amount of scum when hard water is mixed with soapy water, and a large amount of foam is produced when mixed with distilled water, so it can be identified by using soapy water, so B is correct;
C. Ammonium nitrate is dissolved in water to absorb heat, and sodium hydroxide is dissolved in water to release heat, and the phenomenon is different, so it can be identified with water, so C is correct;
D. Oxygen and carbon dioxide are colorless gases, and the color cannot be identified by observation, so D is wrong, so D is chosen
A. Sucrose has a sweet taste, salt has a salty taste, and the taste can be distinguished, so A is correct; >>>More
A. One water is used for multiple purposes, which can save water resources, correct >>>More
A mistake: After washing the oil stain with the detergent, it cannot form a real solution, but only an emulsion. It is an oil-water emulsion.
3. Unscrew the cap of the vinegar bottle, the vinegar molecules are doing irregular movement, so we can smell it, the statement is correct, and it does not meet the topic; >>>More
A. When stewing meat, the fragrance is fragrant, and the meat molecules are doing irregular movements, so we can smell it, which is correct and does not meet the topic; >>>More