For which film did Jennifer Lawrence win the Oscar for Best Actress?

Who won the Oscar for Best Actress for 'Black Swan'? For which film did Natalie Portman win the Oscar for Best Actress? Who won the Oscar for Best Actress for 'The Iron Lady'? Who won the Oscar for Best Actress for 'Silver Linings Playbook'? Who won the Oscar for Best Actress for 'Blue Jasmine'? For which film did Cate Blanchett win the Oscar for Best Actress? Who won the Oscar for Best Actress for 'Still Alice'? For which film did Julianne Moore win the Oscar for Best Actress?