Please fill in the correct answers into the blanks in the following passage. Another striking difference with respect to the behavior of a polymer an d【空1】 of a low molecular weight compound concerns the dissolution process. Let us take, for example, sodium chloride and add it slowly to a fixed【空2】of water. The salt, which represents a【空3】molecular weight compound, dissolves in water up to a point (called 【空4】 point ) but, thereafter, and further quantity added does not go into solution but settles at the 【空5】and just remains there as solid. The viscosity of the saturated salt solution is not very 【 空6】 different from that of water. But if we take a polymer instead, say, polyvinyl alcohol, and add it to a fixed quantity of water, the polymer does not go into solution immediately. The globules of polyvinyl alcohol first 【空7】 water , swell and get distorted in shape and after a long time go into solution.