An emergency ordinance is an ordinance which, in the judgment of the Council, is necessary for the immediate preservation of peace, health, or safety, and which shall become effective immediately upon passage and approval unless it specifies a later time. Every such ordinance shall contain, as part of its title, the words: “and declaring an emergency;” and in a separate section herein called the emergency section shall declare the emergency setting forth the general facts constituting the emergency. The Council shall vote on the emergency section separately, and must adopt the section by a vote of at least three-fourths (3/4) of all its members, which vote shall be by yeas and nays and entered in the journal.