Search found 196 matches
- December 23rd, 2022, 2:50 pm
- Forum: 2023 Question Marathons
- Topic: Chemistry Lab C
- Replies: 6
- Views: 2216
Re: Chemistry Lab C
I can answer the first two for now 1. As atomic radius goes across a period, it decreases because of the stronger pull on the electron cloud but increases across due to shielding effect or more shells. 2. Elements like Oxygen and Flourine tend to have high electronegativity because of their desire ...
- December 16th, 2022, 1:48 pm
- Forum: 2023 Question Marathons
- Topic: Chemistry Lab C
- Replies: 6
- Views: 2216
Re: Chemistry Lab C
1. What is the trend of the atomic radius in the period of a periodic table? Why is this so?
2. Briefly explain why elements like oxygen and fluorine have high electronegativity.
3. When balancing a redox reaction in an acidic solution, what do you balance H2O with?
2. Briefly explain why elements like oxygen and fluorine have high electronegativity.
3. When balancing a redox reaction in an acidic solution, what do you balance H2O with?
- December 14th, 2022, 4:05 pm
- Forum: 2023 Lab Events
- Topic: Crime Busters B
- Replies: 11
- Views: 4656
- December 14th, 2022, 12:40 pm
- Forum: 2023 Question Marathons
- Topic: Chemistry Lab C
- Replies: 6
- Views: 2216
Re: Chemistry Lab C
KingDelphinus wrote: ↑December 1st, 2022, 11:57 am What would be the properties of an atom with a really high ionization energy?
Not sure how many you’re looking for, but it has a high effective nuclear charge and its valence electrons are close to the nucleus. As a result, its atomic radius is generally small in comparison to other elements.
- September 27th, 2022, 12:10 pm
- Forum: 2023 Question Marathons
- Topic: Forensics C
- Replies: 3
- Views: 1877
Re: Forensics C
I'll start this marathon off:
1. Identify the three main components of Benedict's solution and describe each of their purposes.
2. Identify the three types of impressions.
3. Identify the natural force that is responsible for the formation of passive bloodstains.
1. Identify the three main components of Benedict's solution and describe each of their purposes.
2. Identify the three types of impressions.
3. Identify the natural force that is responsible for the formation of passive bloodstains.
- September 15th, 2022, 6:07 pm
- Forum: 2023 Lab Events
- Topic: Crime Busters B
- Replies: 11
- Views: 4656
Re: Crime Busters B
For the fibers on the test, is it specific to some tournaments on whether we have to identify animal, vegetable, and synthetic vs. each individual fiber, or does it just depend on the creators of the test? According to the rules, test writers should only be asking for whether a fiber is animal, veg...
- May 7th, 2022, 9:04 am
- Forum: 2022 Question Marathons
- Topic: Forensics C
- Replies: 11
- Views: 5373
Re: Forensics C
Alright, here’s my set of questions:
1. Explain why sodium chloride is conductive when dissolved in water.
2. What fibers from the rules list dissolve in bleach?
3. Explain the purpose of PCR in the context of a crime scene investigation.
1. Explain why sodium chloride is conductive when dissolved in water.
2. What fibers from the rules list dissolve in bleach?
3. Explain the purpose of PCR in the context of a crime scene investigation.
- April 19th, 2022, 7:39 pm
- Forum: 2022 Regionals & States
- Topic: North Carolina 2022
- Replies: 3
- Views: 3405
Re: North Carolina 2022
For anyone who has not seen these changes, the schedule for Division C of the upcoming state competition has been changed to include Mystery Architecture and It’s About Time, which both count towards the team score. The updated schedule can be viewed here: https://ncscienceolympiad.ncsu.edu/wp-conte...
- April 17th, 2022, 8:40 am
- Forum: 2022 Question Marathons
- Topic: Forensics C
- Replies: 11
- Views: 5373
Re: Forensics C
Here are my questions: 1) What bacteria is taq polymerase derived from? 2) Why do flame test emit colors. Describe in detail. 3) What fiber commonly undergoes mercerization? 1. Thermus aquaticus 2. Solids cause the flame to emit colors because the heat energy flame causes the electrons in the solid...
- February 19th, 2022, 8:17 pm
- Forum: 2022 Question Marathons
- Topic: Forensics C
- Replies: 11
- Views: 5373
Re: Forensics C
I apologize for the long wait. Here are my questions: 1. What plastic is commonly used in plexiglass? What properties of this plastic make it good for this application? 2. How does the fiber tenacity of fibers used in jeans compare to those used in leggings? How do you know? 3. A blood sample agglu...