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- 6. Explain the reason why a laboratory analyst should not return excess or unused chemicals back in their respective reagent bottles.الإنجليزية Q 6 / Is there a relationship between pressure and molecular weight? With mentioning the relationship and the type of their association, if any? Q 7/ How do you distinguish crystalline materials from non-crystalline materials? Q8/ Draw the cleavage curve. with his explanation10. help please use sig figs