The Finale

Act IV:
1.) The scene starts off as Iago plots his next move in convincing Othello that Cassio has been sleeping with Desdemona wherever, whenever, and however he wants. Iago then tells Othello to hide and listen to Cassio and Iago's conversation as Iago brings up about Bianca, which to Othello is mistaken as Desdemona and how Bianca loves Cassio. He laughs about this story and Othello hidden, was outraged.
2.) The handkerchief seems to represent the evidence of fidelity of Desdemona. If it is beside her or is in another possession then for Othello means infidelity of Desdemona. I feel like Othello is only getting his suspicions through a piece of superstitious item that represents loyalty. If the handkerchief is being passed around from one person to another then that will probably consider Desdemona a whore as Othello has cried to her about.
3.) What prevented Othello from being moved is how Desdemona continuously denying how unfaithful she is without actually proving Othello that she isn't a whore. She keep denying it even though Othello is on a frenzy that he won't believe her.
5.) The conversation between Emilia and Desdemona shows how similar these two characters are. Desdemona is finally facing the same treatment as Iago treats Emilia. It seems as though that Desdemona is Emilia's foil and how Emilia tells Desdemona to be strong and be a strong woman.
6.) I believe the memorable dramatic irony is within the song that Desdemona sang. In the last line when she says, "Let nobody blame him, his scorn I approve— Nay, that’s not next," Desdemona mistakenly forgot the last line and evidently, means that she accepts the scorn of Othello and that she will die by him. However, from this line, she still didn't blame him for killing her.
Act V:
1.) Iago's villainy becomes evident as his own wife points out the mastermind of this tragedy. After the death of Desdemona, Othello finally tells Emilia that Iago, her husband, has told him about the handkerchief. Emilia then realizes that its her husband who did this sinful act and rushes to confine him. What actually led to Iago's unmasking was the two letters of Roderigo before he died about the events in getting Cassio out of the position and onto Othello's kill list. Then Cassio confesses to Othello that Iago was the one who got him demoted by getting him drunk. Iago then kills Emilia and runs off.
4.) I believe what led Othello to kill Desdemona is the excess idealism. He urge himself on to kill this white beauty as he is hesitant in doing so, but to protect the love of men for women, he has to kill this "whore-keeper." He also trusts men more than he trusts women because if he actually love Desdemona then he should only believe none other except his own naked eyes.
5.) Othello knew only to love Desdemona's beauty rather the love of heart of Desdemona. He only concentrated on the amount of love that Desdemona gives him, but not the quality of love(how deeply she loves him).
6.) I would agree that his little speech before his death gave back his dignity and nobility because he finally unfolds the blindness of his eyes that kept him from seeing the love that he had. Othello, according to Cassio, was "great of heart" and I truly agree to that. He not other love his friends and beloved so dearly that he loved them too much that brought his pain and suffering in the end. He was easily manipulated and trusts everything other "trustworthy" men were saying.