Unformatted text preview: 8. Blood is a suspension of blood cells in blood plasma. \ If blood is
treated so that it doesn’t clot and is then placed in a test tube, will the
blood cells settle? 9 £5 9. What causes blood cells to settle? g lravi -l’ L] Colloids .
Colloids consist of very tiny particles suspended in a liquid, usually
water. (Colloids may also be suspended in solids and in gases.)
Colloids differ from suspensions in that colloids do not settle. Colloidal
dispersions are usually translucent or milky white. They do_not pass
through membranes. One example of a colloid is protein. («75:11) 10. A colloidal dispersion of protein will be +V3ﬂ5lum+
(transparent/translucent). 11. A colloidal dispersion of protein W‘ H “0+- (will/will not) settle. 17. A colloidal dispersion of protein w} H “0+ (will/will not)
pass through a membrane. 18. Many proteins are colloids. Should such proteins be able to pass
through the membranes of the kidneys and be present in the urine? LQ 19. Should salt, NaCl? 90, 5
D iffusion X If a bottle of perfume is opened in a room, the odor is soon apparent
throughout the room. The molecules of perfume diffuse, or spread out, into the available volume of air. Next, suppose a sugar solution is placed on one side of a permeable
(nonselective) membrane and pure water is placed on the other side of that membrane. ...
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- Fall '08