I guess I can help a little, I'm doing the same course
Some of the Science electives you can undertake I found were listed in the First Year Planer (myUNSW enrolment tools). They are (as taken from that page):
Semester One
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/BIOS1201.html">BIOS1201</a> Molecules, Cells and Genes
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/CHEM1011.html">CHEM1011</a> Fundamentals of Chem 1A
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/CHEM1031.html">CHEM1031</a> Higher Chemistry 1C
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/GEOS1111.html">GEOS1111</a> Fundamentals of Geology
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/MATH1081.html">MATH1081</a> Discrete Mathematics
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/HPSC1100.html">HPSC1100</a> Cosmos and Culture
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/HPSC1400.html">HPSC1400</a> Science, Technology & Society
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHIL1010.html">PHIL1010</a> Thinking About Reasoning
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHIL1014.html">PHIL1014</a> Intro to European Philosophy
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHYS1111.html">PHYS1111</a> Fundamentals of Physics
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHYS1121.html">PHYS1121</a> Physics 1A
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHYS1131.html">PHYS1131</a> Higher Physics 1A
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PSYC1001.html">PSYC1001</a> Psychology 1A
or another approved course
Semester Two
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/BIOS1101.html">BIOS1101</a> Evolutionary & Functional Bio
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/CHEM1021.html">CHEM1021</a> Fundamentals of Chem 1B
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/CHEM1041.html">CHEM1041</a> Higher Chemistry 1D
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/GEOS1211.html">GEOS1211</a> Environmental Earth Science
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/MATH1081.html">MATH1081</a> Discrete Mathematics
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/HPSC1200.html">HPSC1200</a> Science Good, Bad and Bogus
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/HPSC1500.html">HPSC1500</a> Understanding Environment
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHIL1007.html">PHIL1007</a> Knowledge and Reality
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHIL1008.html">PHIL1008</a> Ethics and Society
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHYS1131.html">PHYS1131</a> Higher Physics 1A
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHYS1221.html">PHYS1221</a> Physics 1B
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PHYS1231.html">PHYS1231</a> Higher Physics 1B
<a href ="http://www.handbook.unsw.edu.au/undergraduate/courses/2005/PSYC1011.html">PSYC1011</a> Psychology 1B
or another approved course
Hope that helps a little!