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This tool provides the best available enrollment advice applicable to the situation that you indicate. Personalized advice for unusual or special situations is always available in person by appointment. Use the appointment booking utility to book a one-on-one appointment with the Undergraduate Program Director.
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90-credit BSc Chemistry major
Honours Major Chemistry
Honours Double Major with Chemistry
Honours Major-Minor with Chemistry major
Honours Major Biochemistry
Honours Double Major with Biochemistry
Honours Major-Minor with Biochemistry major
Specialized Honours Chemistry
Specialized Honours Chemistry (Pharmaceutical & Biological stream)
Specialized Honours Biochemistry




looking to enroll in 2000-level courses
looking to enroll in 3000-level courses
looking to enroll in 4000-level courses

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      First, some general advice

  • An important thing to know is that, apart from CHEM 1000, 1001, 1100, 2020, 2021 and 4000, all other CHEM courses are offered only once a year and never in the summer.
  • Another consideration is that, after 2nd year, relatively few courses enforce their prerequisites. You will be able to enroll in those courses that don't, but it will be at your own risk. You will need to make up for any deficiencies in background preparation. The advice given here with regard to course selection and scheduling will always take account of prerequisites.
  • A third thing to consider is that all 2000-level CHEM courses are scheduled to not conflict with each other. The same is true for all 3000-level courses and all 4000-level courses. If you choose to delay a 2nd-year course to your 3rd year or, more generally, any course to a later year, you run the risk of encountering a scheduling conflict.
  • Summer terms, if you are able to use them, are good times to do courses like PHYS 1410/1420 or EECS 1520/1530/1540, as well as for other Science breadth courses of your choosing, General Education non-science courses and purely elective courses (NATS courses and courses you want to take out of interest). It's important to remember that some summer courses are compressed, meaning that they proceed at twice the normal pace. Compressed courses require good time management skills and no procrastination.
  • Finally, you might like to know that CHEM and BCHM course schedules don't change much from year to year, especially in 2nd and 3rd year, where the schedules are pretty firmly set. Only occasionally do 3rd- and 4th-year course schedules fluctuate. That means that you can usefully plan your schedule well ahead of time with the current schedule. However, we cannot guarantee that the same will be true of courses in PHYS, MATH or other subjects.

If you are uncertain as to what the requirements are for your degree program, you can consult and compare them here. The Progress Monitor tool has those requirements built in, so you can use that tool for plotting your progress and testing various scenarios looking into the future. If you save your work, you can come back to it and update it as you make progress through your degree and approach graduation.

Students in a Double Major or Major-Minor program and those undertaking a concurrent B.Ed. program will need to plan their upper-year courses more carefully than most because they will need to coordinate two sets of requirements. Feel free to consult with the UPD in an advising appointment.

Finally, feel free to speak to the UPD in a one-on-one advising session for clarification and individualized advice year 'round, or to email the UPD at chemupd@yorku.ca for simple questions.

      Now, some specific advice

If you have completed CHEM 1000 and 1001 as well as BIOL 1000 and 1001 (or have the equivalent from transfer credits), you can now enroll in the 2nd-year CHEM and BIOL/BCHM courses. The advice below assumes that you will be taking more or less a full course load.

Ideally, you want to be in a position to take 3rd-year courses in a year from now, so it is a good idea to look ahead to which 3000-level courses you need or want to take because you will need the appropriate 2000-level prerequisite courses. So, which 2000-level courses are most important to take now?

The program requires 3 CHEM and 4 BCHM/BIOL at the 2000 level, but some of these can be delayed without slowing your progress.

  • The best advice is to at least take CHEM 2020 and 2021, as well as BCHM/BIOL 2020 in your 2nd year so as to enable you to start taking some 3000-level courses a year from now. Specifically, these will allow you to take CHEM 3020, 3050 and 3051.
  • To access all of your required upper-year courses, BCHM/BIOL 2021, 2040 and 2070 should be taken as well. This is especially true for those in the Specialized Honours program, where CHEM 4050 needs BCHM/BIOL 2021 and where BCHM/BIOL 3110, 3130, 3140 and 4290 all need BCHM/BIOL 2021, 2040 and 2070. (Note that these 2000-level courses are all offered more than once a year, including in the summer.) If you must delay some of these, make sure to complete them as soon as possible if you're in the Specialized Honours program. If they are completed by the end of your 3rd year, then your upper-year required courses can be completed by the end of your 4th year, allowing you to then take BCHM 4000 as soon as the following summer.
  • If you are in the Honours Major program, BCHM/BIOL 2021, 2040 and 2070 should be taken by the end of your 3rd-year. This will allow you to complete your 3rd-year required courses by the end of your 4th year while also taking elective upper-year courses. Keep in mind that your BCHM/BIOL course choices in the upper years will be limited until your 2000-level BCHM/BIOL courses are completed.
  • The CHEM courses that can be delayed are CHEM 2011 and 2030. As they serve a foundational role, they are not prerequisites to any of your required courses, but they are prerequisites to some optional upper-year CHEM courses, such as CHEM 3011 or 3030, that you could choose to complete the upper-year requirement.
Here are the details:
  • Every Biochemistry major will need to take BCHM/BIOL 3110 and 3130, usually in 3rd year. Those in the Specialized Honours program will additionally need to take BCHM/BIOL 3140, which prerequires BCHM/BIOL 3110 and 3130. BCHM/BIOL 3140 is often expected as preparation for the 4th-year research project course (BCHM 4000), depending on the project. You could delay BCHM/BIOL 3140 to your 4th year and then do BCHM 4000 the following summer or in a 5th year.
  • CHEM 2021 and BCHM/BIOL 2020 together give access to the the required courses CHEM 3020, 3050 and 3051 as well as to some 3000- and 4000-level CHEM/BCHM courses that can be taken as electives, such as CHEM/BCHM 3071, 4050 and 4051, as well as several pure CHEM courses, such as CHEM 3070 and 3090.
  • Students in the Specialized Honours program only need to choose 3 upper-year electives in CHEM, BCHM or BIOL, and the program's required courses give access to an ample selection.
  • Those in the Honours Major program will need to choose at least 12 credits of 4000-level CHEM, BCHM or BIOL courses. Some of those 4000-level courses will perhaps have additional 3000-level prerequisites. Even if this not the case, students in this program may need another 15 upper-year credits in any and all subjects to complete the upper-year requirement. Those credits could of course be part of a second major in a Double Major program or a minor in a Major-Minor program.
The study plans on the Chemistry website take all of this information into account, so can be consulted during your academic planning, in conjunction with the published course schedules.

If you have completed CHEM 1000 and 1001 as well as BIOL 1000 and 1001 (or have the equivalent from transfer credits), you can now enroll in the 2nd-year CHEM and BIOL/BCHM courses. The advice below assumes that you will be taking more or less a full course load.

Ideally, you want to be in a position to take 3rd-year courses in a year from now, so it is a good idea to look ahead to which 3000-level courses you need or want to take because you will need the appropriate 2000-level prerequisite courses. So, which 2000-level courses are most important to take now?

The program requires 5 CHEM and 4 BCHM/BIOL at the 2000 level, but some of these can be delayed without slowing your progress.

  • The best advice is to at least take CHEM 2020 and 2021, as well as BCHM/BIOL 2020 in your 2nd year so as to enable you to start taking some 3000-level courses a year from now. To keep all of your upper-year options open, BCHM/BIOL 2021, 2040 and 2070 should be taken as well. Note that these are all offered more than once a year, including in the summer.
  • Some delay of these BCHM/BIOL courses is OK, depending on what upper-year option you choose, or if you are able to take summer courses or if you plan on staying past 4 years anyway. If you must delay some of these, delay only BCHM/BIOL 2021, 2040 and/or 2070, because they are prerequisites to only a few of the courses that you will need to take later.
  • The CHEM courses that can be delayed are CHEM 2011, 2030 and 2080, although you might not want to delay all three.
  • Unless you want to stay an additional year, your 2000-level courses should all be completed before you start your 4th year. That way, you'll be able to complete the 3000-level requirements in your 4th year and take CHEM 4000 the summer after or in a fifth year. The reason is that the program will require you to take at some point CHEM 3011 (which pre-requires CHEM 2011), CHEM 3030 (which pre-requires CHEM 2030) and CHEM 3080 (which prerequires CHEM 2080), as well as CHEM 3000 and 3001 (which pre-require CHEM 2011, CHEM 2021, CHEM 2030 and CHEM 2080). Note that CHEM 2011, 2030 and 2080 are only offered once a year.
Here are the details:
  • Every Chemistry major will need to take CHEM 3000 and 3001, usually in 3rd year. Since you will need to do the 4th-year research project course (CHEM 4000), you can delay CHEM 3000 and 3001 to your 4th year and then do CHEM 4000 the following summer or in your 5th year (fall-winter).
    The prerequisites for CHEM 3000 are CHEM 2021 (which prerequires CHEM 2020), 2030 and 2080 with CHEM 2011 as corequisite or prerequisite – in other words, you'll need every 2000-level CHEM course except CHEM 2050. While it may be possible to get permission to take CHEM 3000/3001 if you are missing a prerequisite (CHEM 2011 is the least important prerequisite), there is no guarantee.
  • CHEM 2021 and BIOL 2020 (or CHEM 2050) give access to the greatest number of 3000- and 4000-level courses, and so are important.
    The following courses all pre-require CHEM 2021: CHEM 3020 (and, later, 3021 and 4021), 3030 (and, later, 3031, 4030 and 4031), 3050, 3051, 3070, 3071, 3090, 4024, 4050 and 4051. Of these upper-year courses, the program requires CHEM 3020, 3030, 3050, 3051, 3071 and 4050.
    The following also pre-require BCHM/BIOL 2020 (or CHEM 2050): CHEM 3050, 3051, 3071, 4050 and 4051.
  • This program requires you to choose from three course combinations, depending on your preference:
    • CHEM 3021 3.0 and 4021 3.0 for those more interested in organic synthesis; this choice requires that CHEM 2021 (and 2020) be taken in 2nd year, then CHEM 3020 and 3021 in 3rd year before taking CHEM 4021 in 4th year
    • CHEM 3021 3.0 and 4051 3.0 for those equally interested in organic synthesis and biological chemistry; both of these courses can be taken in 4th year, so this choice allows either CHEM 2021 or BCHM/BIOL 2020 or both to be delayed to 3rd year
    • CHEM 4051 3.0 and either BCHM/BIOL 3110 3.0 or BCHM/BIOL 4151 3.0, for those more interested in biological chemistry; BCHM/BIOL 4151 pre-requires BCHM/BIOL 2020 and 2021 courses but BCHM/BIOL 3110 pre-requires all four 2000-level courses, BCHM/BIOL 2020, 2021, 2040 and 2070
    • Note that most of the courses in these options are only offered once a year.
    Given that you probably don't know now which of these options you will make, the safest advice is to keep all options open by taking CHEM 2020 and 2021, as well as BCHM/BIOL 2020, 2021, 2040 and 2070. Note that these are all offered more than once a year, including in the summer.
The study plans on the Chemistry website take all of this information into account, so can be consulted during your academic planning, in conjunction with the published course schedules.
© 2019 Pierre G. Potvin, York University