Pls help me out on number 4 and 6 vid; Chemical Reactions that Changed History

What is impossible to do with a hypothesis

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Give the set of reactants (including an alkyl halide and a nucleophile) that could be used to synthesize the following ether: draw the molecules on the canvas by choosing buttons from the tools (for bonds and charges), atoms, and templates toolbars, including charges where needed. ch3ch2och2ch2chch3 | ch3