If you enrol in the BSci and don't take ENGG1800, ENGG1801 or CHNG1103 in first year, than you would probably have to add an extra year as CHNG1103 is a prereq to start any 2nd year chem eng units.
You also have to ensure you take MATH1001, MATH1002, MATH1003 and MATH1005 in the first year of...