What will happen to the surface tension of water droplets when a surface-active agent is added?
a. Nothing will hap-pen. c. It will decrease.
b. It will increase. d. It will be eliminat-ed.
ANS: C
Surface tension is the force exerted by like molecules at the liquid's surface. The introduction of a surface-active agent (e.g., soap) would decrease the cohesive forces between the water drop-lets, thus reducing their surface tension at the surface. With liquids (e.g., water), surface tension can be made to increase or decrease, but it cannot be eliminated. See Figure 1-9.
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______________________________ All medical offices and institutions have emergency preparedness plans in place for medical assistants to follow
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