2019 Competition


Individual Round Solution

Answer Key of Individual Round has been posted. Appeal deadline has been past.

Updates:

6c) Ester resonance is also possible

5c) Due to notation issues L4*(L2- T)-1 will also be accepted

2a) Silver (I) Diammine and Diammine silver (I) are also accepted

2d) In reality a carboxylate will be deprotonated and the example reaction given is wrong. Both the answers with COOH and COO- will be accepted.

3a) Remove “an odd number of electrons” from answer key as diradicals exist.


Chemistry of Cleaning Solution

Answer Key of Topics Round has been posted. Appeal deadline has been past.

Updates:

2.b Also accepted UV/Blue/green

3.b. Also accepted:

4.e. Answer should read “It has a polar CO dipole but also hydrophobic methyl groups making it versatile in dissolving both polar and non-polar substances.”


Chemistry of Art Solution

Answer Key of Topics Round has been posted. Appeal deadline has been past.

Updates:

1.b.v. Also accepted -0.38 as reduction potential

2.3.iii answer key correction: “K = e5840 = extremely large”

2.h Also accepted: Over a thousand years, there would still remain a significant amount of C-14 compared to pre-1945, so the technique can still be used with about equal effectiveness.

4.a.ii answer key correction: “Cu(s) + Cl-(aq) → CuCl(s) + e-

4.b.i. Also accepted 2H+ + 2Cl- in place of 2HCl


Chemistry of Ocean Solution

Answer Key of Topics Round has been posted. Appeal deadline has been past.


Team Round Solution

Answer Key of Team Round has been posted. Appeal deadline has been past.

Updates:

3ai: The numerator and denominator for Q should be flipped. The final answer should be -16.9 kJ.

4f: Answer should be ln(k) = -ΔH/RT + ΔS/R


Individual Round Sample Problems

Individual Round Sample Solutions

This exam may test a broad set of general chemical concepts, requiring both numerical answers or written justification. The span of topics will closely follow that of the individual exams from WUCT 2018, but condensed into a single 1-hour exam.


Chemistry of Cleaning Sample Problems

Chemistry of Cleaning Sample Solutions

A group of two students will work together on this exam. The topic exam centered around cleaning will focus on the incorporation of chemistry into daily and industrial cleaning agents with the end goal of educating students on how these ubiquitous objects work from a chemical perspective.


Chemistry of Art Sample Problems

Chemistry of Art Sample Solutions

A group of two students will work together on this exam. Introductory chemical principles will be applied to various mediums of art. Prior knowledge of drawing, painting, sculpting, etc. will not be required to successfully complete this exam.


Chemistry of Oceans Sample Problems

Chemistry of Oceans Sample Solutions

A group of two students will work together on this exam. This exam will test basic chemical principles as they relate to the chemistry of marine environments, including but not limited to its constituents, ecology, and climate change.


Team Round Sample Problems

Team Round Sample Solutions

Like the individual round, this exam may test a broad set of general chemical concepts. As all six students are allowed to work on this exam, though, the questions will require more in-depth interrogation of the ideas behind each problem. Sample problems are from WUCT 2018, but the exam format and topics covered will be similar.


Breaking Bonds Sample Problems

Breaking Bonds Sample Solutions

Each team will choose a packet of 3 questions of a certain level of difficulty (easy, medium, hard) to answer at a time. Upon completion of the questions, the entire packet will be turned in and a new question set can be chosen, at any difficulty level. These questions will be drawn from a broad range of general chemistry topics. Sample problems are from WUCT 2018, but the exam format and topics covered will be similar.