What isthe essential characteristic of colloid?
A: Tyndall effect
B: Brownian motion
C: Colloidal particles size ranges from1nmto 100nm
D: colloidal particles charged
A: Tyndall effect
B: Brownian motion
C: Colloidal particles size ranges from1nmto 100nm
D: colloidal particles charged
举一反三
- Which of the following statements is false: ( ) A: Suspended solids are unstable and can be easily removed from the water. B: The colloidal particles are usually charged by adsorbing ions. C: The sizes of dissolved matters are less than 1 nm. D: The pollution of natural water only comes from the natural environment.
- The efficiency of coagulation process is not good during the condition of low temperature, because ( ) A: coagulants will not hydrolyze completely B: the hydration of colloidal particles is enhanced, which hinders the coagulation process C: the viscosity of water is high, so the Brownian motion is weak, making it difficult for colloids to aggregate D: The rate of coagulants hydration is too high
- What are the drugs that are often used jointly to destroy helicobacter pylori? A: Omeprazole + clarithromycin + amoxicillin or metronidazole B: Colloidal al-magnesium mixture + colloidal bismuth subcitrate + lansoprazole C: Ranitidine + sucralin + prostaglandin E D: Colloidal bismuth subcitrate + prostaglandin E+ sucraland
- So small () that the most powerful microscopes cannot detect them. A: are these particles B: were these particles C: these particles are D: these particles were
- The amount of scattering that occurs depends on the ( ). A: Size of particles B: Radiation wavelength C: Quantity of particles D: How deep the energy passes through the atmosphere