degassing a solution - 2023 BHSU Online

Question

Freeze-pump-thaw cycles can be used to perform this process for small volumes. For 10 points each:

[10h] Name or describe this general process, which is performed using bubbles of a chemically inert substance, such as helium, in sparging.

ANSWER: degassing a solution [accept answers describing the removal of gas or oxygen or air from a solution ]

[10e] The “pump” step of a freeze-pump-thaw cycle involves this condition, which is used along with a Büchner funnel in a filtration technique. The “ultra-high” regime of this condition is defined as a pressure below 100 nanopascals.

ANSWER: vacuum [accept ultra-high vacuum]

[10m] A series of ports with specialized stopcocks are connected to a vacuum pump and a source of inert gas in these systems for manipulating air-sensitive compounds. They're named for a German chemist.

ANSWER: Schlenk lines [accept vacuum gas manifolds]

<BB>

Back to bonuses

Summary


2023 BHSU @ Berkeley	03/18/2023	Y	3	13.33	100%	33%	0%
2023 BHSU @ Maryland	03/11/2023	Y	3	20.00	67%	67%	67%
2023 BHSU @ Northwestern	02/25/2023	Y	6	21.67	100%	67%	50%
2023 BHSU Online	04/15/2023	Y	4	15.00	75%	50%	25%
2023 BHSU @ Sheffield	04/15/2023	Y	2	15.00	100%	50%	0%
2023 BHSU @ Waterloo	04/15/2023	Y	3	10.00	100%	0%	0%
2023 BHSU @ Yale	04/08/2023	Y	3	16.67	100%	33%	33%

Data


Hutto Hippos	Rollin in from Sturgis, The Cheyne Gang	0	10	10	20
Hutto Hippos	Rollin in from Sturgis, The Cheyne Gang	0	10	10	20
Hutto Hippos	Cornell C++	0	10	10	20
Hutto Hippos	Cornell C++	0	10	10	20
Hutto Hippos	Rollin in from Sturgis, The Cheyne Gang	0	0	10	10
Hutto Hippos	Rollin in from Sturgis, The Cheyne Gang	0	0	10	10
Hutto Hippos	Cornell C++	0	0	10	10
Hutto Hippos	Cornell C++	0	0	10	10
The Enrique Trastamara Military Academy B	Cornell B-	0	10	0	10
Rollin in from Sturgis, The Cheyne Gang	What is BH! And you are asking me? BHSU	10	10	0	20