Crime Busters B

Post Reply
User avatar
bernard
Administrator
Administrator
Posts: 2498
Joined: January 5th, 2014, 3:12 pm
Division: Grad
State: WA
Pronouns: He/Him/His
Has thanked: 185 times
Been thanked: 789 times
Contact:

Crime Busters B

Post by bernard »

"One of the ways that I believe people express their appreciation to the rest of humanity is to make something wonderful and put it out there." – Steve Jobs
drcubbin
Member
Member
Posts: 231
Joined: January 9th, 2015, 6:28 pm
Division: B
State: NY
Has thanked: 123 times
Been thanked: 13 times
Contact:

Re: Crime Busters B

Post by drcubbin »

I've never ES'd Crime Busters, so can someone tell me how they grade testing "2" powders. If the team gets one of the two solids correct, is that counted as -1 (partial credit) or full credit? Or are they typically scored as an "all or nothing"?
aakoala
Member
Member
Posts: 82
Joined: April 1st, 2021, 3:00 pm
Division: C
State: MI
Pronouns: He/Him/His
Has thanked: 40 times
Been thanked: 11 times
Contact:

Re: Crime Busters B

Post by aakoala »

drcubbin wrote: December 9th, 2021, 8:20 am I've never ES'd Crime Busters, so can someone tell me how they grade testing "2" powders. If the team gets one of the two solids correct, is that counted as -1 (partial credit) or full credit? Or are they typically scored as an "all or nothing"?
It's usually each powders is worth 1 point (if out of 2 points), but it's obviously up to the event supervisor. I think it's normal to do one point per powder though. Hope this helps! :)
These users thanked the author aakoala for the post:
drcubbin (December 10th, 2021, 10:39 am)
Userpage
22-23 Events:
Cell Biology
Dynamic Planet
Forensics
Remote Sensing
drcubbin
Member
Member
Posts: 231
Joined: January 9th, 2015, 6:28 pm
Division: B
State: NY
Has thanked: 123 times
Been thanked: 13 times
Contact:

Re: Crime Busters B

Post by drcubbin »

Much appreciated :)
jhutchins095
Member
Member
Posts: 1
Joined: January 9th, 2022, 10:31 am
Division: B
State: NY
Pronouns: He/Him/His
Has thanked: 0
Been thanked: 0

Density

Post by jhutchins095 »

We have not participated in Crime Busters before. There is a reference to using density. Does this mean that the students will be expected to use lab equipment to figure out the mass and volume and then calculate the density. If so, what equipment are they given to measure mass and volume?
User avatar
jaspattack
Moderator
Moderator
Posts: 150
Joined: April 30th, 2018, 8:29 am
Division: Grad
State: MO
Has thanked: 162 times
Been thanked: 168 times
Contact:

Re: Density

Post by jaspattack »

jhutchins095 wrote: January 9th, 2022, 10:36 am We have not participated in Crime Busters before. There is a reference to using density. Does this mean that the students will be expected to use lab equipment to figure out the mass and volume and then calculate the density. If so, what equipment are they given to measure mass and volume?
Are you referring to section 2.f.iii in the rules manual? It talks about "differential density solutions or other method of determining density of polymers if plastics given". Typically when density is used in Crime Busters, it's used as a means of distinguishing two unknown plastics. Students are rarely (in my experience) expected to calculate density on their own, they use solutions of a known density to determine the density of an unknown plastic (if that makes sense).

For example, one of the unknown plastics in the event might float in water. Since it is known that both LDPE and HDPE have a lower density than water, it is likely that the unknown plastic is one of these two.
CHS '21 // Mizzou '25 | Jaspattack's Userpage

2020-21 Events: Designer Genes, Forensics, Ornithology, Protein Modeling

I edit the wiki sometimes.
roadscholar4ever
Member
Member
Posts: 3
Joined: March 17th, 2022, 9:11 am
Division: B
State: NY
Pronouns: She/Her/Hers
Has thanked: 0
Been thanked: 1 time

Re: Crime Busters B

Post by roadscholar4ever »

It says in the manual that each participant may have two cheat sheets. Must they be the same exact cheat sheet or can they be different?
These users thanked the author roadscholar4ever for the post:
drcubbin (March 26th, 2022, 3:06 pm)
aakoala
Member
Member
Posts: 82
Joined: April 1st, 2021, 3:00 pm
Division: C
State: MI
Pronouns: He/Him/His
Has thanked: 40 times
Been thanked: 11 times
Contact:

Re: Crime Busters B

Post by aakoala »

they can be different.
These users thanked the author aakoala for the post:
drcubbin (March 26th, 2022, 3:06 pm)
Userpage
22-23 Events:
Cell Biology
Dynamic Planet
Forensics
Remote Sensing
Post Reply

Return to “2022 Lab Events”

Who is online

Users browsing this forum: No registered users and 0 guests