November 11, 1918. World War I Ends. ...
January 30, 1933. Hitler Appointed German Leader. ...
September 1, 1939. World War II Begins. ...
September 17, 1939. Soviet Union Invades Poland. ...
September 27, 1939. Warsaw Captured. ...
December 13, 1939. UK Wins War's First Sea Battle. ...
April 8, 1940. ...
May 10, 1940.
First you should know that a dependent variable is the one which its values depends of the ones of other variable. In this case, <em>the final mass is the dependent variable</em> because this amount directly depends on how much acid the scientist pours in the initial mass to increase or decrease it. This is also why she remeasures it once the experiment is done.