Tentamen (uitwerkingen)

Physical Chemistry EXAM QUESTIONS & ANSWERS 100% CORRECT!

0 keer verkocht

Vak
Physical Chemistry

Instelling
Physical Chemistry

State, in terms of electrons, the meaning of the term oxidising agent. [1] - ANSWER 1. Electron acceptor State two features of the current atomic model that are not shown in the Rutherford model. [2] - ANSWER 1. Nucleus containing protons and neutrons 2. Electrons in energy levels/orbitals ...

[Meer zien]

Voorbeeld 2 van de 7 pagina's

Bekijk voorbeeld

Geupload op 30 september 2024
Aantal pagina's 7
Geschreven in 2024/2025
Type Tentamen (uitwerkingen)
Bevat Vragen en antwoorden

physical chemistry exam questions answers 100 c
physical chemistry exam stuvia
state in terms of electrons the meaning of the t
the sample of chronium is analysed in a tof mass

Instelling Physical Chemistry
Vak Physical Chemistry

Volgen

papersmaster01 Lid sinds 1 jaar 191 documenten verkocht

$14.99

Ook beschikbaar in voordeelbundel v.a. $31.27

In winkelwagen

Opslaan

100% tevredenheidsgarantie
Direct beschikbaar na je betaling
Lees online óf als PDF
Geen vaste maandelijkse kosten

Ook beschikbaar in voordeelbundel (1)

PHYSICAL CHEMISTRY EXAM BUNDLE (COMPLETE PACKAGE)

$ 140.71 $ 31.27 9 items

1. Tentamen (uitwerkingen) - Physical chemistry exam questions & answers 100% correct!
2. Tentamen (uitwerkingen) - Chemistry final short answer questions 100% correct!!
3. Tentamen (uitwerkingen) - Physical chemistry multiple choice questions & answers 100% accurate!!
4. Tentamen (uitwerkingen) - Physical chemistry questions & answers 100% correct!!
5. Tentamen (uitwerkingen) - Physical chemistry exam 100% correct!!
6. Tentamen (uitwerkingen) - Physical chemistry exam 1(100% correct)
7. Tentamen (uitwerkingen) - Chemistry short answer questions for midyear exam 100% updated!!
8. Tentamen (uitwerkingen) - Physical chemistry exam 1 equations 100% accurate!!
9. Tentamen (uitwerkingen) - Physical chemistry: atomic structure questions & answers 100% correct!!
Meer zien

Physical Chemistry EXAM QUESTIONS
& ANSWERS 100% CORRECT!
State, in terms of electrons, the meaning of the term oxidising agent. [1] - ANSWER 1. Electron
acceptor

State two features of the current atomic model that are not shown in the Rutherford model. [2] -
ANSWER 1. Nucleus containing protons and neutrons

2. Electrons in energy levels/orbitals

The sample of chronium is analysed in a TOF mass spectrometer. Give two reasons why it is
necessary to ionise the isotopes of chronium before they can be analysed in a TOF mass
spectrometer. [2] - ANSWER 1. Ions charged so will produce current

2. Ions will be accelerated by electric field

The student rinses the burette with deionised water before filling with sodium hydroxide solution.

State and explain the effect that this rinsing will have on the value of the titre. [2] - ANSWER 1. Titre
would increase/larger value

2. Because NaOH would be more dilute

Explain why it is necessary to ionise molecules when measuring their mass in a TOF mass
spectometer [2] - ANSWER 1. Ions will interact with and be accelerated by an electric field

2. Only ions will create a current when hitting the detector

Explain qualitatively why doubling the temperature has a much greater effect on rate of the reaction
than doubling the concentration of E. [3] - ANSWER 1. Reaction occurs when molecules have E>Ea

2. Doubling T causes many more molecules to have E>Ea

3. Whereas doubling E only doubles the number with this energy

Rearrange the Arrhenius equation for Ea. [1] - ANSWER 1. Ea= RT (lnA-lnK) /1000

A student completed a series of tests to determine the order of reaction in respect to iodine.

, Suggest why the 1.0cm3 portions of the reaction mixture are added to ab excess of NaHCO3 solution
[2] - ANSWER 1. The sodium hydrogencarbonate solution neutralises the acid catalyst

2. So stops the reaction

Describe how molecules are ionised using electrospray ionisation. [3] - ANSWER 1. Sample dissolved
in volatile solvent

2. Injected through positively charged needle

3. Each molecule/particle gains a proton

The first ionisation energies of the elements in period 2 change as the atomic number increases.

Explain the pattern in the first ionisation energies of the elements from lithium to neon. [6] -
ANSWER 1. Ionisation energy increases a long a period

2. Due to increase in nuclear charge, decrease in atomic radius and same number of electron shells

3. Higher electrostatic attraction between nucleus and outer electron requiring more energy to
overcome

4. Be-B deviation, B lower than Be

5. Outer electron of B in 2p orbital which is higher energy level than 2s

6. N-O deviation, O lower than N

7. Two electrons in 2p orbital need to pair, causing e-e repulsion

Suggest why the order of this reaction with respect to propanone can be ignored in this experiment.
[2] - ANSWER 1. The concentration/amount of propanone is much larger than the amount of iodine

2. Concentration of propanone is almost constant

Explain how a graph shows that the reaction is zero order with respect to iodine in the reaction
between iodine and propanone. [2] - ANSWER 1. The graph has a constant rate

2. So rate does not change as concentration of iodine changes/iodine is used up

For this reaction at 1050K the equilibrium constant, Kp= 7.62x105 Pa

For this reaction at 500K the equilibrium constant, Kp+ 3.94x104 Pa

Explain how this information can be used to deduce that the forward reaction is endothermic. [2] -
ANSWER 1. Kp is higher at higher temps/lower at lower temp

2. At higher temp more dissociation occurs/more products formed/ equilibrium shfits to right

Dit zijn jouw voordelen als je samenvattingen koopt bij Stuvia:

Bewezen kwaliteit door reviews

Studenten hebben al meer dan 850.000 samenvattingen beoordeeld. Zo weet jij zeker dat je de beste keuze maakt!

In een paar klikken geregeld

Geen gedoe — betaal gewoon eenmalig met iDeal, creditcard of je Stuvia-tegoed en je bent klaar. Geen abonnement nodig.

Direct to-the-point

Studenten maken samenvattingen voor studenten. Dat betekent: actuele inhoud waar jij écht wat aan hebt. Geen overbodige details!

Veelgestelde vragen

Wat krijg ik als ik dit document koop?

Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.

Tevredenheidsgarantie: hoe werkt dat?

Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.