Question

21. The attractive forces among particles in _______ are the weakest. (Knowledge) A. solids B. liquids C. gases D. none of these 22. Paper chromatography is most useful as a technique used by crime investigators. What situation would it be used in? (Knowledge) A. determining the contents of a diary B. finding fingerprints on a newspaper C. determining the ingredients of ink on a ransom note D. selecting the correct DNA of a suspect 23. What is the difference between a hydraulic system and a pneumatic system? (Knowledge) A. Hydraulic systems compress air, whereas pneumatic systems do not. B. Hydraulic systems use air, whereas pneumatic systems use an enclosed liquid. C. Hydraulic systems use an enclosed liquid, whereas pneumatic systems use air. D. There is no real difference between the two systems. 24. An inflated balloon is an example of an enclosed fluid transmitting pressure equally in all directions. The scientist that discovered this phenomenon was: (Knowledge) A. Joule B. Pascal C. Watt D. Newton 25. Sally is very thirsty for a glass of iced tea. Which of the following would NOT be a good method for increasing the dissolving rate of the iced tea crystals? (Application) A. stirring B. heating C. grinding them smaller D. exposing them to light

Answer 1

21 ans gases.
24 ans I think it would be Pascal