Compounds that have the same molecular formula but different chemical structures are called isomers. Remember isomerism is a property between a pair (or more) of molecules, i.e. a molecule is an isomer of another molecule. A similar relationship is that of brother or sister...
Many Americans are up in arms. But in fact, keeping out desperate souls seeking entry into America has deep roots. On this day 100 years ago, the United States passed the strictest immigration law of its time: the Immigration Act of 1917. The law restricted the immigration of undesirables, including many people from the Middle East and Asia, through increased taxes, tests and outright bans.
1 The Page Act of 1875 was the first act restricting immigration. 2  The Immigration Act of 1882 imposed a 50 cent head tax to fund immigration officials. 3  The Chinese Exclusion Act (1882) allowed the U.S. to suspend Chinese immigration, a ban that was intended to last 10 years. The Immigration Act of 1882 imposed a 50 cent head tax to fund immigration officials. 2  The Chinese Exclusion Act (1882) allowed the U.S. to suspend Chinese immigration, a ban that was intended to last 10 years.