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(1) activated carbon has adsorption, so replacing the old dry cleaning machine with a new dry cleaning machine with activated carbon can reduce the toxic substances to about 1/30;

(2) Detergent can wash away the oil stain on tableware, because detergent and oil stain are emulsified;

(3) The pH test paper is used to measure the pH of the solution. When goldfish eggs hatch, the pH value of water is very high. PH test paper is used to measure the pH of water in fish tanks.

(4) Sugar can provide energy, and athletes should take sugar to supplement energy after strenuous exercise;

(5) Sodium carbonate, commonly known as soda ash, can be used to make steamed bread and detergent.

So the answer is: (1) adsorption; (2) emulsification; (3)pH test paper; (4) sugar; (5) sodium carbonate.