Lanthaniden en actiniden - Bewerkingsoverzicht

Simmsy16: /* Examenvragen */

2018-01-26T12:50:45Z

Examenvragen

← Oudere versie		Versie van 26 jan 2018 14:50
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	==Examenvragen==		==Examenvragen==

			===26 januari 2018===

			# What is an MRI contrast agent? What makes a good contrast agent?
			# How do you get RE oxides into the metallic state?
			# Explain the mechanism of sensitised luminescence
			# What is present in spent nuclear fuel?
			# Explain the balance problem from an economics perspective. How can recycling help?
			# Oral questions - brief discussion of written questions then feedback of the report with a few small questions


	===25 januari 2018===		===25 januari 2018===

Wim: /* 25 januari 2018 */

2018-01-25T15:26:59Z

25 januari 2018

← Oudere versie		Versie van 25 jan 2018 17:26
Regel 8:		Regel 8:

	===25 januari 2018===		===25 januari 2018===
	~~Lanthanides and actinides VM25/1:~~
	#Grondtoetanden: Gd3+, Tb3+, Yb2+ en Nd3+		#Grondtoetanden: Gd3+, Tb3+, Yb2+ en Nd3+
	#Hysteresis uitlegggen: bijvragen wat is Hc en Br en BHmax en wat betekenen die.		#Hysteresis uitlegggen: bijvragen wat is Hc en Br en BHmax en wat betekenen die.

Wim: /* Examenvragen */

2018-01-25T15:26:38Z

Examenvragen

← Oudere versie		Versie van 25 jan 2018 17:26
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	==Examenvragen==		==Examenvragen==

	===25 januari 2018		===25 januari 2018===
	Lanthanides and actinides VM25/1:		Lanthanides and actinides VM25/1:
	#Grondtoetanden: Gd3+, Tb3+, Yb2+ en Nd3+		#Grondtoetanden: Gd3+, Tb3+, Yb2+ en Nd3+

Wim: /* Examenvragen */

2018-01-25T15:26:14Z

Examenvragen

← Oudere versie		Versie van 25 jan 2018 17:26
Regel 6:		Regel 6:

	==Examenvragen==		==Examenvragen==

			===25 januari 2018
			Lanthanides and actinides VM25/1:
			#Grondtoetanden: Gd3+, Tb3+, Yb2+ en Nd3+
			#Hysteresis uitlegggen: bijvragen wat is Hc en Br en BHmax en wat betekenen die.
			#Waarom is de term rare earths misleidend? Welke RE zijn het minst abundant? Geef de trends qua abundantie binnen de lanthaniden (zowel LLn minder abundant als oneven atoommassa's). Waarom is Pm niet erg abundant.
			#Verschil f-f spectra lanthaniden met d-d spectra transitiemetalen
			#Waarom la3+, Lu3+ en Gd3+ geen emissie hebben in het zichtbaar gebied.
			#Waarom geen water in eerste coördinaatsfeer mag zitten
			#PUREX uitleggen. Bijvragen hoe Pu en U gestript worden.
			#Paper bijvragen

	===27 januari 2017===		===27 januari 2017===

Lotte: /* Binnemans */

2017-12-17T19:43:47Z

Binnemans

← Oudere versie		Versie van 17 dec 2017 21:43
Regel 53:		Regel 53:
	#Work out the ground states for Nd3+, Gd3+, Tb3+ and Yb2+.		#Work out the ground states for Nd3+, Gd3+, Tb3+ and Yb2+.
	#(a) What are MRI contrast agents?(b) What are the requirements for a good MRI contrast agent?		#(a) What are MRI contrast agents?(b) What are the requirements for a good MRI contrast agent?
	#(a) Why is the name ~~â€œrare earthsâ€~~ misleading?(b) What are the rarest elements of the rare earths? (c) What trend can be observed for the abundance of the lanthanide ions over the lanthanide series?		#(a) Why is the name "rare earth" misleading?(b) What are the rarest elements of the rare earths? (c) What trend can be observed for the abundance of the lanthanide ions over the lanthanide series?
	#(a) Why do La3+, Lu3+ and Gd3+ compounds not show visible luminescence? (b) Explain why f-f transitions in the electronic spectra of lanthanide complexes are weaker than d-d transitions in the corresponding spectra of transition metal complexes.		#(a) Why do La3+, Lu3+ and Gd3+ compounds not show visible luminescence? (b) Explain why f-f transitions in the electronic spectra of lanthanide complexes are weaker than d-d transitions in the corresponding spectra of transition metal complexes.
	#Write the equations for (i) reduction of ScF3 by calcium, (ii) scandium oxide dissolving in potassium hydroxide, (iii) the thermal decomposition of (NH4)3ScCl6. (b) Why is the thermal decomposition of (NH4)3ScCl6 a good way of making pure ScCl3?		#Write the equations for (i) reduction of ScF3 by calcium, (ii) scandium oxide dissolving in potassium hydroxide, (iii) the thermal decomposition of (NH4)3ScCl6. (b) Why is the thermal decomposition of (NH4)3ScCl6 a good way of making pure ScCl3?

Lotte: /* Binnemans */

2017-12-17T19:43:24Z

Binnemans

← Oudere versie		Versie van 17 dec 2017 21:43
Regel 41:		Regel 41:
	#Bespreek 3 manieren om de lanthaniden te plaatsen in de tabel van Mendeleev.		#Bespreek 3 manieren om de lanthaniden te plaatsen in de tabel van Mendeleev.
	#Bespreek 'sensitized luminescence' bij Ln3+-ionen.		#Bespreek 'sensitized luminescence' bij Ln3+-ionen.
	#Welke ~~stoichiometriÃ«n~~ vinden we terug bij beta-diketonaatcomplexen. Welke zijn de meest gebruikte?		#Welke stoichiometriën vinden we terug bij beta-diketonaatcomplexen. Welke zijn de meest gebruikte?

	====Van Deun====		====Van Deun====

Kwinten Janssens op 27 jan 2017 om 10:53

2017-01-27T10:53:45Z

← Oudere versie		Versie van 27 jan 2017 12:53
Regel 6:		Regel 6:

	==Examenvragen==		==Examenvragen==

			===27 januari 2017===
			# A solution of Eu(ClO4)3 in water shows a weak luminescence upon irradiation with light of a wavelength of 393 nm. Upon addition of the sodium salt of pyridine 2,6-dicarboxic acid (dipicalinic acid), a steady increase of the luminescence intensity is observed until the metal to ligand ratio is 1:3. Further addition of the ligand does not appreciably change the luminescence output. However, the luminescence becomes much stronger upon changing the excitation wavelength from 393 to 266 nm.
			# Discuss what types of stoichiometries are found for lanthanide beta-diketonate complexes and to list the most common types of beta-diketones used for complex formation with lanthanide ions
			# What is the balance problem, how is it influenced by recycling?
			# What is uranium enrichment, why and how is it used?
			# How can you form a anhydrous LnCl3 (2Ln + 3Cl2 => 2LnCl3 and thermal decomposition of LnCl3.xH2O in presence of SOCl2)
			# Small feedback on the paper, not necessary extra questions

			===26 januari 2017===
			# Stabiliteit van lanthaniden beschrijven en deze vergelijken met de actiniden
			# Bespreek het mechanisme van sensitized luminescence
			# Wat is een MRI contrast agent? Wat zijn de vereisten voor een goede MRI contrast agent?
			# Hoe krijgt ge lanthaniden in hun metallische staat en wa zijn dan de algemene eigenschappen daarvan
			# Bespreek de verschillende stappen in de nuclear fuel cyclus
			# korte bespreking van het artikel met misschien enkele kleine vraagjes

	===24 januari 2013===		===24 januari 2013===

ClerixJW: /* onbekende datum 4 */

2017-01-03T19:13:59Z

onbekende datum 4

← Oudere versie		Versie van 3 jan 2017 21:13
Regel 47:		Regel 47:
	#Explain the presence of the actinides Es and Fm in the fallout of the thermonuclear Mike test.		#Explain the presence of the actinides Es and Fm in the fallout of the thermonuclear Mike test.

	===~~onbekende datum 4~~===		===26 januari 2012 VM===
			====Binnemans====
	#Work out the ground states for Eu2+, Pm4+, Eu3+, Pr3+ and Er3+.		#Work out the ground states for Eu2+, Pm4+, Eu3+, Pr3+ and Er3+.
	#Explain why the electronic spectra of Pr3+ consist of a number of weak, sharp lines, whereas those in the spectrum of V3+ are stronger and broader and less numerous.		#Explain why the electronic spectra of Pr3+ consist of a number of weak, sharp lines, whereas those in the spectrum of V3+ are stronger and broader and less numerous.
Regel 57:		Regel 58:
	#*the reaction of Sm with 1,2-diiodoethane		#*the reaction of Sm with 1,2-diiodoethane
	#*reaction of hydrated holmiumchloride with thionylchloride</text>		#*reaction of hydrated holmiumchloride with thionylchloride</text>

			====Van Deun====
			#Discuss extraction of uranium from ores.
			#Compare the bonding in cyclopentadienyl compounds of the lanthanides and actinides with that in ferrocene.
			#How does ion exchange chromatography work and why was it so important in the discovery of the heaviest actinides?
			#Given an energy level diagram for the actinide COT compounds, fill in the right number of electrons for plutonocene and indicate whether this compound is diamagnetic or paramagnetic.

ClerixJW: /* onbekende datum 3 */

2017-01-03T19:12:29Z

onbekende datum 3

← Oudere versie		Versie van 3 jan 2017 21:12
Regel 33:		Regel 33:
	#Waarom is de fissie van U(235) asymmetrisch?		#Waarom is de fissie van U(235) asymmetrisch?

	===~~onbekende datum 3~~===		===26 januari 2012 NM===
			====Binnemans====
	#Work out the ground states for Nd3+, Gd3+, Tb3+ and Yb2+.		#Work out the ground states for Nd3+, Gd3+, Tb3+ and Yb2+.
	#(a) What are MRI contrast agents?(b) What are the requirements for a good MRI contrast agent?		#(a) What are MRI contrast agents?(b) What are the requirements for a good MRI contrast agent?
Regel 39:		Regel 40:
	#(a) Why do La3+, Lu3+ and Gd3+ compounds not show visible luminescence? (b) Explain why f-f transitions in the electronic spectra of lanthanide complexes are weaker than d-d transitions in the corresponding spectra of transition metal complexes.		#(a) Why do La3+, Lu3+ and Gd3+ compounds not show visible luminescence? (b) Explain why f-f transitions in the electronic spectra of lanthanide complexes are weaker than d-d transitions in the corresponding spectra of transition metal complexes.
	#Write the equations for (i) reduction of ScF3 by calcium, (ii) scandium oxide dissolving in potassium hydroxide, (iii) the thermal decomposition of (NH4)3ScCl6. (b) Why is the thermal decomposition of (NH4)3ScCl6 a good way of making pure ScCl3?		#Write the equations for (i) reduction of ScF3 by calcium, (ii) scandium oxide dissolving in potassium hydroxide, (iii) the thermal decomposition of (NH4)3ScCl6. (b) Why is the thermal decomposition of (NH4)3ScCl6 a good way of making pure ScCl3?

			====Van Deun====
			#A table of reduction potentials for the actinides is given. Comment on the most stable oxidation states of the actinide ions in aqueous solution.
			#Discuss the actinyl ions. Why is ThO2 not linear?
			#What is the PUREX process and why is it used?
			#Explain the presence of the actinides Es and Fm in the fallout of the thermonuclear Mike test.

	===onbekende datum 4===		===onbekende datum 4===

ClerixJW: /* Van Deun */

2017-01-03T19:10:43Z

Van Deun

← Oudere versie		Versie van 3 jan 2017 21:10
Regel 27:		Regel 27:
	#Welke stoichiometriÃ«n vinden we terug bij beta-diketonaatcomplexen. Welke zijn de meest gebruikte?		#Welke stoichiometriÃ«n vinden we terug bij beta-diketonaatcomplexen. Welke zijn de meest gebruikte?

	==Van Deun==		====Van Deun====
	#Bespreek de 2 mogelijke manieren om thorium te extraheren uit het erts.		#Bespreek de 2 mogelijke manieren om thorium te extraheren uit het erts.
	#Bespreek de oxidatietoestanden van actinieden en vergelijk met de lanthaniden.		#Bespreek de oxidatietoestanden van actinieden en vergelijk met de lanthaniden.