Chemistry Lab C

Skink
Exalted Member
Exalted Member
Posts: 948
Joined: February 8th, 2009, 12:23 pm
Division: C
State: IL
Has thanked: 0
Been thanked: 3 times

Re: Chemistry Lab C

Post by Skink » January 15th, 2018, 10:11 am

Nerd_Bunny wrote:How is everyone studying for physical properties? Since this topic hasn't been in rotation for a while I'm having trouble finding any resources to help study.
This subtopic really has me thrown. Like, are we going as far as Ksp for solubility, or is it B division-grade conductivity measurements, for example? It's so hard to get a read for what they're going for with this when B division goes introductory high school while this event doesn't want to go AP level.

User avatar
gryphaea1635
Member
Member
Posts: 33
Joined: April 4th, 2015, 4:04 pm
Division: C
State: MA
Has thanked: 0
Been thanked: 0

Re: Chemistry Lab C

Post by gryphaea1635 » January 15th, 2018, 7:14 pm

I was trying to do slowpoke's SSS chem lab test, and I don't know how to do 2c of the thermodynamics open response. Can someone explain it for me? It says to calculate the standard enthalpy of formation for liquid benzene, given dH(f) for gaseous benzene is 82.9 kJ/mol.

Other givens are: dS for vaporization of benzene is -90.91 J/(mol*K), enthalpy of vaporization is -32.11 kJ/mol, its boiling point is 353.2 K, and exhibits a vapor pressure of .526 atm at 333.6 K.

Thanks so much!
ESKKEEEETTTIIITT

primitivepolonium
Member
Member
Posts: 53
Joined: August 3rd, 2013, 9:00 am
Division: Grad
State: CA
Has thanked: 0
Been thanked: 0

Re: Chemistry Lab C

Post by primitivepolonium » January 24th, 2018, 6:02 am

Nerd_bunny wrote:How is everyone studying for physical properties? Since this topic hasn't been in rotation for a while I'm having trouble finding any resources to help study.
As a test writer, I focused more on the concepts behind the physical properties than on the properties themselves. For instance, I tested the ideas behind say, why some things are denser than others or how dissolving things in water works. The only issues is that while that approach works well for like conductivity (you need to understand intermolecular forces), things like color require pulling material from organic or even undergrad level inorganic chemistry. Magnetism and solubility are also super vague. It's pretty hard to figure out how far as a test writer you're supposed to go, or what SciOly intended exactly with their rules.

The questions I attempted to avoid were memorization problems. For instance, I wouldn't put a "Order the density of these metals" thing on the exam because 1) it requires you to dedicate a not insignificant space to record information that doesn't really help you progress as a chemist and 2) it's better to test say, the reasons why some metals are denser (ie: they have a more highly packed structure).

All in all, I dislike this topic somewhat intensely. It's hard to find a physical properties lab that doesn't take over 50 minutes or require extensive equipment and preparation. I have not seen a single competition that did not do a thermo lab, and I'm sure that when I do, it will be a highly janky lab. Also, the list of properties feels super arbitrary. Why elasticity, but not hardness? Does elasticity include ductility and malleability also? This topic could have been my favorite if it were more specific, but it's way too vague.

Tl;dr: focus on causes of physical properties and understanding what those properties exactly are.
Div D! I really like chem, oceanography, and nail polish--not in that order.

Troy HS, co2016.

Feel free to PM me about SciOly or college or whatever! I really enjoy making online friends.

NothingMatters.
Member
Member
Posts: 2
Joined: November 14th, 2017, 12:29 pm
Has thanked: 0
Been thanked: 0

Re: Chemistry Lab C

Post by NothingMatters. » February 1st, 2018, 12:39 pm

This is my first year doing science Olympiad and I cannot fully understand the wiki for Chem Lab, my event is this Saturday, are there any things I should add to my sheet that people tend to forget?

geniusjohn5
Member
Member
Posts: 110
Joined: January 18th, 2017, 6:57 pm
Division: C
Has thanked: 0
Been thanked: 0

Re: Chemistry Lab C

Post by geniusjohn5 » February 17th, 2018, 12:28 pm

Are there any good resources/links to prepare for the Lab portion of this event?
The biologist speculates, "What's the meaning of life?"
The physicist asks, "In the universe, does matter really matter?"
The chemist replies, "I shall find solutions to both questions."

geniusjohn5
Member
Member
Posts: 110
Joined: January 18th, 2017, 6:57 pm
Division: C
Has thanked: 0
Been thanked: 0

Re: Chemistry Lab C

Post by geniusjohn5 » February 20th, 2018, 7:39 am

Does anyone know what reference sheets the test proctors will give to us test-takers? For example, will a Periodic Table be provided at the test?
The biologist speculates, "What's the meaning of life?"
The physicist asks, "In the universe, does matter really matter?"
The chemist replies, "I shall find solutions to both questions."

kenniky
Member
Member
Posts: 283
Joined: January 21st, 2016, 6:16 pm
Division: Grad
State: MA
Has thanked: 0
Been thanked: 0

Re: Chemistry Lab C

Post by kenniky » February 20th, 2018, 8:17 am

geniusjohn5 wrote:Does anyone know what reference sheets the test proctors will give to us test-takers? For example, will a Periodic Table be provided at the test?
Proctors are supposed to provide all constants, which would include a periodic table (or at least relevant molar masses)

Most tests I have seen do provide these, but sometimes they don't. If you have extra space on your cheat sheet, I would highly recommend adding a periodic table, a list of common enthalpies of formation and specific heats, and other important constants in case the ES doesn't read the rules carefully enough.
Automated Event Assigner!
UMich 2018: Chem Lab, Fermi

[url=http://tinyurl.com/kenniky-so-test]Rate my tests![/url]
[url]https://scioly.org/wiki/index.php/User:Kenniky[/url]

[url=https://scioly.org/forums/viewtopic.php?t=10008&start=34]2017 Nats = rip[/url]
[url=https://youtu.be/MCo8IAovjfw]ABRHS 2016[/url]

huppada
Member
Member
Posts: 47
Joined: October 27th, 2016, 6:05 pm
Division: C
State: FL
Has thanked: 2 times
Been thanked: 0

Re: Chemistry Lab C

Post by huppada » February 23rd, 2018, 7:40 pm

Chem Lab is allowed to have 5 pages for cheat sheets, but I have no idea how to fill up all the space.
Did anyone completely fill theirs, or does anyone have any ideas for what to add?
Orlando Science Schools '20
2020 Events: Disease Detectives, Forensics, Protein Modeling

kenniky
Member
Member
Posts: 283
Joined: January 21st, 2016, 6:16 pm
Division: Grad
State: MA
Has thanked: 0
Been thanked: 0

Re: Chemistry Lab C

Post by kenniky » February 23rd, 2018, 9:19 pm

huppada wrote:Chem Lab is allowed to have 5 pages for cheat sheets, but I have no idea how to fill up all the space.
Did anyone completely fill theirs, or does anyone have any ideas for what to add?
Lists of enthalpies, entropies, Gibbs energies, colors

Common constants (ex: anything to do with water)

If you can fit it onto 2 sheets you can make a copy for you and your partner.

I do agree that 5 is overkill for Chem Lab
Automated Event Assigner!
UMich 2018: Chem Lab, Fermi

[url=http://tinyurl.com/kenniky-so-test]Rate my tests![/url]
[url]https://scioly.org/wiki/index.php/User:Kenniky[/url]

[url=https://scioly.org/forums/viewtopic.php?t=10008&start=34]2017 Nats = rip[/url]
[url=https://youtu.be/MCo8IAovjfw]ABRHS 2016[/url]

User avatar
Nerd_Bunny
Member
Member
Posts: 137
Joined: January 12th, 2017, 9:36 am
Division: C
State: ID
Has thanked: 0
Been thanked: 1 time

Re: Chemistry Lab C

Post by Nerd_Bunny » February 24th, 2018, 8:41 am

kenniky wrote:
huppada wrote:Chem Lab is allowed to have 5 pages for cheat sheets, but I have no idea how to fill up all the space.
Did anyone completely fill theirs, or does anyone have any ideas for what to add?
Lists of enthalpies, entropies, Gibbs energies, colors

Common constants (ex: anything to do with water)

If you can fit it onto 2 sheets you can make a copy for you and your partner.

I do agree that 5 is overkill for Chem Lab
My partner and I are completely taking advantage of those 5 sheets. Anything we come across, we put on the sheet. We have pretty large font yet still have tons of room.We're also both doing A&P, so we know how much extra sheets can help. I'd recommend adding as many images, charts, and flowcharts as possible. We have an electron configuration chart, (two actually) a phase diagram, an electronegativity chart, and room for a full periodic table. Don't forget to put some common densities and specific heat values on there too. Event supervisors are supposed to give you these values but sometimes they don't. Really take advantage of those 5 pages.
Events: A&P, DD, Circuit Lab
States/Nats
2017 DD: 1/16
2018 A&P: 1/29
2019 A&P: 1/22
2019 PM: 1/22 
If you're curious...yes, I like rabbits.

Locked

Return to “2018 Lab Events”

Who is online

Users browsing this forum: No registered users and 1 guest